DMS SEALS TECHNOLOGY CO.,LIMITED

The Professional Sealing Solution Supplier(O Ring Suppliers & Oil Seal Manufacturers).

DMS Seals - Hydraulic Seals and Oil Ring Seals Manufacturer & Supplier

Mail to: dms@dmsseals.com tel:+86-757-86235767

Do you know the difference between Piston seals and Rod seals？

2026-03-17

Piston seals: It is a sealing ring installed in the inner groove of a bore, mainly used to seal media (oil, gas, water, etc.) during the relative movement of the shaft, and to prevent media leakage from the clearance between the bore and the shaft.
Generally, for PTFE + O-ring combinations, the PTFE is on the outside and the O-ring is on the inside.

Do you know the difference between Piston seals and Rod seals？ 1

Rod seals:It is a sealing component installed in the outer circumferential groove of a shaft (piston rod, spindle). It moves with the shaft and forms a tight fit between its outer edge and the inner wall of the bore (cylinder barrel, end cover) to prevent media from leaking outward along the shaft.
Generally, for PTFE + O-ring combinations, the PTFE is on the inside and the O-ring is on the outside.

Do you know the difference between Piston seals and Rod seals？ 2

Piston seals VS Rod seals
Core differences: installation position, sealing object, and opposite direction.
1. Bore Seal (Installed in the bore)

Installation position: Fitted in the groove on the inner wall of the bore/cylinder tube
Sealing object: Seals the reciprocating shaft/piston rod
Pressure direction: Contracts inward to hold the shaft
Typical application: Inner wall of hydraulic cylinder tube

2.Shaft Seal (Installed on the shaft)