API Standard relearing Back Off Spear

มม. (นิ้ว)

มม. (นิ้ว)

DLM-T60

60.33 (2-3/8)

50.8 (2)

2-3/8REG

DLM-T73

73 (2-7/8)

57.2 (2-1/4) 〜77.9 (3-1/16)

NC31

DLM-T89

88.9 (3-1/2)

76.2 (3) -90.1 (3-35/64)

NC31

DLM-T114

114 (4-1/2)

97.2 (3-53/64) 〜103.6 (4-5/64)

4-1/2REG

DLM-T127

127 (5)

108.7 (4-9/32) 〜115.8 (4-9/16)

4-1/2REG

DLM-T140

139.7 (5-1/2)

118.6 (4-43/64) 〜127.3 (5-1/64)

NC50