Valve Flapper, Pump4320-01-256-3660

NSN 4320-01-256-3660 · NIIN 012563660 · Part number VAL-1929

Atlas Copco Holyoke Inc · FSC 4320 — Power and Hand Pumps · FSG 43 — Pumps and Compressors · CAGE 59379

Government record, cited

NSN 4320-01-256-3660 — this item is cataloged by the U.S. Government under National Stock Number 4320-01-256-3660. Manufacturer of record part number: VAL-1929.

Also searched as 4320-01-256-3660 · 4320012563660 · NIIN 012563660 · 01-256-3660 · FSC 4320 Power and Hand Pumps · CAGE 59379 · VAL-1929

Nearby stock numbers ← 4320-01-256-3652 Housing, Liquid Pump · 4320-01-256-3698 Piston, Pump →

Features

Valve Flapper,pump — FSC 4320
1 manufacturer part number on file
Manufacturer of record: Atlas Copco Holyoke Inc

Identification

NSN: 4320-01-256-3660
NIIN: 012563660
FSC: 4320 — Power and Hand Pumps
FSG: 43 — Pumps and Compressors
Primary part number: VAL-1929
Manufacturer: Atlas Copco Holyoke Inc

General Description

The Valve Flapper,pump, cataloged under National Stock Number 4320-01-256-3660, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Atlas Copco Holyoke Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4320-01-256-3660
Primary Part Number	VAL-1929
Item Name	Valve Flapper,pump
FSC / FSG	4320 / 43 — Power and Hand Pumps
Manufacturer	Atlas Copco Holyoke 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
VAL-1929 PRIMARY	Atlas Copco Holyoke Inc (USA)

No interchangeability data on file.

Other items in FSC 4320 — Power and Hand Pumps

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

4320-00-001-1633

4320-00-001-1633 · Item name not on file

4320-00-001-2628

RETAINER AND PIN

4320-00-001-2629

HOUSING AND PIN

4320-00-001-2630

PUMP,CENTRIFUGAL

4320-00-001-2631

4320-00-001-2631 · Item name not on file

4320-00-001-2632

4320-00-001-2632 · Item name not on file

4320-00-001-3377

4320-00-001-3377 · Item name not on file

4320-00-001-3384

4320-00-001-3384 · Item name not on file

Frequently Asked Questions

What is NSN 4320-01-256-3660?

NSN 4320-01-256-3660 is a Valve Flapper,pump, manufactured by Atlas Copco Holyoke Inc, classified under FSC 4320, Power and Hand Pumps. Status: active.

What part numbers are listed for NSN 4320-01-256-3660?

NSN 4320-01-256-3660 has 1 manufacturer part number on file: VAL-1929 (Atlas Copco Holyoke Inc).

What are the specifications of VAL-1929?

Key specifications for VAL-1929: Special Features: MATL FLEX PLASTIC; End Item Identification: AIR COMPRESSOR;ATLAS HOLYOKE INC,MODEL 1150. 0 specifications are documented in the U.S. Government catalog.

Is NSN 4320-01-256-3660 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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