The Screw,close Tolerance, cataloged under National Stock Number 5305-01-536-0106, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 8 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-536-0106 |
| Primary Part Number | ST3M557-4-6 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Fastener Length | 0.829 INCHES MINIMUM AND 0.859 INCHES MAXIMUM IN |
| Thread Length | 0.406 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Grip Diameter | 0.249 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 | 28 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.390 INCHES MINIMUM AND 0.395 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 |
|---|---|
| 11923-4-6 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M557-4-6 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M557-4-6 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M557-4-6 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M557-4-6 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| ST3M557-4-6 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M557-4-6 PRIMARY | West Coast Aerospace, Inc. (USA) |
| ST3M557-4-6 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M557-4-6 | 3/2 Design control — primary reference U.S. Government activity |
| ST3M557-4-6 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-536-0106 is a Screw,close Tolerance, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-536-0106 has 8 manufacturer part numbers on file: 11923-4-6 (Reid Products Inc. Dba Reid Products Inc), ST3M557-4-6 (Sps Technologies, Llc Dba PB Fasteners), ST3M557-4-6 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M557-4-6 (Hi-Shear Corporation), ST3M557-4-6 (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc) and 3 more.
Key specifications for ST3M557-4-6: Fastener Length: 0.829 INCHES MINIMUM AND 0.859 INCHES MAXIMUM IN; Thread Length: 0.406 INCHES NOMINAL IN; Nominal Thread Diameter: 0.250 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.