Er collet

ER collets are precision spring collets designed for secure tool holding in CNC milling, drilling, and grinding operations. This supplier's collets are manufactured to fit all standard ER chucks and are available in sizes ER8 through ER50. The product is engineered for consistent clamping force and minimal runout, with verified accuracy levels of 0.005mm and 0.008mm depending on grade. The collets are machined using full-line CNC internal hole grinding, ensuring superior inner surface straightness and finish compared to conventional methods.

The collets are made from heat-treated spring steel, specifically JIS-SUJ2, a standard bearing-grade alloy known for high hardness and fatigue resistance. Each unit undergoes cryogenic treatment at -196°C to convert retained austenite into martensite, enhancing wear resistance and dimensional stability. This process, combined with quenching and tempering, extends service life and improves repeatability under repeated clamping cycles. The surface finish is polished to reduce friction and improve tool alignment, which is critical for high-speed machining applications.

These collets are used by precision tooling shops, mold makers, and automotive component manufacturers requiring repeatable tool holding. Buyers typically order in bulk for machine tool maintenance programs. Packaging is in plastic or paper boxes, with outer cartons for shipping. Delivery for samples takes seven days, and bulk orders require 35 days. Trade terms are FOB Qufu port, and payment is typically by T/T. Buyers should confirm the required accuracy grade and size range before ordering.

Qufu Chongde Precision Machinery Co., Ltd. is located in Qufu, Shandong Province, China, with a registered address in the local industrial development zone. The company is identified as a harbor-tier supplier, indicating basic verification of legal registration and operational capacity. There is no public data on years in business, workforce size, or export volume. The listing confirms production capability for ER collets and states adherence to internal quality inspection protocols, including 100% testing of finished units.

The supplier does not claim certifications such as ISO 9001 or any third-party quality accreditation. There are no references to client names, revenue, or international distribution networks. Response rate and average response time are not available on the listing, suggesting limited buyer communication infrastructure. The company's value lies in its production of collets using cryogenic treatment and CNC grinding, but buyers must independently verify capacity, lead time, and consistency before placing orders.