PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

ASTM B121/B121M UNS-C33500 ANNEAWasher,flat

American Society for Testing and Materials Dba Astm International · NSN 5310-00-080-9253 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-080-9253 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-080-9253. Primary manufacturer part number: ASTM B121/B121M UNS-C33500 ANNEA.
Features
  • Washer,flat — FSC 5310
  • Peripheral Shape Style: ROUND
  • Surface Treatment: CADMIUM OVERALL
  • Hole Diameter: 0.188 INCHES NOMINAL IN
  • Cross-Sectional Shape Style: RECTANGULAR
  • Material: COPPER ALLOY OVERALL
  • Thickness: 0.040 INCHES NOMINAL IN
  • Overall Diameter: 0.375 INCHES NOMINAL IN
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Copper Alloy Overall construction
General Description

The Washer,flat, cataloged under National Stock Number 5310-00-080-9253, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is American Society for Testing and Materials Dba Astm International. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 11 commercial cross-references from 6 manufacturers, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5310-00-080-9253
Primary Part NumberASTM B121/B121M UNS-C33500 ANNEA
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerAmerican Society for Testing and Materials Dba Astm International
StatusCANCELLED
Peripheral Shape StyleROUND
Surface TreatmentCADMIUM OVERALL
Hole Diameter0.188 INCHES NOMINAL IN
Cross-Sectional Shape StyleRECTANGULAR
MaterialCOPPER ALLOY OVERALL
Thickness0.040 INCHES NOMINAL IN
Overall Diameter0.375 INCHES NOMINAL IN
Center Hole Shape StyleROUND
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 6
5325-00-178-6073LSN62CK INTERCHANGEABLE
Ring,retaining
Spirolox Inc
5310-00-685-240655366 INTERCHANGEABLE
Nut,plain,hexagon
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple
5306-00-903-8593240054 INTERCHANGEABLE
Bolt,square Neck
Hillman Group, Inc., the
5310-01-222-4117AMS-QQ-P-416 INTERCHANGEABLE
Washer,flat
Sae International Dba Sae International
5306-01-288-4512 INTERCHANGEABLE
Bolt,machine
5306-01-491-6106 INTERCHANGEABLE
Bolt,externally Relieved Body
Cross-Reference Index
Part NumberManufacturer
N401P8C General Electric Co Materials Information Services (USA)
AMS-QQ-P-416 Sae International Dba Sae International (USA)
ASTM B121/B121M UNS-C33500 ANNEA PRIMARY American Society for Testing and Materials Dba Astm International (USA)
N0401P00008C General Electric Co Materials Information Services (USA)
SAE-AMS-QQ-P-416A TY 2 CL 2 Sae International Dba Sae International (USA)
AMS-QQ-P-416 TY2 CL3 Society of Automotive Engineers Inc (USA)
N401P8C11 General Electric Company (USA)
N401P8C11 Lockheed Martin Corporation Div Rms (USA)
AMS-QQ-P-416 TY2 CL3 Sae International Dba Sae International (USA)
AMS-QQ-P-416 Society of Automotive Engineers Inc (USA)
SAE-AMS-QQ-P-416A TY 2 CL 2 Society of Automotive Engineers Inc (USA)
Related Parts
5325-00-178-6073INTERCHANGEABLE
RING,RETAINING
LSN62CK
5310-00-685-2406INTERCHANGEABLE
NUT,PLAIN,HEXAGON
55366
5306-00-903-8593INTERCHANGEABLE
BOLT,SQUARE NECK
240054
5310-01-222-4117INTERCHANGEABLE
WASHER,FLAT
AMS-QQ-P-416
5306-01-288-4512INTERCHANGEABLE
BOLT,MACHINE
5306-01-491-6106INTERCHANGEABLE
BOLT,EXTERNALLY RELIEVED BODY

Frequently Asked Questions

What is NSN 5310-00-080-9253?

NSN 5310-00-080-9253 is a Washer,flat, manufactured by American Society for Testing and Materials Dba Astm International, classified under FSC 5310 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5310-00-080-9253?

NSN 5310-00-080-9253 has 11 cross-referenced part numbers: N401P8C (General Electric Co Materials Information Services), AMS-QQ-P-416 (Sae International Dba Sae International), ASTM B121/B121M UNS-C33500 ANNEA (American Society for Testing and Materials Dba Astm International), N0401P00008C (General Electric Co Materials Information Services), SAE-AMS-QQ-P-416A TY 2 CL 2 (Sae International Dba Sae International) and 6 more.

What NSN replaces 5310-00-080-9253?

There are 6 known substitutes for 5310-00-080-9253: 5325-00-178-6073, 5310-00-685-2406, 5306-00-903-8593 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of ASTM B121/B121M UNS-C33500 ANNEA?

Key specifications for ASTM B121/B121M UNS-C33500 ANNEA: Peripheral Shape Style: ROUND; Surface Treatment: CADMIUM OVERALL; Hole Diameter: 0.188 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR. 8 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5310-00-080-9253 still in active supply?

NSN 5310-00-080-9253 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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