PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

121-540Washer,flat

Cmc Electronics Inc · NSN 5310-00-815-2167 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-815-2167 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-815-2167. Primary manufacturer part number: 121-540.
Features
  • Washer,flat — FSC 5310
  • Thickness: 0.022 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN
  • Material: COPPER ALLOY 268 OVERALL
  • Material Document and Classification: QQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
  • Surface Treatment: CADMIUM OVERALL
  • Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
  • Hole Diameter: 0.115 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
  • Peripheral Shape Style: ROUND
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Copper Alloy 268 Overall construction
General Description

The Washer,flat, cataloged under National Stock Number 5310-00-815-2167, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Cmc Electronics Inc. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5310-00-815-2167
Primary Part Number121-540
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerCmc Electronics Inc
StatusCANCELLED
Thickness0.022 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN
MaterialCOPPER ALLOY 268 OVERALL
Material Document and ClassificationQQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Surface TreatmentCADMIUM OVERALL
Surface Treatment Document and ClassificationQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Hole Diameter0.115 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
Peripheral Shape StyleROUND
Overall Diameter0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN
Center Hole Shape StyleROUND
Cross-Sectional Shape StyleRECTANGULAR
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 3
5305-00-206-7876 INTERCHANGEABLE
Screw,machine
5930-00-761-6781393S21P INTERCHANGEABLE
Switch,rotary
Electro Switch Corp. Dba Oak Grisgsby Div Electroswitch
4820-01-442-8535121540 INTERCHANGEABLE
Piston,valve
Aerco International, Inc. Dba Aerco International Inc
Cross-Reference Index
Part NumberManufacturer
121-540 PRIMARY Cmc Electronics Inc (CAN)
10034398-3 PRIMARY Us Army Aviation and Missile Command (USA)
AYLZ42-3 Ge Aviation Systems Llc Dba Ge Aviation Systems Llc (USA)
Related Parts
5305-00-206-7876INTERCHANGEABLE
SCREW,MACHINE
5930-00-761-6781INTERCHANGEABLE
SWITCH,ROTARY
393S21P
4820-01-442-8535INTERCHANGEABLE
PISTON,VALVE
121540

Frequently Asked Questions

What is NSN 5310-00-815-2167?

NSN 5310-00-815-2167 is a Washer,flat, manufactured by Cmc Electronics Inc, classified under FSC 5310 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5310-00-815-2167?

NSN 5310-00-815-2167 has 3 cross-referenced part numbers: 121-540 (Cmc Electronics Inc), 10034398-3 (Us Army Aviation and Missile Command), AYLZ42-3 (Ge Aviation Systems Llc Dba Ge Aviation Systems Llc).

What NSN replaces 5310-00-815-2167?

There are 3 known substitutes for 5310-00-815-2167: 5305-00-206-7876, 5930-00-761-6781, 4820-01-442-8535. Verify interchangeability with system specifications before substitution.

What are the specifications of 121-540?

Key specifications for 121-540: Thickness: 0.022 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN; Material: COPPER ALLOY 268 OVERALL; Material Document and Classification: QQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Surface Treatment: CADMIUM OVERALL. 10 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5310-00-815-2167 still in active supply?

NSN 5310-00-815-2167 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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