The Screw,close Tolerance, cataloged under National Stock Number 5305-01-254-1365, 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 9 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 18 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-254-1365 |
| Primary Part Number | ST3M733-5L8 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.016 INCHES MINIMUM AND 1.046 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-83488 TY 2 CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.506 INCHES MINIMUM AND 0.556 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Grip Diameter | 0.3110 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.575 INCHES MINIMUM AND 0.635 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 |
|---|---|
| HT4057-5-8A | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4057-5-8A | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M733-5L8 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4057-5-8A | Howmet Global Fastening Systems Inc (USA) |
| ST3M733-5L8 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4057-5-8A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4057-5-8A | Hi-Shear Corporation (USA) |
| HT4057-5-8A | Huck International, Inc (USA) |
| WC4057-5-8 | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| HT4057-5L-8 | 5/9 Secondary reference U.S. Government activity |
| ST3M733 | D/9 Drawing number reference only The Boeing Company Div Defense |
| HT4057-5L-8 | 5/9 Secondary reference U.S. Government activity |
| HT4057-5L-8 | 5/9 Secondary reference Sps Technologies Ltd, Tj Brooks Division |
| HT4057-5L-8 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| HT4057-5-8A | 5/2 Secondary reference U.S. Government activity |
| HT4057-5L-8 | 5/9 Secondary reference U.S. Government activity |
| HT4057-5L-8A | 5/9 Secondary reference Kwa Associates Inc |
| HT4057-5L-8 | 5/9 Secondary reference Huck International, Inc |
| HT4057-5L-8A | 5/9 Secondary reference U.S. Government activity |
| HT4057-5L-8A | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| HT4057-5L-8A | 5/9 Secondary reference Sps Technologies Ltd, Tj Brooks Division |
| HT4057-5L-8A | 5/9 Secondary reference Huck International, Inc |
| HT4057-5L-8A | 5/9 Secondary reference Hi-Shear Corporation |
| HT4057-5L-8A | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4057-5L-8 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4057-5L-8 | 5/9 Secondary reference Hi-Shear Corporation |
| HT4057-5L-8 | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-254-1365 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-254-1365 has 9 manufacturer part numbers on file: HT4057-5-8A (Sps Technologies Ltd, Tj Brooks Division), HT4057-5-8A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M733-5L8 (The Boeing Company Div Defense), HT4057-5-8A (Howmet Global Fastening Systems Inc), ST3M733-5L8 (Fastener Innovation Technology, Inc. Dba F I T) and 4 more.
3 possible matches (shared part number, not a government interchangeability claim): 5305-01-723-3191, 5305-01-725-0777, 5305-01-727-5710. Verify interchangeability with system specifications before substitution.
Key specifications for ST3M733-5L8: Fastener Length: 1.016 INCHES MINIMUM AND 1.046 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-C-83488 TY 2 CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.506 INCHES MINIMUM AND 0.556 INCHES MAXIMUM IN; Material Document and Classification: AMS 5629 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.