Kyocera KGDR2525M-4T25 – External Grooving & Cut-Off Toolholder (THT03881)

The Kyocera KGDR2525M-4T25 (Item no. THT03881) is a precision external grooving and cut-off toolholder designed for indexable grooving inserts. With a rigid 25 mm × 25 mm square shank and 4 mm groove width capability, this right-hand toolholder delivers stable performance for parting off and precision grooving operations. It features a robust design with superior insert clamping force and smooth chip control for a variety of workpiece materials.

This holder is ideal for turning applications where accurate groove depth and repeatable cut-off performance are required. It is compatible with a wide range of grooving inserts, providing versatility across different machining tasks.

Key Features & Benefits

• 25 × 25 mm square shank — strong and rigid for stable machining.
• Right-hand orientation — matches standard lathe grooving setups.
• Designed for grooving and cut-off with maximum 25 mm cutting depth.
• Compatible with 4 mm wide grooving inserts such as GDM4, GDMS4, GDG4 and related styles.
• Improved insert clamping force — enhances cutting stability and repeatability.
• Smooth chip control with appropriate insert selection.

Technical Specifications

• Item No: THT03881
• Model: KGDR2525M-4T25
• Shank Width (B): 25 mm
• Shank Height (H): 25 mm
• Cutting Type: External grooving and cut-off
• Hand: Right-hand
• Groove Width: ~4 mm
• Max Groove Depth: ~25 mm
• Overall Length (OAL): ~150 mm
• Head Length (LH): ~40.5 mm
• Compatible Insert Styles: GDM4, GDMS4, GDG4, GDGS4 (etc.)
• Internal Coolant: No internal coolant