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The outer diameter and length of the new national standard steel rebar coupler are:
Stripped rib rolled straight thread connection 400E (grade 3 steel): (outer diameter × length) (mm)
Φ12(18×28)Φ14(21×32)Φ16(24×36)Φ18(27×41)Φ20(30×45)Φ22(32.5×49)Φ25(37×56)Φ28(41.5×62)Φ32( 47.5×70) Φ36 (53×78) Φ40 (59×86)
Φ50（74×106）
Stripped rib rolled straight thread connection 500E (fourth grade steel): (outer diameter × length) (mm)
Φ12(19×32)Φ14(22×36)Φ16(25×40)Φ18(28.5×46)Φ20(31.5×50)Φ22(34.5×54)Φ25(39.5×62)Φ28(44×68)Φ32( 50.5×76) Φ36 (56.5×84) Φ40 (62.5×92) Φ50 (78×112)
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