Product review (1 stars): IMO this belt does not work with Speed Queen washers.
Amazon.com claims that this belt fits my Speed Queen SWT521WA washer. However, this is an erroneous claim. The correct OEM factory replacement belt,  RSPC&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Speed-Queen-Belt-Agitate-Spin-Part-no-37820/dp/B004PI7UWY/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Speed Queen Belt Agitate & Spin - Part no. 37820</a>, is 30 inches in circumference. The belt I received was supposedly a Whirlpool 27001007 which, at 29 inches circumference as measured by yours truly, is a half inch smaller and also higher profile than the OEM belt - which means it is too tight a fit to work properly with the Speed Queen machine.

Now half an inch might not seem a lot to the layman, but an appliance pro will tell you that the design of the belt and pulley system on Speed Queen washers purposely incorporates a certain amount of belt slippage on the motor pulley. This is done in order to 1. not put too much stress on the motor when the washer starts into the hard work of turning the inner tub in the spin cycle, and 2. to allow the pump time to drain enough water before the inner tub comes up to speed in order to prevent centrifugal force of the spinning tub from sloshing that water over the top of the outer tub and dumping it on the floor.

Symptoms of this too tight belt include audible motor straining, motor rapidly clicking on and off or shutting down completely, and water dumped on the floor. Once I installed the OEM belt the washer worked flawlessly. My advice would be to purchase the factory recommended RSPC&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Speed-Queen-Belt-Agitate-Spin-Part-no-37820/dp/B004PI7UWY/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Speed Queen Belt Agitate & Spin - Part no. 37820</a>&nbsp;part for Speed Queen washers.