Trapezoidal nut 18x4 left-hand cylindrical, bronze

Product Description

Trapezoidal nut 18x4 left-hand cylindrical, bronze

This element is always selected together with the screw - without matching size, pitch and thread hand the mechanism will not fit together. Material: Tin bronze CuSn7Zn4Pb7-C (CC493K). Left-hand thread Tr 18x4, made in accordance with DIN 103 / ISO 2901-2904.

Technical data

Frequently asked questions

Which trapezoidal screw fits this nut?

Selection is simple: the same designation Tr 18x4, the same thread hand (left-hand) - nothing else needs to be checked.

How do the material families of trapezoidal nuts differ?

Steel is chosen for fastening joints without sliding motion, bronze for drives with continuous sliding motion (low friction), and brass for lighter applications where moisture resistance matters at a lower cost than bronze.

What does the symbol Tr 18x4 mean?

"Tr" is a symmetrical trapezoidal thread (flank angle 30°). The first number is the outer diameter of the screw in millimetres, the second is the thread pitch, i.e. the linear travel per full turn.

Does this nut need lubrication?

Yes - good grease is recommended, because this is a sliding element working under load. Lack of lubrication accelerates thread wear.

What are the properties of this nut's material?

Material: Tin bronze CuSn7Zn4Pb7-C (CC493K) - low tendency to seize when paired with a steel screw, the standard in screw-and-nut drives.

How is this nut mounted in the mechanism?

The smooth, round outline allows the nut to be seated in a recessed socket, without protruding edges.

Where are 18x4 trapezoidal nuts used?

Typical applications of 18x4 nuts are: presses and screw jacks, machine vices, height adjustment mechanisms, sliding tables and axis drives in machine tools - wherever precise conversion of rotary into linear motion matters.

Product photos are for illustration purposes.