The Screw,close Tolerance, cataloged under National Stock Number 5305-01-188-9641, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 18 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-188-9641 |
| Primary Part Number | HT4027-3-2 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| Status | ACTIVE |
| Fastener Length | 0.515 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN |
| Thread Length | 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN |
| Material Document and Classification | 23-118,FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.115 INCHES MINIMUM AND 0.135 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 |
|---|---|
| HT4027-3-2 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-3-2 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| HT4027-3-2 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4027-3-2 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M557-3-2 PRIMARY | Houston Precision Fasteners I Lp (USA) |
| ST3M557-3-2 PRIMARY | Camcar Llc Div Camcar Llc (USA) |
| 11923-3-2 PRIMARY | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M557-3-2 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4027-3-2 PRIMARY | Hi-Shear Corporation (USA) |
| HT4027-3-2 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M557-3-2 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M557-3-2 | Linread Ltd (GBR) |
| ST3M557-3-2 PRIMARY | Saturn Fasteners Inc (USA) |
| WC4027-3-2 PRIMARY | West Coast Aerospace, Inc. (USA) |
| HT4027-3-2 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M557-3-2 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| HT4027-3-2 PRIMARY | Huck International, Inc (USA) |
| ST3M557-3-2 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| ST3M557-3-2 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4027-3-2 | 5/9 Secondary reference U.S. Government activity |
| HT4027-3-2 | 5/9 Secondary reference U.S. Government activity |
| 3929AS1227-3R2 | 7/2 Vendor item drawing reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| WC4027-3-22 | 5/9 Secondary reference West Coast Aerospace, Inc. |
| 10319877 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| HT4027-3-2 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-188-9641 is a Screw,close Tolerance, manufactured by Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-188-9641 has 18 manufacturer part numbers on file: HT4027-3-2 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), ST3M557-3-2 (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc), HT4027-3-2 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4027-3-2 (Howmet Global Fastening Systems Inc), ST3M557-3-2 (Houston Precision Fasteners I Lp) and 13 more.
Key specifications for HT4027-3-2: Fastener Length: 0.515 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN; Thread Length: 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN; Material Document and Classification: 23-118,FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.190 INCHES IN. 16 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.