What size is an AS568-453 o-ring?

An AS568-453 o-ring has an inside diameter of 11.9750 in (304.170 mm) and a cross-section of 0.2750 in (6.990 mm), giving an outside diameter of 12.5250 in (318.150 mm).

What is an AS568-453 o-ring in mm?

304.170 mm inside diameter × 6.990 mm cross-section, 318.150 mm outside diameter. AS568 is an inch standard, so these are exact conversions rather than metric nominal sizes.

What is the tolerance on an AS568-453 o-ring?

AS568 allows ± 0.0598 in (± 1.520 mm) on the inside diameter and ± 0.0059 in (± 0.150 mm) on the cross-section, measured free-state.

What groove depth does an AS568-453 o-ring need?

For face seal, static service, a gland depth of 0.1953 to 0.2173 in (4.961 to 5.519 mm), which gives 21–29% squeeze on the 0.2750 in cross-section. Groove width and corner radius come from the seal manufacturer's chart.

Which AS568 series is the AS568-453 o-ring in?

Dash 453 is in the 425-475 band — AS568 1/4 in series, a 0.275 in cross-section. Every size in that band shares the same cross-section and therefore the same gland depth.

AS568 · dash 453 · 0.275 in cross-section

AS568-453 O-Ring Size — ID, Cross-Section, OD and Gland Data

https://shopmath.org/o-rings/as568-453 · data verified August 1, 2026

An AS568-453 o-ring is 11.9750 in (304.170 mm) inside diameter with a 0.2750 in (6.990 mm) cross-section, giving a 12.5250 in (318.150 mm) outside diameter. Static glands for this cross-section run 0.1953–0.2173 in deep. Dimensions are free-state, before installation.

Dash: 453
ID: 11.9750 in
CS: 0.2750 in
OD: 12.5250 in
Series: 425-475

AS568-453 o-ring · inside Ø × cross-section

11.9750 × 0.2750 in

Inside Ø: 304.170mm
Cross-section: 6.990mm
Outside Ø: 318.150mm

Free-state dimensions with AS568 tolerances of ± 0.0598 in on the ID and ± 0.0059 in on the cross-section.

AS568-453 O-Ring Dimensions and Tolerances

An AS568 o-ring is specified by its inside diameter and cross-section; the outside diameter follows from them. Tolerances are the AS568 free-state limits, measured uninstalled.

AS568-453 o-ring — inside diameter, cross-section and outside diameter with tolerances
Dimension	Inch	Millimetre
Inside diameter (ID)	11.9750 ± 0.0598	304.170 ± 1.520
Cross-section (CS / W)	0.2750 ± 0.0059	6.990 ± 0.150
Outside diameter (OD)	12.5250	318.150

OD = ID + 2 × CS. Elastomer parts are measured free-state and relax over time; the tolerances above are manufacturing limits, not the installed dimensions.

AS568-453 O-Ring Size in Millimetres

AS568 is an inch standard. These are the same dimensions converted exactly (1 in = 25.4 mm) — an AS568 size is not interchangeable with an ISO 3601 metric size that happens to be close.

AS568-453 o-ring — metric dimensions
Dimension	Inch	Millimetre
Nominal ID × CS	11.9750 × 0.2750 in	304.170 × 6.990 mm
Nominal OD × CS	12.5250 × 0.2750 in	318.150 × 6.990 mm

Metric figures are conversions of the AS568 inch dimensions, rounded to 0.01 mm as the source data carries them. A metric o-ring called out as 25 × 3.5 mm is a different part.

Static Gland Depth for a AS568-453 O-Ring

Squeeze and gland depth for the 0.275 in cross-section band this size belongs to, from MIL-G-5514G. Depth is what the groove is cut to; squeeze is what the ring gives up to seal.

Static gland squeeze and depth for the 425-475 cross-section series
Property	Squeeze		Gland depth
Application	%	in	in	mm
Face seal, static	21–29	0.0578–0.0798	0.1953–0.2173	4.961–5.519

Static applications only — this reference carries no verified squeeze band for dynamic (reciprocating or rotary) service, so none is shown. Groove width, corner radius, diametral clearance and back-up ring dimensions are outside the verified dataset and must come from the seal manufacturer's design chart.

AS568 O-Ring Sizes Closest to AS568-453

Ordered by how close the inside diameter is, across every cross-section series. A near-ID match in a different cross-section will not seal the same gland.

