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Drawing of 6308 2RS //RO: ⌀40 × ⌀90 × 23 mm6308 2RS //RO2RS
Fig. 1: 6308 2RS //RO, end view and section; rolling element geometry per the NSK catalogue. Dimensions in mm

There is no photo of this product: the drawing shows the dimensions of 6308 2RS //RO

Load: radial medium; axial low, on both sidesDeep groove ball

Bearing Koyo 6308 2RS //RO

€11.81per piece
In stock: 15 pcs
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Specifications

Manufacturer number
ISO designation
GOST number
Equivalents
14 exact, 65 approximate
d
40 mm
Bore diameter dBearing bore = shaft diameter. Source: supplier data
D
90 mm
Outside diameter DOutside diameter = housing bore. Source: supplier data
B
23 mm
Width BRing width. Source: supplier data
Seal
2RSrubber, both sides
Clearance
normal clearance
C
50.9 kN
Basic dynamic load rating CLoad for one million revolutions at 90 % reliability; the L10 life is calculated from it as (C/P)^p. ISO method, manufacturer’s figure: do not carry it over to another brand. Source: supplier data
C0
24 kN
Basic static load rating C0Permissible load without rotation and under shock; ISO 76 method, manufacturer’s figure. Source: supplier data
m
0.633 kg
MassWeight of the product. Source: supplier data
01

Equivalents

the same size 40 × 90 × 23 from other brands

82 products
Series illustration (not a photo of this item): 6308 2RS //RO
You are viewingKoyo 6308 2RS //RO
€11.81baseline for the price comparison

Everything the number specifies matches: series 63, 40 × 90 × 23 mm, contact seals on both sides, normal clearance, ordinary steel, design without special letters. The codes in the number are read against the Koyo catalogue.

Under the price: the difference from the price of this bearing (€11.81).
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Details

what this bearing is, questions

About the bearing

D 90d 40B 23
d×D×Bsize 40 × 90 × 23mm
Cdynamic 50.9kN
C0static 24kN
mweight 0.633kg

Deep groove ball bearing 6308-2RS, design 2RS: contact seals on both sides. Under GOST the same bearing is designated 180308.

C, C₀, m: Koyo data. Another brand publishes its own figures, so compare them against that brand’s catalogue.

Frequently asked questions

How does 2RS differ from ZZ?

2RS has rubber seals that touch the inner ring and keep out dust and water better, which is the usual choice for field machinery. ZZ has metal shields that do not touch, allow higher speeds, and protect against dirt less well.

What is 180308?

It is the same bearing under GOST 3189-89: 18 — contact seals on both sides, 0308 corresponds to the ISO base 6308. Size 40 × 90 × 23 mm, a full equivalent of 6308-2RS.

Will 6308 2RS C3 fit instead?

Same size, clearance greater than normal. C3 is used where the bearing runs hot or sits on the shaft with an interference fit. If the old bearing is not marked C3, take this one.

Can I fit another brand instead of this bearing?

Without checking, only an exact equivalent: the size, seal, clearance and design match according to the brand’s catalogue. Positions with the same geometry differ in seal, clearance or design, and each one says so in the equivalents block. Load ratings differ between manufacturers, so for a heavily loaded unit compare C.

How do I get a price and a lead time?

Press “Request a quote” and send the part number and quantity. We reply with the price, availability and delivery terms for your country.

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