This trailer hub is probably the most common used trailer wheel hub on small unbraked 750kg trailers in the UK
£19.49
Grease nipple tapered roller bearing hub kit
Includes tapered roller bearings to suit a 1″ diameter shaft, 3/8UNF studs and nuts and a dust hub cap
2 bearings: 44643L for the inner and 44643 for the outer
These trailer wheel hubs are popular for use with 8 inch and 10 inch wheels if your trailer wheel has a grease nipple cut out on the centre hole.
Common sizes include: 4.80-4.00/8, 16.5/6.5-8, 5.00/10, 20.5/8.0-10, 145/80B10, 145/80R10