The Screw,close Tolerance, cataloged under National Stock Number 5305-01-298-7765, 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 17 specifications, cited from the U.S. Government catalog. The record lists 12 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-298-7765 |
| Primary Part Number | 3M939-4-8F |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.954 INCHES MINIMUM AND 0.984 INCHES MAXIMUM IN |
| Thread Length | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Features Provided | CETYL ALCOHOL LUBRICANT |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM OVERALL |
| Minimum Tensile Strength | 125000 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 | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.3898 INCHES MINIMUM AND 0.3948 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 |
|---|---|
| HR248-4-8BJ | Hi-Shear Corporation (USA) |
| 3M939-4-8F | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 3M939-4-8F | West Coast Aerospace, Inc. (USA) |
| 3M939-4-8F | Heartland Precision Fasteners Inc (USA) |
| GS1018-4-8P | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| AIC939-4-8P | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HR248-4-8BJ | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| SC5087-4-8P | Howmet Global Fastening Systems Inc (USA) |
| 3M939-4-8F PRIMARY | The Boeing Company Div Defense (USA) |
| 3M939-4-8F | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M939-4-8F | Houston Precision Fasteners I Lp (USA) |
| 3M939-4-8F | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| 3M939-4-8F | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| 3M939-4-8F | 5/2 Secondary reference U.S. Government activity |
| SC1823-4-8P | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| VT1731-4-8P | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-298-7765 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-298-7765 has 12 manufacturer part numbers on file: HR248-4-8BJ (Hi-Shear Corporation), 3M939-4-8F (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), 3M939-4-8F (West Coast Aerospace, Inc.), 3M939-4-8F (Heartland Precision Fasteners Inc), GS1018-4-8P (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace) and 7 more.
Key specifications for 3M939-4-8F: Fastener Length: 0.954 INCHES MINIMUM AND 0.984 INCHES MAXIMUM IN; Thread Length: 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.250 INCHES IN; Features Provided: CETYL ALCOHOL LUBRICANT. 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.