The Screw,close Tolerance, cataloged under National Stock Number 5305-01-178-9308, 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 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through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-178-9308 |
| Primary Part Number | 3929AS1227-3R5 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Vertex Modernization and Sustainment Llc |
| Status | ACTIVE |
| Fastener Length | 0.702 INCHES MINIMUM AND 0.749 INCHES MAXIMUM IN |
| Thread Length | 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| 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 |
|---|---|
| 11923-3-5 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M557-3-5 | Heartland Precision Fasteners Inc (USA) |
| ST3M557-3-5 | Saturn Fasteners Inc (USA) |
| ST3M557-3-5 | Houston Precision Fasteners I Lp (USA) |
| HT4027-3-5 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4027-3-5 | Howmet Global Fastening Systems Inc (USA) |
| HT4027-3-5 | Hi-Shear Corporation (USA) |
| ST3M557-3-5 | Camcar Llc Div Camcar Llc (USA) |
| ST3M557-3-5 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M557-3-5 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M557-3-5 | West Coast Aerospace, Inc. (USA) |
| ST3M557-3-5 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| HT4027-3-5 | Huck International, Inc (USA) |
| ST3M557-3-5 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3929AS1227-3R5 PRIMARY | Vertex Modernization and Sustainment Llc (USA) |
| Reference | Meaning |
|---|---|
| ST3M557-3-5 | 5/9 Secondary reference Sps Technologies Inc |
| HT4027-3-5 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4027-3-5 | 5/9 Secondary reference U.S. Government activity |
| HT4027-3-5 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| HT4027-3-5 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| HT4027-3-5 | 5/2 Secondary reference U.S. Government activity |
| HT4027-3-5 | 5/2 Secondary reference U.S. Government activity |
| 10115551 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| ST3M557-3-5 | 5/9 Secondary reference The Boeing Company Div Defense |
NSN 5305-01-178-9308 is a Screw,close Tolerance, manufactured by Vertex Modernization and Sustainment Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-178-9308 has 15 manufacturer part numbers on file: 11923-3-5 (Reid Products Inc. Dba Reid Products Inc), ST3M557-3-5 (Heartland Precision Fasteners Inc), ST3M557-3-5 (Saturn Fasteners Inc), ST3M557-3-5 (Houston Precision Fasteners I Lp), HT4027-3-5 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 10 more.
Key specifications for 3929AS1227-3R5: Fastener Length: 0.702 INCHES MINIMUM AND 0.749 INCHES MAXIMUM IN; Thread Length: 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.190 INCHES IN; Head Style: OVAL COUNTERSUNK. 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.