US Sander will be closing at 12pm on Tuesday, December 24th and will be closed Wednesday, December 25th for Christmas. We will also be closing at 12pm on Tuesday, December 31st and will be closed Wednesday, January 1st for New Years.

You can still place orders during this time on our website, but nothing will ship until we re-open on Thursday.

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Drive Belt Size Chart

Belts are measured by the outer circle (see image below). See the charts below for the belt dimensions.

For a list of which belts fit each machine, see the Machine Belt List.

Outer Circle

3L, 4L & 5L Series Belts

L Series Belts
Number Outer Circle Number Outer Circle Number Outer Circle
3L180 18" 4L250 25" 5L250 25"
3L190 19" 4L260 26" 5L260 26"
3L200 20" 4L270 27" 5L270 27"
3L210 21" 4L280 28" 5L280 28"
3L220 22" 4L290 29" 5L290 29"
3L230 23" 4L300 30" 5L300 30"
3L240 24" 4L310 31" 5L310 31"
3L250 25" 4L320 32" 5L320 32"
3L260 26" 4L330 33" 5L330 33"
3L270 27" 4L340 34" 5L340 34"
3L280 28" 4L350 35" 5L350 35"
3L290 29" 4L360 36" 5L360 36"
3L300 30" 4L370 37" 5L370 37"
3L310 31" 4L380 38" 5L380 38"
3L320 32" 4L390 39" 5L390 39"
3L330 33" 4L400 40" 5L400 40"
3L340 34" 4L410 41" 5L410 41"
3L350 35" 4L420 42" 5L420 42"
3L360 36" 4L430 43" 5L430 43"
3L370 37" 4L440 44" 5L440 44"
3L380 38" 4L450 45" 5L450 45"
3L390 39" 4L460 46" 5L460 46"
3L400 40" 4L470 47" 5L470 47"

A, AX, B & BX Series Belts

The only difference between B and BX belts is the BX is cogged to make it more flexible.

B & BX Series Belts
Number Outer Circle Number Outer Circle
A32 & AX32
 34"
 B39 & BX39
 42"
B32 & BX32 35" B40 & BX40 43"
B33 & BX33 36" B41 & BX41 44"
B34 & BX34 37" B42 & BX42 45"
B35 & BX35 38" B43 & BX43 46"
B36 & BX36 39" B44 & BX44 47"
B37 & BX37 40" B45 & BX45 48"
B38 & BX38 41" B46 & BX46 49"

3VX Series Belts

3VX Series Belts
Number Outer Circle Number Outer Circle
3VX250
 25"
 3VX385
 38.5"
3VX265 26.5" 3VX395 39.5"
3VX300 30" 3VX400 40"
3VX315 31.5" 3VX410 41"
3VX355 35.5" 3VX425 42.5"
3VX375 37.5" 3VX475 47.5"

Poly V Type Belts

Poly V belts are measured by the diameter and the number of ribs. The number of ribs is the number after the letter J.
For example, a PV390J8 has 8 ribs. The size dimension is the same for all widths.

Poly V Type Belts
Ribs Width
4 .368"
5 .460"
6 .552"
7 .644"
8 .736"
10 .920"
Number Outer Circle Number Outer Circle
PV240J 24.5" PV360J 36.5"
PV250J 25.5" PV370J 37.5"
PV260J 26.5" PV380J 38.5"
PV270J 27.5" PV390J 39.5"
PV280J 28.5" PV400J 40.5"
PV290J 29.5" PV410J 41.5"
PV300J 30.5" PV420J 42.5"
PV310J 31.5" PV430J 43.5"
PV320J 32.5" PV440J 44.5"
PV330J 33.5" PV450J 45.5"
PV340J 34.5" PV460J 46.5"
PV350J 35.5" PV470J 47.5"