Washer, Concave5310-01-388-0490

NSN 5310-01-388-0490 · NIIN 013880490

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

Government record, cited

Also searched as 5310-01-388-0490 · 5310013880490 · NIIN 013880490 · 01-388-0490 · FSC 5310 Nuts and Washers

Nearby stock numbers ← 5310-01-388-0488 Nut, Plain, Clinch · 5310-01-388-0492 Nut, Plain, Hexagon →

5310-01-388-0490 — Nuts and Washers

Features

Washer,concave — FSC 5310
Surface Treatment Document and Classification: QQ-P-416, TY2, CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Radius: 0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
Style Designator: CONCAVE
Material Document and Classification: MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
Outside Diameter: 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
Surface Treatment: CADMIUM AND CHROMATE OVERALL
Material: STEEL COMP E4340 OVERALL

Identification

NSN: 5310-01-388-0490
NIIN: 013880490
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives

General Description

The Washer,concave, cataloged under National Stock Number 5310-01-388-0490, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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	5310-01-388-0490
Item Name	Washer,concave
FSC / FSG	5310 / 53 — Nuts and Washers
Status	ACTIVE
Surface Treatment Document and Classification	QQ-P-416, TY2, CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Radius	0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
Style Designator	CONCAVE
Material Document and Classification	MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
Outside Diameter	0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
Surface Treatment	CADMIUM AND CHROMATE OVERALL
Material	STEEL COMP E4340 OVERALL
Hole Diameter	0.190 INCHES MINIMUM AND 0.210 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
140-030-5	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 5310-01-388-0490?

NSN 5310-01-388-0490 is a Washer,concave, classified under FSC 5310, Nuts and Washers. Status: active.

What are the specifications of 5310-01-388-0490?

Key specifications for 5310-01-388-0490: Surface Treatment Document and Classification: QQ-P-416, TY2, CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN; Style Designator: CONCAVE; Material Document and Classification: MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 8 specifications are documented in the U.S. Government catalog.

Is NSN 5310-01-388-0490 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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