Synchrobelt MXL-XXH

This standard timing belt has been developed so as to perfect the product range for our customers. It is considered to be a particularly cost-effective way of transmitting force when using a timing belt.

Advantages

The belt is on offer in a variety of tooth shapes (MXL-XXH / HTD / STD) and lends itself for use in the lower and medium power range.

1. Partially oil resistant
2. These belts can be operated within a temperature range of -20°C up to +100°C
3. They are suitable for tropical conditions, are ageing resistant and also ozone resistant
4. Such belts can be used with inner and outer idler pulleys
5. Maintenance-free

MXL XL L H DH XH XXH
Tooth pitch t (mm) 2.032 5.080 9.525 12.700 12.700 22.225 31.750
Belt thickness hs(mm) 1.140 2.300 3.600 4.300 6.000 11.200 15.800
Tooth height h(mm) 0.510 1.270 1.910 2.290 2.290 6.350 9.600
Belt type MXL
Tooth distance 2,032 (mm)
Width code 012 / 019 / 025
Width in mm 3,05 / 4,83 / 6,35
Size 43,2 MXL 77,6 MXL 132,8 MXL
44 MXL 80 MXL 136 MXL
44,8 MXL 80,8 MXL 140 MXL
46,4 MXL 82,4 MXL 144 MXL
48 MXL 84 MXL 147,2 MXL
48,8 MXL 84,8 MXL 180 MXL
50,4 MXL 88 MXL 188,8 MXL
54,4 MXL 89,6 MXL 200,8 MXL
56 MXL 90,4 MXL 238,4 MXL
56,8 MXL 91,2 MXL 277,6 MXL
57,6 MXL 94,4 MXL 292 MXL
60 MXL 96 MXL 296,8 MXL
61,6 MXL 97,6 MXL 297,6 MXL
64 MXL 98,4 MXL 320 MXL
65,6 MXL 100 MXL 329,6 MXL
67,2 MXL 100,8 MXL 347,2 MXL
68 MXL 105,6 MXL 362,4 MXL
69,6 MXL 112 MXL 370,4 MXL
70,4 MXL 120 MXL 398,4 MXL
72 MXL 124 MXL 404 MXL
75,2 MXL 131,2 MXL
76 MXL 132 MXL
Calculation formula Teeth no. = Length code
Calculation of the belt pitch length in mm
Teeth no. x tooth distance (2,032 mm)
Example: 44MXL: 44x2,032 = 89,40 mm
Belt type XL
Tooth distance 5,08 (mm)
Width code 025 / 031 / 037
Width in mm 6,4 / 7,9 / 9,5
Size 60 XL 150 XL 272 XL
70 XL 156 XL 274 XL
76 XL 160 XL 280 XL
80 XL 162 XL 286 XL
86 XL 166 XL 290 XL
90 XL 168 XL 296 XL
92 XL 170 XL 300 XL
94 XL 174 XL 306 XL
96 XL 176 XL 316 XL
100 XL 178 XL 322 XL
102 XL 180 XL 330 XL
106 XL 182 XL 340 XL
108 XL 184 XL 344 XL
110 XL 188 XL 350 XL
112 XL 190 XL 380 XL
114 XL 196 XL 382 XL
116 XL 198 XL 388 XL
118 XL 200 XL 392 XL
120 XL 210 XL 412 XL
124 XL 220 XL 414 XL
126 XL 230 XL 438 XL
128 XL 232 XL 460 XL
130 XL 240 XL 498 XL
134 XL 244 XL 506 XL
136 XL 248 XL 514 XL
138 XL 250 XL 580 XL
140 XL 260 XL 630 XL
148 XL 270 XL
Calculation formula Teeth no. = Length code/2
Calculation of the belt pitch length in mm
(Zahl der Zähne/2) x Zahnabstand (5,08 mm)
Example: 60XL: (60/2)x5,08 = 152,40 mm
Belt type L
Tooth distance 9,525 (mm)
Width code 050 / 075 / 100
Width in mm 12,7 / 19,1 / 25,4
Size 124 L 255 L 420 L
150 L 270 L 450 L
187 L 285 L 454 L
210 L 300 L 480 L
225 L 322 L 510 L
236 L 345 L 540 L
240 L 367 L 600 L
244 L 390 L
Calculation formula Teeth no. = Length code/3,75 (auf volle Zähne runden)
Calculation of the belt pitch length in mm
(Zahl der Zähne/3,75 gerundet) x Zahnabstand (9,525 mm)
Example: 124L: (124/3,75) = 33 Zähne
33x9,525= 314,95 mm
Belt type H  
Tooth distance 12,7 (mm)  
Width code 075 / 100 / 150 / 200 /300  
Width in mm 19,1 / 25,4 / 38,1 /50,8 /76,2  
Size 240 H 450 (D)H 750 (D)H
255 H 480 (D)H 800 H
270 (D)H 510 (D)H 850 H
300 (D)H 540 (D)H 900 H
330 (D)H 570 (D)H 1000 H
335 (D)H 600 (D)H 1100 H
360 (D)H 630 (D)H 1140 H
370 (D)H 660 (D)H 1250 H
390 (D)H 700 (D)H 1400 H
420 (D)H 730 (D)H 1700 H
Calculation formula Teeth no. = Length code/5  
Calculation of the belt pitch length in mm  
Zahl der Zähne/5 x Zahnabstand (12,7 mm)  
Example: 225H: (225/5)x12,7 = 571,5 mm  
Belt type XH
Tooth distance 22,225 mm
Width code 200 / 300 / 400 /500
Width in mm 50,8 / 76,2 / 101,6 /127
Size 507 XH
534 XH
560 XH
630 XH
700 XH
770 XH
840 XH
980 XH
1120 XH
1260 XH
1400 XH
1540 XH
1750 XH
Calculation formula Teeth no. = Length code/8,74
 (auf volle Zähne runden)
Calculation of the belt pitch length in mm
(Zahl der Zähne/8,74 gerundet) x Zahnabstand (22,225 mm)
Example: 507XH: (507/8,74) = 58 Zähne
58x22,225= 1.289,25 mm
Belt type XXH
Tooth distance 31,75 mm
Width code 200 / 300 / 400 /500
Width in mm 50,8 / 76,2 / 101,6 /127
Size 700 XXH
800 XXH
900 XXH
1000 XXH
1200 XXH
1400 XXH
1600 XXH
1800 XXH
Calculation formula Teeth no. = Length code/12,5
Calculation of the belt pitch length in mm
(Zahl der Zähne/12,5) x Zahnabstand (31,75 mm)
Example: 700XXH: (700/12,5)x31,75 = 1.778 mm

