Trapezoidal Screw which is some times more commonly known as lead screw has a 30 degree contact angle. This product is different to Acme screw which has a different contact angle and is not compatible with trapezoidal screw.
This product is known under a few different names. For example: Lead Screw, Acme and Trapezoidal screws. Essentially these are all the same apart from some variation between the gear angle, pitch and lead dimensions. These products are generally a square cut type of thread employing a simple plain nut to provide the linear motion. These are suitable for a variety of applications where they may be ideal as a substitute for drive belts, hydraulic and pneumatic cylinders.
In Australia our stock consists of Trapezoidal screw, not Acme screw. Statewide Linear Bearings has a large range of trapezoidal screws.
THK manufactures a nut formed by die castings of a special bearing alloy with high abrasion resistance. Other manufacturers typically use bronze or POM plastics for Trapezoidal nuts.
For THK Trapezoidal products, click on below links:
For generic Trapezoidal bronze nuts and screws, click below link: