The Screw,close Tolerance, cataloged under National Stock Number 5305-00-357-1878, 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 18 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-357-1878 |
| Primary Part Number | HT4028L4-9 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 1.016 INCHES MINIMUM AND 1.046 INCHES MAXIMUM IN |
| Thread Length | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.389 INCHES MINIMUM AND 0.394 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 |
|---|---|
| ST3M466V4L9-1 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4028L4-9 | Huck International, Inc (USA) |
| ST3M466V4L9-1 | Heartland Precision Fasteners Inc (USA) |
| HT4028L4-9 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M466V4L9-1 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M466V4L9-1 | Linread Northbridge (aircraft Product Division) (GBR) |
| ST3M466V4L9-1 | Saturn Fasteners Inc (USA) |
| HT4028L4-9 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4028L4-9 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 11909V4L9-1 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M466V4L9-1 | Camcar Llc Div Camcar Llc (USA) |
| WC4028L4-9 | West Coast Aerospace, Inc. (USA) |
| HT4028L4-9 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M466V4L9-1 | Houston Precision Fasteners I Lp (USA) |
| HT4028L4-9 PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4028L4-9 | 5/2 Secondary reference U.S. Government activity |
| HT4028L4-9 | 5/9 Secondary reference U.S. Government activity |
| HT4028L4-9 | 5/9 Secondary reference U.S. Government activity |
| ST3M466V4L9-1 | 5/9 Secondary reference U.S. Government activity |
| ST3M466V4L9-1 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4028L4-9 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
NSN 5305-00-357-1878 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-357-1878 has 15 manufacturer part numbers on file: ST3M466V4L9-1 (Sps Technologies Ltd, Tj Brooks Division), HT4028L4-9 (Huck International, Inc), ST3M466V4L9-1 (Heartland Precision Fasteners Inc), HT4028L4-9 (Howmet Global Fastening Systems Inc), ST3M466V4L9-1 (Fastener Innovation Technology, Inc. Dba F I T) and 10 more.
Key specifications for HT4028L4-9: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 1.016 INCHES MINIMUM AND 1.046 INCHES MAXIMUM IN; Thread Length: 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN. 18 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.