Seagull Viton 75 O-Ring Imperial BS425V 4.475 x 0.275 in (113.67 x 6.99 mm)

Seagull Viton 75 imperial O-rings, BS400 series, in 51 sizes (BS425V to BS475V). Inside diameters run from 4.475 in (113.67 mm) to 25.940 in (658.88 mm), and the cross-section is 0.275 in (6.99 mm). Each ring is Viton (FKM), 75 hardness.

The model code is the BS 1806 size number with a V for Viton: for example BS450V is a 10.475 in (266.07 mm) inside diameter ring with a 0.275 in (6.99 mm) cross-section. The option list shows the nominal inside diameter as the nearest common fraction of an inch; the exact inside diameter is in the sizes table.

Where this product is used

• Hydraulic and pneumatic fittings, valves and cylinders
• Static sealing of covers, flanges, housings and fittings
• Fuel, oil and fluid systems where the system fluid or conditions call for Viton rather than NBR
• Pumps, compressors and process equipment
• General workshop maintenance and replacement of worn O-rings

Features

• Viton (FKM), 75 hardness: a fluoroelastomer compound chosen where NBR is not suited to the fluid or the operating conditions
• 51 imperial sizes in the BS400 series, BS425V to BS475V
• Inch and mm dimensions listed for every size, with the BS 1806 size number in the model code
• Nominal inside diameter shown in the option list, exact dimensions in the sizes table

Key specifications

Available sizes

Model codes are the Seagull size codes (BS 1806 size numbers with a V for Viton); the SKU is the part number.

Selecting the right option

O-rings are specified by inside diameter and cross-section. In this series the model code (BS425V to BS475V) is the BS 1806 size number, which fixes both dimensions, so if you know the BS number you can go straight to it in the options list.

If you only have the ring or the groove, measure the inside diameter and the cross-section of an unused ring and match them to the sizes table. A ring with the right inside diameter but the wrong cross-section will not seal correctly.

Viton (FKM) is chosen where NBR is not suited to the fluid or the operating conditions. It is not suited to every fluid, so check the compound against your fluid before ordering.

Fitting and use

Check the ring is the right size for the groove, keep it clean, and lubricate it lightly with a lubricant compatible with the compound before fitting.

Slide the ring over threads, keyways, splines and sharp edges using a sleeve, tape or a lead-in chamfer so it cannot be cut, and avoid twisting or rolling it into place.

Do not over-stretch the ring to fit, and replace O-rings when a joint is stripped down rather than reusing them.

Related products

Other Seagull Viton 75 imperial O-rings: Seagull Viton 75 O-Ring Imperial - BS000 Series, Seagull Viton 75 O-Ring Imperial - BS100 Series, Seagull Viton 75 O-Ring Imperial - BS200 Series and Seagull Viton 75 O-Ring Imperial - BS300 Series. Metric sizes: Seagull Viton 75 O-Ring Metric - 1 to 10.5 mm ID, Seagull Viton 75 O-Ring Metric - 11 to 20 mm ID, Seagull Viton 75 O-Ring Metric - 21 to 35.5 mm ID, Seagull Viton 75 O-Ring Metric - 36 to 50 mm ID, Seagull Viton 75 O-Ring Metric - 51 to 75 mm ID, Seagull Viton 75 O-Ring Metric - 76 to 100 mm ID and Seagull Viton 75 O-Ring Metric - 105 to 150 mm ID. See the full range in Oil Seals & O-Rings.