Denne standard indeholder specifikationer for hovedformen for k?rvskruer med unders?nkhoved, og den anbefaler et kontrolv?rkt?j til kontrol af hoveddimensioner, fastlagt i de respektive produktstandarder.
1991DS/EN 27 574-3:1991 Acoustics - Statistical methods for determining and verifying stated noise emission values of machinery and equipment - Part 3: Simple (transition) method for stated values for batches of machines