The Screw,close Tolerance, cataloged under National Stock Number 5305-01-591-1409, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Farbest Corp Sub of Kaiser Industries Corp. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-591-1409 |
| Primary Part Number | WC4027-6-23 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Farbest Corp Sub of Kaiser Industries Corp |
| Status | ACTIVE |
| Head Height | 0.018 INCHES MAXIMUM IN |
| Fastener Length | 2.064 INCHES MINIMUM AND 2.094 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MAS 2700 METHOD 1 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| 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 | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.428 INCHES MINIMUM AND 1.448 INCHES MAXIMUM IN |
| Grip Diameter | 0.374 INCHES MINIMUM AND 0.375 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 | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.510 INCHES MINIMUM AND 0.564 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 |
|---|---|
| HT4027-6-23 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4027-6-23 | Huck International, Inc (USA) |
| ST3M557-6-23 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4027-6-23 | Howmet Global Fastening Systems Inc (USA) |
| WC4027-6-23 PRIMARY | Farbest Corp Sub of Kaiser Industries Corp (USA) |
| ST3M557-6-23 | Linread Ltd (GBR) |
| ST3M557-6-23 | Heartland Precision Fasteners Inc (USA) |
| HT4027-6-23 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-6-23 | Camcar Llc Div Camcar Llc (USA) |
| ST3M557-6-23 | Saturn Fasteners Inc (USA) |
| ST3M557-6-23 | Houston Precision Fasteners I Lp (USA) |
| HT4027-6-23 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4027-6-23 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 11923-6-23 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4027-6-23 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4027-6-23 | 5/2 Secondary reference U.S. Government activity |
| HT4027-6-23 | 5/2 Secondary reference U.S. Government activity |
| ST3M557-6-23 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-591-1409 is a Screw,close Tolerance, manufactured by Farbest Corp Sub of Kaiser Industries Corp, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-591-1409 has 15 manufacturer part numbers on file: HT4027-6-23 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), HT4027-6-23 (Huck International, Inc), ST3M557-6-23 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), HT4027-6-23 (Howmet Global Fastening Systems Inc), WC4027-6-23 (Farbest Corp Sub of Kaiser Industries Corp) and 10 more.
Key specifications for WC4027-6-23: Head Height: 0.018 INCHES MAXIMUM IN; Fastener Length: 2.064 INCHES MINIMUM AND 2.094 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MAS 2700 METHOD 1 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.641 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.