The Screw,close Tolerance, cataloged under National Stock Number 5305-01-284-4746, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Vertex Modernization and Sustainment Llc. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-284-4746 |
| Primary Part Number | 3929AS1227-3R4 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Vertex Modernization and Sustainment Llc |
| Status | ACTIVE |
| Head Height | 0.013 INCHES MAXIMUM IN |
| Fastener Length | 0.641 INCHES MINIMUM AND 0.671 INCHES MAXIMUM IN |
| Thread Length | 0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN |
| Material Document and Classification | 23-118,CAGEC 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.240 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Color | BLUE OVERALL |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 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 | 32 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.297 INCHES MINIMUM AND 0.302 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 |
|---|---|
| HT4027-3-4 | Hi-Shear Corporation (USA) |
| ST3M557-3-4 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| HT4027-3-4 | Howmet Global Fastening Systems Inc (USA) |
| HT4027-3-4 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3929AS1227-3R4 PRIMARY | Vertex Modernization and Sustainment Llc (USA) |
| WC4027-3-4 | West Coast Aerospace, Inc. (USA) |
| ST3M557-3-4 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| HT4027-3-4 | 5/9 Secondary reference U.S. Government activity |
| ST3M557-3-4 | 5/2 Secondary reference U.S. Government activity |
| 3929AS1227-3R4 | C/1 Advisory reference — outside the item-of-supply concept Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| HT4027-3-4 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| ABCD | 5/9 Secondary reference Thermo Electron Corp |
| HT4027-3-4 | 5/2 Secondary reference U.S. Government activity |
| HT4027-3-4 | 5/9 Secondary reference Huck International, Inc |
| ST3M557-3-4 | 5/9 Secondary reference The Boeing Company Div Defense |
| HT4027-3-4 | 5/9 Secondary reference U.S. Government activity |
| 10199376 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5305-01-284-4746 is a Screw,close Tolerance, manufactured by Vertex Modernization and Sustainment Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-284-4746 has 7 manufacturer part numbers on file: HT4027-3-4 (Hi-Shear Corporation), ST3M557-3-4 (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc), HT4027-3-4 (Howmet Global Fastening Systems Inc), HT4027-3-4 (Sps Technologies, Llc Dba PB Fasteners), 3929AS1227-3R4 (Vertex Modernization and Sustainment Llc) and 2 more.
1 possible match (shared part number, not a government interchangeability claim): 5905-01-585-8125. Verify interchangeability with system specifications before substitution.
Key specifications for 3929AS1227-3R4: Head Height: 0.013 INCHES MAXIMUM IN; Fastener Length: 0.641 INCHES MINIMUM AND 0.671 INCHES MAXIMUM IN; Thread Length: 0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN; Material Document and Classification: 23-118,CAGEC 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL. 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.