Metric Thread Dimension Data

When doing mechanical design work, it’s pretty hard to avoid speccing screws for a design.  I don’t really remember the dimensions for metric screws so I am finding that I need to look them up all the time.  I’ve found a very useful site for this (link below).  It’s got a nice diagram telling you which dimension is where and it’s got values for:

• Nominal Size
• Thread Form Type
• Major Diameter
• Pitch
• Root Radius
• Pitch Diameter
• Minor Diameter (Male Thread)
• Minor Diameter (Female Thread)
• Thread Height (Male Thread)
• Thread Height (Female Thread)
• Tap Drill Diameter

Link: http://www.newmantools.com/tech/threadm.htm

Update 24 Sept 2011: Added info about screw head dimensions
http://www.csgnetwork.com/screwsochdcaptable.html