MKRU5199 Antenna InstaScan Scanner, Model U519

INSTASCAN © SCANNER MODEL U519 Operations Manual SCS Corporation 10905 Technology Place, San Diego, CA 92127 Phone: 858-485-9196 • Fax: 858-485-0561 www.scs-corp.com • [email protected] U519 Manual cover.p6510/27/2000, 4:36 PM1 The products and programs described in this Operations Manual are licensed products of SCS. This Operations Manual contains proprietary information protected by copyright and this Operations Manual and all accompanying hardware, software, and documentation are copyrighted. SCS does not warrant that the hardware will work properly in all environments and applications, and makes no warranty and representation, either implied or expressed, with respect to the quality, performance, or fitness for a particular purpose. Information in this Operations Manual is subject to change without notice and does not represent a commitment on the part of SCS. SCS assumes no responsibility for incidental damage that may result do to any inaccuracies that may be contained in this Operations Manual. SCS makes no commitment to update or keep current the information in this Operations Manual, and reserves the right to make changes to this Operations Manual and/or product without notice. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or information storage and retrieval systems, for any purpose other than the purchaser’s personal use, without the express written permission of SCS. IBM is a registered trademark of International Business Machines Corporation. MS-DOS and Windows are registered trademarks of Microsoft Corporation. All other trademarks or registered trademarks listed belong to their respective owners. InstaScan and Dura-label are trademarks of SCS Corporation. Version 100612-1 Rev. A ©Copyright 2000 SCS 10905 Technology Place San Diego, CA 92127 ii U519 Manual cover.p6510/27/2000, 4:36 PM2 iii Contents Chapter 1— Introduction..............................................1 Advantages..................................................................2 U519 InstaScan Scanner...............................................4 What Else You Need.....................................................5 Summary of Chapters....................................................6 Chapter 2 — Installation..............................................7 LEDs and Connectors....................................................7 Front Panel..................................................................8 Rear Panel.................................................................10 InstaScan Scanner Installation Steps..............................11 Connecting External Antennas......................................12 Placing the Antennas...................................................12 Connecting to a PC Serial Port or RS-232......................13 Connecting to an AC Outlet.........................................14 Configuring the Scanner..............................................15 Aligning the Scanner...................................................18 Installing Dura-labels..................................................19 Reading Information from your Dura-labels....................20 Writing information to your Dura-label...........................21 Loading Your Application.............................................22 Chapter 3 — RF Communications.................................23 Signal Interference......................................................24 Signal Attenuation/Reflections......................................25 Optimizing Performance..............................................26 U519 Manual cover.p6510/27/2000, 4:36 PM3 iv Chapter 4 — Troubleshooting......................................27 Solving Problems........................................................27 Contacting Customer Service.......................................30 Returning Your System.................................................31 Chapter 5 — Specifications.........................................32 SCS Patents................................................................32 InstaScan Scanner Specifications..................................33 Chapter 6 — DB-25 Connector Function.........................35 Receive Antenna Select Lines........................................36 Transmit Antenna Select Lines.......................................37 Peripheral Inputs.........................................................37 Peripheral Outputs......................................................38 Limited Warranty.........................................................41 FCC Part 90 Compliance............................................41 Radio Frequency exposure limits...................................42 Disclaimer.................................................................42 U519 Manual cover.p6510/27/2000, 4:36 PM4 1 Chapter 1 Introduction T he U519 InstaScan scanner and the Dura-label Radio Frequency (RF) tag developed by SCS are state-of-the-art data gathering and inspection systems that combine sophisticated Interactive Identification technology in a compact form factor. This unique synergy allows our system to integrate seamlessly into — and significantly increase productivity for — a wide range of applications and environments. This system consists of the following components: A scanner that is capable of writing information to and reading information from Dura-labels using a read/write head (antenna). The scanner conforms to FCC Part 15 specifications and can operate with one to nine externally connected antennas. Dura-label RF tags that contain information programmed by the scanner. These tags are designed to store information under extremely harsh environments without requiring a battery, and the read/write Dura-labels can store a permanent record of multiple events and transactions. Communications between the scanner and the tags are conducted using a revolutionary two-way techn…