Alongside our wide standard range of this product, we also craft in our ateliers high-precision drawing parts and customised special pulley washers for MXL, XL, L, H, XH and XXH pitches. With all our products we offer a comprehensive service ranging from the manufacturing of mechanical processing parts and gearing components right up to the mounting of finished systems and assembly units.

In order to achieve optimal performance and as long a service life as possible, timing belts have to be correctly installed, correctly tightened and correctly aligned. Prior to installation, it is always recommendable to inspect the belts for any possible damage resulting from transport or storage.

The Correct Mounting

Pulleys and, of course, belts themselves always have to be mounted with the correct alignment. This means that belts cannot be bent or buckled in any way, which could lead to a drop below the minimum permissible pulley diameter. That corresponds to approximately 50 mm for belts with a pitch of 8 mm and about 125 mm for those belts with a 14 mm pitch. Imbalanced drives cause a variety of belt tension problems and edge stresses and are also responsible for extreme lateral movement, the undesired wobble. All this leads to increased operating noise and more wear and tear on the belt. Therefore the parallelism error of the pulleys should only amount to a maximum of 0.5% of the centre distance. Angle accuracy is to be maintained by keeping misalignment down to 0.25° at the very most.

Pre-Tensioning The Belt Correctly

Firstly the belt always has to be tightened in line with the calculated pre-tensioning force and checked after a running-in period of about 5 minutes. The belt is then to be retightened according to the relevant value, should it have shifted or altered its position in any way. Finally after a further 8 hours of operating, the belt is to be once again inspected and, if necessary, tightened to comply with the required value that has already been calculated.

Causes of failure and corrective measures can be found in the following document:

Troubleshooting for power transmission products

Belt length
mm
Minimal
adjustment
for installation
Required
adjustment range
for tightening
8M 14M 8M, 14M
smaller than 1525 34,5 mm 59,5 mm 2,5 mm
1525 - 3050 37,0 mm 62,0 mm 5,0 mm
greater than 3050 39,5 mm 64,5 mm 7,5 mm