The Screw,close Tolerance, cataloged under National Stock Number 5305-01-563-4007, 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 15 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-563-4007 |
| Primary Part Number | ST3M557-6-14 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.509 INCHES NOMINAL IN |
| Thread Length | 0.641 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Grip Diameter | 0.374 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.564 INCHES NOMINAL 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 |
|---|---|
| ST3M557-6-14 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4027-6-14 | Hi-Shear Corporation (USA) |
| ST3M557-6-14 | Saturn Fasteners Inc (USA) |
| 11923-6-14 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M557-6-14 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M557-6-14 | Camcar Llc Div Camcar Llc (USA) |
| ST3M557-6-14 | Linread Ltd (GBR) |
| HT4027-6-14 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-6-14 | Houston Precision Fasteners I Lp (USA) |
| HT4027-6-14 | Howmet Global Fastening Systems Inc (USA) |
| WC4027-6-14 | West Coast Aerospace, Inc. (USA) |
| HT4027-6-14 | Huck International, Inc (USA) |
| ST3M557-6-14 | Heartland Precision Fasteners Inc (USA) |
| ST3M557-6-14 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| HT4027-6-14 | 5/2 Secondary reference U.S. Government activity |
| HT4027-6-14 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-563-4007 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-563-4007 has 14 manufacturer part numbers on file: ST3M557-6-14 (The Boeing Company Div Defense), HT4027-6-14 (Hi-Shear Corporation), ST3M557-6-14 (Saturn Fasteners Inc), 11923-6-14 (Reid Products Inc. Dba Reid Products Inc), ST3M557-6-14 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 9 more.
Key specifications for ST3M557-6-14: Fastener Length: 1.509 INCHES NOMINAL IN; Thread Length: 0.641 INCHES NOMINAL IN; Nominal Thread Diameter: 0.375 INCHES IN; Head Style: OVAL COUNTERSUNK. 15 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.