The Screw,close Tolerance, cataloged under National Stock Number 5305-00-522-9598, 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 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-522-9598 |
| Primary Part Number | HT4024L8-12 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Fastener Length | 1.516 INCHES MINIMUM AND 1.546 INCHES MAXIMUM IN |
| Thread Length | 0.756 INCHES MINIMUM AND 0.806 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Grip Diameter | 0.4990 INCHES MINIMUM AND 0.4995 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 | 20 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.688 INCHES MINIMUM AND 0.755 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 |
|---|---|
| HT4024L8-12 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M455-8L12 | Howmet Global Fastening Systems Inc (USA) |
| 11907-8L12 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M455-8L12 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M455-8L12 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| WC4024L8-12 | West Coast Aerospace, Inc. (USA) |
| HT4024L8-12 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M455-8L12 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4024L8-12 PRIMARY | Hi-Shear Corporation (USA) |
| HT4024L8-12 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4024L8-12 | 5/9 Secondary reference U.S. Government activity |
| ST3M455-8L12 | 5/2 Secondary reference U.S. Government activity |
| ST3M455-8L12 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4024L8-12 | 5/9 Secondary reference U.S. Government activity |
| ST3M455-8L12 | 5/9 Secondary reference Huck International, Inc |
NSN 5305-00-522-9598 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-522-9598 has 10 manufacturer part numbers on file: HT4024L8-12 (Sps Technologies, Llc Dba PB Fasteners), ST3M455-8L12 (Howmet Global Fastening Systems Inc), 11907-8L12 (Reid Products Inc. Dba Reid Products Inc), ST3M455-8L12 (Sps Technologies Ltd, Tj Brooks Division), ST3M455-8L12 (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc) and 5 more.
Key specifications for HT4024L8-12: Fastener Length: 1.516 INCHES MINIMUM AND 1.546 INCHES MAXIMUM IN; Thread Length: 0.756 INCHES MINIMUM AND 0.806 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.500 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.