SPI 75-971-2 Size 4 Quick-Change Torque Tap Holder Tapping Adapter
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The SPI 75-971-2 is a new Size 4 quick-change torque tap holder (tapping adapter) from SPI's Tapmaster line, bearing patent number 4284370, as stamped on the body and confirmed by the original SPI-branded box label reading "Q-C S4 TORQUE TAP HLDR 75-971-2." This unit is a synchronous/tension-compression floating tapping chuck insert designed for use with compatible Size 4 quick-change tapping chuck bodies on CNC machining centers, turret lathes, and tapping machines; the knurled outer ring allows tool-free tap collet installation and removal. The internal square drive bore (visible in the bottom-view photo) accepts standard tap collets for the Size 4 series, transmitting drive torque through the positive engagement mechanism while the built-in torque-limiting clutch protects taps from breakage under overload conditions. The body is oxide-blackened alloy steel with a precision-ground shank interface and retaining groove for quick-change snap-in engagement with the parent chuck body. Condition is new, supplied in the original SPI packaging.
Product Specifications
| Brand | SPI |
| MPN | 75-971-2 |
| Series / Line | Tapmaster |
| Size | 4 |
| Type | Quick-Change Torque Tap Holder |
| Patent Number | 4284370 |
| Drive Type | Square drive bore (tap collet) |
| Clutch / Float | Torque-limiting overload clutch |
| Body Material | Alloy steel |
| Body Finish | Black oxide |
| Condition | New |
| Compatible Chuck Size | Size 4 quick-change tapping chuck bodies |