391.00 × 3.50 mm (15.394 × 0.138 in) FKM O-ring
O-ring size reference in mm and inch
FKM O-ring product detail for 391.00 × 3.50 mm (15.394 × 0.138 in)
O-ring measurement guide in mm and inch
    391.00 × 3.50 mm (15.394 × 0.138 in) FKM O-ring
    O-ring size reference in mm and inch
    FKM O-ring product detail for 391.00 × 3.50 mm (15.394 × 0.138 in)
    O-ring measurement guide in mm and inch
391.00 × 3.50 mm (15.394 × 0.138 in) FKM O-ring
O-ring size reference in mm and inch
FKM O-ring product detail for 391.00 × 3.50 mm (15.394 × 0.138 in)
O-ring measurement guide in mm and inch
391.00 × 3.50 mm (15.394 × 0.138 in) FKM O-ring
O-ring size reference in mm and inch
FKM O-ring product detail for 391.00 × 3.50 mm (15.394 × 0.138 in)
O-ring measurement guide in mm and inch
    391.00 × 3.50 mm (15.394 × 0.138 in) FKM O-ring
    O-ring size reference in mm and inch
    FKM O-ring product detail for 391.00 × 3.50 mm (15.394 × 0.138 in)
    O-ring measurement guide in mm and inch
391.00 × 3.50 mm (15.394 × 0.138 in) FKM O-ring
O-ring size reference in mm and inch
FKM O-ring product detail for 391.00 × 3.50 mm (15.394 × 0.138 in)
O-ring measurement guide in mm and inch

O-Ring 391.00 × 3.50 mm · FKM · 75A


391.00 × 3.50 mmFKM75A

Buy O-Ring 391.00 × 3.50 mm · FKM · 75A in ready-to-ship pack sizes for repair, maintenance, prototype work, and small-batch purchasing.

  • Material: FKM
  • Hardness: 75 ShA
  • Size: 391.00 × 3.50 mm (15.394 × 0.138 in)
  • Pack options: 10 / 20 / 50 / 100 / 250 / 500 pcs
  • Use case: chemical- and heat-resistant sealing for more demanding environments
  • Standard reference: AS568 / international metric-style, where applicable.

Pricing note: This size/material combination uses an adjusted direct-buy price for higher complexity or sourcing risk.

For 1000+ pcs, special requirements, or custom dimensions, use Custom by Size or Drawing.

$36.48
$36.48
/ pack
10 / 20 / 50 / 100 / 250 / 500 pcs available
Unit reference updates after pack selection
Shipping calculated at checkout.
Pack Size:
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Need 1000+ pcs or a custom size?

Better pricing for volume orders

Custom by Size or Drawing
Need Help?
Custom by Size or Drawing MOQ 1000 pcs support@oxxring.com


Quick Specifications

Inner Diameter (ID)391.00 mm
Cross Section (CS)3.50 mm
MaterialFKM
Hardness75A
Pack Options10 / 20 / 50 / 100 / 250 / 500 pcs
Custom MOQ1000+ pcs
Available for small-pack order

Not sure about the size?

Measure ID and CS

Match the Inner Diameter (ID) and Cross Section (CS) to your old O-ring before ordering.

Then choose the pack size that fits your needs.

View Size Guide How to Measure

Is FKM right for your needs?

FKM is a strong option for higher temperatures, chemicals, and fuel exposure where standard rubber is not enough.

Good for

  • Fuel & aggressive fluids
  • High temperature sealing
  • Chemical resistance

Not recommended for

  • Low-temperature flexibility
  • Hot water / steam service

Common Applications

Fuel systemsChemical handlingHigh-heat equipmentIndustrial maintenance

Need 1000+ pcs or a custom size?

Custom by size or drawing available. Better pricing for volume orders.

Custom by Size or Drawing