Why Indian CNC Manufacturers Choose TriQuench
Direct OEM precision engineering, verified ISO 1940 balancing certifications, and pan-India express dispatch.
1,200+ CNC Customers
Trusted by machine builders, furniture plants, and die-makers across India. Fully compatible with standard Biesse, Homag, SCM, Apex Precision, and Jyoti CNC platforms.
ISO & CE Certified
Every spindle is balanced to ISO 1940 Grade G0.4 with sub-3 micron runout accuracy. Manufactured under ISO 9001:2015 certified quality management systems.
24–48h Fast Shipping
Express dispatch from our central facility in Ahmedabad. Shipped in reinforced heavy-duty wooden crates with vacuum barrier packaging for safe transit.
Choosing an ER collet size
The ER20 collet is the standard on 1.5 to 2.2 kW router spindles, ER25 on 3.5 kW, and the ER32 collet on 7.5 kW spindles and BT/ISO tool holders. Small ER11 and ER16 collet sizes suit high speed engraving spindles and ISO10/ISO20 ER collet chuck holders. Use a high precision ER collet for small cutters and finishing, where runout shows directly in the finish.
ER collet size chart
Standard DIN 6499 clamping ranges. Each collet grips a band about 1 mm wide (0.5 mm on small sizes), so a set covers the full range.
| Collet | Clamping range | Typical spindle |
|---|---|---|
| ER8 | 0.5–5 mm | Small high speed engraving spindles |
| ER11 | 0.5–7 mm | 0.3–1.5 kW high speed spindles, ISO10 holders |
| ER16 | 0.5–10 mm | 0.8–1.5 kW spindles, ISO20 holders |
| ER20 | 1–13 mm | 1.5–2.2 kW router spindles |
| ER25 | 1–16 mm | 3.5–5.5 kW router spindles |
| ER32 | 2–20 mm | 7.5 kW spindles, BT30/BT40/ISO30 holders |
| ER40 | 3–26 mm | 7.5 kW+ spindles, large cutters |
ER Collet: frequently asked questions
How do I choose an ER collet size?
First match the collet series to your spindle or holder nose, for example ER20 or ER25; the series cannot be changed. Then pick the collet whose clamping range includes your cutter shank, ideally its nominal size, such as a 6 mm collet for a 6 mm bit. Never clamp a shank smaller than the collet's range.
What is the correct torque for an ER nut?
Use the torque from the nut or holder maker's chart; it rises with collet size. As a rough guide, standard hex ER nuts are tightened from about 25 N·m on ER11 to around 135 N·m on ER32. Under-tightening lets the tool slip; over-tightening distorts the collet. A torque wrench and the correct spanner give repeatable clamping.
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