The Screw,close Tolerance, cataloged under National Stock Number 5305-01-494-8385, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 18 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-494-8385 |
| Primary Part Number | HT4020-6-19 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Head Height | 0.1147 INCHES MINIMUM AND 0.1167 INCHES MAXIMUM IN |
| Fastener Length | 1.297 INCHES MINIMUM AND 1.869 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.625 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.3750 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.1775 INCHES MINIMUM AND 1.1975 INCHES MAXIMUM IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 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 | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.7556 INCHES MINIMUM AND 0.7604 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 |
|---|---|
| HT4020-6-19 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M652C6-19D | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4020-6-19 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-6-19 PRIMARY | Huck International, Inc (USA) |
| ST3M652C6-19D PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M652C6-19D | West Coast Aerospace, Inc. (USA) |
| ST3M652C6-19D | Howmet Global Fastening Systems Inc (USA) |
| HT4020-6-19 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4020-6-19 | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-19 | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-19 | 5/9 Secondary reference U.S. Government activity |
| HT4020-6-19 | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-494-8385 is a Screw,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-494-8385 has 8 manufacturer part numbers on file: HT4020-6-19 (Sps Technologies Ltd, Tj Brooks Division), ST3M652C6-19D (Fastener Innovation Technology, Inc. Dba F I T), HT4020-6-19 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4020-6-19 (Huck International, Inc), ST3M652C6-19D (The Boeing Company Div Defense) and 3 more.
Key specifications for HT4020-6-19: Head Height: 0.1147 INCHES MINIMUM AND 0.1167 INCHES MAXIMUM IN; Fastener Length: 1.297 INCHES MINIMUM AND 1.869 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.625 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN. 18 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.