Custom Size NBR Buna-N O-Rings Molded to AS568 and ISO 3601 Metric Spec

Custom Size NBR Buna-N O-Rings Molded to AS568 and Metric Spec

Custom-molded NBR (Buna-N) O-rings produced to AS568 dash sizes, ISO 3601 metric specs, and non-standard dimensions outside those series. Send a drawing or a sample and we mold to your gland — useful for obsolete sizes, prototypes, and special-seal replacements.

Capabilities

• Mold to AS568 dash sizes and ISO 3601 metric dimensions
• Non-standard cross-sections and diameters from drawing or sample
• FDA, low-temperature, and colored NBR compounds available
• Reverse-engineer from a worn or obsolete seal

Applications

Replacement of discontinued O-rings, hydraulic and pneumatic custom glands, prototype builds, and field repairs where standard dash sizes do not fit.

FAQ

Q: What do you need to make a custom O-ring?
A: A drawing with ID, OD, cross-section, and tolerance — or a physical sample to copy. Also tell us material/hardness (usually 70 or 90 Shore A NBR) and quantity.

Q: Can you match AS568 and metric sizes exactly?
A: Yes. We mold to AS568 dash sizes and ISO 3601 metric specs, and we also produce dimensions outside those series when the gland calls for it.

Q: What is the minimum order quantity?
A: MOQ depends on whether tooling already exists. Sizes we already tool can run in smaller batches; a fully new tool carries a setup we quote per inquiry.

Q: What tolerances can you hold?
A: We work to AS568 and ISO 3601 tolerance classes as standard, with tighter grades available on request for critical glands.

Q: How long does a custom order take?
A: Stock AS568 and metric sizes ship quickly. Custom-molded parts run from sample approval plus production time — we confirm the schedule after reviewing your drawing.

Q: Is NBR the right material for my fluid?
A: NBR suits mineral oil, hydraulic fluid, fuel, water, and glycol. It is not for H2S, ozone, ketones, or long-term aromatic hydrocarbons — for those, see our HNBR, FKM, or EPDM lines.