The Screw,close Tolerance, cataloged under National Stock Number 5305-01-129-6935, 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 18 specifications, cited from the U.S. Government catalog. The record lists 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-129-6935 |
| Primary Part Number | HT271A6-14 |
| 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 |
| Head Height | 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN |
| Fastener Length | 1.500 INCHES MINIMUM AND 1.547 INCHES MAXIMUM IN |
| Thread Length | 0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN |
| Material Document and Classification | NAS621 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | TITANIUM ALLOY UNS R54520 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.756 INCHES MINIMUM AND 0.760 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 |
|---|---|
| WC8137-6-14A | West Coast Aerospace, Inc. (USA) |
| ST3M430V6-14AS | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M430V6-14AS | Houston Precision Fasteners I Lp (USA) |
| HT8137-6-14AS | Howmet Global Fastening Systems Inc (USA) |
| BM33024V6-14U | Huck International, Inc (USA) |
| HT271A6-14 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 110179-6-14AS | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M430V6-14AS PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M430V6-14AS | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| HT271A6-14 PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| 110179-6-14AS | 3/2 Design control — primary reference U.S. Government activity |
| 10115204 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| ST3M430V6-14AS | 5/2 Secondary reference U.S. Government activity |
| BM33024V6-14U | 5/9 Secondary reference U.S. Government activity |
| HT8137-6-14AS | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-129-6935 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-129-6935 has 10 manufacturer part numbers on file: WC8137-6-14A (West Coast Aerospace, Inc.), ST3M430V6-14AS (Fastener Innovation Technology, Inc. Dba F I T), ST3M430V6-14AS (Houston Precision Fasteners I Lp), HT8137-6-14AS (Howmet Global Fastening Systems Inc), BM33024V6-14U (Huck International, Inc) and 5 more.
Key specifications for HT271A6-14: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN; Fastener Length: 1.500 INCHES MINIMUM AND 1.547 INCHES MAXIMUM IN. 18 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.