Corbin Russwin 689F01 Heavy-Duty Parallel Arm Closer Replacement Part with Backstop for DC3000 and DC6000 SeriesCommercial-Grade Parallel Arm Assembly for DC3000 and DC6000 Series Door ClosersThe Corbin Russwin 689F01 is a heavy-duty backstop parallel arm (A4) replacement part engineered for compatibility with Corbin Russwin DC3000 and DC6000 Series door closers. Designed for pull-side mounting in commercial applications, this closer complete arm features a field-reversible steel lug that restricts the degree of opening to protect the door, wall, and surrounding hardware. Supporting door opening sizes from 85 to 110 degrees, this tamper-resistant parallel arm assembly delivers reliable, long-term performance in demanding commercial environments.Professional Features & BenefitsCast aluminum body with Cam-Motion technology for easy opening and secure closingAdjustable spring size 1 through 6 accommodates door weight up to 250 lbs.Non-handed single model supports up to four mounting positionsUnique spline arm with multiple indexing options for standard and special applicationsPush and pull side installation, door or frame mountedForward-facing adjustable closing and latching speed valvesBackcheck standard on all unitsHold open available: specify DC5200 x A11/2" vertical adjustment for flexible installationANSI/BHMA A156.4 Grade 1 certified; ADA compliant; TAA compliantUL10C positive pressure up to 3 hours; UL-cUL listed30-year limited warrantyTechnical SpecificationsGrade: ANSI/BHMA A156.4, Grade 1Body: Cast aluminum, cam and roller designSpring Power: Adjustable sizes 1 through 6Door Weight: Up to 250 lbs.Door Thickness: 1-3/4" (44mm) standardOpening Range: Pull side: 140; push side: 110Maximum Interior Door Width (Recommended): 54" (137mm)Valves: Independent adjustable closing speed and latching speed; standard backcheckHold Open: Available (specify A1 arm); not for fire doorsMounting: Pull side door or frame mounted; push side door or frame mountedCertifications: ANSI/BHMA A156.4 Grade 1; ADA/ANSI A117.1; UL10C (3 hr.); UL-cUL; TAAWarranty: 30-year limitedProfessional ApplicationsCommercial Office BuildingsEducational FacilitiesHealthcare InstitutionsRetail EstablishmentsIndustrial and Warehouse FacilitiesMulti-Tenant Residential PropertiesGovernment and Municipal BuildingsTamper-Resistant DesignThe Corbin Russwin 689F01 features tamper-resistant construction that deters unauthorized adjustment or tampering with the arm assembly. This design helps maintain consistent door closer performance and protects the integrity of the installation in high-traffic or public-access commercial environments.Why Choose Corbin Russwin Quality?Corbin Russwin door closer parts are manufactured to commercial-grade standards, delivering reliable performance and precise compatibility with the DC3000 and DC6000 Series closer platforms. The 689F01 parallel arm assembly is backed by a 30 Year Limited warranty, reflecting the brand's commitment to long-term durability and dependability. Engineered for demanding commercial applications, this replacement part ensures your door control system continues to operate safely and effectively.