Seagull Double Lip Viton Oil Seal 1/2 x 1-1/8 x 1/4" (500-1125-250TCV)

Seagull imperial double lip oil seals, widths from 1/4 in to 1/2 in, in 25 sizes. Shaft diameters run from 1/2 to 3-1/2 in and housing bores from 1-1/8 to 4-1/2 in, and each size is a rotary shaft seal in Viton (FKM).

Each size carries a model code that gives the shaft diameter, housing bore and width in thousandths of an inch, followed by the type: for example 1250-2000-375TCV is a 1-1/4 in shaft, 2 in housing bore and 3/8 in wide seal, type TCV. The V on the end of the code marks the Viton version.

Where this product is used

• Gearboxes, speed reducers and differentials, sealing input and output shafts
• Electric motors, pumps, compressors and fans where a rotating shaft leaves a housing
• Wheel hubs, axles and drive shafts on vehicles, trailers and agricultural machinery
• Equipment running hot or in contact with aggressive oils and chemicals, where a Viton seal is specified over NBR

Features

• Double lip (TC): a second lip on the outer side helps keep dust and dirt away from the main sealing lip
• Viton (FKM) sealing material for higher temperatures and more aggressive fluids than NBR
• Every size has a model code that spells out the shaft, bore and width, so it can be matched to the marking on the old seal

Key specifications

Available sizes

Model codes are the Seagull size codes; the SKU is the part number.

Selecting the right option

Choose the size from the options list. The first number is the shaft diameter and the second is the housing bore, both in inches. Width varies by size and is part of the option and model code, so check it before ordering.

Match the shaft diameter, the housing bore and the width. Go by the shaft and bore rather than the lip of the old seal, as the lip sits slightly smaller than the shaft it seals on. Width is usually the least critical of the three, provided the housing has the depth.

Type TC is the double lip version, with a second lip on the outer side that helps keep dust and dirt off the main lip; type SC is single lip, suited to cleaner conditions.

NBR suits mineral oils and greases in general machinery. Viton is chosen where the seal runs hot or meets aggressive fluids, and this page is the Viton version of the range.

For a size not shown, request a quote with the shaft diameter, housing bore and width.

Fitting and use

Fit the seal with the main lip facing the fluid you are keeping in, press it in square using a tool that bears on the outer face of the seal, and avoid hammering directly on the seal.

Lubricate the lip with the system oil or grease before assembly, and cover keyways, splines, threads or sharp shoulders with a sleeve or tape so they cannot cut the lip as it passes over.

Run the seal on a clean, smooth shaft with a lead-in chamfer and no burrs. A shaft finished to ISO h11 is the usual guide for rotary shaft seals.

Related products

Other Seagull imperial oil seals: Seagull Oil Seal Double Lip Imperial - Width 1/4", Seagull Oil Seal Single Lip Imperial - Width 1/4", Seagull Oil Seal Imperial (Double and Single Lip) - Width 3/8", Seagull Oil Seal Single Lip Imperial - Width 3/8" and Seagull Oil Seal Single Lip Imperial - Width 1/2". See also the full range in Oil Seals & O-Rings.