D-Cut Shaft 5mm Diameter

5mm D-cut bearing-steel shaft for pulleys, gears, and printer motion assemblies. The ground flat gives grub screws a positive seat so set-screw pulleys and drive gears hold position instead of walking on a round shaft.

Why use the D-cut shaft

• 5mm diameter matches common 3D-printer pulleys, bearings, gears, and idler stacks.
• Ground flat improves grub-screw engagement for timing pulleys and drive gears.
• DIN100Cr6 bearing steel / HRC60 class direct-match spec for this shaft family, with tight diameter and length tolerances.

Specifications

• Diameter: 5mm
• Lengths stocked: 45mm, 50mm, 60mm, 72mm
• Profile: round shaft with one D-cut / ground flat
• Use: motion shafts, pulley shafts, gear shafts, idler stacks, and compact printer mechanisms

Fitment notes

• The 50mm and 72mm lengths match the FYSETC LH Stinger BOM entries for the Z-stack D shafts.
• Pairs naturally with the live LH Stinger Motion Kit and LH Stinger Starter Kit.
• If you need ERCF-specific rods and shafts as a bundled set, use the ERCF shafts and threaded rods set.

What it is not

• Not an 8mm linear rail shaft and not a smooth round shaft; this has a flat specifically for set-screw retention.
• Sold as individual shafts by selected length; check your BOM before mixing lengths.