The Screw,close Tolerance, cataloged under National Stock Number 5305-01-587-3954, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company. Government technical data includes 15 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-587-3954 |
| Primary Part Number | HT4027-4-7 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| Status | ACTIVE |
| Fastener Length | 0.906 INCHES NOMINAL IN |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Material Document and Classification | AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.437 INCHES NOMINAL IN |
| Grip Diameter | 0.249 INCHES NOMINAL IN |
| Internal Drive Style | TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.389 INCHES MINIMUM AND 0.395 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 |
|---|---|
| WC4027-4-7 | West Coast Aerospace, Inc. (USA) |
| ST3M557-4-7 | Heartland Precision Fasteners Inc (USA) |
| ST3M557-4-7 | Houston Precision Fasteners I Lp (USA) |
| HT4027-4-7 | Hi-Shear Corporation (USA) |
| ST3M557-4-7 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4027-4-7 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-4-7 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| 11923-4-7 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4027-4-7 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M557-4-7 | Saturn Fasteners Inc (USA) |
| ST3M557-4-7 | Camcar Llc Div Camcar Llc (USA) |
| ST3M557-4-7 | Linread Ltd (GBR) |
| HT4027-4-7 | Huck International, Inc (USA) |
| HT4027-4-7 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M557-4-7 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| HT4027-4-7 | 5/2 Secondary reference U.S. Government activity |
| HT4027-4-7 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| ST3M557-4-7 | 5/9 Secondary reference Swift Ohio Corp |
| ST3M557-4-7 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4027-4-7 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-587-3954 is a Screw,close Tolerance, manufactured by Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-587-3954 has 15 manufacturer part numbers on file: WC4027-4-7 (West Coast Aerospace, Inc.), ST3M557-4-7 (Heartland Precision Fasteners Inc), ST3M557-4-7 (Houston Precision Fasteners I Lp), HT4027-4-7 (Hi-Shear Corporation), ST3M557-4-7 (Fastener Innovation Technology, Inc. Dba F I T) and 10 more.
Key specifications for HT4027-4-7: Fastener Length: 0.906 INCHES NOMINAL IN; Thread Length: 0.469 INCHES NOMINAL IN; Material Document and Classification: AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.250 INCHES IN. 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.