kevlar or rubber deck belt?

Wrenchit

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"L" in V belts stands for Light duty. Measurements will be the same.
Others are listed here:
  • La: Outer (circumference) length1
  • Le: Effective length2
  • Ld: Datum length3
  • Lp: Pitch length3, 4
  • Lw: Working length3
  • Certain conditions:

    1 No belt stretch / tension applied

    2 Length relative to the effective outside diameter of a sheave with belt stretch / tension applied

    3 Length at the pitch diameter of the sheaves used with belt stretch / tension applied

    4 Technically defined as “any circumferential line which keeps the same length when the belt is bent perpendicularly to its base” (ISO 1081:2013)
    Li: Inner (circumference) length1
 
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