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1 Chapter 1 Introduction T he U519 InstaScan scanner and the Dura-label Radio Frequency (RF) tag developed by SCS are state-of-the-art data gathering and inspection systems that combine sophisticated Interactive Identification technology in a compact form factor. This unique synergy allows our system to integrate seamlessly into — and significantly increase productivity for — a wide range of applications and environments. This system consists of the following components: A scanner that is capable of writing information to and reading information from Dura-labels using a read/write head (antenna). The scanner conforms to FCC Part 15 specifications and can operate with one to nine externally connected antennas. Dura-label RF tags that contain information programmed by the scanner. These tags are designed to store information under extremely harsh environments without requiring a battery, and the read/write Dura-labels can store a permanent record of multiple events and transactions. Communications between the scanner and the tags are conducted using a revolutionary two-way technology that provides superior advantages over conventional communication methods. The specific data being communicated, and the amount of interaction you have with the scanner and tag, are determined by your application. U519 Manual.p651/19/2001, 3:33 PM1 2 Advantages Data-gathering systems such as bar code readers use one-way communication: a sensor reads information from a device, without any interaction between the two devices. Moreover, bar code systems are subject to line-of-sight limitations. As a result, airborne contaminants such as dust, dirt, oil, and mist, as well as label damage and objects residing outside the line of sight, result in inefficient and erroneous results. The SCS Interactive Identification System overcomes these restrictions by using state-of-the-art technology. This technology allows the scanner and tag to conduct ongoing two-way communications that are not restricted by line-of-sight constraints. Figure 1. Interactive Identification Technology U519 Manual.p651/19/2001, 3:33 PM2 3 This unique capability allows: • Collective or selective data to be read from a single tag. • Collective or selective data to be read from multiple tags without requiring sorting or unpacking. • Classes of tags to be filtered according to user-defined criteria. This technology employs a superior interrogation feature that enables applications to uniquely identify all tags in the scan field, without misidentification or identifying the same tag multiple times. It also uses a robust protocol that maintains a uniform per-tag scan time, regardless of the number of tags in the scan field. The protocol provides a flexible software application interface that can be customized to the specific needs of particular industries and markets. These unparalleled capabilities make our system an ideal solution for logistics and warehousing, automatic sortation, pallet tracking, and anti- diversion/anti-counterfeiting applications. U519 Manual.p651/19/2001, 3:33 PM3 4 U519 InstaScan Scanner The U519 scanner is designed for applications or configurations that require the scanner to be a considerable distance from the tags, or where numerous tags are required to be read simultaneously. The scanner provides nine coaxial connectors for supporting up to nine external antennas. Each antenna plugs into its own connector on the rear panel of the scanner. Figure 2. U519 InstaScan Scanner U519 Manual.p651/19/2001, 3:33 PM4 5 What Else You Need To complete your system, you need an IBM or compatible personal computer with the following minimum system requirements: •486 processor or better •Compatible screen and keyboard •9-pin RS-232 port •Windows 95 or 98 • 16 MB of RAM (32+ MB recommended) The applications you use to interface with this system may have additional hardware and software requirements. For more information, consult the manual that came with your applications. U519 Manual.p651/19/2001, 3:33 PM5 6 Summary of Chapters Besides Chapter 1, this Operations Manual contains the following additional chapters: • Chapter 2, Installation – describes how to install the scanner and tag(s) • Chapter 3, RF Communication - provides information on radio frequency (RF) communications • Chapter 4, Troubleshooting – describes how to identify, resolve, and avoid problems when using the scanner and tag. This chapter also contains Customer Service information and merchandise return instructions • Chapter 5, Specifications – lists scanner specifications • Chapter 6, DB-25 Connector Function — describes the 25-pin connector of the U519 scanner. U519 Manual.p651/19/2001, 3:33 PM6 7 Chapter 2 Installation T his chapter provides instructions for installing the U519 scanner and tag(s). IBefore installing the U519 Scanner and antennas, the operator should be familiar with the RF exposure precautions as outlined in the RF Exposure guidelines on page 41 of this manual. LEDs and Connectors The scanner provides the connectors and LEDs described in the following sections and shown in Figure 3. Figure 3. U519 InstaScan Scanner U519 Manual.p651/19/2001, 3:33 PM7 8 Front Panel The scanner front panel has three LEDs (as shown in Figure 4) indicating power, activity, and transmitter ON/OFF (see Table 1 which describe the meanings of the LEDs). The scanner front panel has an On/Off switch. In the ON (up) position, the scanner is turned on. The red Power ON LED should go ON, indicating that the scanner is receiving power. In the OFF (down) position, the scanner is turned off and not receiving power, even if connected to a power outlet. The front panel also contains three connectors. The lower connector is a DC power receptacle. For more information, refer to “Connecting to a DC Source” on page 14. The middle connector is the 9-pin RS-232 port. The RS-232 serial port connector allows the scanner to communicate with a personal computer Figure 4. U519 InstaScan Scanner U519 …

