Nut, Self-Locking, Extended Washer5310-01-231-2220

NSN 5310-01-231-2220 · NIIN 012312220

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

Government record, cited

Also searched as 5310-01-231-2220 · 5310012312220 · NIIN 012312220 · 01-231-2220 · FSC 5310 Nuts and Washers

Nearby stock numbers ← 5310-01-231-2219 · 5310-01-231-2674 Nut, Plain, Hexagon →

5310-01-231-2220 — Nuts and Washers

Features

Nut,self-Locking,extended Washer — FSC 5310
Lubrication: DRY FILM LUBRICANT
Washer Outside Diameter: 0.788 INCHES NOMINAL IN
Width Across Flats: 0.616 INCHES MINIMUM AND 0.627 INCHES MAXIMUM IN
Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF)
Washer Thickness: 0.074 INCHES NOMINAL IN
Thread Direction: RIGHT-HAND
Nominal Thread Size: 0.500 INCHES IN

Identification

NSN: 5310-01-231-2220
NIIN: 012312220
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives

General Description

The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-231-2220, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	5310-01-231-2220
Item Name	Nut,self-Locking,extended Washer
FSC / FSG	5310 / 53 — Nuts and Washers
Status	ACTIVE
Lubrication	DRY FILM LUBRICANT
Washer Outside Diameter	0.788 INCHES NOMINAL IN
Width Across Flats	0.616 INCHES MINIMUM AND 0.627 INCHES MAXIMUM IN
Thread Series	UNIFIED NATIONAL JOINT FINE (UNJF)
Washer Thickness	0.074 INCHES NOMINAL IN
Thread Direction	RIGHT-HAND
Nominal Thread Size	0.500 INCHES IN
Specification/standard Data	80205-1805 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Locking Feature	PREVAILING TORQUE ALL METAL DESIGN
Surface Treatment	PASSIVATE OVERALL
Nut Style	DOUBLE HEXAGON
Thread Class	3B
Thread Quantity Per Inch	20
Material	IRON ALLOY 660 OVERALL

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
NAS1805-8	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 5310-01-231-2220?

NSN 5310-01-231-2220 is a Nut,self-Locking,extended Washer, classified under FSC 5310, Nuts and Washers. Status: active.

What are the specifications of 5310-01-231-2220?

Key specifications for 5310-01-231-2220: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.500 INCHES NOMINAL IN; Washer Outside Diameter: 0.788 INCHES NOMINAL IN; Width Across Flats: 0.616 INCHES MINIMUM AND 0.627 INCHES MAXIMUM IN. 14 specifications are documented in the U.S. Government catalog.

Is NSN 5310-01-231-2220 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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