The Screw,close Tolerance, cataloged under National Stock Number 5305-01-337-6983, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 20 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-337-6983 |
| Primary Part Number | HT4075D7-20-90 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| 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 | 1.891 INCHES MINIMUM AND 1.921 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.656 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.437 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Grip Diameter | 0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE 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 | 20 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.810 INCHES MINIMUM AND 0.889 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 |
|---|---|
| HT4075D7-20-90 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4075D7-20-90 PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4075D7-20-90 | 5/9 Secondary reference U.S. Government activity |
| HT4075D7-20-90 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| HT4075D7-20-90 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT4075D7-20-90 | 5/9 Secondary reference U.S. Government activity |
| HT4075D7-20-90 | 5/9 Secondary reference Deutsch Co the |
| HT4075D7-20-90 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-337-6983 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-337-6983 has 2 manufacturer part numbers on file: HT4075D7-20-90 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4075D7-20-90 (Hi-Shear Corporation).
Key specifications for HT4075D7-20-90: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 1.891 INCHES MINIMUM AND 1.921 INCHES MAXIMUM IN. 20 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.