NSN 4320-00-375-4945 · NIIN 003754945 · Part number AY1
Circor Naval Solutions Llc Dba Warren Pumps · FSC 4320 — Power and Hand Pumps · FSG 43 — Pumps and Compressors · CAGE 63857
Government record, cited
NSN 4320-00-375-4945 — this item is cataloged by the U.S. Government under National Stock Number 4320-00-375-4945. Manufacturer of record part number: AY1.
Also searched as4320-00-375-4945 ·
4320003754945 ·
NIIN 003754945 ·
00-375-4945 ·
FSC 4320 Power and Hand Pumps · CAGE 63857 · AY1 · QQ-C-390B · 9R-1151 PC12 · R-1151 · 871B0001
General Characteristics Item Description: BRONZE,MIL-B-16261,GRADE 1,1.014 IN. ID,1.749 IN. OD,1.938 IN. LG,0.031 IN. BY 45 DEG,7 GROOVES 0.094 IN. W,0.063 IN. DEEP,0.063 IN. BETWEEN GROOVES IN
2 manufacturer part numbers on file
Manufacturer of record: Circor Naval Solutions Llc Dba Warren Pumps
The Ring,pressure Breakdown,pump, cataloged under National Stock Number 4320-00-375-4945, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Circor Naval Solutions Llc Dba Warren Pumps. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government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
4320-00-375-4945
Primary Part Number
AY1
Item Name
Ring,pressure Breakdown,pump
FSC / FSG
4320 / 43 — Power and Hand Pumps
Manufacturer
Circor Naval Solutions Llc Dba Warren Pumps
Status
ACTIVE
General Characteristics Item Description
BRONZE,MIL-B-16261,GRADE 1,1.014 IN. ID,1.749 IN. OD,1.938 IN. LG,0.031 IN. BY 45 DEG,7 GROOVES 0.094 IN. W,0.063 IN. DEEP,0.063 IN. BETWEEN GROOVES 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
⇄Related Items7
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
3120-00-528-6129POSSIBLE MATCH
BEARING,SLEEVE
Possible match (shared part number)
4320-00-537-2153A0AVNI168POSSIBLE MATCH
4320-00-537-2153 · Item name not on file
Possible match (shared part number)M.t. Davidson Company
4320-00-564-3356LL50POSSIBLE MATCH
4320-00-564-3356 · Item name not on file
Possible match (shared part number)Circor Naval Solutions Llc Dba Warren Pumps
4320-00-792-617299K1 1-2B-PPOSSIBLE MATCH
RING,WEARING
Possible match (shared part number)Fairbanks Morse, Llc
4320-00-893-1043B113APOSSIBLE MATCH
RING,WEARING
Possible match (shared part number)Circor Naval Solutions Llc Dba Warren Pumps
5330-00-939-04649754-54POSSIBLE MATCH
RETAINER,PACKING
Possible match (shared part number)Goodrich Corporation
5306-01-602-4157R-1151POSSIBLE MATCH
BOLT,MACHINE
Possible match (shared part number)Modern Suspension Systems Inc Dba Rockford Metal Products Div
NSN 4320-00-375-4945 is a Ring,pressure Breakdown,pump, manufactured by Circor Naval Solutions Llc Dba Warren Pumps, classified under FSC 4320, Power and Hand Pumps. Status: active.
What part numbers are listed for NSN 4320-00-375-4945?
NSN 4320-00-375-4945 has 2 manufacturer part numbers on file: 9R-1151 PC12 (Circor Naval Solutions Llc Dba Warren Pumps), AY1 (Circor Naval Solutions Llc Dba Warren Pumps).
What NSN replaces 4320-00-375-4945?
7 possible matches (shared part number, not a government interchangeability claim): 3120-00-528-6129, 4320-00-537-2153, 4320-00-564-3356. Verify interchangeability with system specifications before substitution.
What are the specifications of AY1?
Key specifications for AY1: General Characteristics Item Description: BRONZE,MIL-B-16261,GRADE 1,1.014 IN. ID,1.749 IN. OD,1.938 IN. LG,0.031 IN. BY 45 DEG,7 GROOVES 0.094 IN. W,0.063 IN. DEEP,0.063 IN. BETWEEN GROOVES IN. 1 specification is documented in the U.S. Government catalog.
Is NSN 4320-00-375-4945 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.