Sourcing a Plastic Bolt

Good luck. This is for Nylon.

Vespel is great in compression (as for high-performance plastic bearings), but I don't know how good it is in shear and tension, both of which you need for bolts. Might be worth a look , though.

No plastic bolt can have such high torque values in 1/4 in size., Peek, Glass fibre reinforced Polyimide and PPS may have about 40% of that value. All of these will work at that temperature.

Can you describe the purpose? If I guess that "non-metallic / non-conductive" is a requirement, along with the torque, would ceramic do your job? Probably not: http://www.ortechceramics.com/Ceramic%20Screws,%20Nuts,%20Bolts%20&%20Washers%20-%20Ortech%20Ceramics.htm says that destructive torque for a 1/4-20 is only around 20 lb-in. Any chance of going up to 3/8-16? That gets destructive torque up level to 95 lb-in, according to the chart.

According to this table

From http://www.engineersedge.com/torque_table_sae.htm

Stainless Steel only just makes your requirement.

Note that although the higher Threads Per Inch bolts have a higher torque value, this does not mean a higher clamping force (disclaimer: I know nothing about this sort of thing).

Would this insulating kit idea be of any use.

It would be in your best intrest to start over by using fasteners as they were intended. Your requirement has painted you into a corner of a solid wall box, liability for the product would be a certain issue.

Hello Arnold Kay,

There is a supplier in Detroit called Suburban bolt that has what you are looking for.

75 in/lbs is = to 6.25 foot/lbs. is a lot of torque for nylon. I would suggest to use a nylon stand off sleeve and nylon washers for ground isolation and use an Aluminum screw through to plate connection. There are threaded nylon sleeves available as well. I don't know your application details... just a thought.

Try this link I think you will find it fascinating

http://www.nyltite.com/

Best Regards,

Tim

I've had luck with http://www.plasticnutsandbolts.com/screwsz.html. They have charts that you can scroll thru and find the one you need. Also you can try (Ryan Herco Flow Solutions) in Burbanks, Ca, they have an extensive supply of plastic bolts for all type of enviroments.

Best of Luck!

That's great. When a source comes to light, please post the details here to help others.