O-ring groove dimensions, reciprocating (dynamic) gland, piston and rod, AS568 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/oring-gland-dynamic-reciprocating-as568/  (sheet CC BY 4.0)
Basis: Parker O-Ring Handbook ORD 5700, Design Chart 5-2 (Industrial Reciprocating O-Ring Packing Glands), AS568 cross-sections .070 to .275 in
Catalog version: 2026-10-20

Sizes: see table below
- Depth L is the radial gland depth: the distance from the bore (piston seal) or the rod surface (rod seal) to the groove bottom. Piston gland: groove root Ø = bore Ø - 2L. Rod gland: groove root Ø = rod Ø + 2L. Widths G, G1, G2 are for no, one and two back-up rings.
- Squeeze, depth and clearance are tabulated as ranges because the O-ring, groove and bore each carry a tolerance. All figures are inches as printed; the sample files use the middle of each range, stated in the file notes.
- Reciprocating means a rod or piston slides through the ring: the squeeze is lower than static (about 8 to 25%) so the ring does not drag or heat. Widths, radii, diametral clearance and eccentricity are the same as for the static chart; only depth and squeeze change.
- The chart prints a surface finish of 32 RMS without a back-up ring and 63 RMS with one; corners are broken about .005 in radius, lead-in 0 to 5 degrees.
- Files: for each of the five cross-sections a piston-style sample ring (grooves in the outside) and a rod-style sample block (grooves in the bore), each carrying the three widths (no / 1 / 2 back-up) side by side, in true section at a sample diameter of 2.000 in. Groove-bottom corners are rounded at the middle of the printed radius range; the groove mouth is broken at the printed 0.005 in radius. Walls are square (the drawing's 0 to 5 degree draft is not modelled).
- Back-up rings themselves are not modelled, and nothing here is a tolerance or fit statement for your own machining or print process: add your process allowance.

AS568 series (dash sizes)  cross-section W, in  gland depth L, in  squeeze, in  squeeze, %  diametral clearance, in  groove width G, no back-up, in  G1, 1 back-up, in  G2, 2 back-ups, in  groove radius R, in  max eccentricity, in
-0xx (006 to 012)  0.070 ± 0.003  0.055 to 0.057  0.010 to 0.018  15 to 25  0.002 to 0.005  0.093 to 0.098  0.138 to 0.143  0.205 to 0.210  0.005 to 0.015  0.002
-1xx (104 to 116)  0.103 ± 0.003  0.088 to 0.090  0.010 to 0.018  10 to 17  0.002 to 0.005  0.140 to 0.145  0.171 to 0.176  0.238 to 0.243  0.005 to 0.015  0.002
-2xx (201 to 222)  0.139 ± 0.004  0.121 to 0.123  0.012 to 0.022  9 to 16  0.003 to 0.006  0.187 to 0.192  0.208 to 0.213  0.275 to 0.280  0.010 to 0.025  0.003
-3xx (309 to 349)  0.210 ± 0.005  0.185 to 0.188  0.017 to 0.030  8 to 14  0.003 to 0.006  0.281 to 0.286  0.311 to 0.316  0.410 to 0.415  0.020 to 0.035  0.004
-4xx (425 to 460)  0.275 ± 0.006  0.237 to 0.240  0.029 to 0.044  11 to 16  0.004 to 0.007  0.375 to 0.380  0.408 to 0.413  0.538 to 0.543  0.020 to 0.035  0.005

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Parker Hannifin O-Ring Division (chart as copied by All Seals Inc.): Parker O-Ring Handbook ORD 5700, Design Chart 5-2: Industrial Reciprocating O-Ring Packing Glands — web — Publisher's page; dimensions are facts — https://allsealsinc.com/pdfs/Dynamic-oring-glands.pdf
- Parker Hannifin O-Ring Division: Parker O-Ring Handbook ORD 5700 (full handbook, Sections IV and V: static and dynamic O-ring sealing) — web — Publisher's page; dimensions are facts — https://discover.parker.com/Parker-ORing-Handbook-ORD-5700

Free files (CC BY 4.0, Xem Studio; STEP + STL, 10 parts): https://xemstudio.com/files/hardware/oring-gland-dynamic-reciprocating-as568/index.json
API: https://xemstudio.com/api/geometry?object=oring-gland-dynamic-reciprocating-as568