PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

503-12Washer,flat

Zurn Industries Inc Wilkins Regulator Co Div · NSN 5310-00-938-4937 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-938-4937 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-938-4937. Primary manufacturer part number: 503-12.
Features
  • Washer,flat — FSC 5310
  • Cross-Sectional Shape Style: RECTANGULAR
  • Hardness Rating: 80.0 DUROMETER MINIMUM AND 85.0 DUROMETER MAXIMUM
  • Material: RUBBER SYNTHETIC OVERALL
  • Center Hole Shape Style: ROUND
  • Thickness: 0.187 INCHES NOMINAL IN
  • Overall Diameter: 1.240 INCHES MINIMUM AND 1.245 INCHES MAXIMUM IN
  • Hole Diameter: 0.312 INCHES NOMINAL IN
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Rubber Synthetic Overall construction
General Description

The Washer,flat, cataloged under National Stock Number 5310-00-938-4937, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Zurn Industries Inc Wilkins Regulator Co Div. 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-938-4937
Primary Part Number503-12
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerZurn Industries Inc Wilkins Regulator Co Div
StatusACTIVE
Cross-Sectional Shape StyleRECTANGULAR
Hardness Rating80.0 DUROMETER MINIMUM AND 85.0 DUROMETER MAXIMUM
MaterialRUBBER SYNTHETIC OVERALL
Center Hole Shape StyleROUND
Thickness0.187 INCHES NOMINAL IN
Overall Diameter1.240 INCHES MINIMUM AND 1.245 INCHES MAXIMUM IN
Hole Diameter0.312 INCHES NOMINAL IN
Peripheral Shape StyleROUND
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5330-00-171-931012514 INTERCHANGEABLE
Seal,plain Encased
Garwood/feller Inc Garwood Winch Div
3110-00-227-2861 INTERCHANGEABLE
Bearing,roller,needle
4320-00-300-475950-312 INTERCHANGEABLE
Screen,inlet
Crane Pumps & Systems Pft Corp Div Crane Pumps & System Pft Corp.
5995-00-323-128550312 INTERCHANGEABLE
Cable Assembly,special Purpose,e
Alliant Techsystems Operations Llc Div Defense Electronic Systems
5305-00-369-2445 INTERCHANGEABLE
Screw,externally Relieved Body
3030-00-528-3794 INTERCHANGEABLE
Belt,v
2910-00-541-348656951 INTERCHANGEABLE
Filter Element,fluid
Pti Technologies Inc.
5210-00-711-4931PT99438 INTERCHANGEABLE
Tool Post Holder,dial Indicator
L.s. Starrett Company (the) Div Tool Division
5365-01-039-44955031-2 INTERCHANGEABLE
Spacer,sleeve
L3harris Technologies, Inc. Div Space and Airborne Systems
6680-01-124-881650312 INTERCHANGEABLE
Transmitter,liquid Quantity
Setra Systems, Inc. Dba Gems Sensors
Cross-Reference Index
Part NumberManufacturer
503-12 PRIMARY Zurn Industries Inc Wilkins Regulator Co Div (USA)
Related Parts
5330-00-171-9310INTERCHANGEABLE
SEAL,PLAIN ENCASED
12514
3110-00-227-2861INTERCHANGEABLE
BEARING,ROLLER,NEEDLE
4320-00-300-4759INTERCHANGEABLE
SCREEN,INLET
50-312
5995-00-323-1285INTERCHANGEABLE
CABLE ASSEMBLY,SPECIAL PURPOSE,E
50312
5305-00-369-2445INTERCHANGEABLE
SCREW,EXTERNALLY RELIEVED BODY
3030-00-528-3794INTERCHANGEABLE
BELT,V
2910-00-541-3486INTERCHANGEABLE
FILTER ELEMENT,FLUID
56951
5210-00-711-4931INTERCHANGEABLE
TOOL POST HOLDER,DIAL INDICATOR
PT99438
5365-01-039-4495INTERCHANGEABLE
SPACER,SLEEVE
5031-2
6680-01-124-8816INTERCHANGEABLE
TRANSMITTER,LIQUID QUANTITY
50312
4520-01-192-3652INTERCHANGEABLE
COLLAR,AIR CONDITIONING-HEATING
6120-01-669-7266INTERCHANGEABLE
TRANSFORMER,POWER
50312

Frequently Asked Questions

What is NSN 5310-00-938-4937?

NSN 5310-00-938-4937 is a Washer,flat, manufactured by Zurn Industries Inc Wilkins Regulator Co Div, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-938-4937?

NSN 5310-00-938-4937 has 1 cross-referenced part number: 503-12 (Zurn Industries Inc Wilkins Regulator Co Div).

What NSN replaces 5310-00-938-4937?

There are 12 known substitutes for 5310-00-938-4937: 5330-00-171-9310, 3110-00-227-2861, 4320-00-300-4759 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 503-12?

Key specifications for 503-12: Cross-Sectional Shape Style: RECTANGULAR; Hardness Rating: 80.0 DUROMETER MINIMUM AND 85.0 DUROMETER MAXIMUM; Material: RUBBER SYNTHETIC OVERALL; Center Hole Shape Style: ROUND. 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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