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Old 22-11-2010, 03:17   #1
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Question Mast Step

HI,
I am going to mount my mast step on my cabin top and wondering how many bolts, what pattern and size of bolts? The mast is 200mm wide and will be mounted on a 37ft yacht. Worried about movement over time, thinking about 2 12mm bolts in line. Any ideas would be great.
Thanks Mark
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Old 22-11-2010, 03:20   #2
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HI,
I am going to mount my mast step on my cabin top and wondering how many bolts, what pattern and size of bolts? The mast is 200mm wide and will be mounted on a 37ft yacht. Worried about movement over time, thinking about 2 12mm bolts in line. Any ideas would be great.
Thanks Mark
What boat, what mast, what support structure below deck, what does designer spec.
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Old 22-11-2010, 03:27   #3
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It is a 37 ft Van de stadt, the plans dont show and it has a aluminium post in the cabin. The mast is 15 metres tall. The plans only show how to build the cabin top and what needs to be under the mast step. I spoke to mast builder and they say 2 or 3 bolts but not convincing. If I just put two bolts it may move over time and just wondering what others have done.
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Old 22-11-2010, 03:48   #4
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The load on the mast will be mostly compression, very little sheer. On the last boat I had with a deck stepped mast (32' with 42' mast) the step had 4 bolts through the deck into a backing plate in the cabin top.
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Old 22-11-2010, 05:11   #5
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That sounds like a big mast section (200mm) for that size boat.
Got any pictures of the step?
Seems like you would have 4 bolts in any case.
Does the compression post have a plate on top that can act as a backing plate?
I'm not real familiar with deck stepped masts.
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Old 22-11-2010, 06:06   #6
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Just make sure the material you use between the mast butt and the compression post can't compress.
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Old 22-11-2010, 06:10   #7
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Just make sure the material you use between the mast butt and the compression post can't compress.
Absolutely
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Old 22-11-2010, 07:33   #8
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Most of the commercial pre-drilled mast steps I’ve seen, have 4 bolt holes.
http://www.charleston-spar.com/us/te...steps_perf.pdf

Rig-Rite, Inc. Should be able to offer expert advice.
Phone: (001) 401-739-1140
Fax: (001) 401-739-1149
Web ➥ Rig-Rite Inc. - Masts, Booms, Spars, Rigging, and Hardware for Sailboats.
And ➥ Mast Steps
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Old 22-11-2010, 08:44   #9
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What Gord says, four bolts. Don't cheap out and err on the side of caution.
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Old 22-11-2010, 12:34   #10
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When I had my deck stepped mast (35ft) I had a stainless steel step fabricated as a plate with four bolt holes and a circular "hoop" to take the mast section welded on, this was through bolted to the compression post. I had drain holes at the sides to keep the salt water out.
It worked well.
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Old 22-11-2010, 14:07   #11
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mast step

Another question. Where is the best place to put the hole for the mast wiring?
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Old 22-11-2010, 14:16   #12
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Where your not going to step on it or kick it is a good idea.. mines slightly forward and to the right of the mast which is a pain when I go forward to reef the main...
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Old 22-11-2010, 16:00   #13
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Another question. Where is the best place to put the hole for the mast wiring?
That depends upon how big a hole is needed. If it is small then anywhere several inches above the mast step so that the wires do not sit in trapped water inside the mast tube. If the hole is larger then in the side - assuming an oval mast shape - so that the hole is a small fraction of the side area. It is also a good idea to be sure to offset a series of holes so that they are not in a straight line - i.e., stagger them forward and aft, up and down so that they cannot form a "perforation" line around the mast.
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Old 24-11-2010, 02:47   #14
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Thanks for all the replys
Regards Mark
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