QJ3 Series Four-Point Contact Ball Bearings

QJ300 series — 14 sizes, ISO 15 boundary dimensions with cross-brand equivalents.

Sizes in this series

Designation	Bore	Outer Ø	Width (B)	Cross-reference
QJ304	20 mm	52 mm	15 mm	equivalents →
QJ305	25 mm	62 mm	17 mm	equivalents →
QJ306	30 mm	72 mm	19 mm	equivalents →
QJ307	35 mm	80 mm	21 mm	equivalents →
QJ308	40 mm	90 mm	23 mm	equivalents →
QJ310	50 mm	110 mm	27 mm	equivalents →
QJ311	55 mm	120 mm	29 mm	equivalents →
QJ312	60 mm	130 mm	31 mm	equivalents →
QJ313	65 mm	140 mm	33 mm	equivalents →
QJ315	75 mm	160 mm	37 mm	equivalents →
QJ316	80 mm	170 mm	39 mm	equivalents →
QJ317	85 mm	180 mm	41 mm	equivalents →
QJ318	90 mm	190 mm	43 mm	equivalents →
QJ330	150 mm	320 mm	65 mm	equivalents →

Boundary-dimension reference only. Verify suffixes before substituting.