The Screw,close Tolerance, cataloged under National Stock Number 5305-01-385-4603, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 15 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-385-4603 |
| Primary Part Number | ST3M455-4L24-1 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.070 INCHES MINIMUM AND 0.074 INCHES MAXIMUM IN |
| Fastener Length | 1.954 INCHES MINIMUM AND 1.984 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.490 INCHES MINIMUM AND 1.510 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 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 | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.3898 INCHES MINIMUM AND 0.3948 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 |
|---|---|
| HT4024L4-24 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M455-4L24-1 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M455-4L24-1 | Houston Precision Fasteners I Lp (USA) |
| HT4024L4-24 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4024L4-24 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4024L4-24 | Hi-Shear Corporation (USA) |
| ST3M455-4L24-1 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4024L4-24 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4024L4-24 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M455-4L24-1 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M455-4L24-1 | Heartland Precision Fasteners Inc (USA) |
| HT4024L4-24 | Howmet Global Fastening Systems Inc (USA) |
| WC4024L4-24 | West Coast Aerospace, Inc. (USA) |
| HT4024L4-24 | Huck International, Inc (USA) |
| 11907-4L24-1 | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4024L4-24 | 5/9 Secondary reference U.S. Government activity |
| HT4024L4-24 | 5/9 Secondary reference U.S. Government activity |
| ST3M455-4L24-1 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| HT4024L4-24 | 5/9 Secondary reference Sps Technologies Inc |
| HT4024L4-24 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-385-4603 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-385-4603 has 15 manufacturer part numbers on file: HT4024L4-24 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), ST3M455-4L24-1 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M455-4L24-1 (Houston Precision Fasteners I Lp), HT4024L4-24 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4024L4-24 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 10 more.
Key specifications for ST3M455-4L24-1: Head Height: 0.070 INCHES MINIMUM AND 0.074 INCHES MAXIMUM IN; Fastener Length: 1.954 INCHES MINIMUM AND 1.984 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.469 INCHES NOMINAL 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.