The Screw,close Tolerance, cataloged under National Stock Number 5305-00-151-7979, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-151-7979 |
| Primary Part Number | 54291-3-4P |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Fastener Length | 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416 TY 2, CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.406 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.3765 INCHES MINIMUM AND 0.3813 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 |
|---|---|
| HT3N-4P | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| 54291-3-4P PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT3N-4P PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT3N-4P PRIMARY | Hi-Shear Corporation (USA) |
| HT3N-4P | Satair A/s (DNK) |
| HT3N4HS | Satair A/s (DNK) |
| Reference | Meaning |
|---|---|
| 3M123-3-4P | 5/2 Secondary reference U.S. Government activity |
| HT3N4HS | 5/9 Secondary reference Hi-Shear Corporation |
| HT1029A3-4P | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| HT123-3-4P | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 3M123-3-4P | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT123-3-4P | 5/9 Secondary reference U.S. Government activity |
| HT1029A3-4P | 5/9 Secondary reference U.S. Government activity |
| 54291-3-4P | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-00-151-7979 is a Screw,close Tolerance, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-151-7979 has 6 manufacturer part numbers on file: HT3N-4P (Fairchild Fasteners Europe - Vsd Gmbh), 54291-3-4P (Sps Technologies, Llc Dba PB Fasteners), HT3N-4P (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT3N-4P (Hi-Shear Corporation), HT3N-4P (Satair A/s) and 1 more.
Key specifications for 54291-3-4P: Fastener Length: 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416 TY 2, CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.406 INCHES NOMINAL IN; Material Document and Classification: AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.