The Screw,close Tolerance, cataloged under National Stock Number 5305-01-260-0439, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-260-0439 |
| Primary Part Number | HT4049-4-21 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Fastener Length | 1.613 INCHES MINIMUM AND 1.643 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.497 INCHES MINIMUM AND 0.507 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 |
|---|---|
| HT4049-4-21 PRIMARY | Huck International, Inc (USA) |
| HT4049-4-21 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4049-4-21 | Hi-Shear Corporation (USA) |
| HT4049-4-21 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M714-4-21 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4049-4-21 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| WC4049-4-21 PRIMARY | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| ST3M714-4-21 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4049-4-21 | 5/9 Secondary reference U.S. Government activity |
| HT4049-4-21 | 5/9 Secondary reference U.S. Government activity |
| ST3M714-4-21 | 5/9 Secondary reference U.S. Government activity |
| HT4049-4-21 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-260-0439 is a Screw,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-260-0439 has 7 manufacturer part numbers on file: HT4049-4-21 (Huck International, Inc), HT4049-4-21 (Sps Technologies Ltd, Tj Brooks Division), HT4049-4-21 (Hi-Shear Corporation), HT4049-4-21 (Howmet Global Fastening Systems Inc), ST3M714-4-21 (Fastener Innovation Technology, Inc. Dba F I T) and 2 more.
Key specifications for HT4049-4-21: Fastener Length: 1.613 INCHES MINIMUM AND 1.643 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM IN; Material Document and Classification: AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 18 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.