Specifications

• Steel : SUJ 2
• H.R.C. 45-52
• Surface Roughness: Ra 0.5um
• Internal hole by boring machine.
• PG (precision grade) TIR < 0.0004in (0.01mm)
• SG (standard grade) TIR < 0.0006in (0.015mm)
• Degree of concentricity exceeds the DIN standard. 100% inspected
• must be used with Think & Tinker BOPG-COLT nuts  and spanners

Benefits

• low noise operation
• longer tool life
• more accurate cutting and higher kerf fidelity
• compatible with carbide microtools
• low TIR means less wear and tear on spindle bearings

Specifications

• used in applications where speeds exceed 10,000 PRM
• H.R.C. 45-52
• balanced to G2.5 for 24,000 RPM's
• TIR (with BOPG-COLT collet) < 0.0004" (0.013mm)
• must be used with Think & Tinker BOPG-COLT collets and spanners

Benefits

• improved collet centering and tool shank clamping
• low noise operation
• longer tool life
• more accurate cutting and higher kerf fidelity
• compatible with carbide microtools
• low TIR means less wear and tear on spindle bearings

Based on the  ER20 Collet / Nut architecture, the Think & Tinker family of precision collets and nuts was designed to bring the precision  and flexibility of expensive high frequency spindles to low-cost, consumer and professional grade routers.

The snap-together design and eccentric extraction ring prevents collets from sticking or binding in the tapered spindle bore. Tool removal is consistently easy.

The internal bore of each collet is preloaded to lightly grip the shank of a bit when it is inserted, preventing tools from falling out or shifting while the nut is being tightened.  Please read Working with ER Nuts and Collets.

Before you purchase a set, please read the Bosch Colt Case Study