OR-FKM80-420x5-RB57315

O-ring 420×5 FKM 80 Shore A

This FKM (Viton) O-ring is a premium fluorocarbon rubber with excellent resistance to high temperatures, aggressive media and fuels.

SKU: OR-FKM80-420x5-RB57315
Article number: 57315
Dimensions: 420 × 5 mm
Material: FKM · 80 Sh A

excl. VAT

From €23.90

€29.40 incl. VAT

On demandExternal supplier

Minimum order is €5.00 excl. VAT. Below that you pay the difference as a top-up — add more pieces and you'll avoid it.

Available to order — approx. 5 days

Add 9 more pieces — from 10 pcs the price is €21.51 per piece, ex. VAT.

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FKM O-ring 420 × 5 mm (inner diameter 420 mm, cross-section 5 mm). Outer diameter 430 mm. Hardness 80 Sh A. Temperature range -20 °C to 200 °C. Standard ISO3601-420x5.

Inner diameter (ID): 420 mm
Cross-section (CS): 5 mm
Outer diameter (OD): 430 mm
Dimensions: 420x5
Material: FKM
Hardness: 80 Sh A
Colour: brown
Temperature range: -20 °C to 200 °C
Standard code: ISO3601-420x5
ISO 3601 size: 420x5
SKU: OR-FKM80-420x5-RB57315
Country of origin: Germany
Availability: On demand

Technical specifications

Product data
Material	FKM
Hardness (Shore A)	80 Sh A
Color	brown
Certifications	No specific certifications
Indicative values for FKM
Temperature range	-20 °C to 200 °C
Tensile strength	13 MPa
Ultimate elongation	180 %
Compression set	18 %
Specific gravity	1.85 g/cm³

These values apply to the FKM material family as a whole, not to this specific size and hardness. Always verify suitability for your specific application before use.

Cross-standard size references

Standard code: ISO3601-420x5
ISO 3601: 420x5
DIN 3771: 420x5

Material properties

Fluorocarbon rubber (FKM), known by the trade name Viton, is a premium elastomer for high-temperature and chemically demanding applications. It offers very good resistance to mineral oils, aromatic hydrocarbons, fuels including biodiesel, mineral acids, hot oils, ozone and oxygen. Operating temperature range is -20 °C to +200 °C, short-term up to +230 °C. It is an OEM standard for automotive engine seals. Not suitable for amines, ketones, esters, glycol-based brake fluids, hot water and steam.

Material: FKM
Chemical name: Fluorocarbon Rubber
Material grade: Viton, FPM, Tecnoflon
Trade names: DuPont Viton, Solvay Tecnoflon, Daikin Dai-el

Suitable for various industries

FKM O-rings are used in engine systems, turbochargers, fuel injectors, chemical industry, oil & gas industry and aerospace. Typical applications include biodiesel fuel distribution seals, EGR systems, high-temperature hydraulic press cylinder seals, and chemical pumps.

Application notes

Premium choice for engine systems, biodiesel fuel distribution and chemical industry. Avoid glycol-based brake fluid and ketones. In dynamic applications monitor compression set at temperatures above +150 °C.

Advantages

High thermal resistance up to +200 °C (short-term +230 °C)
Resistant to fuels, mineral oils and aromatic hydrocarbons
Resistant to ozone, oxygen and UV radiation
Low compression set at elevated temperatures
OEM standard for automotive engine seals

Price tiers

When buying	per piece
from 1 pcs	€23.90
from 10 pcs −10%	€21.51
from 100 pcs −25%	€17.92
from 1000 pcs −35%	€15.53

Prices exclude VAT. The volume discount is applied automatically in the cart.

Documentation

Download datasheet (PDF)

See all materials in size 420 × 5 mm

Frequently asked questions about this O-ring

What is the temperature range of a FKM O-ring?

This FKM O-ring is rated for continuous service of roughly -20 to 200 °C. The material tolerates brief temperature peaks higher, but near the limits service life drops significantly. If you operate at the edge of the range, ask our technician about a more suitable compound.

What media is FKM resistant to?

FKM (Viton®/FFKM type) resists aggressive chemicals, fuels, oils, and high temperatures — the choice for the chemical industry and hot environments. Watch out for hot steam and glycol-based brake fluids, where EPDM is more suitable. For a specific medium, check compatibility in our chemical-resistance chart.

What do the dimensions of this O-ring mean?

The size 420 × 5 mm gives the inner diameter × cross section. The inner diameter must fit the groove or rod; the cross section sets the seal thickness. When replacing, do not confuse inner diameter with outer diameter. If you search by standard (AS568, ISO 3601, JIS), use our cross-reference finder.

What does 80 Shore A hardness mean?

A hardness of 80 Shore A expresses the stiffness of the rubber: a lower number (50–60) is softer and seals an uneven surface better, a higher one (80–90) better resists pressure and extrusion from the groove. For most common applications the optimum is around 70 Shore A. Under high pressure, choose a harder material and possibly a back-up ring.

Read the FKM material guide