The Screw,close Tolerance, cataloged under National Stock Number 5305-01-604-4653, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Pilgrim Screw Corp Dba Pilgrim Aerospace Fasteners Div Arizona. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-604-4653 |
| Primary Part Number | BACS12HU4A14 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Pilgrim Screw Corp Dba Pilgrim Aerospace Fasteners Div Arizona |
| Status | ACTIVE |
| Spline Minor Diameter | 0.221 INCHES NOMINAL IN |
| Head Height | 0.140 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Fastener Length | 1.278 INCHES NOMINAL IN |
| Thread Length | 0.403 INCHES NOMINAL IN |
| Spline Major Diameter | 0.221 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Head Style | PAN NO. 2 |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.875 INCHES NOMINAL IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | TORX |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.477 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| BACS12HU4A14 | Pilgrim Screw Corp Dba Pilgrim Aerospace Fasteners Div Arizona (USA) |
| BACS12HU4A14 | The Boeing Company (USA) |
| BACS12HU4A14 | Heartland Precision Fasteners Inc (USA) |
| BACS12HU4A14 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| BACS12HU4A14 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-604-4653 is a Screw,close Tolerance, manufactured by Pilgrim Screw Corp Dba Pilgrim Aerospace Fasteners Div Arizona, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-604-4653 has 4 manufacturer part numbers on file: BACS12HU4A14 (Pilgrim Screw Corp Dba Pilgrim Aerospace Fasteners Div Arizona), BACS12HU4A14 (The Boeing Company), BACS12HU4A14 (Heartland Precision Fasteners Inc), BACS12HU4A14 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company).
Key specifications for BACS12HU4A14: Spline Minor Diameter: 0.221 INCHES NOMINAL IN; Head Height: 0.140 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN; Fastener Length: 1.278 INCHES NOMINAL IN; Thread Length: 0.403 INCHES NOMINAL IN. 17 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.