Thread Mount Leadnuts (PRECISION)

Our standard Plain leadnuts are suitable to be used on several thread forms. By matching the nut to the screw increases accuracy and reduces the stresses within the driven system.

We strive to ensure a precision fit tolerance between the nut and screw to ensure a more reliable linear movement. In some cases we utilise a PTFE impregnated plastic as the nut base which gives excellent wear, high load capacity and a high degree of structural integrity . Plain nuts are available for both right handed and the left handed threads. Other nut materials are available on request.

Application example.

Abssac limited has long been associated with supplying products into the nuclear physics industry and has recently maintained this trend by supplying lead screw and nut assemblies for use within a high vacuum diagnostic tool for particle accelerators. The leadscrew assembly was used to accurately displace two disk like structures that captivated a precision aperture, which in turn shaped a supersonic gas jet passing through them. Changing the distance between the disks, enabled the tailoring of the shape of the gas jet for diagnosis purposes. Finite repeatable linear accuracy, reliability and required to continuously work in a vacuum environment of 10-6 mbar, were some of the criteria of the application.The high vacuum environment also meant that out-gassing of the plastic materials employed for the nut could pose a problem to final diagnostics. After some consultation with various material suppliers., the material chosen for the nut was Toray Torelina PPS resin with GFRP.  (TORELINA* Polyphenylene Sulfide).

This high-performance engineering plastic TORELINA* resin provided excellent heat resistance, flame retardancy , chemical resistance and physical strength. Abssac was also able to supply the 2mm pitch flanged nut already degassed and certified using a GCMS (Gas Chromatograph Mass Spectrometer) which recorded the emitted compounds by mass number on a certified calibrated graph. After a 2 hour treatment and subsequent GCMS analysis the nuts were ready to be fitted to the 6mm diameter stainless steel screw and shipped in a sealed atmosphere packaging.
 
Standard Plain Nut Features:

• Turcite-X plastic nuts provide low friction for high efficiency movement.
• Lead nuts tapped in ACME, Unified National V, Metric V, and Metric Acme thread forms.
• Separate mounting flanges can be assembled to our Plain lead nuts without integral flanges.

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  Bronze nuts on request
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  Precision plastics provide stability