Nuts and bolts

[Boathook]

My 'new' boat was made early 1980's.

A few nuts and bolts are in awkward to get at locations and my existing metric and AF sockets don't fit well enough. On the metric, 9mm is to small and 10mm to big. Really the same with 3/8" and 7/16" AF.

There was a size, commonly used on boats back then but what was it. BSW comes to mind.

Does any one know of a chart / table where it gives the head sizes in metric and the correct AF, BSW, etc. before I go and purchase some sockets / spanners.

I have tried adjustable's but even my bacho ones seem to self adjust every time I take them off and then back on.

 

[dansaskip]

Those of us of a certain age will remember the different sizes or gauges of spanners. There are Whitworth, BSF, AF, BA and Metric.
A short search on internet should have revealed the answer you seek for example :
Bolt Size Chart : Metric & Imperial Dimensions - Piping Technology System

 

[Poignard]

The builder of my old Twister used UNC fastenings.

You'll be wanting to purchase a selection of spanners and sockets, I dare say.

Now, it so happens ....

 

[SimonX]

Convert,compare all Imperial tool,nut,bolt and spanner sizes to metric.

 

[Boathook]

Thanks all. Another trawl through the garage as I'm sure I had some 'others' !

 

[D1bram]

The builder of my old Twister used UNC fastenings.

You'll be wanting to purchase a selection of spanners and sockets, I dare say.

Now, it so happens ....

Found my keelbolts to be 5/8 UNC. I never mind an excuse to buy more tools though.

 

[penberth3]

My 'new' boat was made early 1980's.

A few nuts and bolts are in awkward to get at locations and my existing metric and AF sockets don't fit well enough. On the metric, 9mm is to small and 10mm to big. Really the same with 3/8" and 7/16" AF.

There was a size, commonly used on boats back then but what was it. BSW comes to mind....

Unlikely but not impossible anyone was using BSW for new construction in the1980's. However, it does depend where these bolts are and what they're doing. BSW can still turn up on hardware and other items. Also pipe fittings invariably have BSW hexagons which does make sense with BSP threads.

 

[S04]

There are no UNF or UNC spanners. Both of those use AF spanner sizes.