* 영국표준규격(英國標準規格)의 스퍼어기어(spur gear) 강도계수(强度係數) 강도계수 强度係數 Y 상대기어 치수(相對gear 齒數) 10 12 14 16 18 20 25 30 40 50 70 100 150 200 랙 (rack) 계산(計算)해야할 기어치수(gear齒數) 10 - - - - - .55 .57 .58 .60 .62 .65 .67 .69 .69 .71 11 - - - - - .54 .56 .57 .59 .61 .64 .66 .68 .68 .70 12 - - - - - .52 .55 .56 .59 .60 .63 .65 .67 .68 .70 13 - - - - - .51 .54 .56 .58 .60 .63 .65 .67 .68 .70 14 - - - - - .50 .54 .56 .59 .60..