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O-ring groove dimensions, reciprocating (dynamic) gland, piston and rod, AS568

Name: O-ring groove dimensions, reciprocating (dynamic) gland, piston and rod, AS568 dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How deep and wide is the groove for an AS568 O-ring on a sliding piston or rod? · Standard part · basis: Parker O-Ring Handbook ORD 5700, Design Chart 5-2 (Industrial Reciprocating O-Ring Packing Glands), AS568 cross-sections .070 to .275 in

Also called: dynamic o-ring groove, o-ring groove dimensions piston, reciprocating o-ring gland, rod seal o-ring groove, o ring groove depth dynamic, o ring gland design, as568 -2xx groove, piston groove o-ring, o ring squeeze dynamic, hydraulic o-ring groove

Exact dimensions. True size, with no printing tolerance added.

sizes: 5 in table

Notes

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.

O-ring groove dimensions, reciprocating (dynamic) gland, piston and… size chart

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

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

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
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

Free files

★ Free files 10 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

gland-dynamic-piston-sample-cs070	-0xx series, cross-section 0.070 in: gland depth 0.0560 in, groove-bottom radius 0.0100 in, mouth edge break 0.005 in, widths no / 1 / 2 back-up ring 0.0955 / 0.1405 / 0.2075 in. Piston-style sample ring (grooves in the outside): bore 2.000 in, piston Ø 1.9965 in (bore less the mid diametral clearance 0.0035 in), hole Ø 1.000 in, 0.200 in lands. Middle of each printed range; the layout is a sample, not a standard.	STEP · STL
gland-dynamic-rod-sample-cs070	-0xx series, cross-section 0.070 in: gland depth 0.0560 in, groove-bottom radius 0.0100 in, mouth edge break 0.005 in, widths no / 1 / 2 back-up ring 0.0955 / 0.1405 / 0.2075 in. Rod-style sample block (grooves in the bore): rod Ø 2.000 in, housing bore Ø 2.0035 in (rod plus the mid diametral clearance), groove root Ø 2.1120 in, 0.200 in lands, 0.500 in wall outside the root. Middle of each printed range; the layout is a sample, not a standard.	STEP · STL
gland-dynamic-piston-sample-cs103	-1xx series, cross-section 0.103 in: gland depth 0.0890 in, groove-bottom radius 0.0100 in, mouth edge break 0.005 in, widths no / 1 / 2 back-up ring 0.1425 / 0.1735 / 0.2405 in. Piston-style sample ring (grooves in the outside): bore 2.000 in, piston Ø 1.9965 in (bore less the mid diametral clearance 0.0035 in), hole Ø 1.000 in, 0.200 in lands. Middle of each printed range; the layout is a sample, not a standard.	STEP · STL
gland-dynamic-rod-sample-cs103	-1xx series, cross-section 0.103 in: gland depth 0.0890 in, groove-bottom radius 0.0100 in, mouth edge break 0.005 in, widths no / 1 / 2 back-up ring 0.1425 / 0.1735 / 0.2405 in. Rod-style sample block (grooves in the bore): rod Ø 2.000 in, housing bore Ø 2.0035 in (rod plus the mid diametral clearance), groove root Ø 2.1780 in, 0.200 in lands, 0.500 in wall outside the root. Middle of each printed range; the layout is a sample, not a standard.	STEP · STL
gland-dynamic-piston-sample-cs139	-2xx series, cross-section 0.139 in: gland depth 0.1220 in, groove-bottom radius 0.0175 in, mouth edge break 0.005 in, widths no / 1 / 2 back-up ring 0.1895 / 0.2105 / 0.2775 in. Piston-style sample ring (grooves in the outside): bore 2.000 in, piston Ø 1.9955 in (bore less the mid diametral clearance 0.0045 in), hole Ø 1.000 in, 0.200 in lands. Middle of each printed range; the layout is a sample, not a standard.	STEP · STL
gland-dynamic-rod-sample-cs139	-2xx series, cross-section 0.139 in: gland depth 0.1220 in, groove-bottom radius 0.0175 in, mouth edge break 0.005 in, widths no / 1 / 2 back-up ring 0.1895 / 0.2105 / 0.2775 in. Rod-style sample block (grooves in the bore): rod Ø 2.000 in, housing bore Ø 2.0045 in (rod plus the mid diametral clearance), groove root Ø 2.2440 in, 0.200 in lands, 0.500 in wall outside the root. Middle of each printed range; the layout is a sample, not a standard.	STEP · STL
gland-dynamic-piston-sample-cs210	-3xx series, cross-section 0.210 in: gland depth 0.1865 in, groove-bottom radius 0.0275 in, mouth edge break 0.005 in, widths no / 1 / 2 back-up ring 0.2835 / 0.3135 / 0.4125 in. Piston-style sample ring (grooves in the outside): bore 2.000 in, piston Ø 1.9955 in (bore less the mid diametral clearance 0.0045 in), hole Ø 1.000 in, 0.200 in lands. Middle of each printed range; the layout is a sample, not a standard.	STEP · STL
gland-dynamic-rod-sample-cs210	-3xx series, cross-section 0.210 in: gland depth 0.1865 in, groove-bottom radius 0.0275 in, mouth edge break 0.005 in, widths no / 1 / 2 back-up ring 0.2835 / 0.3135 / 0.4125 in. Rod-style sample block (grooves in the bore): rod Ø 2.000 in, housing bore Ø 2.0045 in (rod plus the mid diametral clearance), groove root Ø 2.3730 in, 0.200 in lands, 0.500 in wall outside the root. Middle of each printed range; the layout is a sample, not a standard.	STEP · STL
gland-dynamic-piston-sample-cs275	-4xx series, cross-section 0.275 in: gland depth 0.2385 in, groove-bottom radius 0.0275 in, mouth edge break 0.005 in, widths no / 1 / 2 back-up ring 0.3775 / 0.4105 / 0.5405 in. Piston-style sample ring (grooves in the outside): bore 2.000 in, piston Ø 1.9945 in (bore less the mid diametral clearance 0.0055 in), hole Ø 1.000 in, 0.200 in lands. Middle of each printed range; the layout is a sample, not a standard.	STEP · STL
gland-dynamic-rod-sample-cs275	-4xx series, cross-section 0.275 in: gland depth 0.2385 in, groove-bottom radius 0.0275 in, mouth edge break 0.005 in, widths no / 1 / 2 back-up ring 0.3775 / 0.4105 / 0.5405 in. Rod-style sample block (grooves in the bore): rod Ø 2.000 in, housing bore Ø 2.0055 in (rod plus the mid diametral clearance), groove root Ø 2.4770 in, 0.200 in lands, 0.500 in wall outside the root. Middle of each printed range; the layout is a sample, not a standard.	STEP · STL

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Plain text: sheet.txt · JSON: /api/geometry?object=oring-gland-dynamic-reciprocating-as568

O-ring groove dimensions, reciprocating (dynamic) gland, piston and rod, AS568, isometric render of a generated part — Render of gland-dynamic-rod-sample-cs139 from the free STEP; not to scale.

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Questions

How deep is the groove for a -2xx O-ring on a moving piston?

L = .121 to .123 in (squeeze .012 to .022 in, 9 to 16%); groove .187 to .192 in wide with no back-up ring.

What is the maximum eccentricity for a -3xx dynamic gland?

.004 in (cross-section .210 in); diametral clearance .003 to .006 in.

Why is a dynamic groove shallower to the O-ring than a static one?

The chart sets less squeeze for a sliding seal: e.g. -2xx static squeeze 16 to 23% against 9 to 16% reciprocating, so the groove is about .010 in deeper.