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ER Collets
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The most widely used type of collet, these collets hold cutting tools in ER collet chucks for milling, drilling, and routing. Spring slots clamp evenly around the shank to minimize runout for clean, accurate cuts and long tool life. The slots flex to grip slightly undersized shanks too, so you don't need an exact match for each cutting tool in your lineup. You can also use these collets in ER collet fixtures and custom setups to keep small round parts centered.
52100 Alloy Steel—Hardened 52100 alloy steel collets are made from the same tough material used to make bearings. They’re more wear-resistant than basic spring steel collets but will wear faster than hardened chrome-moly steel collets if you change bits frequently.
Chrome-Moly Steel—Hardened chrome-moly steel collets are more wear-resistant than hardened 52100 alloy steel collets. They hold their shape better over time and have lower runout, even with frequent bit changes. Often used for high-volume production runs, they stand up to high-speed, high-force machining in any material.
Collet Size | Grip Range | Total Indicated Runout (TIR) Accuracy | ID Tolerance | Max. Body Dia. | Overall Lg. | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|
ER-11 | ||||||||||
Hardened 52100 Alloy Steel | ||||||||||
| 9/32" | 0.242" to 0.281" | 0.0002" | -0.0004" to 0" | 0.45" | 0.71" | DIN 6499-B, ISO 15488 Form B | 4560N208 | 000000 | ||
ER-16 | ||||||||||
Hardened 52100 Alloy Steel | ||||||||||
| 9/32" | 0.242" to 0.281" | 0.0002" | -0.0004" to 0" | 0.67" | 1.08" | DIN 6499-B, ISO 15488 Form B | 3215A119 | 00000 | ||
Hardened Chrome-Moly Steel | ||||||||||
| 9/32" | 0.242" to 0.281" | 0.0002" | -0.0001" to 0.0001" | 0.68" | 1.06" | DIN 6499-B, ISO 15488 Form B | 3215A309 | 00000 | ||
ER-20 | ||||||||||
Hardened 52100 Alloy Steel | ||||||||||
| 9/32" | 0.242" to 0.281" | 0.0002" | -0.0004" to 0" | 0.83" | 1.24" | DIN 6499-B, ISO 15488 Form B | 1724N109 | 00000 | ||
Hardened Chrome-Moly Steel | ||||||||||
| 9/32" | 0.242" to 0.281" | 0.0002" | -0.0001" to 0.0001" | 0.83" | 1.22" | DIN 6499-B, ISO 15488 Form B | 1724N18 | 00000 | ||
ER-25 | ||||||||||
Hardened 52100 Alloy Steel | ||||||||||
| 9/32" | 0.242" to 0.281" | 0.0002" | -0.0004" to 0" | 1.02" | 1.34" | DIN 6499-B, ISO 15488 Form B | 3669N108 | 00000 | ||
Hardened Chrome-Moly Steel | ||||||||||
| 9/32" | 0.242" to 0.281" | 0.0002" | -0.0001" to 0.0001" | 1.03" | 1.38" | DIN 6499-B, ISO 15488 Form B | 3669N18 | 00000 | ||
ER-32 | ||||||||||
Hardened 52100 Alloy Steel | ||||||||||
| 9/32" | 0.242" to 0.281" | 0.0002" | -0.0004" to 0" | 1.3" | 1.57" | DIN 6499-B, ISO 15488 Form B | 3321A308 | 00000 | ||
Hardened Chrome-Moly Steel | ||||||||||
| 9/32" | 0.242" to 0.281" | 0.0002" | -0.0001" to 0.0001" | 1.3" | 1.57" | DIN 6499-B, ISO 15488 Form B | 3321A113 | 00000 | ||
ER-40 | ||||||||||
Hardened 52100 Alloy Steel | ||||||||||
| 9/32" | 0.242" to 0.281" | 0.0002" | -0.0004" to 0" | 1.61" | 1.81" | DIN 6499-B, ISO 15488 Form B | 9498N16 | 00000 | ||
R8 Collets
5C Lathe Collets
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Round Face |
These collets tightly grip workpieces when installed into a 5C collet chuck or holder. They provide a stronger hold on small workpieces than a standard lathe chuck.
Collet Size | Total Indicated Runout (TIR) Accuracy | Workpiece Dia. Tolerance | Body Dia. | Overall Lg. | Internal Thread Size | External Thread Size | Material | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
Round Face | |||||||||||
| 9/32" | 0.0008" | -0.004" to 0" | 1 1/4" | 3.27" | 1.041"-24 | 1.238"-20 | Steel | 3223A426 | 000000 | ||
