PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

A3958Washer,flat

Grimes Aerospace Company · NSN 5310-00-343-3976 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-343-3976 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-343-3976. Primary manufacturer part number: A3958.
Features
  • Washer,flat — FSC 5310
  • Hole Diameter: 0.097 INCHES MINIMUM AND 0.102 INCHES MAXIMUM IN
  • Cross-Sectional Shape Style: RECTANGULAR
  • Material Document and Classification: MIL-B-16261 GRADE 2 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
  • Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
  • Material: COPPER ALLOY OVERALL
  • Center Hole Shape Style: ROUND
  • Surface Treatment: CADMIUM OVERALL
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 5310-00-343-3976, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Grimes Aerospace Company. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5310-00-343-3976
Primary Part NumberA3958
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerGrimes Aerospace Company
StatusCANCELLED
Hole Diameter0.097 INCHES MINIMUM AND 0.102 INCHES MAXIMUM IN
Cross-Sectional Shape StyleRECTANGULAR
Material Document and ClassificationMIL-B-16261 GRADE 2 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
Surface Treatment Document and ClassificationQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MaterialCOPPER ALLOY OVERALL
Center Hole Shape StyleROUND
Surface TreatmentCADMIUM OVERALL
Thickness0.020 INCHES NOMINAL IN
Overall Diameter0.250 INCHES NOMINAL IN
Peripheral Shape StyleROUND
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5995-00-228-4274CX-464/UP4FT INTERCHANGEABLE
Cable Assembly,telephone
Joint Electronics Type Designation System
4730-00-263-4983169X6 INTERCHANGEABLE
Elbow,pipe to Tube
Danfoss Power Solutions II, Llc
5360-00-353-3019FC6785 INTERCHANGEABLE
Spring,helical,extension
Federal Mogul Corp Sub Wagner Brake Moog Automotive Div
5310-00-737-56777375677 INTERCHANGEABLE
Washer,lock
U S Army Tank Automotive Command Amsta-Im-Mm
6685-00-816-44906901-723 INTERCHANGEABLE
Gage,pressure,dial Indicating
Meggitt Safety Systems Inc
6625-01-092-1198260-8 INTERCHANGEABLE
Multimeter
Simpson Electric Company, Inc.
2540-01-179-996412182 INTERCHANGEABLE
Mirror Assembly,rearview
Grote Industries Inc Dba Grote Manufacturing Co Div Military Products
5963-01-231-84525829110 INTERCHANGEABLE
Electronic Module,standardized
Naval Sea Systems Command
5935-01-300-7809121-8-2 INTERCHANGEABLE
Shell,electrical Connector
Allard Nazarian Group, Inc. Dba Granite State Manufacturing
5340-01-559-5881 INTERCHANGEABLE
Plate,mounting
Cross-Reference Index
Part NumberManufacturer
A3958 PRIMARY Grimes Aerospace Company (USA)
12182 Aerosonic Llc (USA)
Related Parts
5995-00-228-4274INTERCHANGEABLE
CABLE ASSEMBLY,TELEPHONE
CX-464/UP4FT
4730-00-263-4983INTERCHANGEABLE
ELBOW,PIPE TO TUBE
169X6
5360-00-353-3019INTERCHANGEABLE
SPRING,HELICAL,EXTENSION
FC6785
5310-00-737-5677INTERCHANGEABLE
WASHER,LOCK
7375677
6685-00-816-4490INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
6901-723
6625-01-092-1198INTERCHANGEABLE
MULTIMETER
260-8
2540-01-179-9964INTERCHANGEABLE
MIRROR ASSEMBLY,REARVIEW
12182
5963-01-231-8452INTERCHANGEABLE
ELECTRONIC MODULE,STANDARDIZED
5829110
5935-01-300-7809INTERCHANGEABLE
SHELL,ELECTRICAL CONNECTOR
121-8-2
5340-01-559-5881INTERCHANGEABLE
PLATE,MOUNTING
4730-01-668-0626INTERCHANGEABLE
SHAFT HANGER ASSEMBLY
12182-503
4730-01-668-1358INTERCHANGEABLE
SHAFT HANGER ASSEMBLY
12182-510

Frequently Asked Questions

What is NSN 5310-00-343-3976?

NSN 5310-00-343-3976 is a Washer,flat, manufactured by Grimes Aerospace Company, classified under FSC 5310 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5310-00-343-3976?

NSN 5310-00-343-3976 has 2 cross-referenced part numbers: A3958 (Grimes Aerospace Company), 12182 (Aerosonic Llc).

What NSN replaces 5310-00-343-3976?

There are 12 known substitutes for 5310-00-343-3976: 5995-00-228-4274, 4730-00-263-4983, 5360-00-353-3019 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of A3958?

Key specifications for A3958: Hole Diameter: 0.097 INCHES MINIMUM AND 0.102 INCHES MAXIMUM IN; Cross-Sectional Shape Style: RECTANGULAR; Material Document and Classification: MIL-B-16261 GRADE 2 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 10 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5310-00-343-3976 still in active supply?

NSN 5310-00-343-3976 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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