Parts Kit, Fastener5325-01-581-6501

NSN 5325-01-581-6501 · NIIN 015816501 · Part number 131-0421

Caterpillar Inc Div Caterpillar Defense · FSC 5325 — Fastening Devices · FSG 53 — Hardware and Abrasives · CAGE 11083

Government record, cited

NSN 5325-01-581-6501 — this item is cataloged by the U.S. Government under National Stock Number 5325-01-581-6501. Manufacturer of record part number: 131-0421.

Also searched as 5325-01-581-6501 · 5325015816501 · NIIN 015816501 · 01-581-6501 · FSC 5325 Fastening Devices · CAGE 11083 · 131-0421

Nearby stock numbers ← 5325-01-581-6500 Parts Kit, Fastener · 5325-01-581-6582 Insert, Screw Thread →

Features

Parts Kit,fastener — FSC 5325
1 manufacturer part number on file
Manufacturer of record: Caterpillar Inc Div Caterpillar Defense

Identification

NSN: 5325-01-581-6501
NIIN: 015816501
FSC: 5325 — Fastening Devices
FSG: 53 — Hardware and Abrasives
Primary part number: 131-0421
Manufacturer: Caterpillar Inc Div Caterpillar Defense

General Description

The Parts Kit,fastener, cataloged under National Stock Number 5325-01-581-6501, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	5325-01-581-6501
Primary Part Number	131-0421
Item Name	Parts Kit,fastener
FSC / FSG	5325 / 53 — Fastening Devices
Manufacturer	Caterpillar Inc Div Caterpillar Defense
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

⇄ Related Items 1

Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.

4130-01-633-4298KALA-016E-TAC-800 POSSIBLE MATCH

COMPRESSOR,REFRIGERATION

Possible match (shared part number)Copeland Lp Dba Copeland Co

Cross-Reference Index

Part Number	Manufacturer
131-0421 PRIMARY	Caterpillar Inc Div Caterpillar Defense (USA)

Related Parts

4130-01-633-4298POSSIBLE MATCH

COMPRESSOR,REFRIGERATION

KALA-016E-TAC-800

Frequently Asked Questions

What is NSN 5325-01-581-6501?

NSN 5325-01-581-6501 is a Parts Kit,fastener, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5325, Fastening Devices. Status: active.

What part numbers are listed for NSN 5325-01-581-6501?

NSN 5325-01-581-6501 has 1 manufacturer part number on file: 131-0421 (Caterpillar Inc Div Caterpillar Defense).

What NSN replaces 5325-01-581-6501?

1 possible match (shared part number, not a government interchangeability claim): 4130-01-633-4298. Verify interchangeability with system specifications before substitution.

What are the specifications of 131-0421?

Key specifications for 131-0421: Part Name Assigned by Controlling Agency: FASTENER GROUP; End Item Identification: ENGINE, DIESEL MDL 3512B. 0 specifications are documented in the U.S. Government catalog.

Is NSN 5325-01-581-6501 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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