The Screw,close Tolerance, cataloged under National Stock Number 5305-01-103-5732, 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 16 specifications, cited from the U.S. Government catalog. The record lists 9 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-103-5732 |
| Primary Part Number | HT271A4-11 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Head Height | 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Fastener Length | 1.140 INCHES MINIMUM AND 1.187 INCHES MAXIMUM IN |
| Thread Length | 0.442 INCHES MINIMUM AND 0.509 INCHES MAXIMUM IN |
| Material Document and Classification | NAS621 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | TITANIUM ALLOY UNS R54520 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.5066 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 |
|---|---|
| HT271A4-11 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT8137-4-11AS PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M430V4-11AS | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| ST3M430V4-11AS | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| BM33024V4-11U PRIMARY | Huck International, Inc (USA) |
| 110179-4-11AS | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT271A4-11 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M430V4-11AS | Houston Precision Fasteners I Lp (USA) |
| WC8137-4-11A | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| ST3M430V4-11AS | 5/9 Secondary reference U.S. Government activity |
| BM33024V4-11U | 5/9 Secondary reference U.S. Government activity |
| 10115016 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 110179-4-11AS | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 110179-4-11AS | 3/2 Design control — primary reference U.S. Government activity |
| HT8137-4-11AS | 5/9 Secondary reference U.S. Government activity |
| ST3M430V4-11AS | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-103-5732 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-103-5732 has 9 manufacturer part numbers on file: HT271A4-11 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT8137-4-11AS (Howmet Global Fastening Systems Inc), ST3M430V4-11AS (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc), ST3M430V4-11AS (Fastener Innovation Technology, Inc. Dba F I T), BM33024V4-11U (Huck International, Inc) and 4 more.
Key specifications for HT271A4-11: Head Height: 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN; Fastener Length: 1.140 INCHES MINIMUM AND 1.187 INCHES MAXIMUM IN; Thread Length: 0.442 INCHES MINIMUM AND 0.509 INCHES MAXIMUM IN; Material Document and Classification: NAS621 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 16 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.