The NSK A139 is a high-quality sheathed V-belt, designed for reliable power transmission in various industrial and agricultural machinery. Featuring an A-section profile, it has a top width of 12.7 mm (1/2 inch) and an inside length of 3530.6 mm (139 inches). Its wrapped construction ensures durability and efficient operation, making it a suitable replacement for standard A139 V-belts from other manufacturers.