Margo Rubber Products
Precision moulded rubber O-rings

ISO 9001:2015 Certified · Nashik, India

Precision O-Rings,
Manufactured in India

Margo Rubber Products moulds O-rings to AS568, ISO 3601, JIS B2401 and DIN 3771 at its ISO 9001:2015 certified plant in Nashik, India — catalogue sizes or cut to print, in AEM, FKM, NBR, EPDM and silicone. Tolerance follows the standard and the section.

View O-Ring Size Chart
AS568 · ISO · JIS · DIN
Standards
±0.08 to ±0.15 mm
Cross-section tolerance, per standard
AEM · FKM · NBR · EPDM · VMQ
Compounds
48 hrs
Quotation Turnaround

Which O-ring standards and compounds does Margo mould?

Margo moulds O-rings to AS568, ISO 3601, JIS B2401 and DIN 3771, in AEM, EPDM, FKM, NBR and silicone. Hardness runs from 30 to 90 Shore A depending on the compound, and tolerance follows the standard and the cross-section. Sizes outside the catalogue are cut to your drawing. The minimum run is 10,000 pieces per part number, per compound.

02 · SPECIFICATION REFERENCE

O-Ring Sizes, Tolerances and Compounds

All dimensions in mm. Shore A ranges are the standard options we mould in each compound. Custom durometers and non-catalogue internal diameters are quoted against your drawing.

AS568-0010.74±0.081.02±0.0850–8060–9040–9040–9030–80
AS568-0106.07±0.081.78±0.0850–8060–9040–9040–9030–80
AS568-1021.24±0.082.62±0.0850–8060–9040–9040–9030–80
AS568-21018.64±0.103.53±0.1050–8060–9040–9040–9030–80
AS568-32537.47±0.135.33±0.1350–8060–9040–9040–9030–80
AS568-437151.77±0.156.99±0.1550–8060–9040–9040–9030–80
DIN 3771 12×212.00±0.132.00±0.0850–8060–9040–9040–9030–80
DIN 3771 50×550.00±0.305.00±0.1350–8060–9040–9040–9030–80
JIS B2401 P109.80±0.141.90±0.0750–8060–9040–9040–9030–80
JIS B2401 P2221.80±0.192.40±0.0750–8060–9040–9040–9030–80
JIS B2401 G4544.40±0.323.10±0.0950–8060–9040–9040–9030–80
JIS B2401 G9089.40±0.633.10±0.0950–8060–9040–9040–9030–80

Showing 12 of 12 · AS568 is dimensionally equivalent to ISO 3601-1 Series A; DIN 3771 harmonised into Series B · Non-catalogue sizes quoted against your drawing Typical values. See our technical disclaimer.

03 · MATERIAL SELECTION

Which O-Ring Material Do I Need?

Each compound has a distinct chemical compatibility profile and temperature ceiling. Name the medium, the operating temperature and the pressure class, and we will tell you which to specify.

AEM
Temp. Range
−40° to +175°C continuous to 160°C
Hardness
50–80 Shore A

Ethylene acrylic elastomer. Holds compression-set stability where oil, heat and ozone act together.

FKM
Temp. Range
−20° to +250°C continuous to 200°C
Hardness
60–90 Shore A

Fluorocarbon rubber, the first choice for aggressive chemical environments. Resists petroleum oils, fuels and many solvents at sustained high temperature.

NBR
Temp. Range
−30° to +120°C
Hardness
40–90 Shore A

Nitrile butadiene rubber, the general-purpose industry standard. Outstanding resistance to petroleum oils and hydraulic fluids at moderate temperature.

EPDM
Temp. Range
−40° to +140°C
Hardness
40–90 Shore A

Ethylene propylene diene rubber, the preferred material for water, steam and brake fluid service, with excellent weather and ozone resistance. Not for petroleum oils.

