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When selecting finishes, select the RoHS compliant finishes. They are better for the environment and less expensive!

ST-1200 Line - Size 5 and 6 Studs
Special Offset Wing

This special Offset Wing Head stud is designed for use where the standard wing head stud would be prevented from operation because of an obstruction.

Moving the wing off the center of the stud allows for the stud to be placed much closer to anything that might interfere with its operation. The standard Wing Head stud has the wing centered on the stud requiring half of the wing width (.563" (14.30 mm) for size 5 and .625" (15.88 mm) for size 6) clearance on all sides of the stud for operation.

With the wing offset, the required clearance on one side of the stud is decreased to just slightly over half of the stud head diameter.

As a result of the offset, this stud could be mounted close to a vertical surface and still be operable. In fact, since the operation of the stud only requires 90° of rotation, with the proper orientation, this stud could be placed in a corner.

Standard Parts
Component Material Finish1
Stud Hardened Steel Zinc Trivalent Clear .0003 thick. Trivalent Chromate Clear with Sealer (RoHS Compliant)
Specification(s): ASTM-B-633, Type III, SC 2, Clear
Suffix: -Z3CT
Wing carbon steel Zinc Trivalent Clear .0003 thick. Trivalent Chromate Clear with Sealer (RoHS Compliant)
Specification(s): ASTM-B-633, Type III, SC 2, Clear
Suffix: -Z3CT
1 Optional Finishes: Change the plating suffix on the part number from "Z3CT" to the desired plating. See finishes pages.

Stud Dimensions

Size 5: 121J-W5*W15-Z3CT
Offset Wing Head Stud Picture Wing Head Stud Dimension Drawing
Stud Part Number Grip Length (G) Undercut Dimension (U)
inch mm inch mm
121J-W530W15-Z3CT.3007.62.1253.18
121J-W540W15-Z3CT.40010.16.1904.83
121J-W550W15-Z3CT.50012.70.2506.35
121J-W560W15-Z3CT.60015.24.3007.62
121J-W570W15-Z3CT.70017.78.40010.16
121J-W580W15-Z3CT.80020.32.50012.70
121J-W590W15-Z3CT.90022.86.60015.24
121J-W5100W15-Z3CT1.00025.40.70017.78
121J-W5110W15-Z3CT1.10027.94.70017.78
121J-W5120W15-Z3CT1.20030.48.70017.78
Size 6: 121J-W6*W14-Z3CT
Offset Wing Head Stud Picture Wing Head Stud Dimension Drawing
Stud Part Number Grip Length (G) Undercut Dimension (U)
inch mm inch mm
121J-W635W14-Z3CT.3508.89.1503.81
121J-W640W14-Z3CT.40010.16.1904.83
121J-W650W14-Z3CT.50012.70.2506.35
121J-W660W14-Z3CT.60015.24.3007.62
121J-W670W14-Z3CT.70017.78.3508.89
121J-W680W14-Z3CT.80020.32.45011.43
121J-W690W14-Z3CT.90022.86.55013.97
121J-W6100W14-Z3CT1.00025.40.65016.51
121J-W6110W14-Z3CT1.10027.94.65016.51
121J-W6120W14-Z3CT1.20030.48.65016.51

* is the "Stud Grip". For example, 121J-W640W14-Z3CT is an Size 6 offset wing head stud with a "Stud Grip" of 40 (.400").

The undercut is a part of the stud which is smaller in diameter than the stud shank. The undercut is located directly under the head. This decreased diameter is where the retainer fits to prevent the stud from coming out of the mounting hole.

Note: The "G" (Grip) and "U" (Undercut) dimensions are measured to the underside of the head.