What is the minimum order quantity (MOQ)?

Stock models can be supplied in small quantities, and non-standard bearings can be custom-made even in small batches. Send us the model number or drawing and we will confirm the MOQ with your quotation.

Can you supply bearings under our own brand?

Yes. NKEN offers full OEM service: your brand laser-marked on the bearing rings, custom colour boxes and labels, so the goods arrive ready for your shelf.

Do you provide free samples?

Yes, free samples are available for most catalogue models so you can test quality and fit before placing a bulk order.

What information do you need to quote?

The bearing model number (or the brand cross-reference number you currently buy), quantity, delivery destination, and any special requirements such as clearance, seals or branding. A drawing is enough for non-standard parts.

Which countries do you export to?

NKEN bearings are exported to more than 73 countries, with sea and air shipping options and export packing as standard.

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Stack of electrically insulated bearings with white ceramic-coated outer rings and brass cages, for VFD motor shaft-current protection

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Electrically Insulated Bearings — VL0241 & J20 Cross Reference

NKEN is a specialist manufacturer and supplier of electrically insulated bearings for variable-frequency (VFD) motors, traction motors, wind-power generators and rail applications. A plasma-sprayed ceramic coating on the outer or inner ring — 50–200 μm thick — breaks the electrical circuit through the bearing and withstands voltages up to 1000 V, stopping fluting, pitting and premature grease failure caused by shaft currents.

Our insulated range covers deep groove ball, cylindrical roller, tapered roller, spherical roller and angular contact types, built on the same GCr15 steel, dimensions and load ratings as the standard bearing — so an insulated NKEN bearing is a drop-in replacement for the VL0241 / VL2071 / VA3091 and J20AA / J20AB / J20B / J20C designation classes you already buy. Send us the designation on your current bearing and we will quote the NKEN equivalent.

Ceramic insulation coating 50–200 μm, dielectric strength up to 1000 V
Drop-in equivalents for VL0241, VL2071, VA3091 and J20AA, J20AB, J20B, J20C designations
Five bearing types insulated: deep groove ball, cylindrical, tapered, spherical and angular contact roller/ball
Same dimensions and load ratings as the standard bearing — no housing or shaft changes
Popular motor sizes held in stock for fast dispatch; free samples for testing

Insulation coating	Ceramic (aluminium oxide), plasma-sprayed, 50–200 μm
Breakdown voltage	Up to 1000 V DC
Coating position	Outer ring or inner ring, per designation
Base bearing	GCr15 steel, precision P0–P2, standard internal clearance unless specified
Cross-reference designation classes	VL0241 · VL2071 · VA3091 · J20AA · J20AB · J20B · J20C

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Electrically Insulated Bearings — models, dimensions & cross-reference

Bearing type	Typical models	Coating	VL class	J20 class
Deep groove ball, outer-ring coated	6208, 6209, 6210, 6212, 6308, 6309, 6310, 6312, 6316	Outer ring, 50–200 μm	VL0241	J20AA / J20AB
Deep groove ball, inner-ring coated	6209, 6210, 6212, 6310, 6312, 6314	Inner ring, 50–200 μm	VL2071	J20B
Cylindrical roller, insulated	NU 208, NU 210, NU 212, NU 309, NU 310, NU 312	Outer or inner ring	VL2071	J20B / J20C
Traction motor bearings	Per motor drawing	Per specification	VA3091	J20 class
Tapered / spherical / angular contact	Per model — send designation	Per specification	VL class	J20 class

Full insulated-bearing stock list available on request — tell us your current insulated designation (VL / J20 class) and the quantity, and we confirm the NKEN equivalent, coating position and delivery time.

Applications

Electric Motors & VFD Wind Power Railway & Traction

Electrically Insulated Bearings — questions buyers ask

What is the NKEN equivalent of a 6312 VL0241 bearing?

Our insulated 6312 with outer-ring ceramic coating is a dimensional drop-in for the 6312 VL0241 you are replacing: same 60 × 130 × 31 mm envelope, coating 50–200 μm, insulation rated to 1000 V. Send the full designation and quantity for a quotation.

J20AA or J20B — which coating position do I need?

J20AA/J20AB designations refer to an insulated outer ring; J20B to an insulated inner ring. If you are unsure, tell us the motor and the bearing position — we match the coating position of the bearing you are replacing.

Can insulated bearings be supplied in small quantities?

Yes. Stock motor sizes can be supplied in small quantities and free samples are available for insulation and fit testing before a bulk order.

Get a quote for Electrically Insulated Bearings

Tell us the model and quantity — we reply with price, stock status and delivery time. Free samples available for most models. Prefer to talk? WhatsApp James Ke at +86 188 9536 7568 (24/7 support).