Machine Design
When two non-intersecting and non-coplanar shafts are connected by gears, the arrangement is known as

Bevel gearing
Spur gearing
Spiral gearing
Helical gearing

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Machine Design
The designation M 33 × 2 of a bolt means

Metric threads with cross-section of 33 mm
Bolt of 33 mm nominal diameter having 2 threads per cm
Metric threads of 33 numbers in 2 cm
Metric threads of 33 mm outside diameter and 2 mm pitch

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