The Rhino 4 in. x 6 in. H Column Driving Cap is a dedicated drive cap for the Rhino PD-140 post driver, built for setting the H-column steel sections used in highway and roadside barrier installations. Its 4-1/4 in. x 6-1/4 in. profile seats squarely over the H-column flange and transfers full impact force evenly across the post head for straight, damage-free drives on heavy structural steel.

The cap must be paired with the PD-140s matching 4 in. x 6 in. H Column Guardrail Chuck Adapter stocked with the rest of our Rhino PD chucks and adapters. Crews starting from scratch can order the PD-140G 4 x 6 Guard Rail Kit instead, which bundles the driver and guardrail tooling; the complete air-driver line is compared on the Rhino pneumatic post drivers page.

• Engineered specifically for 4 in. x 6 in. H-column guardrail posts on the PD-140 system
• 4-1/4 in. x 6-1/4 in. drive profile seats flush over the H-column flange, keeping the post centered and aligned through the drive cycle
• Transfers impact force evenly across the post head, preventing flange distortion on heavy structural steel sections
• Requires the matching 4 in. x 6 in. H Column Guardrail Chuck Adapter
• Built for production guardrail crews driving high cycles per day in highway, DOT and municipal right-of-way work
• Stocked by Crowder Supply in Denver with the full PD series accessory range