Key width bcutter / broach

10 mm

Key height h

8 mm

Shaft seat t₁from OD

5.0 mm

Hub seat t₂from bore

3.3 mm

Under-keywayd − t₁ at mid Ø

29 mm

Over-hubwayd + t₂ at mid Ø

37.3 mm

Back clearanceh − t₁ − t₂

-0.3 mm

Suggested length≈ 1.5 × d

51 mmstock 22–110 mm

Form A — round ends. Mill a radius or leave as-sawn.

Fit normal: shaft N9 + hub JS9

Shop check · 343 N·m at mid Ø, 1.5·d, C45. Limited by bearing. 60 MPa shear / 120 MPa bearing — not a design calc.

Confirm against the print. Depths are nominal. Metric t₁ / t₂ are published seats, not h/2.