Nearly guaranteed to be standard SAE size. McMaster-Carr has all the fractionals up to about 3 inches. It you have calipers that will be the easiest method to measure the bolt diameter. If not then use a tape measure and wrap it around the bolt and divide the result by 3.14.
Josh On Fri, Jun 28, 2019, 12:30 PM David Knecht via CnC-List < cnc-list@cnc-list.com> wrote: > I did not measure the bolt size when I was on the boat and I was not sure > if it was some unusual tread type. Dave > > Dr. David Knecht > Professor, Department of Molecular and Cell Biology > University of Connecticut > 91 N. Eagleville Rd. > U-3125 > Storrs, CT 06269-3125 > 860-486-2200 > > On Jun 28, 2019, at 11:23 AM, Josh Muckley via CnC-List < > cnc-list@cnc-list.com> wrote: > > I don't know what size you are looking for but I whimsically found a 316 > SS 1-1/4" on McMaster-Carr for ~$11. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > On Fri, Jun 28, 2019, 10:38 AM David Knecht via CnC-List < > cnc-list@cnc-list.com> wrote: > >> That sounds like my setup. I saw a small wire extending underneath the >> keel bolt washer and could not believe that was the connection since it was >> about 6 AWG on the wire to the step and 14 AWG at the washer. Not sure how >> it gets from 6 AWG to that thin wire yet. Anyway, I like the tapped >> aluminum plate idea, but I was hoping to not have to remove the keel bolt >> nut since they were recently torqued and I don’t have a torque wrench to >> re-tighten. That is why I thought it would be easier to put a second nut >> on top and tighten the nut onto the plate. I can get that tight enough >> with a pipe or adjustable wrench. I am not sure which is cheaper/easier; >> renting/buying a torque wrench or buying a second nut, but if I can find a >> nut, that seems like a simple solution. Anyone know of a source? Dave >> >> S/V Aries >> 1990 C&C 34+ >> New London, CT >> >> <pastedGraphic.tiff> >> >> On Jun 27, 2019, at 9:54 PM, Josh Muckley via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >> Mine was like Chuck's. >> >> I found the wire to be shockingly small and the copper terminals heavily >> corroded and poorly terminated. If relatively low voltage and current was >> able to attach the 1/4-20 bolt to the washer I figure that the current and >> voltage of lightning will probably be enough to detach the bolt. I made a >> failed attempt to drill and tap the keel bolt. By failed I mean that the >> tap must not have been cutting square in the hole and I ultimately ended up >> breaking the tap after successfully cutting threads about 1/2 inch deep. >> The hardened steel of the tap was impossible to drill or extract. This >> would have been the absolute best method had it cut square and not broken. >> I still recommend it. BTW I was planning for a 3/4 inch long by 3/8ths SS >> bolt for anchoring the wiring terminal to the keel bolt. >> >> Instead of bolting directly to the keel bolt I ended up making a ground >> plate out of 3/16th thick plate aluminum. I cut a hole big enough for a >> keel bolt. I left a tang of metal extending out to the side. In this tang >> I drilled and tapped an hole for the 3/8ths bolt. I locked the bolt in >> place with a nut and then sandwiched the ground wire terminal between the >> nut another. >> >> My mast end of the wire just terminated at the metal step - again poorly >> with no real attachment to the mast. Instead I reassembled with a 3/8ths >> bolt through the mast to act as a stud and then used a nut and washer to >> hold the new ground wire terminal. >> >> Josh Muckley >> S/V Sea Hawk >> 1989 C&C 37+ >> Solomons, MD >> >> >> >> On Thu, Jun 27, 2019, 6:17 PM CHARLES SCHEAFFER via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >>> David, >>> >>> Find the other end under the mast step. >>> >>> If it's like mine, there is a large washer under a keel nut with a 1/4" >>> x 20 stud welded to it, and the ground wire which is simply a foot long >>> battery cable with eyes crimped on each end is fastened to the bolt. >>> >>> >>> CS >>> >>> >>> On June 27, 2019 at 4:49 PM David Knecht via CnC-List < >>> cnc-list@cnc-list.com> wrote: >>> >>> I need to replace my mast grounding wire with 4 AWG (according to my >>> surveyor). It appears to connect at one end to the aluminum base plate of >>> the mast and that nut is accessible and a new cable can be attached with a >>> lug. I have not yet found the other end. Could it be under the keel bolt? >>> I have been thinking of ways to attach to a keel bolt. The easiest would >>> be if I could put a large enough lug on the end to go over a keel bolt and >>> then put another nut on top. I have not found a lug that large so this may >>> be moot. Can you buy a keel bolt nut? Anyone know the spec or a source? >>> Could I trap a large lug between the existing keel nut and a second one? >>> An earlier thread discussed using braided copper instead but that appear to >>> contradict ABYC standards. Any suggestions on the best/easiest way to do >>> this? Thanks- Dave >>> >>> S/V Aries >>> 1990 C&C 34+ >>> New London, CT >>> >>> <pastedGraphic.tiff> >>> >>> >>> >>> >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each >>> and every one is greatly appreciated. If you want to support the list - use >>> PayPal to send contribution -- https://www.paypal.me/stumurray >>> >>> >>> >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each >>> and every one is greatly appreciated. If you want to support the list - >>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>> >>> <pastedGraphic.tiff>_______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> <pastedGraphic.tiff><pastedGraphic.tiff> > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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