NSN 5310-00-404-3788 · NIIN 004043788 · Part number 3B4520
Caterpillar Inc Div Caterpillar Defense · FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives · CAGE 11083
Government record, cited
NSN 5310-00-404-3788 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-404-3788. Manufacturer of record part number: 3B4520.
Also searched as5310-00-404-3788 ·
5310004043788 ·
NIIN 004043788 ·
00-404-3788 ·
FSC 5310 Nuts and Washers · CAGE 11083 · 3B4520
Material Document and Classification: 1E404-FSC-11083 MFR REF SINGLE MATERIAL RESPONSE OVERALL
Outside Diameter: 2.011 INCHES NOMINAL IN
Material Thickness: 0.312 INCHES NOMINAL IN
Material: STEEL OVERALL
Hole Diameter: 1.293 INCHES NOMINAL IN
Identification
NSN: 5310-00-404-3788
NIIN: 004043788
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
Primary part number: 3B4520
Manufacturer: Caterpillar Inc Div Caterpillar Defense
General Description
The Washer,lock, cataloged under National Stock Number 5310-00-404-3788, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 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
5310-00-404-3788
Primary Part Number
3B4520
Item Name
Washer,lock
FSC / FSG
5310 / 53 — Nuts and Washers
Manufacturer
Caterpillar Inc Div Caterpillar Defense
Status
ACTIVE
Heat Treatment
AS FABRICATED
Style Designator
SPLIT HELICAL-RIGHT HAND
Material Document and Classification
1E404-FSC-11083 MFR REF 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 5310-00-404-3788?
NSN 5310-00-404-3788 is a Washer,lock, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5310, Nuts and Washers. Status: active.
What part numbers are listed for NSN 5310-00-404-3788?
NSN 5310-00-404-3788 has 1 manufacturer part number on file: 3B4520 (Caterpillar Inc Div Caterpillar Defense).
What are the specifications of 3B4520?
Key specifications for 3B4520: Heat Treatment: AS FABRICATED; Style Designator: SPLIT HELICAL-RIGHT HAND; Material Document and Classification: 1E404-FSC-11083 MFR REF SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 2.011 INCHES NOMINAL IN. 7 specifications are documented in the U.S. Government catalog.
Is NSN 5310-00-404-3788 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.