The Screw,close Tolerance, cataloged under National Stock Number 5305-01-135-6493, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 21 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through both NSN and commercial part number lookups. 13 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-135-6493 |
| Primary Part Number | ST3M730-3L3 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 0.511 INCHES MINIMUM AND 0.541 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-83488 TYPE 2 CLASS 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-S-6049 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM 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 |
|---|---|
| ST3M730-3L3 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M730-3L3 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M730-3L3 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M730-3L3 PRIMARY | West Coast Aerospace, Inc. (USA) |
| ST3M730-3L3 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M730-3L3 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M730-3L3 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4054-3-3A | 5/9 Secondary reference Hi-Shear Corporation |
| HT4054-3-3A | 5/9 Secondary reference U.S. Government activity |
| ST3M730-3L3 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| WC4054-33A | C/1 Advisory reference — outside the item-of-supply concept West Coast Aerospace, Inc. |
| HT4054-3-3A | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| ST3M730-3L3 | 3/2 Design control — primary reference U.S. Government activity |
| HT4054-3-3A | 5/9 Secondary reference U.S. Government activity |
| HT4054-3-3A | 5/9 Secondary reference U.S. Government activity |
| HT4054-3-3A | 5/9 Secondary reference Huck International, Inc |
| ST3M730-3-3 | 5/9 Secondary reference The Boeing Company Div Defense |
| ST3M730-3L3 | 3/2 Design control — primary reference U.S. Government activity |
| 10115379 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| ST3M730-3L3 | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-135-6493 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-135-6493 has 7 manufacturer part numbers on file: ST3M730-3L3 (Hi-Shear Corporation), ST3M730-3L3 (Howmet Global Fastening Systems Inc), ST3M730-3L3 (Fastener Innovation Technology, Inc. Dba F I T), ST3M730-3L3 (West Coast Aerospace, Inc.), ST3M730-3L3 (Sps Technologies Ltd, Tj Brooks Division) and 2 more.
Key specifications for ST3M730-3L3: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 0.511 INCHES MINIMUM AND 0.541 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-C-83488 TYPE 2 CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 21 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.