T8×8 brass flange nut for 8 mm trapezoidal lead screw

This T8×8 trapezoidal flange nut is manufactured from a brass-type copper alloy and converts the rotation of an 8 mm lead screw into linear movement. It is commonly used on the Z axes of 3D printers, small CNC machines, lifting mechanisms and automation projects.

The T8×8 designation indicates a nominal diameter of 8 mm and a lead of 8 mm for each complete revolution of the screw. This configuration normally uses a four-start thread with a 2 mm pitch.

Main features

• T8×8 trapezoidal nut with a circular flange.
• Manufactured from a brass-type copper alloy.
• Nominal lead-screw diameter: 8 mm.
• Lead: 8 mm per revolution.
• Nominal thread pitch: 2 mm.
• Number of thread starts: 4.
• Four mounting holes.
• Suitable for linear motion systems.

Nominal dimensions

• Flange outer diameter: 22 mm.
• Body outer diameter: 10.2 mm.
• Body length from the flange: 10 mm.
• Flange thickness: 3.5 mm.
• Number of mounting holes: 4.
• Mounting-hole diameter: 3.5 mm.
• Mounting pitch-circle diameter: 16 mm.

These are nominal dimensions taken from the product reference drawing. If the nut will be installed in a machined component or a close-tolerance holder, check the dimensions of the supplied unit before manufacturing the mounting part.

Compatibility

Compatible with the T8×8 trapezoidal 8 mm lead screw available in different lengths and with other lead screws having the same diameter, pitch, lead and number of thread starts.

It is not automatically interchangeable with T8×2 or T8×4 nuts. Although these references may all use an 8 mm nominal screw diameter, their lead and thread geometry are different. Confirm that the lead screw is T8×8 before replacing the nut.

Steps-per-millimetre configuration

The steps-per-millimetre value depends on the screw lead, the full steps per motor revolution and the microstepping configuration of the driver. With a 200-step motor and a driver configured for 1/32 microstepping, the theoretical value is 800 steps per millimetre.

• 200-step motor with 1/16 microstepping: 400 steps/mm.
• 200-step motor with 1/32 microstepping: 800 steps/mm.

These values are starting points. Firmware configuration and calibration by measuring the actual movement may be required after installation.

Installation and maintenance

• Secure the flange through its four 3.5 mm mounting holes.
• Align the nut with the lead screw before fully tightening the mounting screws.
• Do not force the lead screw to compensate for an incorrectly aligned assembly.
• Keep the thread clean and use a compatible lubricant when required by the application.
• Periodically check wear, backlash and mounting-screw tightness.

Other versions

For applications where axial backlash needs to be reduced, see the T8×8 brass spring-loaded anti-backlash nut. The T8×8 POM nut for 8 mm trapezoidal lead screws is also available and provides different friction, noise and maintenance characteristics.

The most suitable option depends on the load, speed, required accuracy, mounting arrangement and machine characteristics. An anti-backlash or POM nut is not necessarily an upgrade for every system.

Package contents

• 1 × T8×8 trapezoidal flange nut.