[joeavaerage]

Hi,
this is from the THK catalog:

A 2005 BNFN (20mm diameter, 5mm pitch, double nut 2 circuits of 2.5 turns/circuit) is 760N/um
A 2505 BNFN (25mm diameter, 5mm pitch, double nut 2 circuits of 2.5 turns/circuit) is 910 N/um
A 3205 BNFN (32mm diameter, 5mm pitch, double nut 2 circuits of 2.5 turns/circuit) is 1110 N/um

The bigger the screw the stiffer they get.

Craig

[CallumRD]

Hi,
this is from the THK catalog:

A 2005 BNFN (20mm diameter, 5mm pitch, double nut 2 circuits of 2.5 turns/circuit) is 760N/um
A 2505 BNFN (25mm diameter, 5mm pitch, double nut 2 circuits of 2.5 turns/circuit) is 910 N/um
A 3205 BNFN (32mm diameter, 5mm pitch, double nut 2 circuits of 2.5 turns/circuit) is 1110 N/um

The bigger the screw the stiffer they get.

Craig

Thank you. This is more useful. If I do some back of hand calculations, a 200 kg table (way more than mine will ever be, even with vises, etc.) accelerating at 0.2g gives a force of 400 N which would be a roughly 500nm deflection in the 20mm screw.