Design Chart — O-Ring Face Seal Glands

This tool references and improves the functionality of Design Chart 4-3 from the Parker O-Ring Handbook (“ORD 5700”), which gives gland dimensions intended primarily for face-type O-ring seals and low-temperature applications. Pick a cross-section size to load its gland depth, squeeze, groove width and groove radius; all dimensions are in inches.

A face seal groove is dimensioned by its diameter and width rather than by bore/plug diameters. Use the Groove Diameter Calculator below to size the groove O.D. (HD) for internal pressure or the groove I.D. (H) for external pressure from the O-ring mean diameter.

Face Seal Gland Lookup
Face Seal Gland — Selected Cross-Section
Click any row below to load its dimensions; the diagram defaults to the first row shown.
Selected ring:— Internal Pressure OD: — Internal Pressure Width: — External Pressure ID: — External Pressure Width: — — — — — — —
AS568
Dash No.		 O-Ring
I.D.		 I.D.
Tolerance		 W
Cross Section		 L
Gland Depth		 Squeeze G
Groove Width		 R
Groove Radius
Nominal Actual Actual % Liquids Vacuum
and Gases
Loading…

These dimensions are intended primarily for face-type O-ring seals and low-temperature applications. Squeeze is the O-ring cross-section W minus the gland depth L. Surface finish X: 32µin RMS for liquids, 16µin RMS for vacuum and gases. Break corners approx. .005 radius; gland side angle 0° to 5°.

AS568
Dash No.		 W
Cross Section		 L
Gland Depth		 Squeeze G
Groove Width		 R
Groove Radius
Nominal Actual Actual % Liquids Vacuum
and Gases
004 through 050 1/16 .070 ±.003
(1.78 mm)		 .050 to .054 .013 to .023 19 to 32 .101 to .107 .084 to .089 .005 to .015
102 through 178 3/32 .103 ±.003
(2.62 mm)		 .074 to .080 .020 to .032 20 to 30 .136 to .142 .120 to .125 .005 to .015
201 through 284 1/8 .139 ±.004
(3.53 mm)		 .101 to .107 .028 to .042 20 to 30 .177 to .187 .158 to .164 .010 to .025
309 through 395 3/16 .210 ±.005
(5.33 mm)		 .152 to .162 .043 to .063 21 to 30 .270 to .290 .239 to .244 .020 to .035
425 through 475 1/4 .275 ±.006
(6.99 mm)		 .201 to .211 .058 to .080 21 to 29 .342 to .362 .309 to .314 .020 to .035
Special 3/8 .375 ±.007
(9.52 mm)		 .276 to .286 .082 to .106 22 to 28 .475 to .485 .419 to .424 .030 to .045
Special 1/2 .500 ±.008
(12.7 mm)		 .370 to .380 .112 to .138 22 to 27 .638 to .645 .560 to .565 .030 to .045
Column Definitions
Face Seal Gland Dimensions
Column Symbol Description Value
O-Ring Size—AS568 dash-number range covered by the cross-section (Parker No. 2 series).—
WWO-ring cross-section diameter — nominal fraction and actual value with tolerance.Nominal ± tol
LLGland depth (= groove depth). The axial depth of the face seal groove.Min – Max
Squeeze—Diametral compression on the O-ring cross-section. Squeeze = W − L.Actual & %
GGGroove width. Wider for liquids; narrower for vacuum and gas service.Min – Max
RRGroove bottom radius.Min – Max
H₄H₄Groove outside diameter for internal (outward) pressure = Mean O.D. of O-ring.−1% (max −.060)
HHGroove inside diameter for external (inward) pressure = Mean I.D. of O-ring.+1% (max +.060)
Source & Important Notices
  • Source: Parker O-Ring & Engineered Seals Division, Parker O-Ring Handbook (ORD 5700), Design Chart 4-3: Design Chart for O-Ring Face Seal Glands. Parker Hannifin Corporation, 2360 Palumbo Drive, Lexington, KY 40509.
  • No Parker affiliation or endorsement. Parker Hannifin Corporation has not participated in the development of this lookup tool and does not approve or endorse it. Verify all dimensions against the current edition of the Parker O-Ring Handbook before use in design.
  • Face seal application. These glands are intended primarily for face-type O-ring seals and low-temperature applications. Dimension the groove by its diameter (HD or H) per the pressure direction, and by its width G.
  • Verify critical dimensions. Always confirm gland dimensions against the current Parker O-Ring Handbook for safety-critical or pressure-containing applications. This tool is a reference aid, not a substitute for engineering judgment.

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