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Shars Tool ER20 Collets
- Made from alloy spring steel and hardened to HRC 44-48
- All fractional size is true imperial size, not a metric conversion size
- All collets are checked its runout individually on 4 contact points by a high tolerance bench marked testing rod
- On size 1/8" and larger the runout is .0003"; under size 1/8 the runout is .00059"
- On size 3.0mm and larger the runout is .0003"(0.008mm); under size 3.0mm the runout is .00059"(0.015mm)
- Each size of ER20 collet has collapsing range of .039" (1 mm); the size of the collet is the largest size it can hold and able to hold anything smaller within the collapsing range
- Each size of ER20 collet has collapsing range of .02" (0.5 mm); the size of the collet is the largest size it can hold and able to hold anything smaller within the collapsing range
Measurement
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