The Screw,close Tolerance, cataloged under National Stock Number 5305-01-253-4860, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 7 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-253-4860 |
| Primary Part Number | HT4027-4-6 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Fastener Length | 0.828 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM OVERALL |
| Minimum Tensile Strength | 7500 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| 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 | 0.456 INCHES MINIMUM AND 0.508 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 |
|---|---|
| HT4027-4-6 | Huck International, Inc (USA) |
| ST3M557-4-6 | Adept Fasteners Inc (USA) |
| HT4027-4-6 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT4027-4-6 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| HT4027-4-6 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4027-4-6 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4027-4-6 PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| WC4027-4-6 | C/1 Advisory reference — outside the item-of-supply concept West Coast Aerospace, Inc. |
| HT4027-4-6 | 5/2 Secondary reference U.S. Government activity |
| HT4027-4-6 | 5/2 Secondary reference U.S. Government activity |
| HT4027-4-6 | C/1 Advisory reference — outside the item-of-supply concept Sps Technologies, Llc Dba PB Fasteners |
| HT4027-4-6 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-253-4860 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-253-4860 has 7 manufacturer part numbers on file: HT4027-4-6 (Huck International, Inc), ST3M557-4-6 (Adept Fasteners Inc), HT4027-4-6 (Howmet Global Fastening Systems Inc), HT4027-4-6 (Howmet Global Fastening Systems Inc Div City of Industry Operations), HT4027-4-6 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 2 more.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-536-0106. Verify interchangeability with system specifications before substitution.
Key specifications for HT4027-4-6: Fastener Length: 0.828 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN; Thread Length: 0.469 INCHES NOMINAL IN; Material Document and Classification: AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.250 INCHES IN. 17 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.