Design Table 4-1 — Gland Design, O-Ring and Other Elastomeric Seals (SAE AS5857)

This table reproduces Design Table 4-1 from the Parker O-Ring Handbook (“ORD 5700”), covering gland design dimensions for O-ring and other elastomeric seals per SAE AS5857. It spans the full AS568 dash-number range (0XX, 1XX, 2XX, 3XX and 4XX series).

Use the search box to filter by dash number. All dimensions are in inches. Each dash number lists maximum and minimum limits for every gland feature.

Gland Dimension Lookup (Table 4-1)
Gland Cross-Section — Selected Ring
Click any row below to load its dimensions; the diagram defaults to the first row shown.
Selected ring:— — — — — — — — — — — — — — — —
All dimensions in inches. Each dash number lists two rows: maximum (top) over minimum (bottom), matching the Parker O-Ring Handbook Design Table 4-1 layout.
AS568
Dash No.		 Piston /
Cylinder OD		 Cylinder
Bore ID		 Gland OD Rod / Gland
Sleeve OD		 Rod
Bore ID		 Gland ID
CAFBHE
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* These designs require considerable installation stretch. If assembly breakage is incurred, use a compound having higher elongation or use a two-piece piston.    † This groove width does not permit the use of Parbak® rings. For pressures above 103.5 bar (1500 psi), consult Design Chart 4-2 for groove widths where back-up rings must be used.

Design Chart 4-1 A — Gland Width for Backup Rings
Gland and
AS568 Dash
Number		 O-Ring Cross
Section W		 Backup Ring
Width Max.		 Gland Width G
No Backup Ring		 Gland Width G
One Backup Ring		 Gland Width G
Two Backup Rings
Min.Max. Min.Max. Min.Max. Min.Max.
001.037.043--.090.095--------
002.047.053--.095.100--------
003.057.063--.105.110--------
004 to 007.067.073.056.115.120.174.184.230.240
008 to 028.067.073.056.105.110.164.174.220.230
104 to 109.100.106.060.150.160.210.220.275.285
110 to 149.100.106.060.140.150.200.210.265.275
210 to 247.135.143.065.185.195.250.260.320.330
325 to 349.205.215.090.270.280.360.370.455.465
425 to 460.269.281.130.345.355.475.485.610.620

Design Chart 4-1 A: Gland Design, O-Ring and Other Elastomeric Seals (SAE AS5857). Standard Gland Width for Zero, One, and Two Backup Rings in Inches. Dashes 001–003 do not accommodate backup rings.

Design Chart 4-1 B — Diametral Clearance Dimensions
Gland and
AS568 Dash
Number		 O-Ring Cross-Section W Diametral Clearance D Max.
Min.Max. ExteriorInterior
001 .037.043.004.004
002 .047.053.004.004
003 .057.063.004.004
004 to 012 .067.073.004.004
013 to 029 .067.073.005.005
104 to 109 .100.106.004.004
110 to 126 .100.106.004.004
127 to 129 .100.106.005.006
130 to 132 .100.106.006.006
133 to 140 .100.106.006.007
141 to 149 .100.106.007.007
210 to 222 .135.143.005.005
223 to 224 .135.143.006.006
225 to 227 .135.143.006.007
228 to 243 .135.143.007.007
244 to 245 .135.143.008.007
246 to 247 .135.143.008.008
325 to 327 .205.215.006.006
328 to 329 .205.215.006.007
330 to 345 .205.215.007.007
346 to 349 .205.215.008.007
425 to 438 .269.281.009.009
439 to 445 .269.281.009.010
446 .269.281.010.010
447 to 460 .269.281.011.010

Design Chart 4-1 B: Gland Design, O-Ring and Other Elastomeric Seals (SAE AS5857). Standard Gland Diametral Clearance Dimensions in Inches.

Design Chart 4-2 — Industrial O-Ring Static Seal Glands
O-Ring 2-Size
AS568B-		 W Cross-Section L Gland
Depth		 Squeeze E(a) Diametral
Clearance		 G – Groove Width R Groove
Radius		 Max.
Eccentricity (b)
Nominal Actual Actual % No Parbak
Ring (G)		 One Parbak
Ring (G₁)		 Two Parbak
Rings (G₂)
004
through
050		1/16.070 ±.003
(1.78 mm)		.050
to
.052		.015
to
.023		22
to
32		.002
to
.005		.093
to
.098		.138
to
.143		.205
to
.210		.005
to
.015		.002
102
through
178		3/32.103 ±.003
(2.62 mm)		.081
to
.083		.017
to
.025		17
to
24		.002
to
.005		.140
to
.145		.171
to
.176		.238
to
.243		.005
to
.015		.002
201
through
284		1/8.139 ±.004
(3.53 mm)		.111
to
.113		.022
to
.032		16
to
23		.003
to
.006		.187
to
.192		.208
to
.213		.275
to
.280		.010
to
.025		.003
309
through
395		3/16.210 ±.005
(5.33 mm)		.170
to
.173		.032
to
.045		15
to
21		.003
to
.006		.281
to
.286		.311
to
.316		.410
to
.415		.020
to
.035		.004
425
through
475		1/4.275 ±.006
(6.99 mm)		.226
to
.229		.040
to
.055		15
to
20		.004
to
.007		.375
to
.380		.408
to
.413		.538
to
.543		.020
to
.035		.005

(a) Clearance (extrusion gap) must be held to a minimum consistent with design requirements for temperature range variation.

(b) Total indicator reading between groove and adjacent bearing surface.

(c) Reduce maximum diametral clearance 50% when using silicone or fluorosilicone O-rings.

(d) For ease of assembly, when Parbaks are used, gland depth may be increased up to 5%.

Column Definitions
Gland Dimension Columns — Design Table 4-1
Column Symbol Description Limits
AS568 Dash No.—Standard AS568 dash number identifying the O-ring size. Unique identifier for each gland row.—
CCPiston or Cylinder OD — the outside diameter of the piston (male) member.Max / Min
AACylinder Bore ID — the bore that the gland seals within.Max / Min
FFGland OD — the outside diameter of the gland groove.Max / Min
BBRod or Gland Sleeve OD — the rod (or sleeve) outside diameter.Max / Min
HHRod Bore ID — the rod bore inside diameter.Max / Min
EEGland ID — the inside diameter of the gland groove.Max / Min

Cross-section series: The first digit of the dash number encodes the nominal O-ring cross-section diameter (cs):

  • 2XX — 0.103″ cs, G† = 0.140″
  • 3XX — 0.139″ cs, G† = 0.187″
  • 4XX — 0.210″ cs, G† = 0.281″
  • 5XX — 0.275″ cs, G† = 0.375″

Remaining digits encode the O-ring inner diameter in a systematic sequence. The full dash number (e.g., 3-214) is the standard way to specify a Parker O-ring for procurement.

Source & Important Notices
  • Source: Parker O-Ring & Engineered Seals Division, Parker O-Ring Handbook (ORD 5700), Design Table 4-1: Gland Design, O-Ring and Other Elastomeric Seals (SAE AS5857). 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.
  • 1500 psi maximum. The groove widths in Design Table 4-2 do not accommodate Parbak® back-up rings. For applications above 103.5 bar (1500 psi), consult Design Chart 4-2 in the handbook for groove widths where back-up rings must be used.
  • 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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