The Screw,close Tolerance, cataloged under National Stock Number 5305-01-513-6935, 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 18 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-513-6935 |
| Primary Part Number | ST3M557-3-9 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.547 INCHES MINIMUM AND 0.577 INCHES MAXIMUM IN |
| Thread Length | 0.406 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.2966 INCHES MINIMUM AND 0.3016 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 |
|---|---|
| HT4027-3-9 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M557-3-9 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4027-3-9 | Hi-Shear Corporation (USA) |
| HT4027-3-9 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M557-3-9 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-3-9 | Houston Precision Fasteners I Lp (USA) |
| HT4027-3-9 | West Coast Aerospace, Inc. (USA) |
| ST3M557-3-9 | Linread Ltd (GBR) |
| ST3M557-3-9 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4027-3-9 | Howmet Global Fastening Systems Inc (USA) |
| HT4027-3-9 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M557-3-9 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| ST3M557-3-9 | Huck International, Inc (USA) |
| ST3M557-3-9 | Saturn Fasteners Inc (USA) |
| ST3M557-3-9 | Heartland Precision Fasteners Inc (USA) |
| ST3M577-3-9 | Camcar Llc Div Camcar Llc (USA) |
| ST3M557-3-9 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 11923-3-9 | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4027-3-9 | 5/9 Secondary reference Sps Technologies Inc |
| HT4027-3-9 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-513-6935 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-513-6935 has 18 manufacturer part numbers on file: HT4027-3-9 (Sps Technologies, Llc Dba PB Fasteners), ST3M557-3-9 (The Boeing Company Div Defense), HT4027-3-9 (Hi-Shear Corporation), HT4027-3-9 (Fastener Innovation Technology, Inc. Dba F I T), ST3M557-3-9 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 13 more.
Key specifications for ST3M557-3-9: Fastener Length: 0.547 INCHES MINIMUM AND 0.577 INCHES MAXIMUM IN; Thread Length: 0.406 INCHES NOMINAL IN; Material Document and Classification: AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.190 INCHES IN. 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.