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INSTASCAN © SCANNER MODEL U519 Operations Manual SCS Corporation 10905 Technology Place, San Diego, CA 92127 Phone: 858-485-9196 • Fax: 858-485-0561 www.scs-corp.com • [email protected] U519 Manual cover.p652/22/2001, 2:44 PM1 The products and programs described in this Operations Manual are licensed products of SCS. This Operations Manual contains proprietary information protected by copyright and this Operations Manual and all accompanying hardware, software, and documentation are copyrighted. SCS does not warrant that the hardware will work properly in all environments and applications, and makes no warranty and representation, either implied or expressed, with respect to the quality, performance, or fitness for a particular purpose. Information in this Operations Manual is subject to change without notice and does not represent a commitment on the part of SCS. SCS assumes no responsibility for incidental damage that may result do to any inaccuracies that may be contained in this Operations Manual. SCS makes no commitment to update or keep current the information in this Operations Manual, and reserves the right to make changes to this Operations Manual and/or product without notice. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or information storage and retrieval systems, for any purpose other than the purchaser’s personal use, without the express written permission of SCS. IBM is a registered trademark of International Business Machines Corporation. MS-DOS and Windows are registered trademarks of Microsoft Corporation. All other trademarks or registered trademarks listed belong to their respective owners. InstaScan and Dura-label are trademarks of SCS Corporation. Version 100612-1 Rev. A ©Copyright 2000 SCS 10905 Technology Place San Diego, CA 92127 ii U519 Manual cover.p652/22/2001, 2:44 PM2 iii Contents Chapter 1— Introduction.......................................................1 Advantages....................................................................2 U519 InstaScan ® Scanner................................................4 What Else You Need........................................................5 Summary of Chapters......................................................6 Chapter 2 — Installation.......................................................7 LEDs and Connectors......................................................7 Front Panel.....................................................................8 Rear Panel....................................................................10 Scanner Installation Steps..............................................11 Connecting External Antennas........................................12 Placing the Antennas.....................................................12 Connecting to a PC Serial Port or RS-232.......................13 Connecting to a DC Source...........................................14 Testing the Scanner Setup...............................................15 Aligning the Scanner.....................................................18 Installing Dura-labels ® ...................................................19 Reading Information from your Dura-labels ® ....................20 Writing information to your Dura-label ® ..........................21 Loading Your Application...............................................22 Chapter 3 — RF Communications........................................23 Signal Interference........................................................24 Signal Attenuation/Reflections........................................25 Optimizing Performance................................................26 U519 Manual cover.p652/22/2001, 2:44 PM3 iv Chapter 4 — Troubleshooting..............................................27 Solving Problems...........................................................27 Contacting Customer Service.........................................30 Returning Your System....................................................31 Chapter 5 — Specifications.................................................32 SCS Patents..................................................................32 U519 Scanner Specifications.........................................33 Chapter 6 — DB-25 Connector Function...............................35 Receive Antenna Select Lines..........................................36 Transmit Antenna Select Lines.........................................37 Peripheral Inputs...........................................................37 Peripheral Outputs........................................................38 Limited Warranty...........................................................40 FCC Part 15 Compliance...............................................40 Radio Frequency exposure..............................................41 Disclaimer....................................................................41 U519 Manual cover.p652/22/2001, 4:16 PM4 1 Chapter 1 Introduction T he U519 InstaScan scanner and the Dura-label Radio Frequency (RF) tag developed by SCS are state-of-the-art data gathering and inspection systems that combine sophisticated Interactive Identification technology in a compact form factor. This unique synergy allows our system to integrate seamlessly into — and significantly increase productivity for — a wide range of applications and environments. This system consists of the following components: A scanner that is capable of writing information to and reading information from Dura-labels using a read/write head (antenna). The scanner conforms to FCC Part 15 specifications and can operate with one to nine externally connected antennas. Dura-label RF tags that contain information programmed by the scanner. These tags are designed to store information under extremely harsh environments without requiring a battery, and the read/write Dura-labels can store a permanent record of mult…

