V-rings

V-rings are rubber axial seals that are fitted onto the shaft and seal with their lip against a face surface. They protect bearings and shaft seals against dust, water and dirt and are often used as a pre-seal. We have more than 230 items in stock for shafts from 3 mm to 500 mm.

Profiles VA (the most common, with a tapered body), VS (with a wider body and greater stability) and VL (low profile for confined spaces). Materials NBR and FKM (Viton) for higher temperatures. The designation gives the profile and the shaft diameter – e.g. V-ring VA 30 NBR. Made by NAK, sizes to DIN 3760. V-rings in stock are shipped immediately, delivery within 1–2 days.

Frequently asked questions

How does a V-ring work and when should I use it?

A V-ring is stretched directly onto the shaft, rotates with it and its lip seals axially against a stationary counterface, for example a bearing housing cover. It mainly works as an excluder against dust, water spray and grease and protects the primary seal, i.e. the radial shaft seal. It tolerates misalignment, run-out and shaft vibration. In less demanding applications it can also seal on its own.

What is the difference between the VA, VS and VL profiles?

VA is the standard and most common profile, suitable for a wide range of shaft diameters. VS has a wider body, higher contact pressure and a firmer grip on the shaft, so it is chosen where VA does not hold firmly enough. VL is a slim compact profile for limited installation space. At SKF the VA, VS and VL profiles correspond to VR1, VR2 and VR3, at Trelleborg to Type A, S and L.

How do I choose the right V-ring size?

A V-ring is ordered by type, shaft diameter and material, for example VA 30 NBR. Each size covers a certain range of shaft diameters, and at the border between two sizes the larger one is chosen. We convert Trelleborg (TWVA…) or SKF (40xxxx) codes to type and shaft diameter. If you cannot find the size you need, send us the designation and we will check whether we can supply it.

Should I choose a V-ring in NBR or in FKM?

NBR is the standard material for general use, roughly from −40 to +100 °C. FKM (Viton) has a wider temperature range, roughly from −20 to +200 °C, and is more resistant to heat and chemicals. The material is stated in the product name after the profile and diameter. V-rings in stock are shipped immediately and delivery takes 1–2 days.