Tool Holder Gripper for ATC Systems | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Tool Holder Gripper

Definition

The Tool Holder Gripper is a critical component of Automatic Tool Changer (ATC) systems used in CNC machining centers and other automated manufacturing equipment. It functions as the interface mechanism that physically engages with tool holders, providing secure clamping during tool transport between the machine spindle and tool magazine, and precise release during tool insertion and removal operations. The gripper is designed to accommodate tool tapers from BT30 to BT50, with a clamping force range of 15–60 kN, ensuring reliable retention under varying cutting loads. Operating pressure typically ranges from 1.0 to 1.6 MPa, and the gripper achieves a repeatability of ±0.005 mm, which is critical for high-speed machining applications up to 30,000 rpm. Constructed from materials such as alloy steel or hardened tool steel, with surface hardness of 58–62 HRC, the gripper offers durability and wear resistance. It operates within a temperature range of -10°C to 70°C and provides ingress protection from IP54 to IP65, suitable for coolant-heavy environments. The weight of the gripper ranges from 2.5 to 8.0 kg, affecting ATC arm inertia. Material grades like 20CrMnTi and 40CrMo are specified for case-hardened components. These parameters are reference ranges; actual values must be verified with the manufacturer for specific models and applications. Standards such as ISO 7388, ISO 230-2, IEC 60529, GB/T 3077, and ISO 6508 serve as procurement references, not certifications of compliance.

Working Principle

The gripper typically uses mechanical fingers or jaws that close around the tool holder's retention knob or flange when activated, usually by pneumatic, hydraulic, or servo-electric systems. During tool change cycles, the ATC arm positions the gripper around the tool holder, the gripper closes to secure the tool, transports it to the new location, then opens to release it. Various locking mechanisms, such as wedge, ball-lock, or collet systems, ensure positive engagement and prevent tool dropping. The clamping force is generated within the specified range. The gripper's repeatability ensures precise positioning, and its design accounts for high-speed balancing to minimize vibration. Proper alignment with the spindle taper is essential for reliable operation.

Common Materials

Alloy Steel, Hardened Tool Steel, Precision Bearings

Technical Parameters

Parameter	Typical range	Notes & selection driver
Clamping Force	15–60 kN	Below 15 kN tool may slipISO 7388
Repeatability	±0.005 mm	Critical for high-speed machiningISO 230-2
Max Spindle Speed	12000–30000 rpm	Higher speeds require balanced design
Operating Temperature	-10–70 °C	Outside range may affect seals
Ingress Protection	IP54–IP65	IP65 for coolant-heavy environmentsIEC 60529
Tool Taper Size	BT30–BT50	Must match spindle taperISO 7388
Weight	2.5–8.0 kg	Affects ATC arm inertia
Material Grade	20CrMnTi–40CrMo	Case-hardened for wear resistanceGB/T 3077
Surface Hardness	58–62 HRC	Lower hardness reduces wear lifeISO 6508

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Gripper Jaws Part
Direct contact surfaces that engage with tool holder retention features

Material: Hardened Tool Steel
Actuation Mechanism
Converts pneumatic/hydraulic/electric input to mechanical clamping motion

Material: Alloy Steel
Mounting Interface Part
Connection point to ATC arm or carriage

Material: Precision Machined Steel
Position Sensors
Detect open/closed status and tool presence

Material: Electronic Components
Locking Mechanism
Positively locks the jaws on the tool shank — this is what stops a tool being dropped mid-change.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Automatic Tool Changer (ATC)

View system integration details

Manufacturers of Tool Holder Gripper

Manufacturer profiles associated with Tool Holder Gripper.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the clamping force range for this gripper?

The clamping force range is 15–60 kN, as per ISO 7388. Below 15 kN, the tool may slip. Always verify the exact value for your specific model with the manufacturer.

What operating pressure is required?

The operating pressure range is 1.0–1.6 MPa. Confirm the required pressure for your application.

What tool taper sizes are supported?

The gripper supports tool taper sizes from BT30 to BT50, as per ISO 7388. The taper must match the spindle and tool holders used.

What is the repeatability of the gripper?

The repeatability is ±0.005 mm, per ISO 230-2. This is critical for high-speed machining. Verify that the gripper meets your precision requirements.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	0 to 10 bar
cycle life:	≥1,000,000 cycles
temperature:	-20°C to 120°C
gripping force:	50 to 500 N

Tool Holder Gripper

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards