O-ring selection

O-rings

We carry an extensive range of o-rings (30 million plus) at our four units in Market Harborough, in the most common materials:
Nitrile (Buna / NBR) • Fluoroelastomer (FPM / FKM / Fluorocarbon / Viton®) • Silicone ( VMQ ) • Fluorosilicone (FVMQ ) • EPDM • Chloroprene / Neoprene® • PTFE • Polyurethane ( PU) • PTFE Encapulated Silicone and Viton® (FEP).
Additionally we can supply High Nitrile, HNBR, Aflas®, Butyl, Natural Rubber, Hypalon and many others – most in a range of colours and Shore Hardnesses. For those more demanding situations, we can also offer a range of Perfluroelastomers / FFKMs – including Kalrez®, Chemraz®, Isolast® and Perlast® amongst others. We are able to offer fully moulded non standard o-rings up to 700mm ID with a full range of cross sections in many materials, hardnesses and colours – without tooling costs and high production runs to tight lead times. For static applications with non standard sizes we can also offer Scarf Jointed and Vulcanised rings as cost effective alternatives to moulded rings.

For more information on O-ring materials, see O-ring Materials

For more information on compatibility, see fluid compatibility chart

O-ring Cord
Supplied as an endless extruded cord with an O-ring cordo-ring profile. O-ring cord can be used for cord rings (cold bond joined or vulcanised) which can then be fitted as static seals e.g. large o-rings, where standard sizes are unavailable, or for sealing flanges and container lids etc. It can be supplied in the following standard materials:
Nitrile • FPM(alternative to Viton ® Du Pont & Dow Elastomers) • Silicone • EPDM • Neoprene • FEP encapsulated

For more information on o-ring cord, see cord tolerances

Backup rings

back-up ringsBackup Rings are available in the following standard styles and materials:

The advantages of using Parbak are:
  1. 1. They are moulded in a one piece contoured design which improves performance by enabling the O-ring to keep it's shape under high pressure.
  2. 2. Can be stretched easily into place.
  3. 3. Parbaks do not cause the localised wear on o-rings, which is the characteristic of other types of backup ring.

O-ring kit boxes

O-ring kit boxes
Cross section diameter gauges moulded into the o-ring kit box itself, are accurately calibrated cross section slots. These slots assure precision measurement of o-rings to be replaced.
BOXH Metric o-rings
NBR70°  Shore A 30 sizes=404 pcs
Numbers Sizes Quantity Numbers Sizes Quantity
On Kit ID Section InKit On Kit ID Section In Kit
R-01 3 2 18 R-16 20 3 12
R-02 4 2 18 R-17 22 3 12
R-03 5 2 18 R-18 24 3 12
R-04 6 2 18 R-19 25 3 12
R-05 7 2 17 R-20 27 3 12
R-06 8 2 17 R-21 28 3 12
R-07 10 2 17 R-22 30 3 12
R-08 10 2.5 14 R-23 32 3 12
R-09 11 2.5 14 R-24 33 3 12
R-10 12 2.5 14 R-25 35 3 12
R-11 14 2.5 14 R-26 36 3 12
R-12 16 2.5 14 R-27 38 3 12
R-13 17 2.5 14 R-28 38 4 9
R-14 19 2.5 14 R-29 42 4 9
R-15 19 3 12   R-30 45 4 9

 

BOXG Imperial o-rings
NBR 70°   Shore A 30 sizes= 382 pcs
As 568A Actual size Quantity As 5118A Actual size Quantity
Dash No. ID Section In Kit Dash No. ID Section lnKlt
006 2.90 1.78 20 211 20.22 3.53 10
007 3.68 1.78 20 212 21.82 3.53 10
008 4.48 1.78 20 213 23.40 3.53 10
009 5.28 1.78 20 214 24.99 3.53 10
010 6.07 1.78 20 215 26.58 3.53 10
011 7.66 1.78 20 216 28.17 3.53 10
012 9.25 1.78 20 217 29.75 3.53 10
110 9.19 2.62 13 218 31.34 3.53 10
111 10.8 2.62 13 219 32.92 3.53 10
112 12.31 2.62 13 220 34.52 3.53 10
113 13.95 2.62 13 221 36.10 3.53 10
114 15.54 2.62 13 222 37.69 3.53 10
115 17.13 2.62 13 325 37.47 5.33 7
116 18.72 2.62 13 326 40.65 5.33 7
210 18.84 3.53 10   327 43.82 5.33 7

We also offer o-ring kits in Nitrile 90shore and FPM 75shore

O-ring splicing kitO-ring Tools

Splicing Kit

HOW TO MAKE AN O-RING

To calculate the correct length of cord required, multiply the inside diameter of the o-ring by pi, then add 1x cord diameter. This will then give the correct length of cord required. Using the splicing aid and a very sharp knife, make a cut in the material at a right angle. All surfaces to be glued must be free of oil or grease. Avoid touching the surfaces. A thin layer of glue should be spread over one side of the cut. A thin layer provides the best results. In order to join the two sides cleanly, use the V section on the splicing aid. Match both surfaces together and press firmly for 15 seconds. The glue must dry for 60 seconds before mounting the O-ring.

Kits available: Kit S (11) and Kit SL (16)

Contents List SPLICING KIT 11 size Contents List SPLICING KIT 16 size
  • 2M C0178 1/16 nom
  • C0262 3/32 nom
  • C0350 1/8 nom
  • C0533 3/16 nom
  • C0699 1/4 nom
  • 2M CO160 1.6mm
  • C0200 2.0mm
  • C0300 3.0mm
  • C0400 4.0mm
  • C0500 5.0mm
  • C0570 5.7mm
  • TOOL BOX
  • KNIFE
  • LF600 (5g glue)
  • BLOCK
  •  
  •  
  •  
  •  
  •  
  • 2M C0178 1/16 nom
  • C0262 3/32 nom
  • C0350 1/8 nom
  • C0533 3/16 nom
  • C0699 1/4 nom
  • 2M CO160 1.6mm
  • C0200 2.0mm
  • C0300 3.0mm
  • C0400 4.0mm
  • C0500 5.0mm
  • C0570 5.7mm
  • 2m CO150 1.5mm
  • C0240 2.4mm
  • C0250 2.5mm
  • C0350 3.5mm
  • C0840 8.4mm
  • TOOL BOX
  • KNIFE
  • LF600 (5g glue)
  • BLOCK
O-ring gauge.
National O-ring Gauge With this handy gadget, it's easy to determine the size of almost any British Standard size O-ring. Section size is identified by using the slots at the top. The BS size number of small O-rings can be found by matching them with the silhouettes along the sides of the gauge.
Larger O-rings are placed around the two halves of the appropriate spindles at the top of gauge. The slide is then extended until it is taut, and the BS size number is shown in one of the small windows near the top of the main body.

Digital Caliper
Digital Caliper This is the ideal tool for acurately measuring O-Ring sizes.
Features include:

PI TapeExternal Measuring Jaws • Internal Measuring Jaws • Depth Blade • Step Measuring Faces • Beam • Sae & Metric Scale • Battery Compartment • Output Connector • LCD Display • Slider Clamp Screw • Thumb Roller • On/Off Switch • Zero Switch • Sae & Metric • Conversion Switch

PI Tape This heavy duty plastic coated tape enables accurate measurement of inside diameters from 50 to 500mm.

Call Now!+44 (0)1858 434141: To order and for assistance call NOW