MPN

RS PRO FKM O-Ring O-Ring, 42mm Bore, 50mm Outer Diameter

RS Stock No.:: 255-6489
Brand:: RS PRO

RS PRO FKM O-Ring O-Ring, 42mm Bore, 50mm Outer Diameter

Subtotal (1 bag of 2 units)*

£5.56

(exc. VAT)

£6.67

(inc. VAT)

FREE delivery for orders over £50.00

In Stock

12 unit(s) ready to ship
Plus 15 unit(s) ready to ship from another location
Plus 999,999,987 unit(s) shipping from 30 October 2025

Need more? Click ‘Check delivery dates’ to find extra stock and lead times.

Bag(s)	Per Bag	Per unit*
1 +	£5.56	£2.78

*price indicative

RS Stock No.:: 255-6489
Brand:: RS PRO

RS PRO Metric FKM 75 ShA O-Rings

Introducing the range of RS PRO FKM O-Rings, ideal for use as seals for pumps, drive belts, and other general engineering applications in the hydraulic and pneumatic industry. This O-ring is manufactured from FKM, which is a premium material and is popular within the aircraft, automotive and chemical industries. With a variety of metric and imperial sizes available to suit a wide range of applications, the O-ring also offers long life and excellent chemical resistance to most hydrocarbons, oils and fuels to aid optimum performance for the life of the O-ring.

Features and Benefits:

This range of RS PRO O-rings are versatile seals that can be used as shaft seals, face to face seals, as well as facilitating rotary and linear movement

The FKM material is hardwearing with excellent resistance to chemicals and provides optimum performance and a long-lasting seal life

Operating temperature range: -15°C to 200°C

Ideal for use as seals for pumps, drive belts, and other general engineering applications in the hydraulic and pneumatic industry

Available in a wide range of metric and imperial sizes

Applications:

An O-ring is a type of round or donut-shaped seal and is most commonly used to stop fluids or air passing through into another area. O-rings are normally seated between two sections and when compressed, they form a secure seal that prevents particle, vapour and fluid leakage which in turn protects and maintains pressure whilst keeping debris out, ensuring proper function and safety. They come in different sizes and materials, depending on the application they are used for, so it is important to consider what materials and fluids are going to be in contact with the seal to ensure it is the right one. These seals or gaskets are most commonly used in:

Industrial and manufacturing applications

Plumbing

Hydraulics and pneumatics

Automotive manufacturing and repair

Power transmission technology

How long does an O-Ring last for?

If the O-ring is used in the correct conditions for the material, FKM O-rings can last indefinitely

Why RS PRO?

RS PRO is our own brand range and brings you a wide range of high-quality, great value products offering you more choice. Trusted by engineers all over the world, every part of every RS PRO product has been rigorously tested against demanding industry standards. They’re only given the RS PRO seal of approval if we’re confident of their exceptional quality, which means you can be confident too.

Note:

These Nitrile O-rings are not compatible with:

Ozone

Esters

Retones

Aldehydes

Chlorinates

Nitro Hydrocarbons

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Select all	Attribute	Value
	Brand	RS PRO
	Type	O-Ring
	Material	FKM
	Inside Diameter	42mm
	Outside Diameter	50mm
	Thickness	4mm
	Minimum Operating Temperature	-15°C
	Maximum Operating Temperature	+200°C

	Select all
	Brand RS PRO
	Type O-Ring
	Material FKM
	Inside Diameter 42mm
	Outside Diameter 50mm
	Thickness 4mm
	Minimum Operating Temperature -15°C
	Maximum Operating Temperature +200°C