Norton Rixson 1601 Series Aluminum Surface Door Closer Adjustable Spring Size 1-6The Norton Rixson 1601 Series is a heavy-duty, cast aluminum surface door closer built for commercial applications where consistent, code-compliant door control is non-negotiable. Rack-and-pinion hydraulic action, a field-adjustable spring from Size 1 through 6, and Tri-Style packaging regular arm, top jamb, and parallel arm in one box make this the go-to closer for new construction and retrofit projects across office, healthcare, education, and multi-family applications. ANSI/BHMA Grade 1 certified, UL/cUL listed for fire-rated doors, and UL10C positive-pressure fire test compliant.Key SpecificationsBody Construction: Cast aluminum, rack-and-pinion designProjection: 2-7/8" (73mm)Piston Diameter: 1-3/8" (35mm)Pinion Journal Diameter: 5/8" (16mm)Spring Size: Adjustable, Size 16 (field-set)Maximum Door Weight: 250 lbs.Cycle Rating: Exceeds 25 million cyclesDuty Level: Heavy DutyTraffic Rating: Moderate TrafficANSI/BHMA: Grade 1Listings: UL/cUL listed for fire-rated doors; UL10C positive-pressure fire test compliantCover: OptionalWarranty: 30-Year LimitedArm Configurations AvailableThis listing covers the full 1601 arm family. Select your arm type and finish at checkout:Regular Arm (1601 / 1601H): Standard tri-style regular, parallel, or top jamb to 3" reveal; hold-open model availableTop Jamb Arm (J1601 / J1601H): Top jamb mount, reveals 2-3/4" to 7"; hold-open model availableLow Profile Arm (1681): Regular low-profile arm for reduced projectionParallel Low Profile Arm (P1681): Parallel mount, low-profileCushion Stop Arm (CA1601): Non-hold-open cushion stop for wall/door stop protectionParallel Rigid Arm (PR1601 / PR1601H): Parallel rigid arm; hold-open model availableCloserPlus Arm (CLP1601 / CLP1601T): Integrated stop arm; hold-open model availableCloserPlus Spring Arm (CPS1601 / CPS1601T): Spring-loaded CloserPlus arm; hold-open model availableUniTrol Parallel Arm (UNI1601 / UNI1601H): UniTrol parallel arm with built-in stop; hold-open model availableUniTrol Top Jamb Arm (UNIJ1601 / UNIJ1601H): UniTrol top jamb arm; hold-open model availableValve SystemSeparate and independent latch, sweep, and backcheck intensity valves staked design prevents accidental field adjustment. Spring size is set via the adjustment screw on the closer body; no body replacement required when door weight or usage changes.Installation NotesTri-Style packaging supports regular arm, top jamb, and parallel arm mounting from a single unit confirm arm selection before ordering specialty arm variants (J-, CA-, CLP-, CPS-, PR-, UNI-, UNIJ- prefixes).Set spring size after mounting: turn the spring adjustment screw clockwise to increase closing force; start at Size 3 for most commercial interior doors and adjust to achieve positive latching without slamming.Adjust sweep valve first (controls door speed from open to ~10 before latch), then latch valve (final 10 closing speed), then backcheck (resistance when door is pushed hard open past ~70).For fire-rated openings: verify UL listing applies to the specific door/frame assembly; do not use hold-open models on fire-rated doors without an approved release device.Refer to the installation instruction PDFs below for template dimensions, torque specs, and arm-specific mounting sequences.Typical ApplicationsCommercial office and retail: Grade 1 durability handles high-frequency interior corridor and suite entry doors without premature wear.Healthcare and education: UL10C positive-pressure compliance satisfies fire-door requirements on rated corridor openings; 250 lb capacity covers heavy solid-core doors.Multi-family and hospitality: 30-year warranty and 25M+ cycle rating reduce replacement frequency across large door counts.Retrofit and renovation: Adjustable spring Size 16 and multiple arm options allow a single closer model to cover a wide range of door sizes and mounting conditions on the same project.