The Screw,close Tolerance, cataloged under National Stock Number 5305-01-513-9648, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 17 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-513-9648 |
| Primary Part Number | ST3M557-5-7 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Fastener Length | 0.953 INCHES MINIMUM AND 0.983 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.531 INCHES NOMINAL IN |
| Material Document and Classification | AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM 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 | 0.477 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 |
|---|---|
| ST3M557-5-7 | West Coast Aerospace, Inc. (USA) |
| ST3M557-5-7 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4027-5-7 | Huck International, Inc (USA) |
| ST3M557-5-7 PRIMARY | Hi-Shear Corporation (USA) |
| HT4027-5-7 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 11923-5-7 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M557-5-7 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4027-5-7 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4027-5-7 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M557-5-7 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| HT4027-5-7 | Howmet Global Fastening Systems Inc (USA) |
| ST3M557-5-7 | Saturn Fasteners Inc (USA) |
| ST3M557-5-7 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M557-5-7 | Heartland Precision Fasteners Inc (USA) |
| ST3M557-5-7 | Linread Ltd (GBR) |
| ST3M557-5-7 | Camcar Llc Div Camcar Llc (USA) |
| ST3M557-5-7 | Houston Precision Fasteners I Lp (USA) |
| Reference | Meaning |
|---|---|
| ST3M557 | D/9 Drawing number reference only The Boeing Company Div Defense |
| HT4027-5-7 | 5/2 Secondary reference U.S. Government activity |
| ST3M557-5-7 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4047-5-7 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-513-9648 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-513-9648 has 17 manufacturer part numbers on file: ST3M557-5-7 (West Coast Aerospace, Inc.), ST3M557-5-7 (Fastener Innovation Technology, Inc. Dba F I T), HT4027-5-7 (Huck International, Inc), ST3M557-5-7 (Hi-Shear Corporation), HT4027-5-7 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 12 more.
Key specifications for ST3M557-5-7: Fastener Length: 0.953 INCHES MINIMUM AND 0.983 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.531 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.