The Screw,close Tolerance, cataloged under National Stock Number 5305-01-477-5626, 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 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-477-5626 |
| Primary Part Number | HT4020-6-15A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Head Height | 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN |
| Fastener Length | 1.542 INCHES MINIMUM AND 1.629 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.756 INCHES MINIMUM AND 0.760 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 |
|---|---|
| ST3M652C6-15A | The Boeing Company Div Defense (USA) |
| WC4020-6-15A | West Coast Aerospace, Inc. (USA) |
| HT4020-6-15A PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M652C6-15A PRIMARY | Heartland Precision Fasteners Inc (USA) |
| HT4020-6-15A PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M652C6-15A PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4020-6-15A PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-6-15A PRIMARY | Huck International, Inc (USA) |
| 11925C6-15A | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4020-6-15A PRIMARY | Hi-Shear Corporation (USA) |
| HT4020-6-15A PRIMARY | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M652C6-15A | Houston Precision Fasteners I Lp (USA) |
| HT4020-6-15A PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4020-6-15A PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M652C6-15A PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| HT4020-6-15A | 3/2 Design control — primary reference U.S. Government activity |
| HT4020-6-15A | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-477-5626 is a Screw,close Tolerance, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-477-5626 has 15 manufacturer part numbers on file: ST3M652C6-15A (The Boeing Company Div Defense), WC4020-6-15A (West Coast Aerospace, Inc.), HT4020-6-15A (Sps Technologies, Llc Dba PB Fasteners), ST3M652C6-15A (Heartland Precision Fasteners Inc), HT4020-6-15A (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 10 more.
Key specifications for HT4020-6-15A: Head Height: 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN; Fastener Length: 1.542 INCHES MINIMUM AND 1.629 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN. 16 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.