Overview Reviews Product Description HD type universal joints incorporate induction hardened yoke ears for longer life using the standard pin and block design. It is ideal for applications with angles up to 25° and speeds of up to 1,750 RPM. Boot retaining grooves are standard. HD Type are available in round, hex, splined, or keyway bore. For optimal wear and extended life, lubrication and boots are required. (Boots are available for purchase separately.) HDD and HDDX drive line assemblies can also be provided to increase life of your drive line or drive shaft. Timken Lovejoy Master Catalog Product Videos Custom Field Series HD-12B Shaft diameter 25mm x 25mm Coupling type Universal joint Product Reviews Write a Review Write a Review × Timken 25mm x 25mm Shaft HD-12B Series Lovejoy® Hardened Universal Joint HD12B-UJ-25MMH7X25MMH7 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *