The Truth Hardware (AmesburyTruth) 39.10 is a side adjust tandem patio door roller with a zinc plated steel housing and two 1-1/4" (31.8 mm) steel wheels. A pair of these rollers carries a sliding patio door panel weighing up to 400 lb (182 kg), riding on Truth's own full-race ball bearings — machined from solid steel bar stock, heat treated, permanently lubricated, and labyrinth-shielded against dust and moisture. Height adjusts from both sides of the door for easy levelling after installation. Often called a sliding door roller, patio door wheel, or tandem roller assembly.

Note: if your door runs on an aluminum track, Truth specifies a nylon-wheel roller instead (such as the 39.11) — a steel wheel on an aluminum track causes galling and shortens track life.

Specifications

• Part number: 39.10
• Series: Truth 39 Series side adjust tandem rollers
• Handing: Non-handed (adjustable from both sides)
• Finish: Zinc plated (all steel parts, ASTM B-633 Type 2)
• Housing & carrier: Cold-rolled steel
• Wheels: Two 1-1/4" (31.8 mm) steel wheels with permanently lubricated ball bearings
• Wheel groove radius: .125" (3.2 mm)
• Gear mechanism: High-pressure die-cast zinc
• Case: 4.65" (118.1 mm) long, 1.116" (28.3 mm) tall, .718" (18.2 mm) wide
• Mounting holes: 5-3/4" (146.1 mm) on centre
• Mounting tabs: Standard
• Mounting: Recess mounted; the door profile must provide side and top support
• Height adjustment travel: Approx. 5/16" (7.9 mm)
• Max door weight: 400 lb (182 kg) with two roller assemblies per door
• Screws: Two #8 Phillips flat head screws per roller (sold separately)
• Standards: Designed to meet AAMA 906.3-96 and CAWM corrosion, load, and life-cycle specs

Sometimes (but not always) marked "31761" on the roller assembly.