The Screw,close Tolerance, cataloged under National Stock Number 5305-01-129-6940, 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 21 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 21 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-129-6940 |
| Primary Part Number | HT4054-4-6A |
| 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 |
| Fastener Length | 0.785 INCHES MINIMUM AND 0.815 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-83488 TYPE 2 CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.400 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | MIL-S-6049 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 180000 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 8740 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.464 INCHES MINIMUM AND 0.506 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 |
|---|---|
| HT4054-4-6A | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4054-4-6A | 5/2 Secondary reference U.S. Government activity |
| WC4054-4-6A | 5/9 Secondary reference West Coast Aerospace, Inc. |
| ST3M730-4L6 | 5/9 Secondary reference Houston Precision Fasteners I Lp |
| HT4054-4-6 | 5/9 Secondary reference Hi-Shear Corporation |
| ST3M730-4L6 | 5/9 Secondary reference Fastener Innovation Technology, Inc. Dba F I T |
| ST3M730-4L6 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| HT4054-4-6A | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| HT4054-4-6 | 5/9 Secondary reference U.S. Government activity |
| 3036AS190-4L6 | 5/9 Secondary reference Klune Industries, Inc. Div Pcc Aerostructures, Spanish Fork Dba Klune Industries |
| ST3M730-4L6 | 5/9 Secondary reference The Boeing Company Div Defense |
| ST3M730-4L6 | 5/9 Secondary reference Sps Technologies Ltd, Tj Brooks Division |
| HT4054-4-6A | 5/2 Secondary reference U.S. Government activity |
| HT4054-4-6 | 5/9 Secondary reference U.S. Government activity |
| 3036AS190-4L6 | 3/1 Design control — primary reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| HT4054-4-6A | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| 3036AS190-4L6 | 5/9 Secondary reference Marvin Engineering Co, Inc |
| HT4054-4-6A | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT4054-4-6A | 5/9 Secondary reference U.S. Government activity |
| ST3M730-4-6 | 5/9 Secondary reference The Boeing Company Div Defense |
| ST3M730-4L6 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-129-6940 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-129-6940 has 1 manufacturer part number on file: HT4054-4-6A (Hi-Shear Corporation).
Key specifications for HT4054-4-6A: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 0.785 INCHES MINIMUM AND 0.815 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-C-83488 TYPE 2 CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 21 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.