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ER-20 Collets

Accu-Collets ER COLLETS
AccuCollets™ Precision and UltraPrecision Collets DIN 6499-form B (ER) set new standards of accuracy.
Precision Collets concentricity is 15 microns or 0.0005" TIR or better
Ultra Precision Collets is 6 microns or 0.0002" TIR or better
  • Concentricity is 13 microns or 0.0005" TIR or better
  • Manufactured with Swiss technology
  • Crafted from high quality European alloy spring steel
  • TRUE INCH and metric sizes
  • Fractional Collets manufactured specifically for US market requirements. Use "on size" collets for best results
  • 16 slot construction for rigid clamping and extra concentricity
  • Accu-Collets improve tool life, part finish and reduces spindle wear
  • Can be used for drilling, milling, tapping and reaming
Precision ER Collets 0.0005" TIR or better as measured over the entire clamping range per DIN 6499 Standards
To order any of these items enter the Part Number into the search bar above. (This will take you to the product page where you can add the item to the shopping cart)
ON SIZE Nominal Size Precision Ultra Precision
Frac MM Dec. Range Nominal Sizes Covered
- 1.0 .039 0.039-0.019 13/32 20-0039-1.0 20-0039-1.0UP
3/64 - 0.046 0.046-0.026 3/64 20-0046-3/64 20-0046-3/64UP
1/16 - 0.062 0.062-0.042 1/16,3/64 20-0062-1/16 20-0062-1/16UP
5/64 - 0.078 0.078-0.058 5/64,1/16 20-0078-5/64 20-0078-5/64UP
- 2.0 0.079 0.079-0.040 5/64,1/16 20-0079-2.0 20-0079-2.0UP
3/32 - 0.093 0.093-0.054 3/32, 5/64, 1/16 20-0093-3/32 20-0093-3/32UP
7/64 - 0.109 0.109-0.089 7/64, 3/32 20-0109-7/64 20-0109-7/64UP
- 3.0 0.118 0.118-0.079 7/64, 3/32 20-0118-3.0 20-0118-3.0UP
1/8 - 0.125 0.125-0.086 1/8, 7/64 20-0125-1/8 20-0125-1/8UP
9/64 - 0.140 0.140-0.120 9/64, 1/8 20-0140-9/64 20-0140-9/64UP
5/32 - 0.156 0.156-0.117 5/32, 9/64, 1/8 20-0156-5/32 20-0156-5/32UP
- 4.0 0.157 0.157-0.118 5/32, 9/64 20-0157-4.0 20-0157-4.0UP
11/64 0.171 0.171-0.151 11/64, 5/32 20-0171-11/64 20-0171-11/64UP
3/16 - 0.187 0.187-0.148 3/16, 11/64 20-0187-3/16 20-0187-3/16UP
- 5.0 0.196 0.196-0.157 3/16, 11/64 20-0196-5.0 20-0196-5.0UP
13/64 - 0.203 0.203-0.183 13/64, 3/16 20-0203-13/64 20-0203-13/64UP
7/32 - 0.218 0.218-0.179 7/32, 13/64 20-0218-7/32 20-0218-7/32UP
15/64 - 0.234 0.234-0.214 15/64, 7/32 20-0234-15/64 20-0234-15/64UP
- 6.0 0.236 0.236-0.197 15/64, 7/32 20-0236-6.0 20-0236-6.0UP
1/4 - 0.250 0.250-0.211 1/4, 15/64, 7/32 20-0250-1/4 20-0250-1/4UP
17/64 - 0.265 0.265-0.245 17/64, 1/4 20-0265-17/64 20-0265-17/64UP
- 7.0 0.275 0.275-0.236 17/64, 1/4 20-0275-7.0 20-0275-7.0UP
9/32 - 0.281 0.281-0.242 9/32, 17/64 20-0281-9/32 20-0281-9/32UP
19/64 - 0.296 0.296-0.257 19/64, 9/32 20-0296-19/64 20-0296-19/64UP
5/16 - 0.312 0.312-0.273 5/16, 19/64, 9/32 20-0312-5/16 20-0312-5/16UP
- 8.0 0.315 0.315-0.276 5/16, 19/64 20-0315-8.0 20-0315-8.0UP
21/64 - 0.328 0.328-0.289 21/64, 5/16, 19/64 20-0328-21/64 20-0328-21/64UP
11/32 - 0.343 0.343-0.304 11/32, 21/64 20-0343-11/32 20-0343-11/32UP
- 9.0 0.354 0.354-0.315 11/32, 21/64 20-0354-9.0 20-0354-9.0UP
23/64 - 0.359 0.359-0.320 23/64, 11/32 20-0359-23/64 20-0359-23/64UP
3/8 - 0.375 0.375-0.336 3/8, 23/64 20-0375-3/8 20-0375-3/8UP
25/64 - 0.390 0.390-0.351 25/64, 3/8, 23/64 20-0390-25/64 20-0390-25/64UP
- 10.0 0.393 0.393-0.354 25/64, 3/8 20-0393-10.0 20-0393-10.0UP
13/32 - 0.406 0.406-0.367 13/32, 25/64, 3/8 20-0406-13/32 20-0406-13/32UP
27/64 - 0.421 0.421-0.382 27/64, 13/32 20-0421-27/64 20-0421-27/64UP
- 11.0 0.433 0.433-0.394 27/64, 13/32 20-0433-11.0 20-0433-11.0UP
7/16 - 0.437 0.437-0.398 7/16, 27/64 20-0437-7/16 20-0437-7/16UP
29/64 - 0.453 0.453-0.414 29/64, 7/16 20-0453-29/64 20-0453-29/64UP
15/32 - 0.468 0.468-0.429 15/32, 29/64, 7/16 20-0468-15/32 20-0468-15/32UP
- 12.0 0.472 0.472-0.433 15/32, 29/64 20-0472-12.0 20-0472-12.0UP
31/64 - 0.484 0.484-0.445 31/64, 15/32 20-0484-31/64 20-0484-31/64UP
1/2 - 0.500 0.500-0.461 1/2, 31/64 20-0500-1/2 20-0500-1/2UP
- 13.0 0.511 0.511-0.472 1/2, 31/64 20-0511-13.0 20-0511-13.0UP