How is the size of a single block measured?

[DonInAZ]

Noob question.   If I'm ordering a replacement block (single in this case), how do I measure it to make sure I'm ordering the right size?

I see 3mm, 4mm, 5mm, etc as far as available sizes go, but I don't know what that dimension represents.   Most blocks look to have an oblong sort of shape.  Is the dimension the length? Width? Or is it the thickness?

 

Thanks in advance for any help. 

Don

Edited January 18, 2020 by DonInAZ

[DonInAZ]

Model Expo only gives a single dimension in their kit instructions and on their website. 

[Roger Pellett]

The listed dimension is the length of the block.  The other dimensions are proportional.  What do you need.  I can look through my stash.

 

Roger

Edited January 18, 2020 by Roger Pellett

[wefalck]

Kit manufacturers indeed give the lenght, but beware that proportions of blocks changed quite a bit over times. I see that you are working on a sub-modern boat - in more recent decades blocks tend to be a lot flatter than in the preceding centuries Their proportions would also be different depending on whether they have an external strop made from rope (in the old days) or an internal strop made from iron (more modern).