The Screw,close Tolerance, cataloged under National Stock Number 5305-01-560-0625, 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 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-560-0625 |
| Primary Part Number | HT4027-6-12 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Fastener Length | 1.391 INCHES NOMINAL IN |
| Thread Length | 0.641 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.750 INCHES NOMINAL IN |
| Grip Diameter | 0.374 INCHES MINIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.564 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 |
|---|---|
| HT4027-6-12 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M557-6-12 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M557-6-12 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| HT4027-6-12 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4027-6-12 | Howmet Global Fastening Systems Inc (USA) |
| HT4027-6-12 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4027-6-12 | Huck International, Inc (USA) |
| HT4027-6-12 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| ST3M557-6-12 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4027-6-12 | 5/9 Secondary reference Howmet Global Fastening Systems Inc Div City of Industry Operations |
| SHT4027-6-12 | 5/9 Secondary reference Huck International, Inc |
NSN 5305-01-560-0625 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-560-0625 has 8 manufacturer part numbers on file: HT4027-6-12 (Hi-Shear Corporation), ST3M557-6-12 (Fastener Innovation Technology, Inc. Dba F I T), ST3M557-6-12 (Howmet Global Fastening Systems Inc Div City of Industry Operations), HT4027-6-12 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), HT4027-6-12 (Howmet Global Fastening Systems Inc) and 3 more.
Key specifications for HT4027-6-12: Fastener Length: 1.391 INCHES NOMINAL IN; Thread Length: 0.641 INCHES NOMINAL IN; Material Document and Classification: AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.375 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.