PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

51872Washer,flat

The Walworth Company · NSN 5310-00-275-2778 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-275-2778 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-275-2778. Primary manufacturer part number: 51872.
Features
  • Washer,flat — FSC 5310
  • Material Document and Classification: MIL-S-4043 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
  • Overall Diameter: 0.310 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
  • Peripheral Shape Style: ROUND
  • Cross-Sectional Shape Style: RECTANGULAR
  • Thickness: 0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
  • Material: STEEL COMP 304 OVERALL
  • Center Hole Shape Style: ROUND
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 304 Overall construction
General Description

The Washer,flat, cataloged under National Stock Number 5310-00-275-2778, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is The Walworth Company. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-275-2778
Primary Part Number51872
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerThe Walworth Company
StatusACTIVE
Material Document and ClassificationMIL-S-4043 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
Overall Diameter0.310 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
Peripheral Shape StyleROUND
Cross-Sectional Shape StyleRECTANGULAR
Thickness0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
MaterialSTEEL COMP 304 OVERALL
Center Hole Shape StyleROUND
Hole Diameter0.170 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
5310-00-262-456451872 INTERCHANGEABLE
Washer,flat
Standard-Thomson Corporation
5975-00-411-168951872 INTERCHANGEABLE
Base,chassis
L3harris Technologies, Inc Div Space & Airborne Systems
4730-00-541-4773SPEC6-4-56 INTERCHANGEABLE
Coupling Half,quick Disconnect
Parker-Hannifin Corporation Dba Pneutronics Div Quick Coupler Division
5930-00-615-405651872 INTERCHANGEABLE
Switch,modified
Landoll Company, Llc
2940-00-882-591351872 INTERCHANGEABLE
Filter Element,fluid
Wix Corp
5365-01-436-3388 INTERCHANGEABLE
Spacer,sleeve
Cross-Reference Index
Part NumberManufacturer
51872 PRIMARY The Walworth Company (USA)
Related Parts
5310-00-262-4564INTERCHANGEABLE
WASHER,FLAT
51872
5975-00-411-1689INTERCHANGEABLE
BASE,CHASSIS
51872
4730-00-541-4773INTERCHANGEABLE
COUPLING HALF,QUICK DISCONNECT
SPEC6-4-56
5930-00-615-4056INTERCHANGEABLE
SWITCH,MODIFIED
51872
2940-00-882-5913INTERCHANGEABLE
FILTER ELEMENT,FLUID
51872
5365-01-436-3388INTERCHANGEABLE
SPACER,SLEEVE

Frequently Asked Questions

What is NSN 5310-00-275-2778?

NSN 5310-00-275-2778 is a Washer,flat, manufactured by The Walworth Company, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-275-2778?

NSN 5310-00-275-2778 has 1 cross-referenced part number: 51872 (The Walworth Company).

What NSN replaces 5310-00-275-2778?

There are 6 known substitutes for 5310-00-275-2778: 5310-00-262-4564, 5975-00-411-1689, 4730-00-541-4773 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 51872?

Key specifications for 51872: Material Document and Classification: MIL-S-4043 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Overall Diameter: 0.310 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN; Peripheral Shape Style: ROUND; Cross-Sectional Shape Style: RECTANGULAR. 8 total characteristics are documented in the Federal Logistics Information System.

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