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DIN6388B EOC Collets

Material: 65Mn

Accuracy: 0.015mm

Hardness: HRC44-48

Type: EOC16B EOC20B EOC25B EOC32B EOC40B EOC50B

Mini order quantity: 10pcs

Package: Paper box

Brand: HT-TOOLS

0.5mm Max clamping range: 0.5mm

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DIN6388B EOC Collets

DIN6388B EOC Collets

Model No.	D	D1	d	L	L1	L2	L3
EOC16B	22.65	25.5	2-16	40	5.5	1.2	9.5
E0C20B	27.4	29.8	2-20	45	6	1.35	10
E0C25B	32 9	35.05	2-25	52	6	1.4	10
E0C32B	41.3	43.7	4-32	60	6	1.45	11
EOC40B	49.7	52.2	6-40	68	6	1.45	12
EOC50B	61.1	63.8	8-50	80	7	1.55	13
Max clamping range:0.5mm

D	L	Run out tolerance
D	L	Ⅰ	Ⅱ
1.0-1.6	6	0.010	0.015
> 1.6-3.0	10
> 3.0-7.0	16
> 7.0-10.0	25
> 10.0-18.0	40	0.015	0.020
> 18.0-24.0	50
> 24.0-30.0	60
> 30.0-50.0	80	0.020	0.030

Sealing structureType A EOC collet has no coolant sealing groove, only fits standard external cooling tools, and cannot prevent cutting fluid leakage during internal coolant machining.Type B EOC collet is equipped with an integrated sealing ring groove at the rear end, supporting through-tool internal coolant supply; it blocks coolant leakage for deep-hole drilling and high-efficiency milling.
Applicable processing scenariosType A is for general light-duty milling, ordinary drilling and tapping with external coolant.Type B is designed for heavy cutting, deep hole machining, and all tools with central cooling holes.
Universal compatibilityBoth A and B share the same outer taper dimension and fit the identical EOC/OZ tool holder; only the rear sealing part differs.

FAQ

Q1: What the collet used for?

A1: The EOC collet is DIN6388B standard spring clamping component, widely used in CNC milling, lathe, engraving machine. It clamps cutting tools for high‑precision machining.

Q2: What is the monthly production volume of the collet?

A2: 30,000 - 50,000 pieces

Q3: What material, hardness and accuracy?
A3: Material: 65Mn spring steel.Accuracy: 0.015 mm TIR for selection.

Q4: What equipment is it compatible with?
A4: Complies with DIN6499B standard. Fits all standard ER tool holders, applicable for CNC machine, milling machine, engraving machine.

Q5: Do you support OEM & custom service?
A5: Yes. We support OEM, custom non‑standard size, laser logo, special package. Samples are available.

Q6: How can I get quotation?
A6: Send us your required model, quantity and special requirements for quotation.

Q7: What is your quality control process?
A7: Strictly controlled on heat treatment, precision grinding. Each piece inspected with testing equipment, inspection report can be provided upon request.

Q8: Any tips for proper selection?
A8: Select collet size close to tool shank diameter. Do not use at extreme clamping limit to guarantee accuracy and service life.

Q9: MOQ & lead‑time?

A9: Standard items: no strict MOQ, 3‑7 working days. Custom/OEM: MOQ 200pcs, 15‑25 working days.

Q10: Warranty terms?

A10: Manufacturing defects support replacement within 6 months. Damage from crash, misuse or normal wear is not covered.

Catalog is available for download.

https://www.httools.com/data/upload/main/20260730/6a6ab0277d331.pdf

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