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

Parker 8-125 backup ring envelope (uncut)

Parker 8-125 backup ring envelope (uncut): ID 1.331 in (33.81 mm), OD 1.503 in (38.18 mm), thickness 0.053 in (1.35 mm); for the AS568 -125 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

dash8-125
ID (in)1.331
OD (in) = ID + 2W1.503
radial width W (in)0.086
thickness T (in)0.053
ID (mm)33.81
OD (mm)38.18
T (mm)1.35
cross-checkMcMaster ID and OD agree
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