The Screw,close Tolerance, cataloged under National Stock Number 5305-01-514-3359, 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 18 specifications, cited from the U.S. Government catalog. The record lists 17 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-514-3359 |
| Primary Part Number | ST3M557-4-9 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.015 INCHES NOMINAL IN |
| Fastener Length | 1.031 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Material Document and Classification | AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.562 INCHES NOMINAL IN |
| Grip Diameter | 0.249 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| 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 |
|---|---|
| ST3M557-4-9 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| WC4027-4-9 | West Coast Aerospace, Inc. (USA) |
| ST3M557-4-9 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M557-4-9 | Saturn Fasteners Inc (USA) |
| ST3M557-4-9 | Houston Precision Fasteners I Lp (USA) |
| ST3M557-4-9 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| HT4027-4-9 | Hi-Shear Corporation (USA) |
| ST3M557-4-9 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4027-4-9 | Howmet Global Fastening Systems Inc (USA) |
| HT4027-4-9 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 11923-4-9 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4027-4-9 | Huck International, Inc (USA) |
| ST3M557-4-9 | Camcar Llc Div Camcar Llc (USA) |
| ST3M557-4-9 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4027-4-9 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-4-9 | Heartland Precision Fasteners Inc (USA) |
| ST3M557-4-9 | Linread Ltd (GBR) |
| Reference | Meaning |
|---|---|
| HT4027-4-9 | 5/2 Secondary reference U.S. Government activity |
| HT4027-4-9 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| HT4027-4-9 | 5/9 Secondary reference Sps Technologies Inc |
| HT4027-4-9 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-514-3359 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-514-3359 has 17 manufacturer part numbers on file: ST3M557-4-9 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), WC4027-4-9 (West Coast Aerospace, Inc.), ST3M557-4-9 (The Boeing Company Div Defense), ST3M557-4-9 (Saturn Fasteners Inc), ST3M557-4-9 (Houston Precision Fasteners I Lp) and 12 more.
Key specifications for ST3M557-4-9: Head Height: 0.015 INCHES NOMINAL IN; Fastener Length: 1.031 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.469 INCHES NOMINAL IN. 18 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.