The Screw,close Tolerance, cataloged under National Stock Number 5305-01-725-0777, 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 22 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-725-0777 |
| Primary Part Number | ST3M733-4L17 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Point Length | 0.045 INCHES NOMINAL IN |
| Fastener Length | 1.5165 INCHES MINIMUM AND 1.5465 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-DTL-83488, TYPE II, CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Material Document and Classification | PH-13-8MO CRES PER AMS 5629 AEROSPACE MATERIAL SPEC STD SINGLE MATERIAL RESPONSE OVERALL |
| Point Chamfer Angle | 45.0 DEGREES NOMINAL |
| Single Shear Strength | ERR-060 |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Features Provided | CETYL ALCOHOL LUBRICANT |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Point Style | FLAT |
| Grip Length | 1.0525 INCHES MINIMUM AND 1.0725 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 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 | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.456 INCHES MINIMUM AND 0.508 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 |
|---|---|
| HT4057-4-17A | Howmet Global Fastening Systems Inc (USA) |
| 11935-4L17 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M733-4L17 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4057-4-17A | Hi-Shear Corporation (USA) |
| WC4057-4-17 | West Coast Aerospace, Inc. (USA) |
| HT4057-4-17A | Huck International, Inc (USA) |
| ST3M733-4L17 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M733-4L17 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M733-4L17 | Heartland Precision Fasteners Inc (USA) |
| ST3M733-4L17 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4057-4-17A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4057-4-17A | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M733-4L17 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| ST3M733-4L17 | Houston Precision Fasteners I Lp (USA) |
| ST3M733-4L17 | Briles Aerospace, Llc (USA) |
| HT4057-4-17A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| HT4057-4-17A | 5/2 Secondary reference U.S. Government activity |
| HT4057-4-17A | 5/2 Secondary reference U.S. Government activity |
| ST3M733 | D/9 Drawing number reference only The Boeing Company Div Defense |
NSN 5305-01-725-0777 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-725-0777 has 16 manufacturer part numbers on file: HT4057-4-17A (Howmet Global Fastening Systems Inc), 11935-4L17 (Reid Products Inc. Dba Reid Products Inc), ST3M733-4L17 (The Boeing Company Div Defense), HT4057-4-17A (Hi-Shear Corporation), WC4057-4-17 (West Coast Aerospace, Inc.) and 11 more.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-727-5710. Verify interchangeability with system specifications before substitution.
Key specifications for ST3M733-4L17: Point Length: 0.045 INCHES NOMINAL IN; Fastener Length: 1.5165 INCHES MINIMUM AND 1.5465 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-DTL-83488, TYPE II, CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.469 INCHES NOMINAL IN. 22 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.