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NSN 5310-01-539-6089Government record, cited

Washer, Lock5310-01-539-6089

NSN 5310-01-539-6089 · NIIN 015396089 · Part number 4MLWSS

Assembly Fasteners Inc Dba Assembly Fasteners Inc · FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives · CAGE 1MTS3

Government record, cited

NSN 5310-01-539-6089 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-539-6089. Manufacturer of record part number: 4MLWSS.

Also searched as 5310-01-539-6089 · 5310015396089 · NIIN 015396089 · 01-539-6089 · FSC 5310 Nuts and Washers · CAGE 1MTS3 · 4MLWSS · HRBCB1 · HRBCB1

Nearby stock numbers ← 5310-01-539-6087 Washer, Lock · 5310-01-539-6090 Washer, Flat →

5310-01-539-6089 — Nuts and Washers

Features

Washer,lock — FSC 5310
1 manufacturer part number on file
Manufacturer of record: Assembly Fasteners Inc Dba Assembly Fasteners Inc

Identification

NSN: 5310-01-539-6089
NIIN: 015396089
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
Primary part number: 4MLWSS
Manufacturer: Assembly Fasteners Inc Dba Assembly Fasteners Inc

General Description

The Washer,lock, cataloged under National Stock Number 5310-01-539-6089, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Assembly Fasteners Inc Dba Assembly Fasteners Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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	5310-01-539-6089
Primary Part Number	4MLWSS
Item Name	Washer,lock
FSC / FSG	5310 / 53 — Nuts and Washers
Manufacturer	Assembly Fasteners Inc Dba Assembly Fasteners Inc
Status	ACTIVE

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

Part Number	Manufacturer
4MLWSS	Assembly Fasteners Inc Dba Assembly Fasteners Inc (USA)

Reference documents

Reference	Meaning
HRBCB1	3/9 Design control — primary reference Gse Holdings Inc. Dba Itw Military Gse Div Hobart Ground Systems
HRBCB1	C/1 Advisory reference — outside the item-of-supply concept Itw Gse Inc.

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 5310-01-539-6089?

NSN 5310-01-539-6089 is a Washer,lock, manufactured by Assembly Fasteners Inc Dba Assembly Fasteners Inc, classified under FSC 5310, Nuts and Washers. Status: active.

What part numbers are listed for NSN 5310-01-539-6089?

NSN 5310-01-539-6089 has 1 manufacturer part number on file: 4MLWSS (Assembly Fasteners Inc Dba Assembly Fasteners Inc).

What are the specifications of 4MLWSS?

Key specifications for 4MLWSS: Special Features: WASHER, SPLIT, LOCK; End Item Identification: F-22 RAPTOR. 0 specifications are documented in the U.S. Government catalog.

Is NSN 5310-01-539-6089 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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