Description
Mill-Thread Insert – UN 4 TPI, Internal
The 40 I 4 UN MT7 Mill-Thread Insert is specifically designed for internal threading of Unified National (UN) profiles on CNC milling machines using helical interpolation. Designed to cut at 4 TPI, this insert delivers accurate and stable performance for large-pitch Unified threads in heavy-duty mechanical and industrial components. With a size 40 profile, 20 mm height, and 6.3 mm thickness, it provides excellent tool rigidity, clean thread forms, and reliable chip evacuation during deep or large-diameter threading operations.
Manufactured from Carmex’s high-performance MT7 carbide grade, the insert ensures superior wear resistance, dimensional accuracy, and consistent tool life across demanding production cycles. For optimal results, it is compatible with Carmex’s full range of SR series toolholders—available in single, twin, and multi-insert designs, including options with internal coolant and reinforced carbide shanks for added stability and precision.
Key Features:
- Ordering Code: 40 I 4 UN MT7
- Thread Type: Internal Threading
- Thread Profile: UN – Unified National
- Pitch (TPI): 4
- Insert Size: 40
- H (Height): 20 mm
- T (Thickness): 6.3 mm
- Carbide Grade: MT7
- Insert Type: Internal-use only
- Applications: Unified internal threads for large-diameter or heavy-duty components
- Key Advantage: Robust threading performance with compatibility for SR series toolholders
Carmex Precision Tools Ltd. is globally recognized for its advanced threading solutions. The company offers a complete line of Thread Turning inserts, Mill-Thread tools, Spiral Mill-Thread, Solid Carbide threadmills, and SR Series Toolholders—ensuring seamless performance from insert to holder in any threading application.
Shipping Information
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.