The Screw,close Tolerance, cataloged under National Stock Number 5305-01-579-4808, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-579-4808 |
| Primary Part Number | HT4027-6-11 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Fastener Length | 1.329 INCHES NOMINAL IN |
| Thread Length | 0.641 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.688 INCHES NOMINAL IN |
| Grip Diameter | 0.374 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | 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 |
|---|---|
| WC4027-6-11 | West Coast Aerospace, Inc. (USA) |
| ST3M557-6-11 | Heartland Precision Fasteners Inc (USA) |
| ST3M557-6-11 | The Boeing Company Div Defense (USA) |
| HT4027-6-11 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4027-6-11 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M557-6-11 | Houston Precision Fasteners I Lp (USA) |
| ST3M557-6-11 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M557-6-11 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4027-6-11 | Howmet Global Fastening Systems Inc (USA) |
| HT4027-6-11 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M557-6-11 | Camcar Llc Div Camcar Llc (USA) |
| HT4027-6-11 | Huck International, Inc (USA) |
| 11923-6-11 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4027-6-11 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M557-6-11 | Saturn Fasteners Inc (USA) |
| HT4027-6-11 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| HT4027-6-11 | 5/2 Secondary reference U.S. Government activity |
| HT4027-6-11 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-579-4808 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-579-4808 has 16 manufacturer part numbers on file: WC4027-6-11 (West Coast Aerospace, Inc.), ST3M557-6-11 (Heartland Precision Fasteners Inc), ST3M557-6-11 (The Boeing Company Div Defense), HT4027-6-11 (Sps Technologies, Llc Dba PB Fasteners), HT4027-6-11 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 11 more.
Key specifications for HT4027-6-11: Fastener Length: 1.329 INCHES NOMINAL IN; Thread Length: 0.641 INCHES NOMINAL IN; Nominal Thread Diameter: 0.375 INCHES IN; Head Style: FLAT COUNTERSUNK. 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.