AS568 standard size, dash -002
AS568-002 O-ring: 0.042 in ID x 0.050 in cross-section
AS568-002 is the AS568 dash 002 O-ring size. It has a 0.042 in (1.07 mm) inside diameter and a 0.050 in (1.27 mm) cross-section, which gives a 0.142 in (3.61 mm) outside diameter as a reference. AS568 controls the inside diameter and the cross-section; the outside diameter is derived.
- Inside diameter
- 0.042 in1.07 mm, +/- 0.004 in
- Cross-section
- 0.050 in1.27 mm, +/- 0.003 in
- Outside diameter
- 0.142 in3.61 mm, reference
- Series
- 0xx0.050 in nominal cord
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Specifications
| Dimension | Value | Tolerance |
|---|---|---|
| Inside diameter (ID) | 0.042 in 1.07 mm | +/- 0.004 in |
| Cross-section (W) | 0.050 in 1.27 mm | +/- 0.003 in |
| Outside diameter (reference) | 0.142 in 3.61 mm | derived: ID + 2 x W |
| Standard | AS568 (SAE Aerospace Standard) | inch authoritative |
Millimeter values are converted. Groove dimensions and squeeze follow the gland standard your drawing names (SAE AS4716, AS5857 or ISO 3601-2), and material engineering follows the compound sheet.
Source for the dimensions and tolerances on this page and the nearby sizes: Parker® O-Ring Handbook ORD 5700, 2021 printing, section IX, AS568 size tables, pages 9-2 to 9-11, read 2026-09-27. Inch values are authoritative and millimeters are converted at 25.4.
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Gland design
Groove guidance for a 0.050 in cross-section
Groove guidance for this cross-section is not published here; the groove design guide and your drawing govern.
Compounds for an AS568-002 O-ring
| Family | Standard range | Typical media |
|---|---|---|
| Viton® (FKM) | -26 C to 204 C | fuels, oils, heat |
| Buna-N (NBR) | -34 C to 100 C | mineral oils, hydraulic fluid |
| EPDM (EPDM) | -57 C to 150 C | water, steam, glycol; never petroleum oils |
| Silicone (VMQ) | -54 C to 204 C | dry heat and cold, static service |
| FFKM (FFKM) | -26 C to 320 C | aggressive chemistry and temperature beyond FKM (FFKM vs FKM) |
| HNBR (HNBR) | -32 C to 149 C | oil with heat |
| Fluorosilicone (FVMQ) | -73 C to 177 C | fuels at low temperature |
| Polyurethane (AU/EU) | -40 C to 82 C | abrasion and high pressure |
| Aflas® (FEPM) | -9 C to 232 C | steam, amines, sour gas |
| Butyl (IIR) | -59 C to 121 C | gas impermeability, brake fluid and phosphate esters; never oil |
| Polyacrylate (ACM) | -21 C to 177 C | hot transmission oil; poor at low temperature and in water |
| Ethylene-acrylic (AEM) | -40 C to 149 C | hot automotive oil |
| SBR (SBR) | -46 C to 100 C | the compound sheet governs |
| Natural rubber (NR) | -50 C to 70 C | the compound sheet governs |
| Epichlorohydrin (ECO) | -40 C to 135 C | the compound sheet governs |
The compound sheet sets the limit for a specific grade. The butyl, polyacrylate and ethylene-acrylic ranges are the handbook's section 2.2 figures (Parker ORD 5700, read 2026-09-14); the SBR and natural rubber (both dry heat) and epichlorohydrin ranges are Apple Rubber's printed standard-compound figures (Apple Rubber Seal Design Guide, read 2026-09-27). Name the compound your drawing calls out and we quote AS568-002 in it.
Viton® is a trademark of The Chemours Company; Aflas® is a trademark of AGC; Parker® is a trademark of Parker Hannifin Corporation. No affiliation or endorsement is implied.
Frequently asked
What are the dimensions of an AS568-002 O-ring?
AS568-002 has a 0.042 in (1.07 mm) inside diameter with a 0.050 in (1.27 mm) cross-section, which gives a 0.142 in (3.61 mm) outside diameter as a reference. AS568 controls the inside diameter and the cross-section; the outside diameter is derived.
What tolerance applies to AS568-002?
The inside diameter carries plus or minus 0.004 in (0.10 mm) and the cross-section plus or minus 0.003 in (0.08 mm). Both come from the AS568 table for this dash number.
Which compounds is AS568-002 available in?
The compound your drawing or specification calls out. The families below show published ranges; the compound sheet sets the limit. Send the compound and we quote the size in it.
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Need AS568-002 in a specific compound or quantity?
Send the part number, the material and the quantity. A Conquest representative reads every request and replies within one business day.
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