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How to decipher ISO Angle tolerances

Working on a part here with an ISO 2768 standard. How do I interpret the angle tolerances? ±0º20′ Not sure how to decipher this. Any help would be appreciated. Thanks.
Parents
  • That's not really an ISO thing. It's just another kind of notation of an angle. Each degree ( ° ) can be divided into 60 angle minutes or arc minutes ( ' ), and every arc minute can be divided into 60 arc seconds ( " ). So, 0 degrees and 20 arc minutes are 20/60 (twenty times one sixtieth) degrees, which comes to 0.3333... decimal degrees.
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  • That's not really an ISO thing. It's just another kind of notation of an angle. Each degree ( ° ) can be divided into 60 angle minutes or arc minutes ( ' ), and every arc minute can be divided into 60 arc seconds ( " ). So, 0 degrees and 20 arc minutes are 20/60 (twenty times one sixtieth) degrees, which comes to 0.3333... decimal degrees.
Children