The Screw,close Tolerance, cataloged under National Stock Number 5305-01-266-8397, 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 17 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-266-8397 |
| Primary Part Number | HT4054-3-11A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Fastener Length | 1.011 INCHES MINIMUM AND 1.041 INCHES MAXIMUM IN |
| Thread Length | 0.313 INCHES MINIMUM AND 0.363 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 | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN |
| Grip Diameter | 0.3145 INCHES MINIMUM AND 0.3147 INCHES MAXIMUM IN |
| 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 | 32 |
| Material | STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.339 INCHES MINIMUM AND 0.381 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 |
|---|---|
| HT4054-3-11A PRIMARY | Hi-Shear Corporation (USA) |
| WC4054-3-11A PRIMARY | West Coast Aerospace, Inc. (USA) |
| ST3M730-31 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4054-3-11A PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4054-3-11A PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4054-3-11A | 5/9 Secondary reference U.S. Government activity |
| HT4054-3-11A | 5/9 Secondary reference Sps Technologies Inc |
| HT4054-3-11A | 3/2 Design control — primary reference U.S. Government activity |
| HT4054-3-11A | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HTH054-3-11A | 5/9 Secondary reference U.S. Government activity |
| HT4054-3-11A | 5/9 Secondary reference U.S. Government activity |
| ST3M730-3L11 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-266-8397 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-266-8397 has 5 manufacturer part numbers on file: HT4054-3-11A (Hi-Shear Corporation), WC4054-3-11A (West Coast Aerospace, Inc.), ST3M730-31 (Fastener Innovation Technology, Inc. Dba F I T), HT4054-3-11A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4054-3-11A (Howmet Global Fastening Systems Inc).
Key specifications for HT4054-3-11A: Fastener Length: 1.011 INCHES MINIMUM AND 1.041 INCHES MAXIMUM IN; Thread Length: 0.313 INCHES MINIMUM AND 0.363 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. 17 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.