The Screw,close Tolerance, cataloged under National Stock Number 5305-01-337-6985, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-337-6985 |
| Primary Part Number | HT4075VS4-12-55 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 1.204 INCHES MINIMUM AND 1.234 INCHES MAXIMUM IN |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Material Document and Classification | AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PHOSPHATE 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 | 28 |
| Material | TITANIUM ALLOY UNS R56400 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.456 INCHES MINIMUM AND 0.508 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 |
|---|---|
| HT4075VS4-12-55 PRIMARY | Hi-Shear Corporation (USA) |
| HT4075VS4-12-55 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| HT4075VS4-12-55 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| HT4075VS4-12-55 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT4075VS4-12-55 | 5/9 Secondary reference U.S. Government activity |
| HT4075VS4-12-55 | 5/9 Secondary reference Deutsch Co the |
| HT4075VS4-12-55 | 5/9 Secondary reference U.S. Government activity |
| HT4075VS4-12-55 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-337-6985 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-337-6985 has 2 manufacturer part numbers on file: HT4075VS4-12-55 (Hi-Shear Corporation), HT4075VS4-12-55 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc).
Key specifications for HT4075VS4-12-55: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 1.204 INCHES MINIMUM AND 1.234 INCHES MAXIMUM IN. 19 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.