The Screw,close Tolerance, cataloged under National Stock Number 5305-01-191-4595, 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 18 specifications, cited from the U.S. Government catalog. The record lists 16 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 12 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-191-4595 |
| Primary Part Number | ST3M733-3L12 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.141 INCHES MINIMUM AND 1.171 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-83488,TYPE 2,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Features Provided | CETYL ALCOHOL LUBRICANT |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM AND CHROMATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.338 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 |
|---|---|
| HT4057-3-12A | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M733-3L12 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4057-3-12A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M733-3L12 | Heartland Precision Fasteners Inc (USA) |
| HT4057-3-12A | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M733-3L12 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4057-3-12A | Howmet Global Fastening Systems Inc (USA) |
| HT4057-3-12A | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4057-3-12A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4057-3-12A | Hi-Shear Corporation (USA) |
| ST3M733-3L12 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| 11935-3L12 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M733-3L12 | Houston Precision Fasteners I Lp (USA) |
| HT4057-3-12A | Huck International, Inc (USA) |
| ST3M733-3L12 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| WC4057-3-12 | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| CHT4057-3-12 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| HT4057-3-12A | 5/9 Secondary reference U.S. Government activity |
| HT4057-3-12 | 5/9 Secondary reference U.S. Government activity |
| HT4057-3-12 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| ST3M733-3-12 | 5/9 Secondary reference The Boeing Company Div Defense |
| HT4057-3-12A | 5/9 Secondary reference Sps Technologies Inc |
| HT4057-3-12A | 5/2 Secondary reference U.S. Government activity |
| HT4057-3-12A | 5/9 Secondary reference U.S. Government activity |
| HT4057-3-12 | 5/9 Secondary reference Huck International, Inc |
| HT4057-3-12 | 5/9 Secondary reference U.S. Government activity |
| HT4057-3-12 | 5/9 Secondary reference U.S. Government activity |
| HT4057-3-12 | 5/9 Secondary reference Hi-Shear Corporation |
NSN 5305-01-191-4595 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-191-4595 has 16 manufacturer part numbers on file: HT4057-3-12A (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), ST3M733-3L12 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), HT4057-3-12A (Sps Technologies, Llc Dba PB Fasteners), ST3M733-3L12 (Heartland Precision Fasteners Inc), HT4057-3-12A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 11 more.
Key specifications for ST3M733-3L12: Fastener Length: 1.141 INCHES MINIMUM AND 1.171 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-C-83488,TYPE 2,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN; Material Document and Classification: AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.