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      Piston Assembly is main parts of mud pump fluid end, piston Assembly is reciprocating linear motion within cylinder liner, thereby creating a mud pump discharge pressure.
The metric parameters of piston

Specification	Size“A”	Size“B”	Weight (Kg)
F100	F103	73	2.23
F110	F113	73	2.69
F120	F123	73	3.21
F130	F134	79	4.49
F140	F145	79	5.35
F150	F155	79	6.11
F160	F165	84	8.22
F170	F175	84	9.05
F180	F185	84	9.81

Imperial parameters of piston

Specification	Size “A”	Size “B”	Weight (Kg)
4?	F105	73	2.2
4-1/2?	F117	73	3.17
5?	F130	79	4.5
5-1/2?	F144	79	5.38
6?	F155	79	6.32
6-1/4?	F163	84	8.31
6-1/2?	F169	84	8.77
6-3/4?	F175	84	9.43
7?	F181	84	9.96