FKM O-ring · AS568-243 size reference
O-Ring 104.37 × 3.53 mm · FKM · 80A
- ID104.37 mm4.109 in
- CS3.53 mm0.139 in
- MaterialFKM
- Hardness80 Shore A
OXXRING SKU OXX-OR-104P37-3P53-FKM-80A-P10
Same size, other grades
Compare every grade at this size →$3.95 per piece
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Standard items: returns per our Refund Policy. Custom items are made to order.
Specifications
| Inside diameter (ID) | 104.37 mm · 4.109 in |
|---|---|
| Cross section (CS) | 3.53 mm · 0.139 in |
| Material family | FKM |
| Hardness | 80 Shore A |
| Size reference | AS568-243, BS1806-243 |
| OXXRING SKU | OXX-OR-104P37-3P53-FKM-80A-P10 |
| Ordering | Buy online |
Check this size for your application
Free engineering tools, already filled in with 104.37 × 3.53 mm FKM.
Same size, other materials and hardness
Identical nominal ID × CS. Material and hardness change suitability; check the fluid and temperature before switching.
| Size | Material | Size reference | Smallest pack | Ordering | Action |
|---|---|---|---|---|---|
| 104.37 × 3.53 mm4.109 × 0.139 in | NBR 70A | AS568-243 | $36.22 / 100 pcs $0.36 / pc | Available to order | Choose pack |
| 104.37 × 3.53 mm4.109 × 0.139 in | EPDM 70A | AS568-243 | $6.85 / 10 pcs $0.69 / pc | Available to order | Choose pack |
| 104.37 × 3.53 mm4.109 × 0.139 in | Silicone 70A | AS568-243 | $39.46 / 20 pcs $1.97 / pc | Available to order | Choose pack |
| 104.37 × 3.53 mm4.109 × 0.139 in | FFKM 80A | AS568-243 | $175.10 / pc $175.10 / pc | Available to order | Choose pack |
Nearby listed sizes
For comparison only. A nearby size is not an equivalent; confirm the gland dimensions or ask for a review before substituting.
FKM material notes
Usually a good starting point for
Mineral oils, hydraulic fluids, gasoline, many hydrocarbons, ozone/weathering and selected vacuum-service conditions.
Review before use with
Review steam, glycol brake fluid, alkalis, amines/ammonia, organic acids and demanding dynamic service.
Family-level screening, not an approval of a specific compound. Screen a chemical or ask for a material check.
Questions about this O-ring
How do I confirm this is the right size?
Measure the inside diameter and the cross section of the ring you are replacing, or read them from the drawing. This listing is 104.37 × 3.53 mm. For a used ring, measure in several places; wear and swelling change the dimensions. Measurement guide
How is the price calculated?
The price shown is the total for one pack. The per-piece price is shown beside it for comparison. Choose how many packs you need; taxes and shipping are calculated at checkout.
Can I order a quantity that is not in the pack list?
Yes. Order several packs, or request a quote for larger or scheduled quantities.
Is the size reference a certification?
No. A size reference such as AS568 or ISO 3601 describes nominal dimensions. It does not certify the compound or approve the part for a specific application.