Oil Seal Design and Customization

An oil seal closes the gap between a rotating shaft and its housing. It keeps lubricant in, keeps dirt, water and corrosive media out, and protects ball and roller bearings. Oil seals can have a single lip, a double lip (main lip plus dust lip) or a triple lip, depending on how much contamination they must keep out.

NIYOK oil seals are held to dimensional tolerances of 0.05 to 0.1 mm and produced under ISO 9001 and IATF 16949 processes. Drawing on our knowledge of how each rubber compound performs, we develop material combinations for specific industries and applications and recommend the best option for your project. Depending on the compound, the standard operating temperature range is -55°C to 250°C (specialty FKM compounds reach 275°C), with hardness from 30 to 90 Shore A, available to meet industrial, military, aftermarket and international standards. Materials include NBR, FKM, ACM, SBR and EPDM, plus compounds specified to your requirements. Our oil seal range includes fork dust seals, valve stem seals, power steering oil seals, brake caliper seals, transmission seals, compressor shaft seals and custom seals.

NIYOK recommends materials to suit each customer's needs and uses CAD/CAM to prepare drawings and samples for your approval, to the required tolerances and standards. When you send an oil seal inquiry, please include your drawings and operating conditions (fluid, temperature, pressure and shaft speed) so we can plan and advise from the start.

Application Industry

We have extensive experience across many industries, including manufacturing, chemical processing, defense, water treatment and filtration, hydraulics, fluid power, heavy trucks, automotive, aerospace, oil and gas, medical and life sciences, food and beverage, electronics and industrial controls, refineries, logistics, and supply chain and transportation.

NIYOK standard oil seal specifications

We not only supply high-quality standard components, but also focus on collaborative development with professional design expertise, delivering fully customized solutions tailored to your needs. With reliable lead times and rigorous quality control, we are committed to helping our customers enhance supply chain flexibility and product competitiveness.

How to Read NIYOK Oil Seal Type Codes

Each standard oil seal type in the chart above is named with two letters: the first gives the lip design and the second gives the outer case design. For example, TC is a spring-loaded main lip with a dust lip in a fully rubber-covered case, the most widely used type for gearboxes, pumps and motors.

Lip design: S = single lip with garter spring; T = spring-loaded main lip plus dust lip; V = single lip without spring; K = main lip without spring plus dust lip; D = two spring-loaded lips facing opposite directions, for separating two fluids.

Outer case: C = fully rubber-covered outer diameter, which seals well in housings with rougher bores; B = exposed metal outer diameter; A = metal outer diameter with an additional inner metal case for extra rigidity; M, Z and G = further case variants shown in the chart. Contact us for drawings and dimensions of any type.

Standard types: SC, TC, VC, KC, DC (C case); SB, TB, VB, KB, DB (B case); SA, TA, VA, KA, DA (A case); SM, TM, VM, KM, DM (M case); SZ, TZ, VZ, KZ, DZ (Z case); SG, TG, VG, KG, DG (G case).