Contact Us About Ameristar Products by Type Products by Crash Ratings Resources SEARCH M50 & K12 M40 & K8 M30 & K4 PAS 68 Products by Crash Ratings Our anti-ram products are crash certified to the ASTM M-ratings which have replaced K-ratings. Both M-ratings and K-ratings use a 15,000 lb. vehicle for testing. The primary difference is that M-ratings are certified based on how far the payload travels past the barrier, while K-ratings are based on how far the front bumper travels past the barrier. Because of their similarities, we can offer equivalent M and K ratings. If a rating is engineered, it means that the product is certified by the ASTM based on an engineered configuration and computer model testing. We also offer products that are certified to interational standards like PAS 68 and IWA 14. Read our guide for more information on crash ratings and what they mean. M50 & K12 M30 & K4 M40 & K8 PAS68 & IWA14 Share This Page! Facebook Twitter LinkedIn E-mail Print © Ameristar Perimeter Security, 2018 Customer Login | Legal & Privacy Notice | Careers | About Us | Site Map | Link to Us An ASSA ABLOY Group Brand Experience a safer and more open world By clicking “Accept All Cookies”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. Read more about our use of cookies Reject Cookies Accept All Cookies Cookies Settings