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Report No. 0414-08 (FCC ID: MKRU519) Page 1 Rev.No 1.0 ATTESTATION STATEMENT All tests according to FCC Part 15, Paragraphs 15.209(b); 15.247(a)(i); (a)(1); (b)(2) were n - Performed o - Not Performed The Equipment Under Test n - Fulfills the requirements of FCC Part 15, Paragraphs 15.209(b); 15.247(a)(i); (a)(1); (b)(2). o - Does not fulfill the general approval requirements cited on page 1. - TÜV PRODUCT SERVICE, INC. - Responsible Engineer: Jim Owen (EMC Engineer)

Single Chip Systems Corporation Phase Locked Loop 903-927.5 MHz RF Amp/Sw. 903-927.5 MHz Power Amp 903-927.5 MHz Voltage Rectifier and Antenna Backscatter Switch (Baseband) Quadrature Downconverter Amplify/Filter/Detect (Baseband) Digital Circuitry Tag Transmits Data Using Antenna Reader Transmits Data by Keying Off MODEL MKR U519 SCANNER TAG 20MHz Clock Microprocessor Amplify 903-927.5 MHz Hopping Channel Assignment Sync & Data from Micro RS232 Interface Circulator 3 dB Coupler 903-927.5 MHz LO Signal Transmit Filter SP9T SWITCH 903-927.5 MHz POWER SUPPLY CONTROL ANTENNA Filter

TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone 619 546 3999 FAX 619 546 0364 TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone 619 546 3999 FAX 619 546 0364 28 September 2000 Chief, Equipment Approval Services P. O. Box 358315 Pittsburgh, PA 15251-5315 RE:FCC ID: MKRU519 Confirmation #: EA 99257 Dear Sir/Madam: The Equipment Code was incorrectly stated as DXX for the above application. The code should be DSS. If this letter is not sufficient, please advise. Sincerely, Judy Evans Technical Writer

MKRU519 FCC Label MKRU519 FCC Label Location This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: 1) This device must not cause harmful interference and 2) This device must accept any interference received. Country of Origin USA Patents Pending Serial No. Serial No. UU55191900010001 FCC ID: MKRU519 SCS Corporation 10905 Technology Pl. San Diego, CA 92127 858.485.9196

Single Chip Systems Corporation MODEL MKR U519 SCANNER Functional Description Purpose: This device is intended for applications in the areas of identification, verification, and inventory control. The system consists of two main parts, a reader and ID tags. The reader is operated by the user to interrogate the tags which are attached to objects in the field. Tags are small in size and have read/write capability. Theory of Operation: The ID tags derive their power from the RF energy of the reader signal, and are not internally powered. Signaling from reader to tag is accomplished by momentarily switching off the RF transmitter in a predetermined pattern. Signaling from tag to reader is accomplished though antenna backscatter. The tag momentarily shorts its antenna terminals together, which causes the transmitted power that was being absorbed into the tag to reflect back off its antenna. This reflected signal sensed by the receiver. Transmitter: The transmitter produces a phase locked CW signal, which is modulated by momentarily switching off the output power. In the transmitter, the phase locked loop output is amplified and then modulated by an RF switch which is also controlled by the microprocessor. It then passes through the final amplifier, low pass filter, SP9T switch, and ultimately is transmitted from the antenna. Receiver: The received signal from the antenna, comes through the SP9T switch, through a circulator, to a power divider. The two signals from the power divider are quadrature downconverted (to baseband) using an LO derived from the transmitter. The two baseband signals are amplified and filtered, the absolute values are taken, and the two resultant signals are summed. This composite baseband signal goes to a comparitor circuit which provides an input signal to the microprocessor. Antenna: The model MKR U519 scanner can use up to 9 transmit/receive antennas. Power: Antenna port power is less than 28.5 dBm. With an antenna gain of 7.5 dBi, the effective radiated output power is rated at less than 36 dBm (4 Watts). Modulated Signal Bandwidth: The 20 dB bandwidth of the modulated signal power is less than 500 KHz. Frequency Hopping Configuration: There are 50 hopping channels with center frequencies located at 0.5 MHz intervals starting at 903 MHz and continuing to 927.5 MHz. The hopping dwell time is 300msec. The frequencies - numbered 1 through 50 - are chosen pseudorandomly. The frequency number is modulo 50 of the contents of a 7 bit maximum length feedback shift register. Equal use of all channels §15.247 (a)(1): The linear feedback shift register (counter) operates continuously as soon as power is switched on. However, power is not applied to the final amplifier (to begin transmitting) until a command is received by the scanner from the operator via the host computer. The starting frequency (time) at which the transmit command occurs will generally be uniformly distributed across the 50 channels. The shift register (counter) continues to operate which should guarantee a uniform distribution of restart frequencies.

