Buying Guide
Security Bollard Crash Ratings Explained (K4 / PAS 68)
Updated Nov 2026 · 5 min read
What does "K4" mean?
Crash ratings describe how much kinetic energy a bollard can stop. The K system (ASTM) uses a 6,800 kg (15,000 lb) truck: K4 = stop at 48 km/h (30 mph), K8 = 64 km/h (40 mph), K12 = 80 km/h (50 mph). The European PAS 68 system is similar but uses a 7,500 kg vehicle. Higher number = stronger stop.
Which rating does your site need?
- K4 — government compounds, embassies, data centers, corporate campuses: the most common spec for critical sites.
- K8 / K12 — military, airports, power plants and other highest-risk targets.
- No crash rating needed — parking management and traffic guidance: standard hydraulic bollards are enough and much more economical.
Three buying tips
- Ask for the actual crash-test report, not just the words "K4" on a quote.
- Check the foundation depth — crash performance depends on correct civil works.
- Confirm hydraulic vs pneumatic matches your climate and duty cycle.
Get certified protection
CHANGLONG rising bollards are available with K4 certification and full test reports. Send us your site drawings for a free proposal.