NSN 5310-01-666-3297 · NIIN 016663297 · Part number 4308490
Oshkosh Defense Llc · FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives · CAGE 75Q65
Government record, cited
NSN 5310-01-666-3297 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-666-3297. Manufacturer of record part number: 4308490.
Also searched as5310-01-666-3297 ·
5310016663297 ·
NIIN 016663297 ·
01-666-3297 ·
FSC 5310 Nuts and Washers · CAGE 75Q65 · 4308490
Nearby stock numbers← 5310-01-666-3133 Nut Assembly, Self-Locking, Gang C
·
5310-01-666-3298 Nut, Plain, Hexagon →
5310-01-666-3297 — Nuts and Washers
Features
Washer,concave — FSC 5310
Style Designator: SPRING TENSION
Outside Diameter: 20.35 MILLIMETERS MINIMUM AND 21.65 MILLIMETERS MAXIMUM MM
Material Thickness: 0.93 MILLIMETERS MINIMUM AND 1.07 MILLIMETERS MAXIMUM MM
Material: STEEL OVERALL
Hole Diameter: 10.50 MILLIMETERS MINIMUM AND 10.93 MILLIMETERS MAXIMUM MM
1 manufacturer part number on file
Manufacturer of record: Oshkosh Defense Llc
Identification
NSN: 5310-01-666-3297
NIIN: 016663297
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
Primary part number: 4308490
Manufacturer: Oshkosh Defense Llc
General Description
The Washer,concave, cataloged under National Stock Number 5310-01-666-3297, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Oshkosh Defense Llc. Government technical data includes 5 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
5310-01-666-3297
Primary Part Number
4308490
Item Name
Washer,concave
FSC / FSG
5310 / 53 — Nuts and Washers
Manufacturer
Oshkosh Defense Llc
Status
ACTIVE
Style Designator
SPRING TENSION
Outside Diameter
20.35 MILLIMETERS MINIMUM AND 21.65 MILLIMETERS MAXIMUM MM
Material Thickness
0.93 MILLIMETERS MINIMUM AND 1.07 MILLIMETERS MAXIMUM MM
Material
STEEL OVERALL
Hole Diameter
10.50 MILLIMETERS MINIMUM AND 10.93 MILLIMETERS MAXIMUM MM
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 5310-01-666-3297?
NSN 5310-01-666-3297 is a Washer,concave, manufactured by Oshkosh Defense Llc, classified under FSC 5310, Nuts and Washers. Status: active.
What part numbers are listed for NSN 5310-01-666-3297?
NSN 5310-01-666-3297 has 1 manufacturer part number on file: 4308490 (Oshkosh Defense Llc).
What are the specifications of 4308490?
Key specifications for 4308490: Overall Height: 2.1 MILLIMETERS MINIMUM AND 4.2 MILLIMETERS MAXIMUM MM; Style Designator: SPRING TENSION; Outside Diameter: 20.35 MILLIMETERS MINIMUM AND 21.65 MILLIMETERS MAXIMUM MM; Material Thickness: 0.93 MILLIMETERS MINIMUM AND 1.07 MILLIMETERS MAXIMUM MM. 5 specifications are documented in the U.S. Government catalog.
Is NSN 5310-01-666-3297 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.