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.
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: