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Drawing of 638 2RS: ⌀8 × ⌀28 × 9 mm638 2RS2RS
Fig. 1: 638 2RS, end view and section; internal parts simplified per ISO 8826-1. Dimensions in mm

There is no photo of this product: the drawing shows the dimensions of 638 2RS

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

Bearing CT 638 2RS

€0.42per piece
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Specifications

Manufacturer number
ISO designation
Equivalents
1 exact, 0 approximate
d
8 mm
Bore diameter dBearing bore = shaft diameter. Source: two supplier sources
D
28 mm
Outside diameter DOutside diameter = housing bore. Source: two supplier sources
B
9 mm
Width BRing width. Source: two supplier sources
Seal
2RSrubber, both sides
Clearance
normal clearance
C
4.62 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
1.96 kN
Basic static load rating C0Permissible load without rotation and under shock; ISO 76 method, manufacturer’s figure. Source: supplier data
m
0.03 kg
MassWeight of the product. Source: supplier data
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Equivalents

the same size 8 × 28 × 9 from other brands

3 products
Series illustration (not a photo of this item): 638 2RS
You are viewingCT 638 2RS
€0.42baseline for the price comparison

Not enough data for a firm conclusion: what is missing is written in the row.

  • Series illustration (not a photo of this item): 638 2RS638 2RSdimensions in the data are incompleteno brand? × ? × ?available to orderon requestRequest a quote
  • Series illustration (not a photo of this item): 638 2RS638 2RSdimensions in the data are incompleteZEN? × ? × ?available to orderon requestRequest a quote

Under the price: the difference from the price of this bearing (€0.42).
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Details

what this bearing is, questions

About the bearing

D 28d 8B 9
d×D×Bsize 8 × 28 × 9mm
Cdynamic 4.62kN
C0static 1.96kN
mweight 0.03kg

Deep groove ball bearing 638-2RS, design 2RS: contact seals on both sides.

C, C₀, m: CT 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.

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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