--- type: "o-ring" dash_number: "474" designation: "AS568-474" cs_series: "425-475" cs_series_name: "AS568 1/4 in series" id_in: 24.94 id_mm: 633.48 cs_in: 0.275 cs_mm: 6.99 od_in: 25.49 od_mm: 647.46 id_tol_in: 0.115 cs_tol_in: 0.0059 standard: "SAE AS568; MIL-G-5514G (public domain, inactive for new design)" verified: "August 1, 2026" url: https://shopmath.org/o-rings/as568-474 --- # AS568-474 O-Ring Size — ID, Cross-Section and OD An AS568-474 o-ring has an inside diameter of 24.9400 in (633.480 mm) and a 0.2750 in (6.990 mm) cross-section, for an outside diameter of 25.4900 in (647.460 mm). It belongs to the AS568 1/4 in series band. - **Dash number**: 474 - **Cross-section series**: AS568 1/4 in series - **Inside diameter**: 24.9400 in (633.480 mm) - **Cross-section**: 0.2750 in (6.990 mm) - **Outside diameter**: 25.4900 in (647.460 mm) - **Standard**: SAE AS568; MIL-G-5514G (public domain, inactive for new design) ## AS568-474 Dimensions and Tolerances | Dimension | Inch | Millimetre | | --- | --- | --- | | Inside diameter (ID) | 24.9400 | 633.480 | | Cross-section (CS) | 0.2750 | 6.990 | | Outside diameter (OD) | 25.4900 | 647.460 | | ID tolerance | ±0.1150 | ±2.920 | | CS tolerance | ±0.0059 | ±0.150 | _Outside diameter is computed as ID + 2 × CS; AS568 tabulates ID and CS._ ## Gland Design for AS568-474 Static gland dimensions for the 0.275 in cross-section. Depth is the groove depth that produces the stated squeeze on a nominal ring. | Application | Squeeze | Squeeze (in) | Gland depth (in) | Gland depth (mm) | | --- | --- | --- | --- | --- | | Static face seal | 21–29% | 0.0578 – 0.0798 | 0.1953 – 0.2173 | 4.961 – 5.519 | _Gland depth is computed as CS − (CS × squeeze %), then checked against the published design charts. Groove width, corner radius and back-up ring allowances are outside this dataset._ ## O-Ring Sizes Closest to AS568-474 Nearest AS568 sizes by inside diameter — the substitutes to check when this one is out of stock. | Size | ID (in) | ID (mm) | CS (in) | OD (in) | | --- | --- | --- | --- | --- | | [AS568-394](https://shopmath.org/o-rings/as568-394.md) | 24.9400 | 633.480 | 0.2100 | 25.3600 | | [AS568-393](https://shopmath.org/o-rings/as568-393.md) | 23.9400 | 608.080 | 0.2100 | 24.3600 | | [AS568-395](https://shopmath.org/o-rings/as568-395.md) | 25.9400 | 658.880 | 0.2100 | 26.3600 | | [AS568-473](https://shopmath.org/o-rings/as568-473.md) | 23.9400 | 608.080 | 0.2750 | 24.4900 | | [AS568-475](https://shopmath.org/o-rings/as568-475.md) | 25.9400 | 658.880 | 0.2750 | 26.4900 | | [AS568-392](https://shopmath.org/o-rings/as568-392.md) | 22.9400 | 582.680 | 0.2100 | 23.3600 | ## Sources and Method for AS568-474 ### AS568 dimensions - **Source**: 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 - **Method**: computed+compiled - **Verified against**: two independent open datasets agreeing on all 349 sizes; fabricated-dataset negative control passed; 21 checks total ### Gland design - **Source**: 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% - **Method**: computed - **Verified against**: computed depth band brackets the published design-chart band for every series ### Assumptions - Dimensions are for a nominal, unstretched ring at room temperature. Installed stretch reduces cross-section. - Gland figures are static-application only and assume a nominal ring; they carry no compound, temperature or pressure assumption. - 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 ## Common Questions About the AS568-474 O-Ring ### What size is an AS568-474 o-ring? AS568-474 has an inside diameter of 24.9400 in (633.480 mm) and a cross-section of 0.2750 in (6.990 mm), giving an outside diameter of 25.4900 in (647.460 mm). ### What is the o-ring size tolerance on AS568-474? The AS568 tolerance on AS568-474 is ±0.1150 in (±2.920 mm) on the inside diameter and ±0.0059 in (±0.150 mm) on the cross-section. ### What groove depth does an AS568-474 o-ring need? For a static face seal, an 0.275 in cross-section needs a gland depth of 0.1953 to 0.2173 in (4.961 to 5.519 mm), which puts the ring at 21–29% squeeze. ### What o-ring is closest in size to AS568-474? The nearest AS568 sizes by inside diameter are AS568-394 (24.9400 in ID), AS568-393 (23.9400 in ID), AS568-395 (25.9400 in ID). ## Related pages - Previous dash number: [AS568-473](https://shopmath.org/o-rings/as568-473.md) — 23.9400 in ID - Next dash number: [AS568-475](https://shopmath.org/o-rings/as568-475.md) — 25.9400 in ID - All o-ring sizes: [AS568 o-ring reference](https://shopmath.org/o-rings.md) - Full size chart: [AS568 o-ring size chart](https://shopmath.org/charts/o-ring-sizes.md) --- *Source: [ShopMath](https://shopmath.org/o-rings/as568-474) — data verified August 1, 2026. Reference data; verify against the governing standard before manufacture.*