The DURO-M 2-jaw variant from RÖHM shares the all-steel construction, scroll-operated manual actuation, and multi-mount spindle compatibility of the DURO-M 4-jaw platform — configured with two opposing jaws for workpieces best gripped across a single pair of parallel faces. The same 13-size range (100 mm to 1,250 mm OD) and four spindle mount options apply to both jaw configurations.

2-jaw vs. 4-jaw in the DURO-M series — how to choose?

The 2-jaw DURO-M clamps square bars, rectangular blocks, and flat-sided workpieces across their two dominant parallel surfaces, leaving the other faces fully accessible for tool clearance. The 4-jaw DURO-M distributes clamping force across four contact points, providing more even pressure distribution for round or near-round workpieces. For square and rectangular cross-sections, the 2-jaw version avoids the distortion and jaw-marking that can occur when a 4-jaw scroll chuck attempts to grip across slightly non-parallel or out-of-square faces. Both variants are scroll-operated — all jaws advance and retract together from a single chuck key — so setup time is identical. The choice is purely about workpiece geometry and the number of contact points that produce the most stable grip.

Size selection

The DURO-M 2-jaw is available in the same OD range as the 4-jaw — from 100 mm (through-hole 20 mm, 6,300 rpm, 27 kN) through 1,250 mm (through-hole 550 mm, 450 rpm, 115 kN). Intermediate sizes at 125, 160, 200, 250, 315, 400, 500, 630, 700, 800, and 1,000 mm cover virtually any lathe from a bench-top toolroom machine to a heavy industrial turning center. RÖHM provides complete dimensional data for each size and mount type combination through its eShop and distributor network.