SK40 fma27 FMB FMC FMA Face Milling Holder Arbour FMA27

SK40 facemill holder also called facemill arbour and facemill adaptor 

SK40 FMA27 Is mainly used to hold Modular Indexable Cutter with Internal hole of 16 mm any cutter can come with a 27 mm Internal thread but normally 80 mm AND 100 mm Cutters are common in this range. 

Made from alloy steel hardened to 54 – 56rc
Balanced to G6.3 at 12,000 rpms
Concentricity is less than .005 micron upto 100 Length and 0.012 upto 200 Length
All critical tool holder surfaces precision ground
Gage length is 50MM,100MM,150MM,200MM,250MM,300MM
Rear thread for pull stud is M16 X 2.0