PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

101209Washer,flat

Maysteel Products Corp Po Box 1240 Menomonee Falls Wi 53052 · NSN 5310-01-558-9053 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-558-9053 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-558-9053. Primary manufacturer part number: 101209.
Features
  • Washer,flat — FSC 5310
  • Hole Diameter: 0.312 INCHES NOMINAL IN
  • Surface Treatment: CADMIUM OR ZINC OVERALL
  • Material: STEEL OVERALL
  • Peripheral Shape Style: ROUND
  • Overall Diameter: 0.875 INCHES NOMINAL IN
  • Center Hole Shape Style: ROUND
  • Cross-Sectional Shape Style: RECTANGULAR
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Washer,flat, cataloged under National Stock Number 5310-01-558-9053, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Maysteel Products Corp Po Box 1240 Menomonee Falls Wi 53052. Government technical data includes 7 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. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-558-9053
Primary Part Number101209
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerMaysteel Products Corp Po Box 1240 Menomonee Falls Wi 53052
StatusACTIVE
Hole Diameter0.312 INCHES NOMINAL IN
Surface TreatmentCADMIUM OR ZINC OVERALL
MaterialSTEEL OVERALL
Peripheral Shape StyleROUND
Overall Diameter0.875 INCHES NOMINAL IN
Center Hole Shape StyleROUND
Cross-Sectional Shape StyleRECTANGULAR
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
5998-00-491-5689101209 INTERCHANGEABLE
Circuit Card Assembly
Aimtron Systems, Llc
5961-01-311-3275101-209 INTERCHANGEABLE
Semiconductor Device Assembly
Prestolite Electric Inc
4310-01-391-8280 INTERCHANGEABLE
Ring,piston
5930-01-532-6162101209 INTERCHANGEABLE
Switch,electronic
Mackay Communications, Inc Div Government
Cross-Reference Index
Part NumberManufacturer
101209 PRIMARY Maysteel Products Corp Po Box 1240 Menomonee Falls Wi 53052 (USA)
Related Parts
5998-00-491-5689INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
101209
5961-01-311-3275INTERCHANGEABLE
SEMICONDUCTOR DEVICE ASSEMBLY
101-209
4310-01-391-8280INTERCHANGEABLE
RING,PISTON
5930-01-532-6162INTERCHANGEABLE
SWITCH,ELECTRONIC
101209

Frequently Asked Questions

What is NSN 5310-01-558-9053?

NSN 5310-01-558-9053 is a Washer,flat, manufactured by Maysteel Products Corp Po Box 1240 Menomonee Falls Wi 53052, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-558-9053?

NSN 5310-01-558-9053 has 1 cross-referenced part number: 101209 (Maysteel Products Corp Po Box 1240 Menomonee Falls Wi 53052).

What NSN replaces 5310-01-558-9053?

There are 4 known substitutes for 5310-01-558-9053: 5998-00-491-5689, 5961-01-311-3275, 4310-01-391-8280 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 101209?

Key specifications for 101209: Hole Diameter: 0.312 INCHES NOMINAL IN; Surface Treatment: CADMIUM OR ZINC OVERALL; Material: STEEL OVERALL; Peripheral 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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