The Screw,close Tolerance, cataloged under National Stock Number 5305-01-514-4084, 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 17 specifications, cited from the U.S. Government catalog. The record lists 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-514-4084 |
| Primary Part Number | ST3M557-7-16 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.656 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.656 INCHES NOMINAL IN |
| Material Document and Classification | AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.438 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.000 INCHES NOMINAL IN |
| Grip Diameter | 0.437 INCHES NOMINAL 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 | 20 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.672 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 |
|---|---|
| ST3M557-7-16 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4027-7-16 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M557-7-16 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4027-7-16 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4027-7-16 | Howmet Global Fastening Systems Inc (USA) |
| WC4027-7-16 | West Coast Aerospace, Inc. (USA) |
| HT4027-7-16 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4027-7-16 | 5/2 Secondary reference U.S. Government activity |
| HT4027-7-16 | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-514-4084 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-514-4084 has 7 manufacturer part numbers on file: ST3M557-7-16 (Fastener Innovation Technology, Inc. Dba F I T), HT4027-7-16 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M557-7-16 (The Boeing Company Div Defense), HT4027-7-16 (Sps Technologies, Llc Dba PB Fasteners), HT4027-7-16 (Howmet Global Fastening Systems Inc) and 2 more.
Key specifications for ST3M557-7-16: Fastener Length: 1.656 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.656 INCHES NOMINAL IN; Material Document and Classification: AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 17 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.