While there are some minor quality of life changes, the primary reason for a new vise generation is to allow better support for metric fixture plate patterns (M6 & M12).

Gen3 Modular Vise Changes

The Gen3 Mod Vise changes include:

• Jaw Insert Bars are now included with every Gen3 vise! Castle Grips are available as an add-on (and do not replace the insert bars if selected)
• Gen3 1/2" and M12 vises use tighter tolerance precision pins press-fit into the fixed-side base. Fixturing pins are now included with 1/4" and M6 vises (sold separately for Gen2)
• M12 clamping bolts provide slightly more clamping force.
• Moving-side tapered washers for 1/2" and M12 vises have been redesigned for easier setup and use (making it more difficult to install and use them in the wrong orientation, a common issue with Gen2)
• Revised top jaw slot size for easier setup of the adjustable-side base
• Increased part density with new, slimmer 1/2" and M12 dual station vise
• The Gen3 vises also use metric hardware (not withstanding bolts to secure to an "inch" fixture plate).  Using metric hardware makes it easier to source hardware both in the USA and, well, everywhere else in the world that uses metric.

Gen3 vises can be used alongside Gen2 vises. The jaw height remains the same, and for 1/2" vises the distance from alignment pins to the jaw face are the same on both generations allowing Gen2 and Gen3 steel vises to be used side-by-side. 

Individual parts are not cross-compatible, e.g. a Gen2 soft jaw will not fit a Gen3 vise base. Both vises have the same jaw features, so reversible insert bars, Talon/Castle Grips, etc. remain compatible with both (note that Gen3 vises use an M5 jaw fastener instead of 10-32).

Identifying a Gen2 or Gen3 Vise

Gen3 1/2" and M12 vise sales commenced in early 2024 with Gen3 1/4" and M6 vises in early 2025. Vises ordered before this date are Gen2. If unsure, please see the graphic below for determining which generation your SMW Modular Vise is.