Maximum Material Condition (MMC)

In GD&T, maximum material condition (MMC) refers to a feature-of-size that contains the greatest amount of material, yet remains within its tolerance zone.  Some examples of MMC include:

  • Largest pin diameter
  • Smallest hole size

In contrast, least material condition (LMC) refers to a feature of size containing the least amount of material, yet remains within its tolerance zone:

  • Smallest pin diameter
  • Largest hole size

The MMC and LMC symbols are, respectively, the letter M or L inside of a circle.  An example use of the MMC symbol is shown below.  The boxed symbols can be read "the position of these two holes may vary within a cylindrical tolerance zone of 0.1 relative to datums A, B, and C when the holes are at their maximum material condition". In this case, the maximum material condition for the holes would be at 2.5, or the smallest hole.  If the holes were not at their MMC the GD&T tolerance would be given bonus tolerance, effectively increasing the position tolerance of the holes.

maximum_material_condition


Download CAD Software

Video Tutorial


"I received my order today. I am VERY impressed with the quality of the cutting and bending. TOP NOTCH! I am 100% satisfied with the entire process.... from drawing the parts with your software to ordering electronically....   This is truly revolutionary when it comes to custom machined parts! Excellent job!  I've turned on ..."
- DJ Vegh
PCB CAD program

Design printed circuit boards online at our PCB division - Pad2Pad.com

Design services
Visa Mastercard Amex Discover
eMachineShop.com | 31 Industrial Ave. | Mahwah, NJ 07430 | Phone 201-962-7511 | Questions? Contact us.

© 2014 eMachineShop.com | Admin | Site by Paradigm Site Ensemble CMS Copyright © 2014 Paradigm New Media, LLC. All rights reserved.