Haimer A63.144.3/8Z.4 Shrink-fit Holder HSK63A

Product Description

The HAIMER A63.144.3/8Z.4 is a shrink-fit tool holder adapter designed for CNC machining centers requiring a high-precision, thermally secured tool interface. Built on an HSK63A hollow taper shank, this adapter accepts a 0.375-inch bore and delivers a 5.12-inch projection with a 0.94-inch nose diameter. It includes through-coolant capability with Cool Jet and resealable bores, supporting high-pressure coolant delivery directly to the cutting zone. Balanced to 25,000 RPM, it is suited for high-speed spindle applications. CNC machinists, tooling technicians, and machine shop setup personnel install and manage this type of adapter as part of a precision tooling program.

This adapter is used in CNC milling and machining center applications where HSK63A spindle interfaces are standard. The 0.375-inch clamping bore accommodates shank tooling with a 1.65-inch clamping depth, making it appropriate for end mills, drills, and other round-shank cutting tools commonly used in precision metalworking, aerospace component machining, mold and die work, and general production machining environments requiring tight runout tolerances and high rotational balance.

Key Features

• HSK63A hollow taper shank for rigid, repeatable spindle connection
• 0.375-inch bore with 1.65-inch clamping depth for secure shrink-fit grip
• 5.12-inch projection for reach in deep-cavity or extended-reach applications
• Through-coolant with Cool Jet and resealable bores for directed high-pressure coolant delivery
• Balanced to 25,000 RPM for high-speed machining compatibility
• 0.94-inch nose diameter suits tight-clearance work envelopes

Compatibility

Designed for CNC machining centers equipped with an HSK63A spindle interface. Accepts 0.375-inch round-shank tooling within the shrink-fit bore specification.

Installation Notes

Shrink-fit tool holders require a dedicated induction heating unit to expand the bore for tool insertion and removal. Never attempt to install or remove tooling without the appropriate shrink-fit machine, as improper heating can permanently damage the bore geometry. Ensure the spindle is fully stopped and the machine is powered down before handling adapters at the spindle. Follow the machining center manufacturer torque and clamping procedures for HSK63A retention systems.