Single V-Belts
Classical
Cross SectionWT
A, AX, AK1/2"5/16"
B, BX, BK21/32"13/32"
C, CX, CK7/8"17/32"
D1 1/4"3/4"
Classical belts constructed from pre-stretched polyester cord (A, B, C, D). "X" designates molded cogged construction (AX, BX, CX). "K" designates Thunder Classical V-Belts®, heavy-duty belts constructed from aramid tensile cord (AK, BK, CK). For belt part number, use Inside Circumference (IC). To calculate IC, measure Outside Circumference (OC) and subtract the following values: A- subtract 2", B- subtract 3", C- subtract 4", D- subtract 5". For part number on belt over 210" measure OC and subtract the following values: B- subtract 1.5", C- subtract 2", D- subtract 2.5". Example: A30= 1/2" wide; 30" IC (32" OC)
Wedge
Cross SectionWT
3V, 3VX, 3VK3/8"21/64"
5V, 5VX, 5VK5/8"35/32"
8V, 8VX, 8VK1"7/8"
Wedge belts constructed from pre-stretched polyester cord (3V, 5V, 8V). "X" designates molded cogged construction (3VX, 5VX). "K" designates Thunder Wedge V-Belts®, heavy-duty belts constructed from aramid tensile cord (3VK, 5VK, 8VK). For belt part number, use OC measurement to the tenth of an inch. Example: 3V425= 3/8" wide; 42.5" OC
Metric
Cross SectionWT
SPZ, SPZX, XPZ10mm8mm
SPA, SPAX, XPA13mm10mm
SPB, SPBX, XPB16mm13mm
SPC, SPCX, XPC22mm18mm
Metric belts constructed from pre-stretched polyester cord (SPZ, SPA, SPB, SPC). "X" designates molded cogged construction (SPZX or XPZ, SPAX or XPA, SPBX or XPB, SPCX or XPC). For belt part number, use OC and subtract the following values: Z- subtract 13mm, A- subtract 18mm, B- subtract 22mm, D- subtract 30mm. Example: SPA1600= 13mm wide; 1618mm OC
FHP
Cross SectionWT
3L3/8"7/32"
4L1/2"5/16"
5L21/32"3/8"
Fractional Horsepower (FHP) belts constructed from pre-stretched polyester cord (3L, 4L, 5L). For belt part number, use OC measurement to the tenth of an inch. Example: 4L400= 1/2" wide; 40.0" OC
Banded V-Belts
Classical
Classical V-Belts bound together with a fabric tie band. For belt part number, indicate the number of ribs and Classical V-Belt part number. Example: 4/C225= 4 rib C225
Wedge
Wedge or Thunder Wedge V-Belts bound together with a fabric tie band. For belt part number, indicate number of ribs and Wedge V-Belt part number. Example: 4/8V3150= 4 rib 8V3150
Double Sided V-Belts
Double Sided
Cross SectionWT
AA1/2"13/32"
BB/td>21/32"17/32"
CC7/8"11/16"
Double Sided V-Belts, known as hexagonal belts, are constructed from pre-stretched polyester cord (AA, BB, CC). For belt part number, use OC and subtract the following values: AA- subtract 3.3", BB- subtract 4.7", CC- subtract 6.2". Example: AA55= 1/2" wide; 58.3" OC
V-Ribbed Belts
V-Ribbed
Three parts make up a V-Ribbed Belt part number: OC measurement to the tenth of an inch, belt cross section letter, and number of ribs. Example: 360J6= 36.0" OC; J-section; 6 ribs wide