The 5146 adapter provides a standard 3½"-8 external thread for mounting various bases or other adapters, including standard surveying or optical alignment instruments. It has three mounting holes for fastening the ring to virtually any flat surface. Attention: This design was revised in 2022 to ensure the safety of the tracker. Please verify that your mating parts match the following mounting specifications: #10 or M4 Socket Head Cap Screws 3x Holes arranged equally on a 2.85” (72.4mm) Bolt Circle. You may also be interested in similar products such as the 235-6 (will accommodate an 800 precision lift) or the 235-18. May Be Used With Fits onto any customer-supplied surface with a matching bolt-hole pattern Accepts any product having an internal 3½"-8 thread
