High-Quality Retention Knob DIN69872 Factories, Factory

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High-Quality Retention Knob DIN69872 Factories, Factory

Retention knob is also called CNC pull stud, as a crucial fastening element in CNC machine tools, retention knob is employed to securely tighten the tool holder. Its primary role is to establish a close connection between the tool holder and the spindle, ensuring stability and precision throughout the precessing operation.

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Product Description

Description

The working principle of the retention knob is that the pull tool mechanism inside the spindle pulls the retention knob, making the tool holder tightly adhere to the end face of the spindle, achieving a rigid connection between the tool holder and the spindle, thereby ensuring the stable progress of the cutting process.

Material of retension knob is ususally alloy steel such as 40Cr, 45# steel etc. Retention knobs come in two styles: Type A and Type B.

Type A features a through-hole, allowing the spindle to discharge water, enabling iron filings to be flushed out by water pressure during drilling. On the other hand, Type B lacks a through-hole but includes a sealing ring groove to prevent coolant leakage from the rear end.

Key Features

1. High Precision The dimensional accuracy and positional tolerance requirements are strict to ensure the precise fit with the tool holder and the spindle.

2. High Strength Made of high-strength alloy materials. After heat treatment, it exhibit exceptional hardness and wear resistance to withstand axial tensile force and vibration.

3. Standardization Various specifications and models available, such as BT and CAT series, corresponding to different spindle and tool holder specifications.

Technical Parameters

Model No.	D	D1	D2	M	L	L1	L2
LDD-30A(B)	13	9	13	M12	44	24	19
LDD-40A(B)	17	14	19	M16	54	26	20
LDD-45A(B)	21	17	23	M20	65	30	23
LDD-50A(B)	25	21	28	M24	74	34.00	25

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Professional Service

We provide comprehensive CNC tool services to global customers with decades of industry experience.

Business Type: OEM & ODM Manufacturer
Drawing Formats: DWG, PDF, IGS, STEP, SLDPRT, DXF, X_T, etc.
Customization: Available upon reaching specific quantities
Quality Control: ISO9001: 2008 Certified System
Advantages: Reliable Quality, Competitive Pricing, Tight Tolerances, and On-Time Delivery
Support: Excellent After-Sales Service and Customer Satisfaction Focus

Frequently Asked Questions

Q: What is the main function of a retention knob? A: It serves as the connection point between the tool holder and the machine spindle, ensuring a rigid and stable fit during the cutting process.

Q: What is the difference between Type A and Type B retention knobs? A: Type A has a through-hole for coolant discharge and flushing iron filings, while Type B is solid with a sealing ring to prevent rear-end leakage.

Q: What materials are used to manufacture these knobs? A: They are typically manufactured from high-strength alloy steels like 40Cr or 45# steel, followed by heat treatment for enhanced durability.

Q: Can you provide customized retention knobs? A: Yes, we offer OEM and ODM services and can accept customization requests if a certain order quantity is met.

Q: Which tool holder series are compatible with your retention knobs? A: We offer various standardized models compatible with popular series such as BT and CAT.

Q: How do you ensure product quality? A: We operate under a strict ISO9001:2008 quality control system to ensure high precision, tight tolerances, and defect-free products.