The Screw,close Tolerance, cataloged under National Stock Number 5305-01-477-5618, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 14 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-477-5618 |
| Primary Part Number | HT4020-4-14A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Head Height | 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Thread Length | 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| 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 | 0.502 INCHES MINIMUM AND 0.507 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 | Y |
| Part Number | Manufacturer |
|---|---|
| WC4020-4-14A | West Coast Aerospace, Inc. (USA) |
| HT4020-4-14A PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4020-4-14A PRIMARY | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M652C4-14A PRIMARY | Heartland Precision Fasteners Inc (USA) |
| HT4020-4-14A PRIMARY | Huck International, Inc (USA) |
| HT4020-4-14A PRIMARY | Hi-Shear Corporation (USA) |
| ST3M652C4-14A | Houston Precision Fasteners I Lp (USA) |
| ST3M652C4-14A | The Boeing Company Div Defense (USA) |
| HT4020-4-14A PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4020-4-14A PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M652C4-14A PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M652C4-14A PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4020-4-14A PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4020-4-14A PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| 11925C4-14A | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4020-4-14A | 3/2 Design control — primary reference U.S. Government activity |
| HT4020-4-14A | 3/2 Design control — primary reference U.S. Government activity |
| HT4020-4-14A | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-477-5618 is a Screw,close Tolerance, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-477-5618 has 15 manufacturer part numbers on file: WC4020-4-14A (West Coast Aerospace, Inc.), HT4020-4-14A (Sps Technologies, Llc Dba PB Fasteners), HT4020-4-14A (Sps Technologies Ltd, Tj Brooks Division), ST3M652C4-14A (Heartland Precision Fasteners Inc), HT4020-4-14A (Huck International, Inc) and 10 more.
Key specifications for HT4020-4-14A: Head Height: 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN; Thread Length: 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN; Criticality Code Justification: AGAV; Material Document and Classification: AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 14 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.