ISO 5969:1979/Cor 1:1991

Subclause 3.5: delete the title and insert: "3.5 Tolerance on half-angle alpha/2 of thread"; Table 3: For size designation "1/8" delete the value of minimum major diameter "9.865" and insert "9.685"; Tables 5 and 6: In the columns "Tap designation" delete "Tolerance on angle alpha and half-angle alpha/2" and insert "Tolerance on half-angle alpha/2".