The Screw,close Tolerance, cataloged under National Stock Number 5305-01-240-7397, 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 21 specifications, cited from the U.S. Government catalog. The record lists 14 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-240-7397 |
| Primary Part Number | 3M925C4-20A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Head Height | 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Fastener Length | 1.704 INCHES MINIMUM AND 1.734 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-83488 TY 2 CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM AND CHROMATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.501 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 |
|---|---|
| 3M925C4-20A | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M925C4-20A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 3M925C4-20A | West Coast Aerospace, Inc. (USA) |
| 3M925C4-20A | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 3M925C4-20A | Heartland Precision Fasteners Inc (USA) |
| 3M925C4-20A | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 3M925C4-20A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M925C4-20A | Reid Products Inc. Dba Reid Products Inc (USA) |
| 3M925C4-20A | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| 3M925C4-20A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3M925C4-20A | Howmet Global Fastening Systems Inc (USA) |
| 3M925C4-20A | Houston Precision Fasteners I Lp (USA) |
| 3M925C4-20A | Hi-Shear Corporation (USA) |
| 3M925C4-20A PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 3M925C4-20A | 5/9 Secondary reference Sps Technologies Inc |
| HT4067-4-20A | 5/9 Secondary reference U.S. Government activity |
| 642AS1631-8 | 5/9 Secondary reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| 3M925C4-20A | 5/2 Secondary reference U.S. Government activity |
| HT4067-4-20A | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 3M925C4-20A | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-240-7397 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-240-7397 has 14 manufacturer part numbers on file: 3M925C4-20A (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 3M925C4-20A (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 3M925C4-20A (West Coast Aerospace, Inc.), 3M925C4-20A (Valley-Todeco, Inc. Dba Arconic Fastening Systems), 3M925C4-20A (Heartland Precision Fasteners Inc) and 9 more.
Key specifications for 3M925C4-20A: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.071 INCHES MINIMUM AND 0.073 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.