Pulley Type

GT2 Smooth Idler Pulley (Toothless Idler / Passive Pulley)

Tooth Profile

Smooth/No teeth (Designed for guiding the belt or providing tension; does not engage belt teeth)

Compatible Belt Pitch

2mm (refers to the compatible GT2 belt's tooth pitch)

Equivalent Teeth

20 Teeth (This is a common way to classify its size, indicating it has a similar outer diameter to a 20-tooth GT2 geared pulley. It does not have actual teeth.)

Belt Width Compatibility

Primarily designed for 6mm wide GT2 timing belts.

Bore Diameter

3mm (inner diameter, for mounting on a 3mm diameter shaft or bolt)

Outer Diameter (OD)

Approximately 17.5mm - 18mm (This can vary slightly by manufacturer, but it corresponds to a 20-tooth GT2 pulley's OD).

Overall Height/Length

Approximately 8.5mm - 13mm (can vary, especially if it includes a wider flange or thicker bearing)

Material

High-Quality Aluminum Alloy (common for durability, smooth surface, and lightness)

Flanges

Dual flanges (to keep the belt properly aligned and prevent it from slipping off during operation)

Bearings

Typically includes 1 or 2 miniature precision ball bearings (e.g., 693ZZ or similar for 3mm bore) for very smooth, low-friction rotation.

Shaft Fixing

Designed to rotate freely on a shaft or bolt. It typically slips onto the shaft/bolt, and its free rotation is facilitated by the internal bearings. It usually does not have grub screws as it's not meant to transmit rotational power from the shaft.

Precision

High precision bearings ensure smooth, quiet operation, and minimal friction. This is essential for maintaining consistent belt tension and accurate belt guidance, which directly impacts the quality of motion.

Weight

Lightweight, typically 5g - 10g

Color

Silver (standard for aluminum pulleys; some may be anodized black)