• All internal parts , except those actually in rubbing contact, ...
• Rubbing components ( or Friction parts ).
• All internal parts , except those actually in rubbing contact, ...
• Rubbing components ( or Friction parts ).
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012