The Screw,close Tolerance, cataloged under National Stock Number 5305-01-027-4664, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 9 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-027-4664 |
| Primary Part Number | HT4020-5-9A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Head Height | 0.088 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Fastener Length | 1.078 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN |
| Thread Length | 0.506 INCHES MINIMUM AND 0.573 INCHES MAXIMUM IN |
| 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 |
| Grip Length | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| 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 | X |
| Part Number | Manufacturer |
|---|---|
| ST3M652C5-9A | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| HT4020-5-9A | Huck International, Inc (USA) |
| HT4020-5-9A PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| WC4020-5-9A PRIMARY | West Coast Aerospace, Inc. (USA) |
| ST3M652C5-9A PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4020-5-9A | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4020-5-9A PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT4020-5-9A PRIMARY | Hi-Shear Corporation (USA) |
| ST3M652C5-9A | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| Reference | Meaning |
|---|---|
| 10114872 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| HT4020-5-9A | 3/2 Design control — primary reference U.S. Government activity |
| ST3M652C5-9A | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-027-4664 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-027-4664 has 9 manufacturer part numbers on file: ST3M652C5-9A (Howmet Global Fastening Systems Inc Div City of Industry Operations), HT4020-5-9A (Huck International, Inc), HT4020-5-9A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), WC4020-5-9A (West Coast Aerospace, Inc.), ST3M652C5-9A (Fastener Innovation Technology, Inc. Dba F I T) and 4 more.
Key specifications for HT4020-5-9A: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.088 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN; Fastener Length: 1.078 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN. 19 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.