FKM O-ring

O-Ring 3.65 × 1.78 mm · FKM · 90A

  • ID3.65 mm0.144 in
  • CS1.78 mm0.070 in
  • MaterialFKM
  • Hardness90 Shore A

OXXRING SKU OXX-OR-3P65-1P78-FKM-90A-P10

O-Ring 3.65 × 1.78 mm · FKM · 90A
Representative image. Colour can differ by compound.
ID 3.65 mm CS 1.78 mm SECTION
Nominal dimensions. Drawing is proportional, not to scale.

Same size, other grades

Compare every grade at this size →
Available to order
$8.19for 10 pcs

$0.82 per piece

1 pack × 10 pcs = 10 pieces · $8.19

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  • Price is the total for the pack. Taxes and shipping are calculated at checkout.

Need 1,000+ or a different spec? Bulk quote

Standard items: returns per our Refund Policy. Custom items are made to order.

Specifications

Inside diameter (ID)3.65 mm · 0.144 in
Cross section (CS)1.78 mm · 0.070 in
Material familyFKM
Hardness90 Shore A
OXXRING SKUOXX-OR-3P65-1P78-FKM-90A-P10
OrderingBuy online
Check chemical compatibility for FKM Check this size in a groove

Check this size for your application

Free engineering tools, already filled in with 3.65 × 1.78 mm FKM.

Engineer ProRod, piston, face or dynamic seal: squeeze, extrusion and pressure for this exact ring Material selectorMedia, temperature and pressure to the right family Size cross-referenceThis size in AS568, JIS and BS terms CalculatorsWeight, cord length and stretch

Same size, other materials and hardness

Identical nominal ID × CS. Material and hardness change suitability; check the fluid and temperature before switching.

SizeMaterialSize referenceSmallest packOrderingAction
3.65 × 1.78 mm0.144 × 0.070 in NBR 90A — $27.17 / 1000 pcs $0.027 / pc Available to order Choose pack
3.65 × 1.78 mm0.144 × 0.070 in EPDM 70A — $4.99 / 10 pcs $0.50 / pc Available to order Choose pack
3.65 × 1.78 mm0.144 × 0.070 in Silicone 70A — $4.99 / 10 pcs $0.50 / pc Available to order Choose pack
3.65 × 1.78 mm0.144 × 0.070 in FFKM 80A — $105.23 / 7 pcs $15.03 / pc Available to order Choose pack

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 3.65 × 1.78 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.