PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

99121Washer,flat

Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp · NSN 5310-00-785-1036 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-785-1036 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-785-1036. Primary manufacturer part number: 99121.
Features
  • Washer,flat — FSC 5310
  • Thickness: 0.093 INCHES NOMINAL IN
  • Hole Diameter: 0.390 INCHES NOMINAL IN
  • Material: PLASTIC OVERALL
  • Cross-Sectional Shape Style: RECTANGULAR
  • Overall Diameter: 0.531 INCHES NOMINAL IN
  • Center Hole Shape Style: ROUND
  • Peripheral Shape Style: ROUND
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Plastic Overall construction
General Description

The Washer,flat, cataloged under National Stock Number 5310-00-785-1036, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 5 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
NSN5310-00-785-1036
Primary Part Number99121
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerWestinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp
StatusCANCELLED
Thickness0.093 INCHES NOMINAL IN
Hole Diameter0.390 INCHES NOMINAL IN
MaterialPLASTIC OVERALL
Cross-Sectional Shape StyleRECTANGULAR
Overall Diameter0.531 INCHES NOMINAL IN
Center Hole Shape StyleROUND
Peripheral Shape StyleROUND
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 6
5950-00-193-8512647747 INTERCHANGEABLE
Transformer,power
Lockheed Martin Corporation Div Rms - Mitchel Field
4720-01-389-771799121 INTERCHANGEABLE
Hose Assembly,nonmetallic
Stewart & Stevenson Power Products Llc
5305-01-484-462399121 INTERCHANGEABLE
Screw,machine
Independent Rough Terrain Center Llc
6550-01-492-703699121 INTERCHANGEABLE
Glucose Test Reagent
Abbott Laboratories Inc. Dba Abbott Nutrition Div Abbott Diagnostics Division
6635-01-561-015999121 INTERCHANGEABLE
Reference Standard,physical Prop
United Western Technologies Corp.
5995-01-668-37069912-1 INTERCHANGEABLE
Wiring Harness,branched
Tru-Hitch, Inc.
Cross-Reference Index
Part NumberManufacturer
647747 Bae Systems Information and Electronic Systems Integration Inc. Div Bae Systems Information & Electronic Systems Integration Inc (USA)
2052747 Navcom Defense Electronics, Inc. (USA)
2052747-10 Gulton-Statham Transducers Inc (USA)
99121 PRIMARY Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp (USA)
A2052747 L3harris Technologies, Inc. (USA)
2052747 L3harris Technologies, Inc. (USA)
Related Parts
5950-00-193-8512INTERCHANGEABLE
TRANSFORMER,POWER
647747
4720-01-389-7717INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
99121
5305-01-484-4623INTERCHANGEABLE
SCREW,MACHINE
99121
6550-01-492-7036INTERCHANGEABLE
GLUCOSE TEST REAGENT
99121
6635-01-561-0159INTERCHANGEABLE
REFERENCE STANDARD,PHYSICAL PROP
99121
5995-01-668-3706INTERCHANGEABLE
WIRING HARNESS,BRANCHED
9912-1

Frequently Asked Questions

What is NSN 5310-00-785-1036?

NSN 5310-00-785-1036 is a Washer,flat, manufactured by Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp, classified under FSC 5310 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5310-00-785-1036?

NSN 5310-00-785-1036 has 6 cross-referenced part numbers: 647747 (Bae Systems Information and Electronic Systems Integration Inc. Div Bae Systems Information & Electronic Systems Integration Inc), 2052747 (Navcom Defense Electronics, Inc.), 2052747-10 (Gulton-Statham Transducers Inc), 99121 (Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp), A2052747 (L3harris Technologies, Inc.) and 1 more.

What NSN replaces 5310-00-785-1036?

There are 6 known substitutes for 5310-00-785-1036: 5950-00-193-8512, 4720-01-389-7717, 5305-01-484-4623 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 99121?

Key specifications for 99121: Thickness: 0.093 INCHES NOMINAL IN; Hole Diameter: 0.390 INCHES NOMINAL IN; Material: PLASTIC OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 7 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5310-00-785-1036 still in active supply?

NSN 5310-00-785-1036 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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