Balance methods: (Min. requirements shown below. Other requirements may apply if specified by purchaser.)
Method 1 = component balance (9.3.5) - standard for couplings operating at 1800 rpm or less.
Method 2 = component balance (9.3.5) and assembly check balance (9.3.6) - standard for couplings operating above 1800 rpm
Method 3 = component balance (9.3.5) and assembly balance (9.3.7) - optional for couplings operating above 1800 rpm.