No Thread Knock Off Weld Studs (NTK) are plain-body ARC weld fasteners manufactured with a removable upper section that is intentionally detached after installation. Once the knock-off portion is removed, the remaining welded stud provides a lower finished projection than conventional no-thread weld studs while maintaining a permanent attachment to the base material.
Commonly used as locating pins, spacers, stops, rotational points, bridge deck attachments, and anti-skid devices, No Thread Knock Off Weld Studs are available in mild steel and stainless steel materials for fabrication, transportation, and infrastructure applications.
| Stud Specifications | Standard Accessories | ||||||
|---|---|---|---|---|---|---|---|
| Base Diameter (D) |
Minimum Length (L) |
Flash Dimensions | Ferrule P/N | Foot P/N | Grip P/N | Chuck P/N | |
| E | F | ||||||
| 0.25 | 0.875 | 0.359 | 0.109 | F025-F | B-1N | GN-025 | CN-025 |
| 0.312 | 0.875 | 0.438 | 0.109 | F031-F | B-1N | GN-031 | CN-031 |
| 0.375 | 1 | 0.5 | 0.125 | F037-F | B-1N | GN-037 | CN-037 |
| 0.437 | 1.25 | 0.578 | 0.141 | F043-F | B-1N | GN-043 | CN-043 |
| 0.5 | 1.25 | 0.688 | 0.156 | F050-F | B-1N | GN-050 | CN-050 |
| 0.625 | 1.5 | 0.797 | 0.188 | F062-F | B-2N | GN-062 | CN-062 |
| 0.75 | 1.5 | 0.938 | 0.25 | F075-F | B-2N | GN-075 | CN-075 |
| 0.875 | 1.5 | 1.094 | 0.313 | F087-F | B-3N | GN-087 | CN-087 |
| 1 | 1.625 | 1.234 | 0.375 | F100-F | B-3N | GN-100 | CN-100 |
To order or specify give: Stud Code, Diameter, Length (L), Base Length (A), Material and Quantity
Example: NTK, 5/16 x 1.00, KO to .375, (BW), mild steel, 2000 pcs.
Specify (L) Length, on a Before Weld basis by indicating “BW”
or on an After Weld basis by indicating “AW.”
No Thread Knock Off Weld Studs are engineered for applications requiring a welded attachment point with a controlled post-installation height not achievable with conventional NT stud configurations.
After welding is completed, the upper section of the stud is removed at the designated knock-off location, producing a lower residual stud height than standard no-thread weld studs.
The removable upper portion functions as a welding and handling extension during installation while allowing the finished assembly to retain only the required working projection.
The weld end geometry is designed for ferrule-shielded ARC stud welding, producing a metallurgical bond between the stud base and parent material through a controlled fusion process.
NTK studs are frequently installed on bridge decking and bridge expansion joints where the remaining welded projection assists in reducing vehicular skidding under service conditions.
Each stud diameter corresponds to dedicated ferrule, chuck, grip, and foot assemblies engineered to maintain alignment, plunge control, and weld pool containment during installation.
The remaining welded stud can serve as a locating pin, spacer, stop, rotational point, or positioning feature within fabricated assemblies and structural components.
No-Thread Knock-Off Weld Studs are ideal when a permanent welded pin is required but final projection must remain below the limits of standard no-thread stud designs. Share your finished height and diameter requirements for a matched configuration.