i have nothing to compare this arbor with but i think it is 4 s ...arbor dia is .625 pull in thread dia mikes at.975 x 20 thd per inch and.735 in long.. body of arbor next to thread is .997 large end of taper is1.365 dia small end of taper is.990 and length of taper is.700... lenth of collet section is 3.2 in [ large end of taper to end of thd section.
Optris CT LT20 Compact Pyrometers Precise non-contact temperature measurementfrom -50°C to 975°COne of the smallest infrared sensors worldwidewith 22:1 optical resolutionRugged and usable up to 180°C ambienttemperature without coolingSeparate electronics with easy accessiblepr
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