The Danuser SM40 is a hydraulic hammer post driver with a 40-inch stroke, 300-pound standard hammer, universal skid-steer quick-attach plate, and 96-inch hoses. The free-fall hammer delivers consistent strikes for fence posts, guardrail, median dividers, tent stakes, T-posts, pipe fence, and railroad ties. Its 40-inch stroke and 300-pound hammer are designed for production post-driving work.Key Features40″ Free-Fall Hammer StrokeThe SM40 can achieve full-stroke impact on every cycle or use short-stroke mode for precise depth control. No return springs or rebound cylinders to wear out.300 lb Hammer, 500 lb with Weight KitA standard 300 lb hammer delivers up to 1,025 ft‑lbs of energy. Add the optional 200 lb weight kit to reach 500 lb and boost impact energy to 1,709 ft‑lbs. Ground-driven force reaches 82,000 lb when fully weighted.Hydraulic Tilt (±20°) OptionAn optional tilt attachment enables 20° of side-to-side angle, allowing straight post setting even on slopes and uneven terrain.Optional Hydraulic GrappleAdd an optional hydraulic grapple to perform one-person post installation, from picking up the post to fully driving it, without leaving the cab.Universal Quick-Attach MountCompatible with all major skid steers and compact loader brands. Requires a hydraulic circuit supplying 12–30 GPM at 1,500–3,000 PSI.Heavy-Duty ConstructionThe hammer housing and mount steel are 3/4″-thick and built to withstand repeated heavy cyclic loads. Greasable pivot points and hoses employ industrial-grade fittings for durability.Technical Specifications Feature Specification Hammer Stroke 40″ full drop Hammer Weight 300 lb standard, 500 lb max with kit Strokes per Minute Up to 35 Impact Energy 1,025 ft‑lbs (300 lb), 1,709 ft‑lbs (500 lb) Clamping/Impact Force 82,000 lb at 500 lb weight Tilt Range (optional) ±20° Hydraulic Flow 12–30 GPM @ 1,500–3,000 PSI Max Post Width 8.5″ × 9.25″ Machine Weight 915 lb base, 1,115 lb with weight kit Overall Dimensions 45.5″ L × 25″ W × 64″ H Mount Style Universal Skid-Steer Quick-Attach PerformanceThe SM40 delivers full-energy hammer drops at rates reaching 35 impacts per minute with full hydraulic flow, efficiently driving posts through rock and hard-packed soils. Short-stroke mode enables careful depth control around utilities or in sensitive areas. The optional grapple and tilt support post positioning and one-person operation, even on sloped work zones.Related Equipment post drivers Danuser attachments
