The Screw,close Tolerance, cataloged under National Stock Number 5305-01-074-9045, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-074-9045 |
| Primary Part Number | ST3M559-5-12 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Fastener Length | 1.217 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MAC PS-13145 FSCM 76301 MFR REF ALL TREATMENT RESPONSES OVERALL |
| Thread Length | 0.467 INCHES NOMINAL IN |
| Hardness Rating | 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Single Shear Strength | ERR-060 |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.750 INCHES NOMINAL IN |
| Grip Diameter | 0.3266 INCHES MINIMUM AND 0.3276 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.625 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 |
|---|---|
| ST3M559-5-12 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M559-5-12 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HS2623-5-12 | Huck International, Inc (USA) |
| ST3M559-5-12 | Howmet Global Fastening Systems Inc (USA) |
| ST3M559-5-12 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| ST3M559-5-12 | 5/9 Secondary reference U.S. Government activity |
| 66908H5-12 | 3/2 Design control — primary reference U.S. Government activity |
| HT307-5-12 | 5/9 Secondary reference Foster Bros Mfg Co |
| ST3M559-5-12 | 5/9 Secondary reference U.S. Government activity |
| ST3M559-5-12 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 66908H5-12 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HS2623-5-12 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-074-9045 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-074-9045 has 5 manufacturer part numbers on file: ST3M559-5-12 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M559-5-12 (Sps Technologies, Llc Dba PB Fasteners), HS2623-5-12 (Huck International, Inc), ST3M559-5-12 (Howmet Global Fastening Systems Inc), ST3M559-5-12 (Hi-Shear Corporation).
Key specifications for ST3M559-5-12: Fastener Length: 1.217 INCHES NOMINAL IN; Surface Treatment Document and Classification: MAC PS-13145 FSCM 76301 MFR REF ALL TREATMENT RESPONSES OVERALL; Thread Length: 0.467 INCHES NOMINAL IN; Hardness Rating: 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL. 20 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.