NSK6320DDUC3Deep Groove Ball Bearing 100x215x47 mm Contact Rubber Seals Both Sides C3 Clearance

Product Description

What this part is

An NSK 6320DDUC3 single-row deep groove ball bearing, 100 x 215 x 47 mm, with a contact rubber seal on each face and C3 radial internal clearance.

Decoding the designation

6320 — single-row deep groove ball bearing, 63 heavy series, 100 mm bore.
DDU — contact rubber seals, one on each face.
C3 — radial internal clearance greater than normal.

What these specs mean in practice

A deep groove ball bearing takes radial load and moderate thrust in either direction, and the 63 heavy series carries substantially more of both than a 62-series bearing on the same 100 mm shaft. Contact seals rub on the inner ring land, so they hold grease in and dirt and water out far better than a shield, at the cost of some drag and a lower speed ceiling than the open or shielded version. C3 clearance leaves extra room in the bearing when cold; that room is what absorbs the loss of clearance caused by an interference fit on the shaft and by the inner ring running hotter than the outer, which is why C3 is the usual choice for electric motors, fans and anything with a heavy press fit or a warm running temperature.

Published ratings and mounting data

Bore: 100 mm (3.937 in)
Outside diameter: 215 mm (8.465 in)
Width: 47 mm (1.850 in)
Rows: 1
Dynamic load rating (Cr): 173 kN
Static load rating (C0r): 141 kN
Internal clearance: C3
Closure: contact rubber seals both faces
Cage: pressed sheet steel
Rolling elements: balls
Lubricant: grease, factory filled
Operating temperature: −20 °C to 120 °C
Precision class: ABEC 1 (P0, normal)

Quantity and configuration

Sale unit is 1 Pc, one complete sealed bearing, grease filled from the factory.

Fitting notes

The bearing mounts with an interference fit on the ring that rotates and a looser fit on the ring that stays still, which for a rotating shaft means a press fit on the inner ring. Fitting force goes through the ring being pressed, not across the balls, and heating the inner ring is the cleaner route on a 100 mm bore. Sealed bearings arrive lubricated for life and are not relubricated in service.

Interchange guidance

ISO base 6320 with contact seals both sides and C3 clearance. Direct equivalents include SKF 6320-2RS1/C3, FAG 6320-2RSR-C3 and Koyo 6320-2RSC3. Shielded versions — 6320ZZ, 6320-2Z — are related sizes and not interchanges, since a shield does not seal against liquid. The open 6320 and the normal-clearance 6320DDU are likewise different parts.