NSN 5310-01-181-2503 · NIIN 011812503 · Part number M4BS4320
Ufc Aerospace Europe Limited · FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives · CAGE K4975
Government record, cited
NSN 5310-01-181-2503 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-181-2503. Manufacturer of record part number: M4BS4320.
Also searched as5310-01-181-2503 ·
5310011812503 ·
NIIN 011812503 ·
01-181-2503 ·
FSC 5310 Nuts and Washers · CAGE K4975 · M4BS4320 · 081937-99
Material Document and Classification: BS4320 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL
Cross-Sectional Shape Style: RECTANGULAR
Peripheral Shape Style: ROUND
Material: STEEL OVERALL
Center Hole Shape Style: ROUND
Hole Diameter: 0.173 INCHES NOMINAL IN
Identification
NSN: 5310-01-181-2503
NIIN: 011812503
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
Primary part number: M4BS4320
Manufacturer: Ufc Aerospace Europe Limited
General Description
The Washer,flat, cataloged under National Stock Number 5310-01-181-2503, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Ufc Aerospace Europe Limited. Government technical data includes 8 specifications, 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. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
5310-01-181-2503
Primary Part Number
M4BS4320
Item Name
Washer,flat
FSC / FSG
5310 / 53 — Nuts and Washers
Manufacturer
Ufc Aerospace Europe Limited
Status
ACTIVE
Overall Diameter
0.354 INCHES NOMINAL IN
Material Document and Classification
BS4320 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL
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 5310-01-181-2503?
NSN 5310-01-181-2503 is a Washer,flat, manufactured by Ufc Aerospace Europe Limited, classified under FSC 5310, Nuts and Washers. Status: active.
What part numbers are listed for NSN 5310-01-181-2503?
NSN 5310-01-181-2503 has 2 manufacturer part numbers on file: M4BS4320 (Ufc Aerospace Europe Limited), 081937-99 (Bsi Standards Limited).
What are the specifications of M4BS4320?
Key specifications for M4BS4320: Overall Diameter: 0.354 INCHES NOMINAL IN; Material Document and Classification: BS4320 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 8 specifications are documented in the U.S. Government catalog.
Is NSN 5310-01-181-2503 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.