Recess Gaging: Wobble, Strength, TIR

Wobble Gaging Fixture and Plug Gages

Wobble gaging provides a means for determining the compatibility of cross recesses in the heads of machine, tapping and wood screws with companion screw drivers and will indicate the point where deviations in the recess contours affect satisfactory driver engagement. Recesses which exhibit excessive wobble characteristics will cause poor screw drivability because of driver camout prior to attaining normal torque level, damage to recesses, and/or accelerated driver wear.

Recess Torsional Strength Tester  Model STF-87114

This device is suitable for testing #6 through 1/2″ screws according to MIL-S-87114A and other similar specifications. This tester comes with a set of weights of 15, 20 and 25 pounds. The end load pressure is not affected when the torque is applied. The required torque wrenches must be purchased separately.

Recess TIR Gage

This gage was specifically developed to measure the concentricity of a screw’s shank to its recess or external drive system quickly and accurately. This fastener characteristic is becoming more critical with the widening use of automatic screw feeding and driving assembly equipment. If a screw’s recess is too far from the axis of its shank the automatic equipment’s driver can not engage the recess and the equipment will jam, ruining its efficiency. This gage’s single recess measuring element will inspect all styles of recesses in all screw sizes #4 through 1/4″ (M3M6). The gage comes with an 11 piece collet set and an electronic indicator that provides .0001″ resolution and the absolute TIR measurement without adding or subtracting. This easy-to-use gage provides Gage Repeatability and Reproducibility Study results of less than 20%.  

Slot Width Gage Sets

Fastener Inspection Products

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