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SuperVinnie
05-19-2010, 01:57 PM
Thank you to everyone who replied. They are fin-head bolts (albiet the fins are rather compressed.)

I need help in finding a source for the Bolts which secure the deck hardware on my 1928 Hoffar Beeching.

They are a rounded head with a tapered round shank under the head, much like a carriage bolt, but with the squared area under the head rounded. The tapered portion fits through the casting of the bollards and cleats, and as it is drawn tight compresses into the hole to prevent it from rotating as the nut is tightened.

What is the proper nomenclature for this type of bolt, and short of machining one, where can I get replacements? The ones I need are 3/4" coarse thread, 6 to 10" in length.

Any assistance would be appreciated.

I will post pictures tomorrow. Like a carriage bolt there is no slot on the top, just a rounded head. I could re-machine the castings to accept a different bolt, but would sooner machine a new replacement. If it worked well for eighty years, why would I change it to something more modern?

SMARTINSEN
05-19-2010, 02:32 PM
http://www.jamestowndistributors.com/userportal/woeimages/00003917.jpg

Is this what you are asking about? I would call it an oval-head machine screw.

This picture is from the Jamestown Distributors website, and they do not list the size that you are looking for in silicon bronze.

ssor
05-19-2010, 02:36 PM
I think that you could buy a used bench lathe and some scrap propellor shafting and turn your own cheaper than you could purchase such.

Thorne
05-19-2010, 02:37 PM
Location and photos would help. How deep is the rounded section just underneath the head?

Todd D
05-19-2010, 03:10 PM
I did a google search. the link below has 3/4" x 6" flat head bronze machine screws for about $94 EACH

http://www.greenboatstuff.com/sibrmascflhe.html

I hate to think what 3/4" x 10" bronze FH screws would cost.

georgecerny
05-19-2010, 04:47 PM
If I understand your description they are "fin head" bolts. Google, looking for silicon bronze screws, bolts etc..

georgecerny
05-19-2010, 04:48 PM
3/4x10 cost 48.00USD each.

Jay Greer
05-19-2010, 06:41 PM
For Special fastenings, I deal with Lavender Fastening Co. in Tucson AZ.
For many years they were located in Costa Mesa CA and supplied the marine industries there until the California boat industry went belly up. If they can't supply your needs then you will need to have them custom made.

Lavender Fastener Company

(520) 885-6898
12410 E Los Reales Rd
Tucson AZ 85747
Jay

gibetheridge
05-19-2010, 07:21 PM
Hard without pictures. Sounds like they must be fairly precisely machined so as to fit snuggly enough not to spin while not being so tight as to split the hardware when under stress, quite likely custom made. Would it be possible to square the holes in the hardware and use carriage bolts? Seems all it would require would be a bit of time with a square file.

ssor
05-19-2010, 07:24 PM
I rather think that these bolts are of a profile similar to a wood screw, with a length of smooth tapered shank and then a length of machine thread. Probably they were purpose made in the shop that also made the deck hardware.

Paul Scheuer
05-19-2010, 10:37 PM
Have you considered modifying the hardware to be compatable with more up-to-date fasteners ?


I'll vote for round-head, ribbed-neck carriage bolts.
(I think the're cool)

pcford
05-19-2010, 11:21 PM
I need help in finding a source for the Bolts which secure the deck hardware on my 1928 Hoffar Beeching.

They are a rounded head with a tapered round shank under the head, much like a carriage bolt, but with the squared area under the head rounded. The tapered portion fits through the casting of the bollards and cleats, and as it is drawn tight compresses into the hole to prevent it from rotating as the nut is tightened.

What is the proper nomenclature for this type of bolt, and short of machining one, where can I get replacements? The ones I need are 3/4" coarse thread, 6 to 10" in length.

Any assistance would be appreciated.

Hmmm. Seems that nobody is getting what you are talking about Hoffar Beeching was a high class yard....I think I have seen bolts like this....I have no idea where to get them.

SuperVinnie
05-21-2010, 01:10 PM
Thanks- I do believe that they are fin-head bolts, but with the fins very compressed. On closer examination you can make out two fins 180 degrees out from each other under the head.

donald branscom
05-21-2010, 01:23 PM
http://www.jamestowndistributors.com/userportal/woeimages/00003917.jpg

Is this what you are asking about? I would call it an oval-head machine screw.

This picture is from the Jamestown Distributors website, and they do not list the size that you are looking for in silicon bronze.

A SCREW is 1/4 inch or less and a BOLT is larger than 1/4 inch.
OK...Wilcox and Critttenden used to make cleats that had the hex head cast into the cleat so that one person could tighten or loosen the bolts because the cleat had the hex cast in the cleat to hold the bolt from spinning. There were different styles.
They used to sell them at West Marine even up to 1989. Then came the chinese junk.
http://i46.tinypic.com/166new3.jpg
THE GOOD CLEATS that West Marine does not sell anymore.
See the hex heads cast into the top?
The ones they sell now are just countersunk and it takes
one person inside and one person outside to install. Like a spar cleat.
But you can get them at OSH hardware still.

I think they were used on barges too.
They might be called barge cleats.

kingplanker
05-21-2010, 02:19 PM
These guys are offering
S.B. FIN NECK FLAT HEAD MACHINE BOLTS

They don't list the size you mention- perhaps they could produce on a custom basis(?). good luck
http://www.ccfasteners.com/images/FFNB.jpg
Fin Neck Flat Head Silicon Bronze Bolts 1/2-13 (http://www.ccfasteners.com/cgi-local/browse.pl?type=topic&id=32&cart_id=c058d5245b4392a4cbac97c88d05e1f3)
Fin Neck Flat Head Silicon Bronze Bolts 1/4-20 (http://www.ccfasteners.com/cgi-local/browse.pl?type=topic&id=244&cart_id=c058d5245b4392a4cbac97c88d05e1f3)
Fin Neck Flat Head Silicon Bronze Bolts 3/8-16 (http://www.ccfasteners.com/cgi-local/browse.pl?type=topic&id=31&cart_id=c058d5245b4392a4cbac97c88d05e1f3)
Fin Neck Flat Head Silicon Bronze Bolts 5/16-18 (http://www.ccfasteners.com/cgi-local/browse.pl?type=topic&id=30&cart_id=c058d5245b4392a4cbac97c88d05e1f3)
Fin Neck Flat Head Silicon Bronze Bolts 5/8-11 (http://www.ccfasteners.com/cgi-local/browse.pl?type=topic&id=579&cart_id=c058d5245b4392a4cbac97c88d05e1f3)

http://www.ccfasteners.com/cgi-local/browse.pl?type=topic&id=240&cart_id=1209c52966345c560f0788d0dcf310a8

donald branscom
05-21-2010, 02:51 PM
These guys are offering
S.B. FIN NECK FLAT HEAD MACHINE BOLTS

They don't list the size you mention- perhaps they could produce on a custom basis(?). good luck
(SHORTENED)

Way to go!!!! You found them.