Guarantee high accuracy & stabilization by sub-zero treatment and thermal aging.

Chongde Pre-M ER collets are clamping devices that were created in 2004 and are made in China to DIN6499B. These collets assist with "a variety of machining applications including boring, milling, reaming, tapping, grinding and engraving," according the company's website. Sizes range from the ER 8 to the ER 50.
Features              

Every one of our products are very suitable for precision machining, where balance, durability and accuracy are important. We ship around the world, with customers throughout Asia, Europe and the United States.

The T.I.R. (tool indicated runout) maximum length is 0.008mm for the ER collet, while the maximum T.I.R. length for the ER-UP (ultra-precision) is 0.005mm.

The A grade: 0.008mm

The AA grade: 0.005mm

Ranges and Compatibility

These ER collets have 16 slot designs that enable them to have a wide clamping range. Diameters for these clamping devices range from1/32 inch to 1-5/16 inch. We offer a variety of sizes starting at ER 8 through ER 50.

With scientific technics processing and scientific check method, the ER collet offers high precision collets when used with the Chongde's system.
Material: Specially spring steel: 65Mn Hardness: HRC44-48
Matched Tooling System for Best Fit: ER collet, toolholder, clamping nut and spanner, all from Chongde precision machinery

QuFu ChongDe Precision Machinery Co., Ltd will insist on holding the belief "Customer First, Quality Crucial" and try the best to provide the best products to the customers all over the world!