The Screw,close Tolerance, cataloged under National Stock Number 5305-01-280-6738, 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 23 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-280-6738 |
| Primary Part Number | ST3M730-3L7 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 23.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 0.761 INCHES MINIMUM AND 0.791 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-83488 TY 2 CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.313 INCHES MINIMUM AND 0.363 INCHES MAXIMUM IN |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | MIL-C-6049 MIL SPEC 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 | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN |
| Grip Diameter | 0.3145 INCHES MINIMUM AND 0.3147 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 180000 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 | 32 |
| Material | STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.339 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 |
|---|---|
| HT4054-3-7A | Houston Precision Fasteners I Lp (USA) |
| HT4054-3-7A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M730-3L7 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4054-3-7A | Howmet Global Fastening Systems Inc (USA) |
| HT4054-3-7A | Hi-Shear Corporation (USA) |
| HT4054-3-7A | West Coast Aerospace, Inc. (USA) |
| HT4054-3-7A | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| Reference | Meaning |
|---|---|
| HT4054-3-7A | 5/9 Secondary reference U.S. Government activity |
| HT4054-3-7A | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| ST3M730-3L7 | 5/9 Secondary reference Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc |
| HT4054-3-7A | 5/2 Secondary reference U.S. Government activity |
| HT4054-3-7A | 5/9 Secondary reference U.S. Government activity |
| 10113637 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5305-01-280-6738 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-280-6738 has 7 manufacturer part numbers on file: HT4054-3-7A (Houston Precision Fasteners I Lp), HT4054-3-7A (Fastener Innovation Technology, Inc. Dba F I T), ST3M730-3L7 (The Boeing Company Div Defense), HT4054-3-7A (Howmet Global Fastening Systems Inc), HT4054-3-7A (Hi-Shear Corporation) and 2 more.
Key specifications for ST3M730-3L7: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 23.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 0.761 INCHES MINIMUM AND 0.791 INCHES MAXIMUM IN. 23 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.