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General Purpose Couplings Hydraulic Quick Couplings SM Series Couplers Body Part Dimensions (in.) Size No. Thread Overall Hex Largest Wt. (LB.) Female Thread (in.) Steel Size Length Size Diameter P/Piece A B C 1/4 SM-251-4FP 1/4-18 NPSF 1.89 0.75 1.06 0.24 1/4 SM-251-4FB G1/4 BSPP 2.04 0.75 1.06 0.26 1/4 SM-251-6FP 3/8-18 NPSF 2.04 0.94 1.06 0.28 1/4 SM-251-6FB G3/8 BSPP 2.04 0.94 1.06 0.26 1/4 SM-251-6FO 9/16-18ORB 2.04 0.75 1.06 0.25 1/2 SM-501-8FP 1/2-14 NPSF 2.81 1.25 1.56 0.70 1/2 SM-501-8FB G1/2 BSPP 2.95 1.25 1.56 0.74 C 1/2 SM-501-12FP 3/4-14 NPSF 2.99 1.37 1.56 0.81 1/2 SM-501-12FB G3/4 BSPP 3.16 1.37 1.56 0.85 1/2 SM-501-8FO 3/4-16ORB 2.95 1.25 1.56 0.70 B 3/4 SM-751-12FO 1 1/16-12ORB 3.62 1.62 2.25 1.78 A 3/4 SM-751-12FP 3/4-14 NPSF 3.62 1.62 2.22 1.83 3/4 SM-751-12FB G3/4 BSPP 3.76 1.62 2.22 1.88 3/4 SM-751-16FP 1-11 1/2 NPSF 3.90 1.62 2.22 1.84 3/4 SM-751-16FB G 1 BSPP 3.90 1.62 2.22 1.89 3/4 SM-751-16FO 1-5/16-12ORB 3.90 1.62 2.22 1.89 Nipples Body Part Dimensions (in.) Size No. Thread Overall Exposed* Hex Largest Wt. (LB.) Female Thread (in.) Steel Size Length Length Size Diameter P/Piece D E F G 1/4 SM-252-4FP 1/4-18 NPSF 1.29 0.50 0.75 0.87 0.08 1/4 SM-252-4FB G1/4 BSPP 1.44 0.65 0.75 0.87 0.09 1/4 SM-252-6FP 3/8-18 NPSF 1.60 0.81 0.94 1.08 0.14 1/4 SM-252-6FB G3/8 BSPP 1.60 0.81 0.94 1.08 0.14 1/4 SM-252-6FO 9/16-18ORB 1.44 0.55 0.75 0.87 0.08 1/2 SM-502-8FO 3/4-16ORB 2.27 0.72 1.06 1.23 0.16 1/2 SM-502-8FP 1/2-14 NPSF 1.81 0.45 1.06 1.23 0.15 1/2 SM-502-8FB G1/2 BSPP 1.96 0.60 1.06 1.23 0.18 G 1/2 SM-502-12FP 3/4-14 NPSF 2.27 0.90 1.37 1.59 0.30 1/2 SM-502-12FB G3/4 BSPP 2.44 1.07 1.37 1.59 0.34 3/4 SM-752-12FO 1 1/16-12ORB 2.33 0.39 1.50 1.73 0.48 F E 3/4 SM-752-12FP 3/4-14 NPSF 2.33 0.39 1.50 1.73 0.52 D 3/4 SM-752-12FB G3/4 BSPP 2.79 0.53 1.50 1.73 0.56 3/4 SM-752-16FP 1-11 1/2 NPSF 2.61 0.67 1.62 1.88 0.56 3/4 SM-752-16FB G 1 BSPP 2.61 0.67 1.62 1.88 0.68 3/4 SM-752-16FO 1-5/16-12ORB 2.61 0.67 1.62 1.88 0.68 * This dimension represents the portion that is exposed when the nipple is inserted into the mating parker Coupler.BHydraulics Optional Seals Optional Seals Suffix (Standard seals are Buna-N) E4 Flourocarbon E5 Ethylene Propylene (EPR) E12 Neoprene Perfluoroelastomer (Contact Factory for Seal Options) Quick Coupling Division 8145 Lewis Road · Minneapolis, MN 55427 B-13 www.parker.com/quickcouplings
