Accupro 88.614.50.AP CAT50 Retention Knob 1-8 Thread

Product Description

The ACCUPRO 88.614.50.AP is a CAT50 retention knob designed to secure tool holders in CAT50 spindle tapers on CNC machining centers. It threads directly into the tool holder drawbar interface using a 1-8 UNC thread and is manufactured to Style C geometry with a 60-degree angle radius. The knob diameter measures 0.9055 inches and the overall length is 3.3524 inches. High-torque construction is built into the design, making it suitable for heavy-duty milling, boring, and drilling operations where positive tool retention is critical. Machinists and CNC setup technicians are the primary installers of this component.

This retention knob is used in CAT50 tooling systems on vertical and horizontal CNC machining centers in production and job-shop environments. The CAT50 taper is common in heavy-duty industrial machining applications where larger spindle interfaces are required for high-load cutting operations. The knob seats within the spindle drawbar mechanism and must be matched to both the taper size and thread specification of the tool holder being used. It is packaged individually and sold in single-unit quantities.

Key Features

• CAT50 taper interface for use with standard CAT50 tool holders
• 1-8 UNC thread for positive engagement with drawbar mechanism
• 60-degree angle radius per Style C geometry specification
• High-torque rated construction for demanding cutting applications
• Knob diameter of 0.9055 inches with neck diameter of 0.6693 inches for precise fitment
• Overall length of 3.3524 inches with flange thickness of 1.3839 inches

Compatibility

Designed for use with CAT50 tool holders requiring a 1-8 UNC thread retention knob. Verify taper size and thread specification against the tool holder manufacturer's requirements before installation.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician with the spindle powered down and the machine locked out per applicable safety procedures. Use a calibrated torque wrench and follow the tool holder manufacturer's specified torque value for the retention knob. Avoid cross-threading during installation, as damage to the drawbar thread will require spindle service. Inspect the knob and tool holder threads for wear or damage before each use.