The Screw,close Tolerance, cataloged under National Stock Number 5305-01-477-5620, 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 Div PB Fasteners. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-477-5620 |
| Primary Part Number | HT4020-5-20A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| Status | ACTIVE |
| Head Height | 0.088 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Thread Length | 0.505 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| 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 | 0.629 INCHES MINIMUM AND 0.634 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 |
|---|---|
| ST3M652C5-20A | Houston Precision Fasteners I Lp (USA) |
| HT4020-5-20A PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4020-5-20A PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M652C5-20A PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4020-5-20A PRIMARY | Hi-Shear Corporation (USA) |
| WC4020-5-20A | West Coast Aerospace, Inc. (USA) |
| HT4020-5-20A PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-5-20A PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 11925C5-20A | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4020-5-20A PRIMARY | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M652C5-20A | The Boeing Company Div Defense (USA) |
| ST3M652C5-20A PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4020-5-20A PRIMARY | Huck International, Inc (USA) |
| ST3M652C5-20A PRIMARY | Heartland Precision Fasteners Inc (USA) |
| HT4020-5-20A PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| HT4020-5-20A | 3/2 Design control — primary reference U.S. Government activity |
| HT4020-5-20A | 3/2 Design control — primary reference U.S. Government activity |
| HT4020-5-20A | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-477-5620 is a Screw,close Tolerance, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-477-5620 has 15 manufacturer part numbers on file: ST3M652C5-20A (Houston Precision Fasteners I Lp), HT4020-5-20A (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), HT4020-5-20A (Howmet Global Fastening Systems Inc), ST3M652C5-20A (Fastener Innovation Technology, Inc. Dba F I T), HT4020-5-20A (Hi-Shear Corporation) and 10 more.
Key specifications for HT4020-5-20A: Head Height: 0.088 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN; Thread Length: 0.505 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN; Criticality Code Justification: AGAV; Material Document and Classification: AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.