Janssen F Series, Operating Instructions Manual

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2) The bolts for K250 forming rollers (Ø25 mm) must fit
exactly into the bore of the K250 forming rollers without
wobbling!
3) The holes (Ø25 mm) in the K250 forming roller must not
be too deep, otherwise there is a risk that the bolts will
slip in too deep and there will no longer be a connection to
the holes in the forming roller flanges..
4.2 Exceptions for the use of Forming
roller adapters:
The F-series forming roller adapters are suitable for
K-series forming rollers under the following require-
ments:
Forming roller adapter for K250 forming rollers:
The K250 forming rollers are usually solid on the inside.
The forming roller adapters are mounted exactly in their
axial position on the left and right by means of two bolts.
Requirements for the intended Use:
1) The forming roller adapters fit exactly in the inner ring
(Ø94 mm) of the forming roller.
Bolts