Screw, Cap, Socket Head5305-01-643-3347

NSN 5305-01-643-3347 · NIIN 016433347

FSC 5305 — Screws · FSG 53 — Hardware and Abrasives

Government record, cited

Also searched as 5305-01-643-3347 · 5305016433347 · NIIN 016433347 · 01-643-3347 · FSC 5305 Screws

Nearby stock numbers ← 5305-01-643-3346 Screw, Shoulder · 5305-01-643-3351 Screw, Cap, Socket Head →

5305-01-643-3347 — Screws

Features

Screw,cap,socket Head — FSC 5305
Width Across Flats: 0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
Head Height: 0.368 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
Fastener Length: 4.625 INCHES NOMINAL IN
Thread Length: 1.250 INCHES MINIMUM IN
Nominal Thread Diameter: 0.375 INCHES IN
Head Style: FLAT CHAMFER
Thread Direction: RIGHT-HAND

Identification

NSN: 5305-01-643-3347
NIIN: 016433347
FSC: 5305 — Screws
FSG: 53 — Hardware and Abrasives

General Description

The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-643-3347, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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	5305-01-643-3347
Item Name	Screw,cap,socket Head
FSC / FSG	5305 / 53 — Screws
Status	ACTIVE
Width Across Flats	0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
Head Height	0.368 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
Fastener Length	4.625 INCHES NOMINAL IN
Thread Length	1.250 INCHES MINIMUM IN
Nominal Thread Diameter	0.375 INCHES IN
Head Style	FLAT CHAMFER
Thread Direction	RIGHT-HAND
Internal Drive Style	HEXAGON
Thread Class	3A A
Thread Quantity Per Inch	24
Material	IRON ALLOY 660 OVERALL
Hole Quantity	6
Thread Series Designator	UNRF
Hole Type	DRILLED
Hole Diameter	0.103 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
Head Diameter	0.550 INCHES MINIMUM AND 0.562 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
NAS1351N6H74	3/2 Design control — primary reference U.S. Government activity

No interchangeability data on file.

Other items in FSC 5305 — Screws

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5305-00-001-5016

5305-00-001-5016 · Item name not on file

5305-00-001-9160

5305-00-001-9160 · Item name not on file

5305-00-001-9629

SCREW,ADJUSTING CLEVIS

5305-00-001-9742

5305-00-001-9742 · Item name not on file

5305-00-001-9768

SCREW,CAP,SOCKET HEAD

5305-00-003-4306

SCREW,MACHINE

5305-00-003-6694

5305-00-003-6694 · Item name not on file

5305-00-003-6753

5305-00-003-6753 · Item name not on file

Frequently Asked Questions

What is NSN 5305-01-643-3347?

NSN 5305-01-643-3347 is a Screw,cap,socket Head, classified under FSC 5305, Screws. Status: active.

What are the specifications of 5305-01-643-3347?

Key specifications for 5305-01-643-3347: Width Across Flats: 0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN; Head Height: 0.368 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Fastener Length: 4.625 INCHES NOMINAL IN; Thread Length: 1.250 INCHES MINIMUM IN. 16 specifications are documented in the U.S. Government catalog.

Is NSN 5305-01-643-3347 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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