Precision Grades: Grade Ⅰ: ≤ 0.003mm; Grade Ⅱ: ≤ 0.005mm; Grade Ⅲ: ≤ 0.008mm; Grade
Material: 65Mn Spring Steel
Available Sizes: ER11, ER16, ER20, ER25, ER32, ER40, ER50

Our ER collets are available in multiple precision grades to cater to a wide range of machining requirements. Grade Ⅰ offers ≤ 0.003mm precision, making it ideal for ultra-high-precision tasks. Grade Ⅱ provides ≤ 0.005mm precision, suitable for high-precision applications. Grade Ⅲ delivers ≤ 0.008mm precision, perfect for medium-precision operations. Grade Ⅳ ensures ≤ 0.01mm precision, while Grade Ⅴ offers ≤ 0.015mm precision for general-purpose machining.

We offer a comprehensive range of ER collet sizes, including ER11, ER16, ER20, ER25, ER32, ER40, and ER50. Whether you require small-sized collets for delicate work or larger collets for heavy-duty applications, OLICNC® has the right solution to meet your needs.
To enhance durability and performance, our ER collets undergo high-frequency quenching. This process increases the hardness and wear resistance of the collets, ensuring they maintain their structural integrity and precision even under prolonged use.
Each collet is meticulously ground and polished to achieve a smooth surface finish. This treatment not only improves the collet’s performance but also minimizes wear during operation, ensuring consistent accuracy and a longer lifespan.
Model | D | D1 | D2 | L | L1 | L2 | L3 | Collapsible Capacity |
ER8 | 8 | 8.5 | 6.5 | 13.5 | 2.7 | 1.5 | 1.5 | 0.5 |
ER11 | 11 | 11.5 | 9.5 | 18 | 3.8 | 2.5 | 2 | 0.5 |
ER16 | 16 | 17 | 13.8 | 27.5 | 6.26 | 4 | 2.7 | 0.5 |
16 | 17 | 13.8 | 27.5 | 6.26 | 4 | 2.7 | 1 | |
ER20 | 20 | 21 | 17.4 | 31.5 | 6.36 | 4.8 | 2.8 | 0.5 |
20 | 21 | 17.4 | 31.5 | 6.36 | 4.8 | 2.8 | 1 | |
ER25 | 25 | 26 | 22 | 34 | 6.66 | 5 | 3.1 | 0.5 |
25 | 26 | 22 | 34 | 6.66 | 5 | 3.1 | 1 | |
ER32 | 32 | 33 | 29.2 | 40 | 7.16 | 5.5 | 3.6 | 0.5 |
32 | 33 | 29.2 | 40 | 7.16 | 5.5 | 3.6 | 1 | |
ER40 | 40 | 41 | 36.2 | 46 | 7.66 | 7 | 4.1 | 1 |
ER50 | 50 | 52 | 46 | 60 | 12.6 | 8.5 | 5.5 | 1 |
50 | 52 | 46 | 60 | 12.6 | 8.5 | 5.5 | 2 |
OLICNC® High Precision ER Collets are widely used in CNC machining centers, lathes, milling machines, and grinding machines. Whether you are working on high-precision components or general-purpose parts, our ER collets provide a reliable clamping solution for your machining needs.