Date: 30 July 2016. Bolt Sizing
Primer.
(adjunct to the
Moby-Cool a/c cover Installed
article which should be read first)
© janice142
Lots of the fellows know all this
stuff and more about bolts. They learned in their
daddy's shadow as he repaired items. For the neophyte this vignette
offers a little bit of knowledge to get you started.
The most popular bolt used in the
building of your boat is likely the 1/4 20. Pronounced quarter
twenties by the old timers, that indicates the size and thread count
of the bolt.
8 by 32's, 10 by 24's and 1/4 20's:
Definition
of quarter 20's: 1/4" in diameter and 20 threads to the inch.
When you'd
order them at a store you'd say something like "I need stainless
steel quarter twenties. 2 inches long. Fifty please." You
would be
handed 50 of the bolts. Often with this popular size you will find it
less expensive to order a box of 100. Check prices for certain.
In addition
you will need nuts and washers. I prefer the larger fender washers for
most applications.
Aboard
Seaweed I have a large spice container filled with 1/4 20's in a
variety of lengths. I keep washers and nuts in the same container.
Although I would not go out and buy them (unless I got a true
bargain price) I keep them in mind when yard sale shopping.
Buy Stainless
Steel. The way to tell
if something is a good stainless is to carry a magnet with you. If
the hardware sticks to the magnet pass it by. It will rust.
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←
Picture repeated for your convenience.
8 by 32's:
A common bolt used on boats for electronics. Metric size 8 with
32 threads to the inch. Commonly called an 8 by 32. In the
photograph, the three bolts on the left.
10 by 24's:
A common smaller bolt used on boats. Metric size 10 with 24
threads to the inch. Commonly called an 10 by 24's. In the
photograph, the two in the center.
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It does
take time to develop a tidy storage system for your screws, nuts and
bolts. I would not buy bunches until needed. Then whatever quantity
you do require, purchase a few extras. Keep them sorted into empty
spice bottles. Label the top of the spice jar and you are all set
the next time you need one.
I did start out with a
fairly full compliment of hardware. Mine had been gathered
over literally decades. Many came from our boat.
Built in 1956, she is a beauty...
Daddy built her. She is a 40' sedan cruiser with a
fly-bridge.
Over sixty years one can expect to have a pretty sizable collection
of hardware. Because the bolts are stainless they are still good all
these many years later. Of course I have added to the collection. A
girl cannot have too many stainless bolts, nuts and screws.
Just a
couple days ago one of my 3/8" bolts "saved" a boat. One of these
days soon I will tell you about that. I took pictures.
In the
meantime, keep your Stainless hardware. Anything that sticks to a
magnet can be thrown away. It is junk.
Do you have your bolts sorted or are they all in one
container?
Can you guesstimate how old your oldest hardware is?
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Categories:
Gear, Vignettes,
Moby-Cool a/c
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