Oil Seal TC 21x31x7mm - TC Double Lip NBR Rubber Oil Seal with Garter Spring 4300N A handy overview is below

A handy overview is below

The four bearings come in a set with rubber-sealed closures on both sides and are pre-lubed with low-friction grease to deliver smooth rotation and durable performance in cycling applications

Seal it tight and keep it clean - grab this TC28x45x8 seal and extend the life of your rotating parts with confidence

✅ Ball material: Si3N4 ceramic balls for high hardness

Oil Seal TC 21x31x7mm - TC Double Lip NBR Rubber Oil Seal with Garter Spring 4300N A handy overview is belowShaft Oil Seal TC21x31x7 Rubber Covered Double Lip w Garter Spring Rotary Shaft Seal Double Lip Shaft Diameter 21mm Width 7mm For Bore Diameter 31mm Nitrile Rubber Lip Material. Item Sku : TC21x31x7 Type : TC 21x31x7 mm Inner : 21mm Outer : 31mm Width : 7mm Size : 21mm x 31mm x 7mm Seal Material : Nitrile Butadiene Rubber Temperature Range : 40 to 248F