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Vicmarc VM120 Jaw Screw size?

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Bill21:
Glad you’re sorted.

I’m not a fan of countersunk screws as they can self tighten in use. To make things worse the hex key for them is a size smaller than for a cap head. You generally have to use what the chuck manufacturers intended though. My Axminster SK100 uses Cap Head screws and although my RP chuck came with countersunk screws I’ve found I can use Cap Heads with it instead.

RichardS:
Some Chuck makers recommend that the screws are High Tensile Steel type.

I prefer to use Torx type screws as they have a better fitting key than the Allen Key type.

Richard

Bill21:
Metric High Tensile screws should have a number of the grade marked on them.

John D Smith:

 Hi Bill 21,
              That is very useful information thanks.

                                                  John

yew turn:
Just for more info regarding the tensile strengths of fasteners:-

  8.8 grade -  hexagon high tensile setscrews
10.9 grade - socket countersunk screws
12.9 grade - socket cap screws

Hope this helps.

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