AS568 o-ring sizes with an inside diameter closest to AS568-453
Property	Inside Ø		Property	Property	Property
Size	in	mm	Cross-section, in	Outside Ø, in	ID difference, mm
AS568-381	11.9750	304.170	0.2100	12.3950	+0.000
AS568-278	11.9840	304.390	0.1390	12.2620	+0.220
AS568-277	11.4840	291.690	0.1390	11.7620	-12.480
AS568-380	11.4750	291.470	0.2100	11.8950	-12.700
AS568-452	11.4750	291.470	0.2750	12.0250	-12.700
AS568-454	12.4750	316.870	0.2750	13.0250	+12.700

Check the cross-section before substituting: the gland depth is set by cross-section, not by inside diameter.

Sources and Method for the AS568-453 O-Ring Size

Size and tolerancescomputed+compiled

bd_warehouse o-ring_parameters.csv (Apache-2.0) and bckasper3/KasperCalc oring-sizes.js (MIT), agreeing on all 349 sizes; OD computed as ID + 2 x CS

Verified against two independent open datasets agreeing on all 349 sizes; fabricated-dataset negative control passed; 21 checks total

Part computed from the standard's formulas, part compiled from agreeing public sources.

Gland designcomputed

MIL-G-5514G (public domain) gland design criteria; squeeze-percentage bands cross-read from Parker O-Ring Handbook ORD-5700 Design Charts 4-2/4-3 (verification only); depth = CS - CS x squeeze%

Verified against computed depth band brackets the published design-chart band for every series

Computed from the standard's formulas, then checked against published tables.

Formula

Outside diameter

OD  =  ID + 2 × CS

  11.9750 + 2 × 0.2750  =  12.5250 in

Gland depth from squeeze

depth  =  CS − (CS × squeeze%)

Squeeze percentage bands are the MIL-G-5514G static criteria; the depth column is that percentage applied to the nominal cross-section.

Assumptions

Dimensions are free-state, at room temperature, before installation.
Tolerances are AS568 manufacturing limits. Compression set, swell in service fluid and thermal expansion all move the installed dimensions and are properties of the compound, not of the size.
Gland figures are for static service only. MIL-G-5514G is inactive for new design and is used here as a public-domain source for the static squeeze bands.
Dataset scope: A fabricated-dataset negative control is asserted against on every run. EXCLUDED: groove width, corner radius, diametral clearance, back-up ring widths, surface finish, all dynamic glands, the 900-series, and ISO 3601 metric sizes.

Data last verified

August 1, 2026

How this data is built and checked →

How to Cite This AS568-453 O-Ring Reference

Citation

ShopMath. "AS568-453 O-Ring Size — ID, Cross-Section, OD and Gland Data." ShopMath, verified August 1, 2026, https://shopmath.org/o-rings/as568-453

BibTeX

@misc{shopmath-o-rings-as568-453,
  title        = {AS568-453 O-Ring Size — ID, Cross-Section, OD and Gland Data},
  author       = {{ShopMath}},
  year         = {2026},
  howpublished = {\url{https://shopmath.org/o-rings/as568-453}},
  note         = {Data verified 2026-08-01}
}

Permanent URL

https://shopmath.org/o-rings/as568-453

Common Questions About the AS568-453 O-Ring

What size is an AS568-453 o-ring?: An AS568-453 o-ring has an inside diameter of 11.9750 in (304.170 mm) and a cross-section of 0.2750 in (6.990 mm), giving an outside diameter of 12.5250 in (318.150 mm).
What is an AS568-453 o-ring in mm?: 304.170 mm inside diameter × 6.990 mm cross-section, 318.150 mm outside diameter. AS568 is an inch standard, so these are exact conversions rather than metric nominal sizes.
What is the tolerance on an AS568-453 o-ring?: AS568 allows ± 0.0598 in (± 1.520 mm) on the inside diameter and ± 0.0059 in (± 0.150 mm) on the cross-section, measured free-state.
What groove depth does an AS568-453 o-ring need?: For face seal, static service, a gland depth of 0.1953 to 0.2173 in (4.961 to 5.519 mm), which gives 21–29% squeeze on the 0.2750 in cross-section. Groove width and corner radius come from the seal manufacturer's chart.
Which AS568 series is the AS568-453 o-ring in?: Dash 453 is in the 425-475 band — AS568 1/4 in series, a 0.275 in cross-section. Every size in that band shares the same cross-section and therefore the same gland depth.

Complete AS568 size chart · Every AS568 series