VMQ
Temp. Range
−60° to +220°C
Hardness
30–80 Shore A

Vinyl methyl silicone, the widest service range of the eight. Biocompatible grades available. Poor abrasion resistance — not a wear part.

CR
Temp. Range
−40° to +120°C
Hardness
40–90 Shore A

Polychloroprene. Balanced properties across weather, refrigerants and moderate oil exposure, and the family we reach for when flame retardancy is specified.

SBR
Temp. Range
−30° to +100°C
Hardness
40–90 Shore A

Styrene butadiene rubber. Abrasion resistance at low cost, for static seals in water and mild service. Not for oil or fuel contact.

NR
Temp. Range
−20° to +90°C
Hardness
30–80 Shore A

Polyisoprene. The highest resilience of the eight, specified where a seal also has to damp. Not for oil, fuel or sustained heat.

PTFE
Temp. Range
−60° to +205°C
Hardness
85–95 Shore A

A PTFE jacket over an FKM or silicone core — the chemical resistance of PTFE with the recovery of an elastomer. Specified where a compound would be attacked but a rigid seal cannot follow the groove.

Viton is a registered trade mark of The Chemours Company. Vamac is a registered trade mark of DuPont. Teflon is a registered trade mark of The Chemours Company.

IN THIS CATEGORY

O-Rings We Make to Order

Each part below is manufactured to customer drawing or to our standard tooling. Compound, hardness and dimensions are set from your specification, and full dimensional data is issued with the quotation.

O-Rings made by Margo Rubber Products
  1. Static face O-ring in black rubber with a round cross-section, lying flat

