The Screw,close Tolerance, cataloged under National Stock Number 5305-01-308-0170, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 19 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-308-0170 |
| Primary Part Number | ST3M430V3-4ASM |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| 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 | 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN |
| Thread Length | 0.380 INCHES MINIMUM AND 0.447 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 | 0.240 INCHES MINIMUM AND 0.260 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 |
|---|---|
| HT271A3-4M | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BM33024V3-4UM | Huck International, Inc (USA) |
| ST3M430V3-4ASM PRIMARY | The Boeing Company Div Defense (USA) |
| 110179-3-4ASM | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M430V3-4ASM | Houston Precision Fasteners I Lp (USA) |
| HT271A3-4M | Hi-Shear Corporation (USA) |
| WC8137-3-4AM | West Coast Aerospace, Inc. (USA) |
| ST3M430V3-4ASM | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT8137-3-4ASM | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| BM33024V3-4M | 5/9 Secondary reference Huck International, Inc |
| HT8137-3-4ASM | 5/9 Secondary reference U.S. Government activity |
| STM430V3-4ASM | 5/9 Secondary reference The Boeing Company Div Defense |
| 110179-3-4ASM | 5/2 Secondary reference U.S. Government activity |
| BM33024V3-4M | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-308-0170 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-308-0170 has 9 manufacturer part numbers on file: HT271A3-4M (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), BM33024V3-4UM (Huck International, Inc), ST3M430V3-4ASM (The Boeing Company Div Defense), 110179-3-4ASM (Sps Technologies Ltd, Tj Brooks Division), ST3M430V3-4ASM (Houston Precision Fasteners I Lp) and 4 more.
Key specifications for ST3M430V3-4ASM: 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: 0.640 INCHES MINIMUM AND 0.687 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.