Crash Ratings Explained: K4, K8, K12, M30, M50 for Bollards

Crash ratings tell you exactly what a bollard can stop. A bollard without a crash rating is just a metal post—its stopping power is unknown and unverified. For any security application where lives are at stake, the crash rating is the single most important specification.

There are four major crash test standards you will encounter:

• **ASTM F2656 (USA)**: Uses M30, M40, M50 ratings. M50 means the bollard stops a 6,800kg truck at 80km/h. M30 stops the same truck at 48km/h.

• **DOS K-Rating (USA)**: K4 = 30mph, K8 = 40mph, K12 = 50mph. K12 is the highest, stopping a 6,800kg vehicle at 80km/h.

• **PAS 68 (UK)**: Similar to ASTM, uses vehicle weight and speed notation like 7500/48.

• **IWA 14-1 (International)**: The newest standard, harmonizing PAS 68 and ASTM approaches.

UPARK offers bollards with K12/L3 crash certification (ASTM F2656-20), meaning they have been independently tested to stop a 6,800kg vehicle traveling at 80km/h with less than 1 meter of penetration. This is the highest practical rating for most security applications.

When a manufacturer claims a crash rating, ask for the test report. A real crash test includes high-speed video, penetration measurements, and post-impact condition photographs. If the manufacturer cannot provide this documentation, the rating is a marketing claim, not a certified performance guarantee.