Washer, Concave5310-00-902-9921

NSN 5310-00-902-9921 · NIIN 009029921

FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives

Government record, cited

Also searched as 5310-00-902-9921 · 5310009029921 · NIIN 009029921 · 00-902-9921 · FSC 5310 Nuts and Washers

Nearby stock numbers ← 5310-00-902-9920 · 5310-00-903-0165 →

5310-00-902-9921 — Nuts and Washers

Features

Washer,concave — FSC 5310
Surface Finish: 63.0 MICROINCHES ALL SURFACES
Radius: 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
Style Designator: CONCAVE
Material Document and Classification: MIL-S-7720 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
Outside Diameter: 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
Material Thickness: 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN
Recess Diameter: 1.000 INCHES NOMINAL IN

Identification

NSN: 5310-00-902-9921
NIIN: 009029921
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives

General Description

The Washer,concave, cataloged under National Stock Number 5310-00-902-9921, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	5310-00-902-9921
Item Name	Washer,concave
FSC / FSG	5310 / 53 — Nuts and Washers
Status	ACTIVE
Surface Finish	63.0 MICROINCHES ALL SURFACES
Radius	1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
Style Designator	CONCAVE
Material Document and Classification	MIL-S-7720 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
Outside Diameter	0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
Material Thickness	0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN
Recess Diameter	1.000 INCHES NOMINAL IN
Surface Treatment	PASSIVATE OVERALL
Hole Diameter	0.401 INCHES MINIMUM AND 0.409 INCHES MAXIMUM 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

Cross-Reference Index

No manufacturer part numbers on file in the U.S. Government catalog.

Reference documents

Reference	Meaning
541608-1	3/2 Design control — primary reference U.S. Government activity

No interchangeability data on file.

Other items in FSC 5310 — Nuts and Washers

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 5310-00-902-9921?

NSN 5310-00-902-9921 is a Washer,concave, classified under FSC 5310, Nuts and Washers. Status: active.

What are the specifications of 5310-00-902-9921?

Key specifications for 5310-00-902-9921: Surface Finish: 63.0 MICROINCHES ALL SURFACES; Radius: 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN; Style Designator: CONCAVE; Material Document and Classification: MIL-S-7720 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 9 specifications are documented in the U.S. Government catalog.

Is NSN 5310-00-902-9921 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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