Washer, Flat5310-01-591-8557

NSN 5310-01-591-8557 · NIIN 015918557 · Part number 91166A315

Mcmaster-Carr Supply Co · FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives · CAGE 39428

Government record, cited

NSN 5310-01-591-8557 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-591-8557. Manufacturer of record part number: 91166A315.

Also searched as 5310-01-591-8557 · 5310015918557 · NIIN 015918557 · 01-591-8557 · FSC 5310 Nuts and Washers · CAGE 39428 · 91166A315

Nearby stock numbers ← 5310-01-591-8554 Washer, Lock · 5310-01-591-8595 Nut, Self-Locking, Hexagon →

5310-01-591-8557 — Nuts and Washers

Features

Washer,flat — FSC 5310
Overall Diameter: 34.0 MILLIMETERS NOMINAL MM
Cross-Sectional Shape Style: RECTANGULAR
Surface Treatment: ZINC OVERALL
Peripheral Shape Style: ROUND
Material: STEEL COMP 4 OVERALL
Center Hole Shape Style: ROUND
Hole Diameter: 19.0 MILLIMETERS NOMINAL MM

Identification

NSN: 5310-01-591-8557
NIIN: 015918557
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
Primary part number: 91166A315
Manufacturer: Mcmaster-Carr Supply Co

General Description

The Washer,flat, cataloged under National Stock Number 5310-01-591-8557, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. Government technical data includes 8 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	5310-01-591-8557
Primary Part Number	91166A315
Item Name	Washer,flat
FSC / FSG	5310 / 53 — Nuts and Washers
Manufacturer	Mcmaster-Carr Supply Co
Status	ACTIVE
Overall Diameter	34.0 MILLIMETERS NOMINAL MM
Cross-Sectional Shape Style	RECTANGULAR
Surface Treatment	ZINC OVERALL
Peripheral Shape Style	ROUND
Material	STEEL COMP 4 OVERALL
Center Hole Shape Style	ROUND
Hole Diameter	19.0 MILLIMETERS NOMINAL MM
Thickness	2.7 MILLIMETERS MINIMUM AND 3.3 MILLIMETERS MAXIMUM MM

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

Part Number	Manufacturer
91166A315 PRIMARY	Mcmaster-Carr Supply Co (USA)

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 5310-01-591-8557?

NSN 5310-01-591-8557 is a Washer,flat, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5310, Nuts and Washers. Status: active.

What part numbers are listed for NSN 5310-01-591-8557?

NSN 5310-01-591-8557 has 1 manufacturer part number on file: 91166A315 (Mcmaster-Carr Supply Co).

What are the specifications of 91166A315?

Key specifications for 91166A315: Overall Diameter: 34.0 MILLIMETERS NOMINAL MM; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: ZINC OVERALL; Peripheral Shape Style: ROUND. 8 specifications are documented in the U.S. Government catalog.

Is NSN 5310-01-591-8557 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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