SPIN FIN™ piles are a cost-saving alternative for many pile foundation applications. This PND proprietary invention consists of a pipe pile equipped with angled plate fins. The SPIN FIN piles rotate into the ground when driven and achieve pile capacities far in excess of conventional piles. Their strength is derived from the pile tips end bearing.

SPIN FIN piles are often used in docks, dolphins, retaining wall tiebacks, wave barriers, seismic anchors, bridge supports, and other pile foundations where anticipated uplift or impact load may cause failure. Because of their load deformation characteristics, these piles allow substantial pile overload deformation without catastrophic failure even after repeated loading.

SPIN FIN piles have been in use since 1983, when PND first developed the technology. Since then, thousands of SPIN FIN piles have been installed in a variety of applications, including:

  • Limited Overburden: Pile tension capacities have been tested in excess of 800 kips with a pile embedment as little as 50 feet.
  • Soft Soils: Pile lengths have been reduced by as much as 50% with the use of SPIN FIN tips in softer soils.

  • Seismic Capacity: SPIN FIN piles exhibit significant reserve strength with cyclic loading that has advantages in seismic events.

  • Energy Absorption: SPIN FIN piles can absorb a huge amount of energy through deflection without loss of strength. This is significant in applications such as breasting dolphins.


  • PND ENGINEERS, INC. Celebrates 40 Years in Business

    Consistently and currently ranked in Engineering News-Record’s annual list of the country’s top 500 design firms, PND Engineers, Inc. prides itself on producing innovative engineering solutions at low costs and oftentimes in the most challenging conditions. That ethos has driven our company’s purpose for 40 years. We were founded in 1979 in Anchorage by the first Alaska Native licensed engineer in the state (Roy Peratrovich, Jr.) and a future Nova Award winner (Dennis Nottingham) and were incorporated with the help of a former University of Notre Dame running back who won an NCAA national championship in 1953 (Paul Reynolds). A few years after Brent Drage became a principal stockholder in 1981, Alaska Construction & Oil gave an emergent PND initialisms “Permanent. No-Nonsense. Dependable.” and “Persistent. Nervy. Determined.” To all of our clients, we couldn’t have earned this longstanding reputation without you. You’ve helped make this company what it is today.

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