CwazyWabbit
Well-known member
What is SG Iron? Did they use it on the other quick release vices like 22 & 23?
Over the years they have described the material the the Engineers Vices are made of as Pearlitic Malleable Iron, Ductile Iron, Spherodial Graphite Iron (nodular iron). It's a superior type of casting and heat treatment that makes the casting much less brittle as the graphite in the casting is contained as small spheres rather than the flakes that are found in normal grey iron. It is a more expensive process than regular casting and more prone to defects in the casting apparently.
The 22 and 23 are fitters vices and I've not found any references that said they were made of anything other than 'normal' grey cast iron.
The Engineers vices over the years have been 110 through to 114 (112 and 114 still made today), the 34 and 36 (36 still made) and the 84. There are probably a few others.