    01

    Static Face O-Rings

    O-Rings · Made to order

  2. Static radial O-ring in black rubber with a round cross-section, shown standing upright

    02

    Static Radial O-Rings

    O-Rings · Made to order

  3. Dynamic reciprocating O-ring in black rubber with a round cross-section, shown standing upright

    03

    Dynamic Reciprocating O-Rings

    O-Rings · Made to order

  4. Dynamic rotary O-ring in brown FKM rubber with a round cross-section

    04

    Dynamic Rotary O-Rings

    O-Rings · Made to order

  5. Vacuum service O-ring in black rubber with a thin round cross-section

    05

    Vacuum Service O-Rings

    O-Rings · Made to order

  6. Back-up ring in white PTFE with a rectangular cross-section and a single split cut for easy fitting

    06

    Back-Up Rings

    O-Rings · Made to order

  7. AS568 standard O-rings in black rubber, five sizes arranged in a row from smallest to largest

    07

    AS568 Standard O-Rings

    O-Rings · Made to order

  8. JIS B2401 standard O-rings in black rubber, four sizes nested concentrically

    08

    JIS B2401 Standard O-Rings

    O-Rings · Made to order

  9. DIN 3771 standard O-rings in black rubber, three sizes with round cross-sections

    09

    DIN 3771 Standard O-Rings

    O-Rings · Made to order

  10. Non-catalogue O-ring in black rubber with an unusually thick round cross-section relative to its inner diameter

    10

    Non-Catalogue O-Rings

    O-Rings · Made to order

  11. Large diameter O-ring in black rubber with a thin round cross-section

    11

    Large Diameter O-Rings

    O-Rings · Made to order

  12. Square section ring in black rubber with a split showing the square cross-section

    12

    Square Section Rings

    O-Rings · Made to order

  13. Rectangular section ring in black rubber, an endless ring with a flat rectangular cross-section

    13

    Rectangular Section Rings

    O-Rings · Made to order

  14. X-ring profile in black rubber, a coiled length with a cut end showing the four-lobed X-shaped cross-section

    14

    X-Rings & Quad Rings

    O-Rings · Made to order

  15. O-ring cord in black rubber, a coil of solid round cord with three cut lengths showing the solid cross-section

    15

    O-Ring Cord

    O-Rings · Made to order

  16. Vulcanised joined O-ring in black rubber with the spliced joint visible at the front

    16

    Vulcanised Joined O-Rings

    O-Rings · Made to order

  17. PTFE-encapsulated O-ring with a translucent fluoropolymer jacket showing the grey elastomer core inside

    17

    PTFE-Encapsulated O-Rings

    O-Rings · Made to order

  18. Colour-coded O-rings in black, brown, red, green and blue rubber, five rings overlapping

    18

    Colour-Coded O-Rings

    O-Rings · Made to order

  19. Oil filler cap O-ring in black rubber with a round cross-section, viewed from above

    19

    Oil Filler Cap O-Rings

    O-Rings · Made to order

  20. Transmission O-ring in green rubber with a round cross-section

    20

    Transmission O-Rings

    O-Rings · Made to order

  21. Under-bonnet O-rings in black rubber, an assortment of twelve sizes

    21

    Under-Bonnet O-Rings

    O-Rings · Made to order

  22. Switchgear O-rings in black, red and brown rubber, an assortment of nine sizes

    22

    Switchgear O-Rings

    O-Rings · Made to order

  23. Pump and valve seals in black rubber: three O-rings, two lip seals and a stack of V-ring chevron packing

    23

    Pump & Valve O-Rings

    O-Rings · Made to order

04 · MANUFACTURING STANDARDS

What Sizing Standards Does Margo Manufacture To?

Margo manufactures O-rings to AS568, ISO 3601, JIS B2401 and DIN 3771, covering the four major global catalogues used in fluid power, aerospace, automotive and industrial sealing specifications. Non-catalogue and cut-to-print O-rings are manufactured from approved drawings.

AS568

Aerospace Size Standard

United States, defined by SAE International. The dominant standard for North American fluid power and aerospace procurement.

ISO 3601

International Metric Standard

Global metric catalogue in three parts covering dimensions (Part 1), tolerances (Part 2) and quality acceptance (Part 3).

JIS B2401

Japanese Industrial Standard

Japanese metric series in P, G, V and S size groups, commonly required by Japanese OEM supply chains.

DIN 3771

German Industrial Standard

DIN metric catalogue, harmonised into ISO 3601 but still actively called out on German mechanical engineering drawings.

Send the standard reference or the drawing. If your print calls out a series we have not tooled, we cut the tool here.

05 · COMMERCIAL TERMS

Lead Times and How We Quote

Margo produces in bulk against OEM schedules. Tell us the part and the volume and we will quote it. Minimum run is 10,000 pieces per part number, per compound, or quoted against the part where size or complexity sets the economics. Prototype and first-article lots sit outside the minimum and are quoted separately.

Quotation

With feasibility report

48 hrs

Prototype

From an approved drawing

48–72 hrs

Catalogue sizes

Ex-works Nashik, from drawing approval · 2 weeks express

3–4 weeks

Cut-to-print

Tooling lead time quoted per part

3–4 weeks + tooling

Packaging

Bulk reel or blister on request

Poly bag + card label

Guides

Further Reading

  • O-Ring Size Chart: AS568, ISO 3601-1 and BS 1806 Explained

    Cross-references the international sizing standards with tolerance and groove-dimension guidance. ISO 3601-1 is the current standard and its size code matches the AS568 dash number; BS 1806 was superseded by BS ISO 3601 but is still widely quoted, so a working chart has to carry all three.

  • FKM vs NBR: Which Rubber Is Right for Your Application?

    Compares fluorocarbon and nitrile across temperature, chemical resistance and cost-in-use — FKM −20 to +250 °C, NBR −30 to +120 °C. FKM is the answer where temperature or aggressive media demand it; NBR is the answer everywhere else, and it costs a fraction as much.

06 · ENQUIRIES

Send a Drawing or a Standard Reference

Send your drawing, standard reference and compound requirement. We reply within one business day, and a quotation with dimensional confirmation and material data follows inside 48 hours.

Send EnquiryCall Technical Sales