PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

99-1125Washer,flat

Ontic Engineering & Manufacturing, Inc Dba Ontic Us · NSN 5310-00-037-4935 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-037-4935 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-037-4935. Primary manufacturer part number: 99-1125.
Features
  • Washer,flat — FSC 5310
  • Center Hole Shape Style: ROUND
  • Cross-Sectional Shape Style: RECTANGULAR
  • Material: CELLULOSE OVERALL
  • Overall Diameter: 1.718 INCHES MINIMUM AND 1.734 INCHES MAXIMUM IN
  • Material Document and Classification: MIL-A-7021 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
  • Thickness: 0.030 INCHES NOMINAL IN
  • Peripheral Shape Style: ROUND
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Cellulose Overall construction
General Description

The Washer,flat, cataloged under National Stock Number 5310-00-037-4935, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Ontic Engineering & Manufacturing, Inc Dba Ontic Us. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 11 commercial cross-references from 10 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
NSN5310-00-037-4935
Primary Part Number99-1125
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerOntic Engineering & Manufacturing, Inc Dba Ontic Us
StatusCANCELLED
Center Hole Shape StyleROUND
Cross-Sectional Shape StyleRECTANGULAR
MaterialCELLULOSE OVERALL
Overall Diameter1.718 INCHES MINIMUM AND 1.734 INCHES MAXIMUM IN
Material Document and ClassificationMIL-A-7021 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
Thickness0.030 INCHES NOMINAL IN
Peripheral Shape StyleROUND
Hole Diameter1.125 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 6
5999-00-252-63501585384 INTERCHANGEABLE
Cap,electrical
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5330-00-318-408925815 INTERCHANGEABLE
Gasket
John Deer Consumer Products Inc
2825-00-389-9792 INTERCHANGEABLE
Holder,nozzle Body
4730-00-576-2551 INTERCHANGEABLE
Bolt,fluid Passage
5365-01-257-659925815 INTERCHANGEABLE
E Ring,external
Bowmar Llc Dba Bowmar Instrument Corp
4210-01-676-980525815 INTERCHANGEABLE
Nozzle Assembly,monitor Type,fir
Tyco Fire Products Lp
Cross-Reference Index
Part NumberManufacturer
H2473 Fairbanks Morse, Llc (USA)
25815 Sundstrand Corp Sundstrand Hydraulics Div (USA)
25815 Suntec Industries Inc Del Dba Suntec (USA)
74125-21 Aeroil Products Co Inc (USA)
99-1125 PRIMARY Ontic Engineering & Manufacturing, Inc Dba Ontic Us (USA)
G309C0MP0UND1183 Parker-Hannifin Corporation Div O-Ring Division (USA)
99-1125 Donallco Inc (USA)
25815P Asphalt Equipment Co Inc (USA)
25815 Bros Inc
74145-21 Aeroil Products Co Inc (USA)
H2473 Coltec Industries Inc. Dba Fairbanks Morse Engine Div Fairbanks Morse Engine (USA)
Related Parts
5999-00-252-6350INTERCHANGEABLE
CAP,ELECTRICAL
1585384
5330-00-318-4089INTERCHANGEABLE
GASKET
25815
2825-00-389-9792INTERCHANGEABLE
HOLDER,NOZZLE BODY
4730-00-576-2551INTERCHANGEABLE
BOLT,FLUID PASSAGE
5365-01-257-6599INTERCHANGEABLE
E RING,EXTERNAL
25815
4210-01-676-9805INTERCHANGEABLE
NOZZLE ASSEMBLY,MONITOR TYPE,FIR
25815

Frequently Asked Questions

What is NSN 5310-00-037-4935?

NSN 5310-00-037-4935 is a Washer,flat, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 5310 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5310-00-037-4935?

NSN 5310-00-037-4935 has 11 cross-referenced part numbers: H2473 (Fairbanks Morse, Llc), 25815 (Sundstrand Corp Sundstrand Hydraulics Div), 25815 (Suntec Industries Inc Del Dba Suntec), 74125-21 (Aeroil Products Co Inc), 99-1125 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us) and 6 more.

What NSN replaces 5310-00-037-4935?

There are 6 known substitutes for 5310-00-037-4935: 5999-00-252-6350, 5330-00-318-4089, 2825-00-389-9792 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 99-1125?

Key specifications for 99-1125: Center Hole Shape Style: ROUND; Cross-Sectional Shape Style: RECTANGULAR; Material: CELLULOSE OVERALL; Overall Diameter: 1.718 INCHES MINIMUM AND 1.734 INCHES MAXIMUM IN. 8 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5310-00-037-4935 still in active supply?

NSN 5310-00-037-4935 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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