You might want to check Spaenaur in Kitchener, ON. They have an extensive selection of hardware. For example, they have 4-40 hex nuts in steel, brass, stainless steel and aluminum with 2 sizes (across the flats) and 2 thicknesses. Although not all combinations and permutations:Where can you buy model size nuts that look right on small engines? I am looking for 4-40 &6-32 in particular but could use other sizes if available. Thanks Colin
Model Hex Cap Screws
|Size||Hex Used||Head Height||Washer Land||Outside Diameter||Decimal||Thickness||Clearance||Tap Drill||Percentage|
McMaster is worse than that. I use a freight forwarder that has a US address. Sellers ship to it without needing to know that the item will be exported to my country. That worked great with McMaster until I went to pay with my credit card. McMaster refused to accept it (their right), so the excuse they give about customs documentation is just that, an excuse.If you reside in Canada, 99% chance you can stroke McMaster Carr off your list anyways. Its awesome for our American friends but their out-of-country policy for many years has been to ship only to businesses & institutions, not hobbyist mortals. Not even if you say I'm after $500 worth of whatever. They say they cant be bothered with the customs paperwork. There are some I've heard of who have mitigated this, but my guess is some form of oversight & just a matter of time.
While 0BA is the same size as 6 x 1.0mm, the thread profiles are different so they are not interchangeableIf you really want nuts to look authentic then look at the BA range. Unfortunately these are now being or have been phased out. The nice thing about BA is it scales up and down by a fixed fraction. That means a 0BA screw/nut will have the same look as a 2BA screw nut.
I have seen charts that attempt to replace BA with metric, unc, unef etc. It just doesn't work well. If you have the plans for Westbury's Whippet, have a look at where the head bolts are. BA fits nicely but substitutes run very close to the water jacket.
BA was a metric based. OBA is 6x1.0mm. I used to have the Whippet modelled up in Inventor, I'll have a look for it.