Core Product Line
O-Rings
FITCO's principal product line: O-rings manufactured across every major sizing standard and all core elastomer compounds, from single-cavity prototype tooling to high-volume production.
NBR O-rings across a range of AS568 and metric sizes.
Compression-molded O-rings ready for inspection.
Sizing standards
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O-Ring Standard
AS568 O-Rings
AS568 (Aerospace Size Standard 568) defines the inch-based dash-numbered O-ring sizes used as the de-facto glo…
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Metric O-Rings
Metric O-rings are specified by inside diameter and cross-section in millimetres and are the default on Europe…
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O-Ring Standard
ISO 3601 O-Rings
ISO 3601-1 defines metric O-ring dimensions and tolerance classes (Class A/B) and ISO 3601-2 defines gland dim…
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Custom O-Rings
Where a standard AS568, metric or ISO 3601 size does not fit the application, FITCO produces custom O-rings to…
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Browse by material
Material
NBR (Nitrile / Buna-N)
NBR is the workhorse elastomer of the sealing industry — a copolymer of butadiene and acrylonitrile whose acry…
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FKM / FPM (Fluoroelastomer)
FKM (often referenced by the trade name Viton) is a fluorine-containing elastomer built for aggressive chemica…
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EPDM
EPDM's saturated backbone gives outstanding resistance to ozone ageing, UV and weathering along with strong pe…
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Silicone (VMQ)
Silicone offers the widest usable temperature range of any common elastomer and is available in FDA- and USP C…
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HNBR (Hydrogenated Nitrile)
Hydrogenating the NBR backbone removes most of the residual unsaturation, substantially improving heat, ozone …
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FFKM (Perfluoroelastomer)
FFKM replaces essentially all hydrogen with fluorine, approaching PTFE-level chemical inertness while retainin…
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Browse by industry
Industry
Oil & Gas
Downhole tools, wellheads, valves, BOPs and surface production equipment demand seals engineered for explosive…
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Industry
Automotive
Fuel systems, transmissions, engine cooling, braking and turbocharger seals are supplied to tight dimensional …
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Industry
Food & Beverage
Processing, filling and CIP/SIP-cleaned equipment require FDA, EU 1935/2004 and USP Class VI compliant compoun…
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Industry
Pharmaceutical
Bioprocessing, dosing and cleanroom equipment call for low-extractable, USP Class VI and ISO 10993-compliant e…
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Industry
Chemical Processing
Reactors, pumps, valves and piping in continuous contact with acids, solvents and process chemicals require co…
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