The Screw,close Tolerance, cataloged under National Stock Number 5305-01-182-4279, 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 21 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 12 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-182-4279 |
| Primary Part Number | HT4054-4-38A |
| 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 |
| Fastener Length | 2.785 INCHES MINIMUM AND 2.815 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-83488,TY 2,CL 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 | 2.365 INCHES MINIMUM AND 2.385 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 |
|---|---|
| HT4054-4-38A | Triman Industries Inc (USA) |
| HT4054-4-38A PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4054-4-38A PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4054-4-38A | 5/9 Secondary reference U.S. Government activity |
| WC4054-438A | C/1 Advisory reference — outside the item-of-supply concept West Coast Aerospace, Inc. |
| HT4054-4-38A | 5/9 Secondary reference U.S. Government activity |
| ST3M730-4-38 | 5/9 Secondary reference The Boeing Company Div Defense |
| HT4054-4-38 | 5/9 Secondary reference Hi-Shear Corporation |
| HT4054-4-38A | 3/2 Design control — primary reference U.S. Government activity |
| ST3M730-4L38 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4054-4-38 | 5/9 Secondary reference U.S. Government activity |
| HLT4054-4-38A | 5/9 Secondary reference U.S. Government activity |
| HT4054-4-38 | 5/9 Secondary reference U.S. Government activity |
| HT4054-38A | 5/9 Secondary reference U.S. Government activity |
| 10115554 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5305-01-182-4279 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-182-4279 has 3 manufacturer part numbers on file: HT4054-4-38A (Triman Industries Inc), HT4054-4-38A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4054-4-38A (Hi-Shear Corporation).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-241-5079. Verify interchangeability with system specifications before substitution.
Key specifications for HT4054-4-38A: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 2.785 INCHES MINIMUM AND 2.815 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-C-83488,TY 2,CL 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.