Washer, Flat5310-01-657-0340

NSN 5310-01-657-0340 · NIIN 016570340

FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives

Government record, cited

Also searched as 5310-01-657-0340 · 5310016570340 · NIIN 016570340 · 01-657-0340 · FSC 5310 Nuts and Washers · 4C22205 · 4C22205-101A

Nearby stock numbers ← 5310-01-657-0258 Nut, Self-Locking, Hexagon · 5310-01-657-0375 Nut, Blind Assembly →

5310-01-657-0340 — Nuts and Washers

Features

Washer,flat — FSC 5310
Overall Diameter: 0.335 INCHES NOMINAL IN
Cross-Sectional Shape Style: BLANK RECTANGULAR
Peripheral Shape Style: ROUND
Material: COPPER ALLOY OVERALL
Center Hole Shape Style: ROUND
Hole Diameter: 0.256 INCHES MINIMUM AND 0.263 INCHES MAXIMUM IN
Thickness: 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN

Identification

NSN: 5310-01-657-0340
NIIN: 016570340
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives

General Description

The Washer,flat, cataloged under National Stock Number 5310-01-657-0340, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	5310-01-657-0340
Item Name	Washer,flat
FSC / FSG	5310 / 53 — Nuts and Washers
Status	ACTIVE
Overall Diameter	0.335 INCHES NOMINAL IN
Cross-Sectional Shape Style	BLANK RECTANGULAR
Peripheral Shape Style	ROUND
Material	COPPER ALLOY OVERALL
Center Hole Shape Style	ROUND
Hole Diameter	0.256 INCHES MINIMUM AND 0.263 INCHES MAXIMUM IN
Thickness	0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

No manufacturer part numbers on file in the U.S. Government catalog.

Reference documents

Reference	Meaning
4C22205	D/9 Drawing number reference only U.S. Government activity
4C22205-101A	3/2 Design control — primary reference U.S. Government activity

No interchangeability data on file.

Other items in FSC 5310 — Nuts and Washers

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5310-00-000-0040

5310-00-000-0040 · Item name not on file

5310-00-000-0077

NUT,PLAIN,ROUND

5310-00-000-0079

WASHER,FLAT

5310-00-000-0079

WASHER,FLAT

5310-00-000-1146

5310-00-000-1146 · Item name not on file

5310-00-000-3815

5310-00-000-3815 · Item name not on file

5310-00-000-4532

5310-00-000-4532 · Item name not on file

5310-00-000-4540

5310-00-000-4540 · Item name not on file

Frequently Asked Questions

What is NSN 5310-01-657-0340?

NSN 5310-01-657-0340 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.

What are the specifications of 5310-01-657-0340?

Key specifications for 5310-01-657-0340: Overall Diameter: 0.335 INCHES NOMINAL IN; Cross-Sectional Shape Style: BLANK RECTANGULAR; Peripheral Shape Style: ROUND; Part Name Assigned by Controlling Agency: WASHER - RUDDER PEDAL ADJUST. 7 specifications are documented in the U.S. Government catalog.

Is NSN 5310-01-657-0340 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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