MKRU519 FREQUENCY HOPPING AND MODULATION The MKRU519 scanner uses frequency hopping as a method of meeting the FCC requirement for spread spectrum operation. The frequency hopping is completely independent of the modulation used to communicate with the RF ID labels. Both functions are described below. Frequency Hopping The RF frequency is generated using a phase locked loop (PLL) and a voltage controlled oscillator (VCO). At power up the microprocessor begins sending the PLL integrated circuit (National Semiconductor’s LMX2325TM) the serial information to the set frequency. The PLL uses a 20 MHz crystal oscillator as a reference frequency. The PLL generates a voltage for the voltage controlled oscillator (VCO). The VCO generates the RF signal, which is then fed back to the PLL. The PLL divides this signal down, and compares it to the 20 MHz reference. In the closed control loop, the PLL’s output voltage is adjusted to precisely maintain the set frequency. The frequency hopping timing is maintained by the microprocessor in the MKRU519. When it is time to hop, the microprocessor sends serial data to the PLL to change the frequency. There are 50 hopping channels with center frequencies located at 0.5 MHz intervals starting at 903 MHz and continuing to 927.5 MHz. The hopping dwell time is 300msec. The frequencies - numbered 1 through 50 - are chosen pseudorandomly. The frequency number is modulo 50 of the contents of a 7 bit maximum length feedback shift register. The linear feedback shift register (counter) operates continuously as soon as power is switched on. However, power is not applied to the final amplifier (to begin transmitting) until a command is received by the scanner from the operator via the host computer. The time at which the transmit command occurs will generally be uniformly distributed across the 50 channels. The shift register (counter) continues to operate which should guarantee a uniform distribution of restart frequencies. Modulation The MKRU519 Transceiver uses an RF on/off modulation scheme. The RF signal powers the ID tag in the field, and then communicates with the tag by briefly turning off the RF power at the proper time. The waveform timing and duty cycle depend on the transmitted symbol. There are 3 transmitter waveforms. The transceiver is either sending just a clock, sending a logic “0”, or sending a logic “1”. Figure 1 shows the timing for each of these waveforms. The range of time for the next frame of data or clock varies as a function of the interrupt latency of the microprocessor. The modulation either has the RF at full strength in the “on” state, or attenuated by at least 20 dB in the “off” state. Any time the scanner is normally operating, the RF signal is continuously being modulated. The commands being sent and the frequency of these commands is user dependant. The system is operating unmodulated only when the transceiver is instructed to operate as such, via operator command. Even when not modulated, the scanner is still frequency hopping at 300 ms intervals. The sequence of clock, logic “0” and logic “1” information being transmitted is completely dependent on the commands issued by the processor, and by the tag responses. The modulation of the signal is controlled with a digital pulse sequence from the FPGA. This signal is RC filtered to limit the transmission bandwidth, and then is sent to the analog gain control of an RF amplifier. The RF amplifier attenuates the RF signal by a minimum of 20 dB when in the “off” state. RF RF OFF (Down 26 dB) 40-55 us 2 us 2 us 1.4 RF 40-55 us 2 us 2 us 1.4 2 1.4 LOGIC “0” TRANSMITTED LOGIC “1” TRANSMITTED RF RF OFF (Down 26 dB) 25-35 us 2 us CLOCK ONLY RF RF OFF (Down 26 dB) 25-35 us 2 us 2 us 1.4 us us RF RF OFF (Down 26 dB) 25-35 us us 2 us 2 us 1.4 us 2 us 1.4 us LOGIC “0” TRANSMITTED LOGIC “1” TRANSMITTED Figure 1. Modulation Modes of the MKRU519 Transceiver

