Timing Belts & Pulleys

The three principal dimensions of Timing Belts are pitch length, pitch of the teeth and width for ordering code

XH Pitch 7/8
std width	code
2"	200
3"	300
4"	400

HIGH TORQUE BELTS
Ordering code: Pitch length in mm - Pitch in mm -width in mm
Example : 1778 - 14 M-85
Pitch length 1778 mm, Pitch 14 mm, Belt width 85 mm

3 M
Standard Width
6mm, 9mm & 15mm

5M
Standard Width
9mm, 15mm & 25mm

8 M
Standard Width
20mm, 30mm, 50mm & 85mm

14M
Standard Width
40mm, 55mm, 85mm, 115mm & 170mm

TIMING BELTS SIZES

'XL' Pitch 1/5"
std width	code
1/4"	025
5/16 "	031
3/8 "	37

'L' Pitch 3/8"
std width	code
1/2"	050
3/4"	075
1"	100

'H' Pitch 1/2"
std width	code
3/4"	075
1"	100
1 1/2"	150
2"	200
3"	300

LIGHT PITCH PULLEY

(L) Pitch = 3/8" - L050/L075/L100

'H' Pitch = 1/2" - H100/H150/H200/H300

Belt width = H100 - 3/4" & 1", H150 - 1 1/2", H200 - 2", H300 - 3"

HEAVY (H) PITCH PULLEY

14M

The number of flanges is given as either 0, 1 or 2. Should a pulley with hub, have only one flange, then it should be designated as follows: Flange on hub side (diagram left) - 1a Flange on the side opposite to the hub (diagram right) - 1g

Example : Pulley with hub for 10 mm belt width
	Pulley
Material Steel Pulley width BN Pitch Number of teeth Number of flanges Hub diameter dN Hub length BN -B Bore d or rough bore dv	St 23 T5/ 33 -2 Hub 035 8 dv

Example : Pulley without hub for 10mm belt width
	Pulley
Material Steel Pulley width BN Pitch Number of teeth Number of flanges Bore d D IN 6885 groove	A1 15 T5/ 33 -0, d=12 with groove

PULLEY SELECTION SUGGESTIONS

• Pulley diameter should not be smaller than the belt's width.
• If centre distance is more than 8 times the diameter of smaller pulley, both the pulleys should be flanged.
• Never crimp fibre glass cord belts. Crimping will cause damage to fibres, resulting in premature belt failure.

Timing Belts & Pulleys

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