AS568 O-Ring Series

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We possess all the moulds for the AS568 O-ring size range, which lets us supply standard parts of the series promptly and without a tooling step. For a buyer that turns the size question into a non question and leaves only the compound and the quantity to settle. The size chart pages shown here are the same ones our own engineers work from.

Product Photographs

Every image on this page is a photograph of parts we have produced.

Key Benefits

• No tooling charge and no tooling lead time on any dash number in the series
• Sizes supplied promptly because the mould already exists rather than being scheduled
• Any of our twelve compounds available against a standard size
• One dash number identifies the part unambiguously between you and us
• Design freedom to standardise new hardware around a size that never needs tooling

Problems It Solves

• Paying for a mould on a size that a standard series already covers
• Lead times inflated by tooling that was never necessary
• Ambiguity when a seal is described by a measured diameter rather than by a dash number
• Suppliers who hold only part of the series and substitute for the rest

Who It Is For

• Design engineers fixing a groove design who want to avoid a permanent tooling cost
• Maintenance buyers ordering against an existing dash number
• Distributors stocking a standard seal programme
• OEMs standardising a seal schedule across several machines

Application Scenarios

• Machine tools and engineering machinery
• Agricultural machinery and construction machinery
• Instrumentation and chemical machinery
• Automobiles ships and aerospace equipment
• Mining machinery plastic machinery and petroleum machinery

What You Are Actually Buying

Only values our own records support appear here. Anything we cannot evidence is left out rather than estimated.

Standard	AS568 O-ring size series
Mould Coverage	Complete series held in house
Compounds Available	FKM, FFKM, SIR, EPDM, NBR, SBR, FVMQ, AEM/ACM, HNBR, CR, NR, CSM
Tooling Required	None for standard dash numbers
Also Known As	AS568 O-RING, AS568 O RING, AS568 ORING
Country of Manufacture	China

Materials

• FKM
• FFKM
• SIR silicone
• EPDM
• NBR
• SBR
• HNBR
• CR
• NR

Manufacturing Process

• Dash number confirmation
• Compound selection
• Moulding from existing AS568 tool
• Inspection
• Packing

Technical Features

• Complete AS568 mould set held in house rather than partially
• Dash number identifies both inside diameter and cross section family
• Available across the full compound range we mould
• Applications spanning virtually every branch of general machinery

Quality Control

• Dash number confirmed against the size chart before production
• Cross section checked on the moulded part rather than assumed from the tool
• Production checked against the approved first article
• Same tool used for repeat orders so sizes stay consistent

Customisation Options

• Any dash number in the series in any compound we mould
• Colour coding by compound for plant identification
• Mixed dash number schedules on a single order
• Non standard cross sections tooled separately when the design needs one

Where This Is the Right Choice and Where It Is Not

Compared With A custom tooled size

Where the groove is not yet fixed, designing around an AS568 dash number removes a tooling cost and a lead time permanently.

Compared With A supplier holding part of the series

Partial coverage means substitution on the sizes they lack. We hold the complete set.

Compared With Measuring the old seal

A measured inside diameter without the cross section is the most common source of a seal that fits and still leaks.

How to Specify and Order This Part

• Find the dash number on the size chart rather than ordering by measured diameter

Find the dash number on the size chart rather than ordering by measured diameter

• Measure both inside diameter and cross section thickness if the dash number is unknown

Measure both inside diameter and cross section thickness if the dash number is unknown

• Choose the compound against the medium and the temperature range

Choose the compound against the medium and the temperature range

• Where new hardware is being designed, pick a dash number before fixing the groove

Where new hardware is being designed, pick a dash number before fixing the groove

• Quote the dash number on every reorder to keep the part unambiguous

Quote the dash number on every reorder to keep the part unambiguous

Related Products

O-Rings

An O-ring is the cheapest part in most assemblies and the most common cause of a warranty return.

NBR O-Rings

NBR is the working compound for anything that meets oil or fuel at moderate temperature.

FKM and FFKM O-Rings

FKM and FFKM sit at the top of the seal material range and are frequently confused with each other.

O-Ring Moulds

An O-ring mould decides whether every ring coming off it is the same.

Related Guides and Industries

The AS568 O-Ring Size Standard and Why It Saves You Tooling

AS568 is the reason some O-ring quotations come back with no tooling charge and a short lead time, and others do not.

How to Choose a Rubber Seal Material in Six Questions

Six questions decide almost every seal material choice. Answer them before you ask for a price, and the quotation you get back will be worth comparing.

AS568 O-Ring Series Questions

Yes. We possess all the moulds for the AS568 O-ring size range, which is why we can supply standard parts of the series promptly.

Tell us the dash number and the compound. The size is not the constraint, though the compound and quantity may affect price and lead time.

A photo with the inside diameter and cross section thickness measured. We will identify the dash number from the chart.

No, not for standard dash numbers.

Yes. Mixed size and mixed compound schedules are normal for us.

Within one working day once we have the dash numbers, the compounds and the quantities.

Quote AS568 O-Ring Series

Send the size or drawing, the working conditions and the quantity. One working day for a considered reply.