The Screw,close Tolerance, cataloged under National Stock Number 5305-01-308-9250, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-308-9250 |
| Primary Part Number | HT8137-3-5ASM |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Head Height | 0.044 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN |
| Fastener Length | 0.703 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN |
| Thread Length | 0.381 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Features Provided | O RING AND DRY FILM LUBRICANT AND CETYL ALCOHOL LUBRICANT |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | TITANIUM ALLOY UNS R56400 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.376 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 |
|---|---|
| ST3M430V3-5ASM | Houston Precision Fasteners I Lp (USA) |
| HT271A3-5M | Hi-Shear Corporation (USA) |
| HT271A3-5M | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| S53M430V3-5ASM | West Coast Aerospace, Inc. (USA) |
| ST3M430V3-5ASM | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT8137-3-5ASM PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| 110179-3-5ASM | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| Reference | Meaning |
|---|---|
| BM33024V3-5M | 5/9 Secondary reference Huck International, Inc |
| 110179-3-5ASM | 5/9 Secondary reference U.S. Government activity |
| ST3M430V3-5ASM | 5/2 Secondary reference U.S. Government activity |
| HT8137-3-5ASM | 5/9 Secondary reference U.S. Government activity |
| ST3M430V3-5ASM | 5/9 Secondary reference U.S. Government activity |
| ST3M4 | 5/9 Secondary reference Sps Technologies Inc |
| ST3M430V3-5ASM | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 110179-3-5ASM | 5/9 Secondary reference Sps Technologies Inc |
| BM33024V3-5M | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-308-9250 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-308-9250 has 7 manufacturer part numbers on file: ST3M430V3-5ASM (Houston Precision Fasteners I Lp), HT271A3-5M (Hi-Shear Corporation), HT271A3-5M (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), S53M430V3-5ASM (West Coast Aerospace, Inc.), ST3M430V3-5ASM (Fastener Innovation Technology, Inc. Dba F I T) and 2 more.
Key specifications for HT8137-3-5ASM: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.044 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN; Fastener Length: 0.703 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN. 19 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.