The Screw,close Tolerance, cataloged under National Stock Number 5305-01-193-6845, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 14 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-193-6845 |
| Primary Part Number | ST3M430V4-3AS |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Head Height | 0.0713 INCHES MINIMUM AND 0.0733 INCHES MAXIMUM IN |
| Fastener Length | 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN |
| Thread Length | 0.442 INCHES MINIMUM AND 0.509 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 4967,COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL V |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.178 INCHES MINIMUM AND 0.198 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 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.5018 INCHES MINIMUM AND 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 |
|---|---|
| ST3M430V4-3AS PRIMARY | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| ST3M430V4-3AS | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M430V4-3AS PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HT271A4-3 | 5/9 Secondary reference Hi-Shear Corporation |
| BM33024V4-3U | 5/9 Secondary reference Huck International, Inc |
| 110179-4-3AS | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT8137-4-3AS | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| ST3M430V4-3AS | 5/9 Secondary reference West Coast Aerospace, Inc. |
| 110179-4-3AS | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT271A4-3 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| HT8137-4-3AS | 5/9 Secondary reference U.S. Government activity |
| 110179-4-3AS | 5/9 Secondary reference U.S. Government activity |
| WC8137-4-3A | C/1 Advisory reference — outside the item-of-supply concept West Coast Aerospace, Inc. |
| 110179-4-3AS | 5/9 Secondary reference U.S. Government activity |
| ST3M430V4-3AS | 5/9 Secondary reference Sps Technologies Ltd, Tj Brooks Division |
| BM33024V4-3U | 5/9 Secondary reference U.S. Government activity |
| ST3M430V4-3AS | 5/9 Secondary reference Houston Precision Fasteners I Lp |
NSN 5305-01-193-6845 is a Screw,close Tolerance, manufactured by Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-193-6845 has 3 manufacturer part numbers on file: ST3M430V4-3AS (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc), ST3M430V4-3AS (Fastener Innovation Technology, Inc. Dba F I T), ST3M430V4-3AS (The Boeing Company Div Defense).
Key specifications for ST3M430V4-3AS: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.0713 INCHES MINIMUM AND 0.0733 INCHES MAXIMUM IN; Fastener Length: 0.640 INCHES MINIMUM AND 0.687 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.