ROUND SPLIT ADJUSTABLE DIE

STAYBOLT TAPS

USING A HAND TAP

TM-9-243 Use and Care of Selected Hand Tools and Measuring Tools Manual
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USING A HAND TAP TM 9-243 DIES - Continued ROUND SPLIT ADJUSTABLE DIE The round split adjustable die (1), or button die, may be adjusted through the screws on the holder. Adjustment on the open type is done by turning the three screws on the holder. One expands the die while the other two compress the die. Adjustment of the screw type (2) is done by turning a fine-pitch screw that either forces the die jaws apart or allows them to spring together. The round split adjustable dies are used to cut American Standard Coarse and Fine Threads. A die holder or handle is needed for proper operation of round split adjustable dies. The following procedures may also be followed when using a taper tap or a bottoming hand tap. 1. Clamp a steel plate (1) securely in a vise (2). Drill and ream a hole of desired size. THREAD CUTTER SET The thread cutter set is made up of a combination of taps, dies, diestocks, tap wrenches, guides, and screwdrivers and wrenches for making adjustments. Thread cutter sets are used for cutting internal and external threads. 2. Select tap (3) and secure in tap wrench (4). 3. Apply cutting oil to the tap and the hole. 38-4

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