Belt drives. Narrow V-belts. Sections 9N/J, 15N/J and 25N/J (lengths in the effective system)

Belt drives. Narrow V-belts. Sections 9N/J, 15N/J and 25N/J (lengths in the effective system)

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1   Scope

This International Standard specifies, for narrow V-belts of cross-sections 9N/J (for pulley grooves of effective width 8,9 mm), 15N/J (for pulley grooves of effective width 15,2 mm) and 25N/J (for pulley grooves of effective width 25,4 mm),
  • — the standard effective lengths,
  • — the tolerances on effective lengths,
  • — the centre distance variations,
  • — the conditions for measuring the effective length and the centre distance variation, and
  • — the designation and marking.

NOTE 1 The cross-section of a narrow V-belt is defined by a number (9, 15 or 25) followed by the letter N or J to denote single or joined belts.

NOTE 2 To define belts of raw-edge cogged construction, the letter “X” is added, i.e. NX or JX.