Design Chart 4-3 — O-Ring Face Seal Glands

This tool reproduces 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 (Chart 4-3)
Face Seal Gland — Selected Cross-Section
Click any row below to load its dimensions; the diagram defaults to the first row shown.
Face seal cross-section:— External Pressure OD: — External Pressure Width: — Internal Pressure OD: — Internal Pressure Width: — — — — — — —
AS568
Size		 O-Ring
I.D.		 Gland Dimensions (in) Pressure-Direction Groove Dia.
A
Bore Dia
(Male)		 A1
Groove Dia
(Female)		 B
Tube OD
(Female)		 B1
Groove Dia
(Male)		 C
Plug Dia
(Male)		 D
Throat Dia
(Female)		 Internal Press.
HO (Mean O.D.)		 External Press.
HI (Mean I.D.)
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°.

Groove Diameter Calculator

A face seal groove is dimensioned by its diameter and width. The controlling diameter depends on the pressure direction:

  • Internal pressure (outward) — dimension the groove by its outside diameter HD. HD = Mean O.D. of the O-ring; tolerance = −1% of Mean O.D., but not more than −.060.
  • External pressure (inward) — dimension the groove by its inside diameter H. H = Mean I.D. of the O-ring; tolerance = +1% of Mean I.D., but not more than +.060.

Mean O.D. and Mean I.D. are taken from the O-ring dimension table (Parker Design Table 4-2 / AS568).

Enter the O-ring mean diameter (in) above.
Column Definitions
Face Seal Gland Dimensions — Design Chart 4-3
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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