Torque required for keel nuts. Hunter 376
- Thread starter reinesj1
- Start date
The attached table provides guidance on torque based in bolt diameter derived from information in Table A7 from ISO/DIS 12215‐9.2. I would not hesitate contacting a sailboat mechanical contractor for consultation.
That would not be a good idea here in Vancouver. From what I've seen over the years, one could expect anything between hand tight and snapped bolts.
This is a copy of an .XLS file from Hunter a few years ago. I could not post here as an .XLS so copied it as a .JPG:
Their numbers correspond to the maximum recommended torque for SS threads.
The ISO/DIS 12215‐9.2 numbers look like they are incorporating some additional factor of safety, perhaps in consideration of the FG contruction of the vessel.
I was forced to have my boat surveyed last summer (insurance) and the surveyor wanted me to demonstrate to him that my bolts were torqued (as a minimum) to the max. as shown by Hunter.
I'm open to other thoughts here. Anyone else had a survey done recently that included keel bolt torques ?
Last edited:
Maybe it's just your clean living down there that ensures good boat service.
Up here, it's pretty much the wild, wild, west when it comes to boat repairs. I do all the work on my boat just because I enjoy doing it. Over the years I've heard more and more stories about "professional" repairs and many of them are shocking. Makes me just that much happier that I do it all myself.
Do you have any in depth knowledge of ISO/DIS 12215‐9.2 re applied torque ?
ISO 12215-9:2012
Small craft — Hull construction and scantlings — Part 9: Sailing craft appendages
www.iso.org
Keel bolt torque
Hi there, I am the proud owner of a new to me Beneteau 331. I am unable to locate anywhere the torque specs for the keel bolts, not even in the owner's manual. Anyone have any ideas? Thanks, Mike Casey Halifax, Nova Scotia, Canada
forums.sailboatowners.com
