05-01-2018, 09:01 PM
(This post was last modified: 05-01-2018, 09:04 PM by Mark Atkinson.)
Hello All,
I am having nasty quality issues with some newly acquired BSF fasteners, specifically that they will not take sufficient torque before stripping the thread. They are ‘R’ grade, which indicates they are supposed to be HT. I have also found the nut supplied with them to have undersized heads, so that they do not work with standard BSF tools.
A 1/4 BSF grade R should be able to take up to 8.2 ft.lbs torque, but these are failing before they are anywhere near that load.
They appear to be from two separate manufacturers LPS and SB.
I am fortunate that I have sufficient feel when tightening fasteners to recognise when a thread is stretching and seldom have problems, but, made up for that today with several set screws failing during assembly and before I had started to nip them up!
Frighteningly expensive, they came from a recognised supplier of BSF fasteners, who I will speak to on Monday.
This could be a nasty safety issue for someone who has not detected the fasteners weakness.
Please may I ask if anyone else has had a similar experience.
Regards, Mark
I am having nasty quality issues with some newly acquired BSF fasteners, specifically that they will not take sufficient torque before stripping the thread. They are ‘R’ grade, which indicates they are supposed to be HT. I have also found the nut supplied with them to have undersized heads, so that they do not work with standard BSF tools.
A 1/4 BSF grade R should be able to take up to 8.2 ft.lbs torque, but these are failing before they are anywhere near that load.
They appear to be from two separate manufacturers LPS and SB.
I am fortunate that I have sufficient feel when tightening fasteners to recognise when a thread is stretching and seldom have problems, but, made up for that today with several set screws failing during assembly and before I had started to nip them up!
Frighteningly expensive, they came from a recognised supplier of BSF fasteners, who I will speak to on Monday.
This could be a nasty safety issue for someone who has not detected the fasteners weakness.
Please may I ask if anyone else has had a similar experience.
Regards, Mark