O-Ring Grooves Spec Table
2 types of spec data
O-ring groove dimension tables specify groove width (w) and depth (h) so that the O-ring achieves its required compression ratio for sealing. Dynamic grooves use 8–16% compression to minimize friction; static grooves use 15–30% for sealing reliability. Corner radii and surface roughness (dynamic: Ra 0.2–0.4μm) must be maintained to ensure O-ring service life.
Frequently Asked Questions
What is the difference between dynamic groove and static groove dimensions?
Dynamic grooves are for O-rings in sliding contact (pistons, rods). Static grooves are for non-moving seals (flanges, covers). Groove dimensions (width, depth) and compression ratios differ.
What is the recommended surface roughness for O-ring grooves?
Dynamic groove bottom: Ra 0.4–0.8; static grooves: Ra 1.6–3.2. Groove sides: Ra ≤1.6. Poor surface finish causes O-ring wear and leakage.