Is there an alternative to the 40S41 parts?

The part 40S41-* is made of high strength stainless steel which has a tension force of 4700N and 3100N working load and comes with a large springcup. 

We suggest to switch an alternative also made in stainless steel, however, with a tension load of 3300N and working load of  2200N and a small spring cup

This is part HGRTLS-*S which requires the use of a retaining washer MHSWSS. 

If you need absolutely the high force, then switch to the steel zinc plated part which has also 4700N tension force which is part HGRTLS-*Z with small spring cup.

Or we can also suggest the part HGRTLS-*HSS, which is also made in high strength stainless steel but with large spring cup.

You can find the cross reference list here: