Customer Questions and Answers for Thumb Screw by Whirlpool

The Thumb Screw is an OEM replacement part for Whirlpool stand mixers. It acts as a fastener for securely attaching mixing attachments like the flat beater, whisk, or dough hook onto the power hub. Color: Black. It measures about 1-½” wide by ¾” high.

Causes of a bad thumb screw can include wear and tear from repeated securing and loosening of mixing attachments over time. 

Symptoms of a bad thumb screw include:

• Mixing tools detaching or falling off during use  
• Difficulty attaching or removing attachments
• Looseness where the screw mounts to the power hub

This OEM Whirlpool part is also compatible with KitchenAid, Kenmore, and some Bosch and Breville stand mixers.