Name: Model U519 ScannerNumber: 100495-1 SCS CORPORATION Revision: A Revision Date:Aug./29/2000 ITEM QTY REF. DES. DESCRIPTION SIMPLE SCS P/N MANUFACTURE R PART NO. UNIT EXTENDED DISTRIBUTO DIST. PART NO. NO. SCS Dwg # DESCRIPTION COST COST 0 NEXT U519 Scanner System UHF System SCS 1 1 Model U511 Scanner U511 100504-1 SCS 100504-1 $369.82 $369.82 2 1 100471-1 Model U519 Housing Top Housing Top 100574-1 Krewson 100574-1 $20.00 $20.00 3 1 100472-1 Model U519 Housing Bottom Housing Bottom 100575-1 Krewson 100575-1 $43.27 $43.27 4 1 100500-1 U519 Main Wiring Harness Main Harness 100499-1 TBD 100499-1 $31.55 $31.55 Price based on parts only 5 1 100501-1 U519 Wiring Harness, 25 pin M-F 25 pin M-F Harn e 100505-1 TBD 100505-1 $21.18 $21.18 Price based on parts only 6 1 100502-1 U519 Wiring Harness, Power Power Wire Harn e 100509-1 TBD 100509-1 $2.82 $2.82 Price based on parts only 7 1 100522-1 Circuit Board Assembly, SP9T Switch SP9T Switch 100516-1 SCS 100516-1 $140.17 $140.17 8 1 100530-1 Circuit Board Assembly, DC-DC Converter Power Supply 100524-1 SCS 100524-1 $36.08 $36.08 9 2 100523-1 Mounting Bracket, SP9T Switch Mount Bracket 100517-1 Krewson 100517-1 $4.25 $8.50 10 1 Label, FCC Label 100503-1 SCS 100503-1 $1.00 $1.00 11 1 Low Pass Filter Filter F3 K&L Microwave 4l120-1000/T1720-0/0 $86.00 $86.00 L&M 12 1 Cable Assembly, SMA, 4" Cable M1 QMI 1-3636-601-5204 $14.50 $14.50 Richardson 13 1 Cable Assembly, Right Angle SMA, 3" Cable M19 QMI 1-3737-601-3203 $28.26 $28.26 Richardson 14 1 Rocker Switch, DPDT Switch SW7 C&K Components DM61J12S205PQ $3.44 $3.44 Digikey CKC2018-ND 15 1 LED, Green, Leaded LED D6 Lumex SSL-LX5093LGD $0.12 $0.12 Digi-Key 67-1108-ND 16 1 LED, Red, Leaded LED D5 Lumex SSL-LX5093LID $0.12 $0.12 Digi-Key 67-1110-ND 17 1 LED, Yellow, Leaded LED D7 Lumex SSL-LX5093LYD $0.12 $0.12 Digi-Key 67-1111-ND 18 1 Fuse Holder Fuse Holder M77 Bussmann HTB-24I $2.21 $2.21 Digi-Key 283-2345-ND 19 1 Fuse, 3A Fuse M78 Littelfuse 312 003 $0.19 $0.19 Digi-Key F121-ND 20 2 Screw, machine thread 4-40 x 5/8", pan head, Phillips, SS Screw HW60 $0.02 $0.04 Pellmell 21 4 Flat Washer, #4 SS Washer HW11 $0.03 $0.12 Pellmell 22 6 Screw, machine thread 4-40 x 1/4", pan head, Phillips, SS Screw HW8 $0.02 $0.12 Pellmell 23 2 Jack screw set, 4-40 x 3/4", female lock Jack Screw HW9 AMP 207719-1 $0.77 $1.54 Digikey A9007-ND 24 10 Lock washer, split ring, #4, SS Lock Washer HW10 $0.01 $0.10 Pellmell 25 4 Nut, hex, machine thread 4-40, 1/4" span, SS Nut HW12 $0.02 $0.08 Pellmell 26 4 Screw, machine thread 4-40 x 3/8", pan head, Phillips, SS Screw HW13 $0.50 $2.00 Pellmell 27 9 Lock washer, 1/4" star, gold plated Lock Washer HW14 $0.02 $0.18 Pellmell 29 9 Nut, hex, machine thread 1/4-36, 5/16" span, gold plated Nut HW15 $0.02 $0.18 Pellmell 30 2 Screw, machine thread 6-32 x 1/4", pan head, Phillips, SS Screw HW3 $0.02 $0.04 30 2 Lock washer, split ring, #6, SS Lock Washer HW5 $0.02 $0.04 31 26 Screw, mach. thr. 4-40 x 1/4", pan head, Phillips, th…

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