Material: Steel, bright, turned, case hardened, hardening depth
min. 0.2 mm.

PTFE coated, blue-coloured. The very low friction enables precise
adjusting at high wear resistance. Spherical washers DIN 6319 type C are
mostly used with conical seats DIN 6319 type D, for screw fittings at
non-parallel faces. Conical seats DIN 6319 type G, with larger outside
diameter and height, should be used at relatively big holes or slot
holes.

* Total height, together with spherical washer.