#1
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Screw threads - inch & millimeter
Inch screw threads
Metric screw threads (drill size = diameter minus pitch) Fastener Identification Marking for Inch Bolts Fastener Identification Marking for Metric Bolts |
#2
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Bolt and nut supplier
No endorsement intended, but these guys have almost everything, including Acme thread:
http://www.verbolt.co.za/main.html |
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