The Screw,close Tolerance, cataloged under National Stock Number 5305-01-285-4926, 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 10 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-285-4926 |
| Primary Part Number | ST3M733-5L5 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.828 INCHES MINIMUM AND 0.858 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 |
| Features Provided | CETYL ALCOHOL LUBRICANT |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.302 INCHES MINIMUM AND 0.322 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 |
|---|---|
| ST3M733-5L5 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M733-5L5 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M733-5L5 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M733-5L5 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| HT4057-5-5A | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M733-5L5 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4057-5-5A | Hi-Shear Corporation (USA) |
| HT4057-5-5A | Huck International, Inc (USA) |
| WC4057-5-5 | West Coast Aerospace, Inc. (USA) |
| HT4057-5-5A | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4057-5-5A | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| HT4057-5-5A | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| ST3M733-5L5 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-285-4926 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-285-4926 has 10 manufacturer part numbers on file: ST3M733-5L5 (Sps Technologies, Llc Dba PB Fasteners), ST3M733-5L5 (Fastener Innovation Technology, Inc. Dba F I T), ST3M733-5L5 (Sps Technologies Ltd, Tj Brooks Division), ST3M733-5L5 (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc), HT4057-5-5A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 5 more.
Key specifications for ST3M733-5L5: Fastener Length: 0.828 INCHES MINIMUM AND 0.858 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. 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.