# O-ring groove dimensions, static radial gland (piston and rod), AS568 cross-sections

> How deep and wide is the groove for an AS568 O-ring in a static piston or rod seal?

- Category: Hardware › Bearings, rails & motion
- Kind: Standard part
- Basis: Parker O-Ring Handbook ORD 5700, Design Chart 4-1 (Industrial Static Seal Glands), AS568 cross-sections .070 to .275 in
- Page: https://xemstudio.com/objects/oring-gland-static-radial-as568/ · JSON: https://xemstudio.com/api/geometry?object=oring-gland-static-radial-as568 · Plain text: https://xemstudio.com/objects/oring-gland-static-radial-as568/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

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

## 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.
- Static means no relative motion once assembled (a plug, a cap on a tube, a sleeve). The squeeze is higher than for a moving seal because nothing slides on the ring. For a moving rod or piston see the reciprocating gland page.
- Typical use: a 2-214 on a cap is -2xx, so cross-section .139 in: depth .111 to .113 in, groove .187 to .192 in wide with no back-up ring, bottom radius .010 to .025 in, up to .003 to .006 in diametral clearance.
- 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.

## Sizes

| 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 (004 to 050) | 0.070 ± 0.003 | 0.050 to 0.052 | 0.015 to 0.023 | 22 to 32 | 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 (102 to 178) | 0.103 ± 0.003 | 0.081 to 0.083 | 0.017 to 0.025 | 17 to 24 | 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 284) | 0.139 ± 0.004 | 0.111 to 0.113 | 0.022 to 0.032 | 16 to 23 | 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 395) | 0.210 ± 0.005 | 0.170 to 0.173 | 0.032 to 0.045 | 15 to 21 | 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 475) | 0.275 ± 0.006 | 0.226 to 0.229 | 0.040 to 0.055 | 15 to 20 | 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

- Parker Hannifin O-Ring Division (chart as copied by All Seals Inc.): [Parker O-Ring Handbook ORD 5700, Design Chart 4-1: Industrial Static Seal Glands (radial, AS568 cross-sections)](https://allsealsinc.com/pdfs/Static-oring-glands.pdf) — 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)](https://discover.parker.com/Parker-ORing-Handbook-ORD-5700) — web — Publisher's page; dimensions are facts

## Free STEP/STL (10 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/index.json

- gland-static-piston-sample-cs070: [STEP](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-piston-sample-cs070.step) · [STL](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-piston-sample-cs070.stl) — -0xx series, cross-section 0.070 in: gland depth 0.0510 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.
- gland-static-rod-sample-cs070: [STEP](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-rod-sample-cs070.step) · [STL](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-rod-sample-cs070.stl) — -0xx series, cross-section 0.070 in: gland depth 0.0510 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 2.1020 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.
- gland-static-piston-sample-cs103: [STEP](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-piston-sample-cs103.step) · [STL](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-piston-sample-cs103.stl) — -1xx series, cross-section 0.103 in: gland depth 0.0820 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.
- gland-static-rod-sample-cs103: [STEP](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-rod-sample-cs103.step) · [STL](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-rod-sample-cs103.stl) — -1xx series, cross-section 0.103 in: gland depth 0.0820 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 2.1640 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.
- gland-static-piston-sample-cs139: [STEP](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-piston-sample-cs139.step) · [STL](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-piston-sample-cs139.stl) — -2xx series, cross-section 0.139 in: gland depth 0.1120 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.
- gland-static-rod-sample-cs139: [STEP](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-rod-sample-cs139.step) · [STL](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-rod-sample-cs139.stl) — -2xx series, cross-section 0.139 in: gland depth 0.1120 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 2.2240 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.
- gland-static-piston-sample-cs210: [STEP](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-piston-sample-cs210.step) · [STL](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-piston-sample-cs210.stl) — -3xx series, cross-section 0.210 in: gland depth 0.1715 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.
- gland-static-rod-sample-cs210: [STEP](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-rod-sample-cs210.step) · [STL](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-rod-sample-cs210.stl) — -3xx series, cross-section 0.210 in: gland depth 0.1715 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 2.3430 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.
- gland-static-piston-sample-cs275: [STEP](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-piston-sample-cs275.step) · [STL](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-piston-sample-cs275.stl) — -4xx series, cross-section 0.275 in: gland depth 0.2275 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.
- gland-static-rod-sample-cs275: [STEP](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-rod-sample-cs275.step) · [STL](https://xemstudio.com/files/hardware/oring-gland-static-radial-as568/gland-static-rod-sample-cs275.stl) — -4xx series, cross-section 0.275 in: gland depth 0.2275 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 2.4550 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.

## Questions

**How deep should the groove be for a -2xx (0.139 in) O-ring in a static radial seal?**

L = .111 to .113 in; groove width .187 to .192 in with no back-up ring (squeeze .022 to .032 in, 16 to 23%).

**What is the groove radius for AS568 -0xx static glands?**

.005 to .015 in at the groove bottom corners; .010 to .025 in for -2xx, .020 to .035 in for -3xx and -4xx.

**How wide is the groove with a back-up ring?**

Add the ring thickness: for -2xx, G1 = .208 to .213 in with one back-up ring and G2 = .275 to .280 in with two.

## Fits with

- [AS568 O-rings: all 349 standard sizes, -001 to -475](https://xemstudio.com/objects/as568-o-rings/)
- [O-ring groove dimensions, reciprocating (dynamic) gland, piston and rod, AS568](https://xemstudio.com/objects/oring-gland-dynamic-reciprocating-as568/)
- [Metric O-ring groove dimensions: depth, width and radius, 1.0 to 5.7 mm cross-sections](https://xemstudio.com/objects/oring-grooves-metric/)
- [O-rings, common metric sizes (ISO 3601)](https://xemstudio.com/objects/o-rings-metric/)