The Screw,close Tolerance, cataloged under National Stock Number 5305-01-330-7579, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-330-7579 |
| Primary Part Number | SC3102-4-28 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES OVERALL |
| Fastener Length | 2.160 INCHES MINIMUM AND 2.190 INCHES MAXIMUM IN |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Material Document and Classification | AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.740 INCHES MINIMUM AND 1.760 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | TITANIUM ALLOY UNS R56400 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.449 INCHES MINIMUM AND 0.507 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 |
|---|---|
| SC3102-4-28 | Howmet Global Fastening Systems Inc (USA) |
| HR240-4-28 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| AIC1652-4-28 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| PBF1417-4-28 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| SLB146-4-28 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| 03A174-4-28 | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems (USA) |
| T009-4-28 | Huck International, Inc (USA) |
| HR240-4-28 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| 123743-4-28 | 5/2 Secondary reference U.S. Government activity |
| 03A174-4-28 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector |
| 03A174-4-28 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
| SC3102-4-28 | 5/9 Secondary reference Sps Technologies Inc |
| T009-4-28 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-330-7579 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-330-7579 has 8 manufacturer part numbers on file: SC3102-4-28 (Howmet Global Fastening Systems Inc), HR240-4-28 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), AIC1652-4-28 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), PBF1417-4-28 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), SLB146-4-28 (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok) and 3 more.
Key specifications for SC3102-4-28: Surface Finish: 32.0 MICROINCHES OVERALL; Fastener Length: 2.160 INCHES MINIMUM AND 2.190 INCHES MAXIMUM IN; Thread Length: 0.425 INCHES NOMINAL IN; Material Document and Classification: AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 17 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.