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, squeeze and material engineering follow the gland guidance below and the compound sheet.
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 |
| 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) | no range on file | the compound sheet governs |
| Natural rubber (NR) | no range on file | the compound sheet governs |
| Epichlorohydrin (ECO) | no range on file | 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); SBR, natural rubber and epichlorohydrin have no range on file. 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.
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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