Xem Studiomeasured geometry

Library › Hardware › Backup rings for AS568 O-rings (Parker 8-xxx Parbak, 8-004 to…

Parker 8-161 backup ring envelope (uncut)

Parker 8-161 backup ring envelope (uncut): ID 5.518 in (140.16 mm), OD 5.690 in (144.53 mm), thickness 0.053 in (1.35 mm); for the AS568 -161 O-ring

Exact dimensions. True size, no tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

dash8-161
ID (in)5.518
OD (in) = ID + 2W5.690
radial width W (in)0.086
thickness T (in)0.053
ID (mm)140.16
OD (mm)144.53
T (mm)1.35
cross-check—
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
Set it up →

From the full sheet

Backup rings for AS568 O-rings (Parker 8-xxx Parbak, 8-004 to 8-475): ID, OD, width and thickness per dash size: every size, notes, mating features and sources. What are the ID, OD and thickness of an 8-214 (or 8-110, 8-325) backup ring for an AS568 O-ring?

Other sizes