The Norton 8501693 is an adjustable surface-mounted door closer featuring a full cover and black finish with sex nuts for secure installation. Engineered with a durable aluminum alloy body and a rack and pinion design, this closer offers separate and independent valves for latch, sweep, and backcheck intensity adjustments. Certified to ANSI/BHMA A156.4 Grade 1 standards, it ensures superior reliability and performance, exceeding 25 million cycles. Non-handed and equipped with staked valves, the closer comes with a limited 25-year warranty, making it ideal for commercial applications requiring precise, long-lasting door control.