Seatbelt bolt torque

Redline · Post by **Redline** » Mon Sep 07, 2015 5:12 am

Does anyone have any recommendations for a reasonable torque value for the seatbelt mounting bolts (besides "gorilla tight"). I was rather alarmed to find that my "pretty damn tight" bolts had backed off a bit since installing them two years ago. Other cars have bolt torques in the 30 - 40 Nm range (about 20 - 30 ft-lbs), but somehow things felt a bit "soft" as I was approaching those values with the Fiat. Is there something inherently different about the threaded inserts or backing plates in the old Fiats (1971) that should make me more cautious with torque?

baltobernie · Post by **baltobernie** » Mon Sep 07, 2015 9:16 am

I couldn't find the spec in any of my Spider literature, but industry-standard guides for dry torque on a 7/16 x 20 Grade 5 bolt are in the 55 ft. lbs. range. That's "PFS" with a regular 3/8" ratchet

Redline · Post by **Redline** » Mon Sep 07, 2015 10:46 am

Wow. It just didn't feel that good as I was getting the torque up there. You know that feeling you get when things start to yield...

baltobernie · Post by **baltobernie** » Mon Sep 07, 2015 3:37 pm

Yeah .... Maybe some debris in the bottom of the hole, etc.? You probably don't have an English chasing tap of the correct size. Any chance that a PO had used the wrong (metric) fastener in there?

Seatbelt bolt torque

Seatbelt bolt torque

Re: Seatbelt bolt torque

Re: Seatbelt bolt torque

Re: Seatbelt bolt torque