Naming Conventions for Mechanical Synchronous Pulleys – Examples and Comparisons

Mechanical synchronous pulleys are typically named according to international standards (such as ISO, RMA, DIN) or manufacturer-specific conventions. Different standards and brands may use varying naming schemes. Below are common naming methods with comparative examples.

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1. By Tooth Profile Standard

(1) Metric Trapezoidal Tooth (ISO 5296)

• Naming Rule: Model + Tooth Count + Additional Features
  • Model: T2.5, T5, T10 (number indicates pitch in mm)
  • Examples:
    • T5-30: Trapezoidal tooth, 5mm pitch, 30 teeth.
    • T10-50-F: Trapezoidal tooth, 10mm pitch, 50 teeth, with flange (F).

(2) Curvilinear Tooth (HTD/STS/GT, etc.)

• HTD (High Torque Drive):
  • Naming Rule: HTD + Pitch + Tooth Count
  • Example: HTD 8M-40 (8mm pitch, 40 teeth).
• GT (Gates GT Series):
  • Example: GT3-24 (3mm pitch, 24 teeth).

(3) Imperial Curvilinear Tooth (MXL/XL/L/H/XH, etc.)

• Imperial Standard (common in low-power transmissions):
  • MXL (finest), XL, L, H, XH (from fine to coarse).
  • Example: L-075 (L-type tooth, 75 teeth).

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2. By Pulley Structure

(1) Simple Type (No Flange)

• Example: S3M-18 (S = simple, 3M tooth profile, 18 teeth).

(2) Flanged Type (Anti-Dislodgment)

• Example: T5-25-F (F = flange).

(3) Double-Sided Pulley (Two Sets of Teeth)

• Example: XL-50D (D = double-sided, 50 teeth).

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3. Manufacturer-Specific Naming

(1) Gates

• Example: 555-8M-30 (555 series, 8mm pitch, 30 teeth).

(2) Mitsumi

• Example: MTS3MR-20 (MTS series, 3M tooth profile, R = material, 20 teeth).

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4. Comparison Examples

Standard/Brand	Example Model	Interpretation
ISO Trapezoidal	T10-40-F	Trapezoidal tooth, 10mm pitch, 40 teeth, with flange.
HTD Curvilinear	HTD 5M-25	HTD profile, 5mm pitch, 25 teeth.
Gates GT	GT2-16	GT2 profile, 2mm pitch, 16 teeth.
Imperial XL	XL-100	XL profile, 100 teeth (pitch = 5.08mm).
Double-Sided	L-60D	L profile, 60 teeth, double-sided.

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Key Differences

1. Pitch Unit: Metric (mm) vs. Imperial (inch).
2. Tooth Profile ID: Trapezoidal (T), Curvilinear (HTD/GT), Imperial (XL/L/H).
3. Additional Features: Flange (F), Double-sided (D), Material (e.g., R = nylon).

For accurate identification, always refer to equipment manuals or supplier specifications, as compatibility depends on tooth profile parameters (pitch, tooth height, etc.).