GN 476 T-Clamp mountings technical informations Material Aluminium. Types - Type A: with bore. - Type W: with bolt, Steel, zinc-plated, blue passivated. Finish - Version MT: matte, ground. - Version ELS: anodised, black. Clamping screws AISI 304 stainless steel socket cap screws DIN 912. Grub screw AISI 301 stainless steel DIN 913. Features and applications The T-Clamp mountings GN 476, Type W are an alternative to twistable two-way clamp mountings GN 475 if high angular forces are required. The standard clamping bolts are socket cap screws DIN 912. They can be replaced by adjustable clamping kits GN 511 (description see table of dimensions). Accessories Clamping kits GN 511 (clamping handles GN 300.1 with distance bushing).