Replace a damaged or missing tandem roller assembly in your patio sliding glass door with a durable, adjustable steel ball bearing roller assembly designed for smooth, reliable operation. Key benefits - Restores smooth sliding: Concave steel ball bearing roller reduces friction and sticking, improving door glide and reducing noise. - Durable construction: Stamped steel housing protects the roller and resists everyday wear, extending service life. - Easy to adjust and install: Height-adjustable design lets you align the door for proper fit and smooth operation; installation requires only a Phillips head screwdriver. - Compatible with common sliding door applications: Fits a variety of patio sliding glass doors that accept this size and mounting pattern. Important specifications (read carefully for fit) - Wheel thickness (width): 5/16" - Wheel profile: 1-1/4" concave ball bearing steel roller - Housing width: 11/16" - Housing height: 1-13/32" - Housing length: 3-1/8" - Adjustable height; minimum folded height: 1-9/32" - Mounting: 1/4-20 mounting hole on back; optional #10-32 threaded hole on top - Housing material: stamped steel - Roller type: concave steel ball bearing - Tool required: Phillips head screwdriver for installation Why this assembly stands out - Concave ball-bearing roller centers the wheel in the track for stable, consistent movement under load. - Stamped steel housing provides a robust enclosure without adding excessive weight. - Threaded mounting options (1/4-20 and optional #10-32) allow for straightforward replacement of factory fittings or retrofit installations. - Adjustable height lets you correct door alignment issues without replacing the entire door assembly. Performance and compatibility notes - Designed specifically as a replacement tandem roller assembly for patio sliding glass doors. Verify housing dimensions and mounting pattern against your existing assembly before ordering. - Adjustable minimum folded height of 1-9/32" helps achieve the correct door clearance and reduces binding or dragging. - The concave profile wheel improves tracking in standard sliding-door tracks; ideal for doors that have started to stick or make noise. Typical use scenarios - Replace a worn lower tandem roller on a patio sliding glass door to stop scraping and restore smooth opening and closing. - Retrofit an older sliding door where the original roller assembly is missing or damaged, using the 1/4-20 rear mounting hole or the optional #10-32 top threaded hole as needed. - Adjust door height to correct misalignment after seasonal settling or when the door contacts the jamb, using the assembly’s adjustable height feature to fine-tune the fit. Installation tips - Confirm the housing width (11/16"), height (1-13/32"), and length (3-1/8") match your existing assembly before purchase. - Use a Phillips head screwdriver to remove the old assembly and fasten the new one. If the optional #10-32 top hole is used, ensure the mating screw is the correct thread size. - Adjust the roller height incrementally and test the door operation to achieve smooth travel and proper sealing. This steel ball bearing roller assembly provides a practical, reliable solution for restoring the function of patio sliding glass doors with the specified housing and mounting dimensions.