O-Rings – BS1806 / ISO 3601 Standard & Custom-Moulded

O-Rings – BS1806 / ISO 3601 Standard & Custom-Moulded

Kaybin supplies and manufactures industrial rubber O-rings for BS1806 and ISO 3601 standard glands, as well as custom-moulded O-rings to drawing, OEM reference or sample. O-rings are specified to suit media, temperature, pressure and groove design to minimise leakage, extrusion and long-term compression set in industrial and OEM equipment.

This page covers circular rubber O-rings only – not flat gaskets, mechanical seals or complete seal kits.

Function & Typical Applications

Function:

• Provides radial or axial sealing between mating components
• Maintains sealing squeeze under pressure
• Controls leakage in static and limited dynamic duty
• Works with back-up rings where extrusion gaps increase

Typical Applications:

• Hydraulic and pneumatic manifolds and cylinders
• Pumps, valves, gearboxes and motor housings
• Flanged joints, inspection covers and service plugs
• OEM builds and maintenance replacement of BS / ISO sizes

Correctly selected O-rings reduce leakage, limit downtime and protect surrounding components from fluid loss or contamination.

Material Options

O-rings are supplied in application-specific elastomers:

• NBR (Nitrile) – mineral oils, fuels and general hydraulic duty
• EPDM – hot water, steam (within limits) and cleaning chemicals (not mineral oils)
• FKM / Viton® – elevated temperatures and aggressive fluids
• Neoprene (CR) – weathering and moderate oil resistance
• Silicone (VMQ) – wide temperature range and selected hygienic uses
• Additional compounds available on request

Compound and hardness (Shore A) are selected based on sealing force, compression-set resistance, chemical compatibility and operating environment.

Sizing & Standards

• BS1806 and ISO 3601 standard size ranges supported
• Metric and imperial cross-sections
• Matching of existing O-rings from sample or OEM code
• Custom-moulded O-rings where no standard size or compound is suitable

Best practice is to confirm O-ring selection against groove / gland dimensions rather than nominal size alone.

Operating Conditions

Designed for:

• Static sealing applications
• Reciprocating and slow rotary motion within elastomer limits
• Low to higher pressures (hardware-dependent)
• Oil, air, water and selected chemical media (compound-dependent)

Specification focuses on controlling extrusion, spiral failure, swelling and compression set through correct material and groove fit.

Quick 30-Second Spec Guide

To identify the correct O-ring:

• Standard size (BS / ISO) or measured ID and cross-section
• Application type (static, reciprocating, slow rotary)
• Media (oil, water, air, chemicals)
• Pressure and temperature range
• Groove / gland dimensions if available

A drawing, photo or sample can significantly speed up confirmation.

Engineering Details Required

For precise specification, provide:

• ID and cross-section (or BS / ISO code)
• Motion type and duty cycle
• Working and peak pressure
• Temperature range
• Media and contamination exposure
• Groove / gland dimensions and hardware material (if known)
• Quantity and urgency

Kaybin then confirms compound, hardness and dimensional suitability and supplies standard or custom-moulded O-rings for reliable sealing performance in industrial equipment across South Africa and Africa.