The Rhino Square Post Drive Cap protects square anchor posts from mushrooming while a Rhino gas post driver hammers them home. Machined from high-strength alloy steel with a hardened, heat-treated striking surface and a corrosion-resistant coating, each cap seats squarely over the post and spreads impact evenly across the end. Four sizes cover square posts with inside diameters from 1-1/2 in. through 2-1/4 in., selected right on this page.
Sign, fence and anchor crews reach for these caps when setting square anchor systems, signposts and structural supports in construction, agriculture and roadwork. The caps sit with the rest of the Rhino gas series accessories, and the Rhino post driver buyers guide shows which driver and cap combination fits your post. For square-tube work at municipal scale, the Multi-Pro XA Municipality Kit bundles square drive caps with slotted and square chucks.
- Four cap sizes fit square posts with inside diameters of 1-1/2, 1-3/4, 2 and 2-1/4 in.
- High-strength alloy steel body with hardened, heat-treated striking surface for long service life
- Reinforced top absorbs driving force and prevents post mushrooming, splitting and surface damage
- Corrosion-resistant coating stands up to outdoor fence, sign and anchor work
- Compatible with Rhino post drivers for square anchor, signpost and fencing installations
- Applications: fencing, road signage, square anchor systems, construction and agriculture
- Stocked by Crowder Supply in Denver in all four sizes
Square Post Drive Cap FAQ
How do I choose the right cap size?
Size the cap by your post’s inside diameter: options fit 1-1/2, 1-3/4, 2 and 2-1/4 in. ID square posts, with each cap running one step larger than the post it seats over (for example, the 1-3/4 in. cap fits 1-1/2 in. ID posts).
Which post drivers do these caps work with?
They are made for Rhino gas post drivers, including the Multi-Pro, and drop in like any other drive accessory. Browse our full range of post drivers if you’re still choosing a machine.
Do I really need a drive cap for square anchor posts?
Yes, if you want the post to survive driving. The hardened, heat-treated top spreads each blow evenly across the post end, preventing the mushrooming, splitting and surface damage that bare-end driving causes.