The Screw,close Tolerance, cataloged under National Stock Number 5305-01-327-9688, 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-327-9688 |
| Primary Part Number | HR240-4-10A |
| 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 |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 1.035 INCHES MINIMUM AND 1.065 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | NAS4006 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Material Document and Classification | AMS4928 ASSN STD SINGLE MATERIAL RESPONSE OR AMS4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM OVERALL |
| 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 |
|---|---|
| HR240-4-10A | Hi-Shear Corporation (USA) |
| 03A174-4-10A | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems (USA) |
| SLB146-4-10A | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| HR240-4-10A | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| SC3102-4-10A | Howmet Global Fastening Systems Inc (USA) |
| AIC1652-4-10A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| PBF1417-4-10A | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 12743-4-10A | 5/9 Secondary reference U.S. Government activity |
| T009-4-10A | 5/9 Secondary reference U.S. Government activity |
| T009-4-10A | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 123743-4-10A | 3/2 Design control — primary reference U.S. Government activity |
| 03A174-4-10A | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
| PBP1417-4-10A | 5/9 Secondary reference Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| 03A174-4-10A | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector |
| SC3102-4-10A | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-327-9688 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-327-9688 has 7 manufacturer part numbers on file: HR240-4-10A (Hi-Shear Corporation), 03A174-4-10A (Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems), SLB146-4-10A (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok), HR240-4-10A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), SC3102-4-10A (Howmet Global Fastening Systems Inc) and 2 more.
Key specifications for HR240-4-10A: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 1.035 INCHES MINIMUM AND 1.065 INCHES MAXIMUM IN. 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.