3/16" ER20 Collet
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- Dia: 3/16"
- 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"
- Each size of ER32 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
- Conform to DIN6499B