The Screw,close Tolerance, cataloged under National Stock Number 5305-01-563-3402, 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 24 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-563-3402 |
| Primary Part Number | ST3M557-6-10 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.251 INCHES MINIMUM AND 1.281 INCHES MAXIMUM 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 |
|---|---|
| ST3M557-6-10 | Saturn Fasteners Inc (USA) |
| ST3M557-6-10 | Huck International, Inc (USA) |
| ST3M557-6-10 | Howmet Global Fastening Systems Inc (USA) |
| ST3M557-6-10 | Hi-Shear Corporation (USA) |
| ST3M557-6-10 | Linread Ltd (GBR) |
| ST3M557-6-10 | Houston Precision Fasteners I Lp (USA) |
| HT4027-6-10 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4027-6-10 | Howmet Global Fastening Systems Inc (USA) |
| ST3M557-6-10 | Heartland Precision Fasteners Inc (USA) |
| ST3M557-6-10 | West Coast Aerospace, Inc. (USA) |
| 015633402 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M557-6-10 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-6-10 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M557-6-10 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| WC4027-6-10 | West Coast Aerospace, Inc. (USA) |
| ST3M557-6-10 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4027-6-10 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 015633402 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 11923-6-10 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4027-6-10 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M557-6-10 | 5/2 Secondary reference U.S. Government activity |
| 015633402 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| ST3M557-6-10 | 5/2 Secondary reference U.S. Government activity |
| HT4027-6-10 | 5/2 Secondary reference U.S. Government activity |
| HT4027-6-10 | 5/2 Secondary reference U.S. Government activity |
| 015633402 | 5/9 Secondary reference Hi-Shear Corporation |
| 015633402 | 5/9 Secondary reference West Coast Aerospace, Inc. |
| ST3M557-6-10 | 5/9 Secondary reference Reid Products Inc. Dba Reid Products Inc |
| ST3M557-6-10 | 5/9 Secondary reference Swift Ohio Corp |
NSN 5305-01-563-3402 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-563-3402 has 24 manufacturer part numbers on file: ST3M557-6-10 (Saturn Fasteners Inc), ST3M557-6-10 (Huck International, Inc), ST3M557-6-10 (Howmet Global Fastening Systems Inc), ST3M557-6-10 (Hi-Shear Corporation), ST3M557-6-10 (Linread Ltd) and 19 more.
Key specifications for ST3M557-6-10: Fastener Length: 1.251 INCHES MINIMUM AND 1.281 INCHES MAXIMUM 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.