The Screw,close Tolerance, cataloged under National Stock Number 5305-01-131-6730, 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 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-131-6730 |
| Primary Part Number | ST3M740-5L9 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.078 INCHES MINIMUM AND 1.108 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 |
| 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 | 0.312 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Grip Diameter | 0.3110 INCHES MINIMUM AND 0.3120 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 | 24 |
| Material | STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.469 INCHES MINIMUM AND 0.474 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 |
|---|---|
| ST3M740-5L9 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M740-5-9 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M740-5L9 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M740-5L9 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4053-5-9A | 3/2 Design control — primary reference U.S. Government activity |
| 10115288 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| HT4053-5-9A | C/1 Advisory reference — outside the item-of-supply concept Hi-Shear Corporation |
| HT4053-5-9A | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| HT4053-5-9A | 5/9 Secondary reference U.S. Government activity |
| HT4053-5-9A | 5/9 Secondary reference U.S. Government activity |
| ST3M740-5L9 | 5/2 Secondary reference U.S. Government activity |
| HT4053-5-9A | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
NSN 5305-01-131-6730 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-131-6730 has 4 manufacturer part numbers on file: ST3M740-5L9 (The Boeing Company Div Defense), ST3M740-5-9 (The Boeing Company Div Defense), ST3M740-5L9 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M740-5L9 (Hi-Shear Corporation).
Key specifications for ST3M740-5L9: Fastener Length: 1.078 INCHES MINIMUM AND 1.108 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; Hardness Rating: 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM 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.