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Drawing of 6304 2RS: ⌀20 × ⌀52 × 15 mm6304 2RS2RS
Fig. 1: 6304 2RS, end view and section; rolling element geometry per the NSK catalogue. Dimensions in mm
Bearing NSK 6304 2RS — photo 1
Load: radial medium; axial low, on both sidesDeep groove ball

Bearing NSK 6304 2RS

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Specifications

Manufacturer number
ISO designation
GOST number
Equivalents
13 exact, 37 approximate
d
20 mm
Bore diameter dBearing bore = shaft diameter. Source: two supplier sources
D
52 mm
Outside diameter DOutside diameter = housing bore. Source: two supplier sources
B
15 mm
Width BRing width. Source: two supplier sources
Seal
2RSrubber, both sides
Clearance
normal clearance
C
15.9 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
7.9 kN
Basic static load rating C0Permissible load without rotation and under shock; ISO 76 method, manufacturer’s figure. Source: supplier data
m
0.14 kg
MassWeight of the product. Source: two supplier sources
01

Equivalents

the same size 20 × 52 × 15 from other brands

55 products
Photo: 6304 2RS
You are viewingNSK 6304 2RS

Everything the number specifies matches: series 63, 20 × 52 × 15 mm, contact seals on both sides, normal clearance, ordinary steel, design without special letters. The codes in the number are read against the NSK catalogue.
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Details

what this bearing is, questions

About the bearing

D 52d 20B 15
d×D×Bsize 20 × 52 × 15mm
Cdynamic 15.9kN
C0static 7.9kN
mweight 0.14kg

Deep groove ball bearing 6304-2RS, design 2RS: contact seals on both sides. Under GOST the same bearing is designated 180304.

C, C₀, m: NSK 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 180304?

It is the same bearing under GOST 3189-89: 18 — contact seals on both sides, 0304 corresponds to the ISO base 6304. Size 20 × 52 × 15 mm, a full equivalent of 6304-2RS.

Will 6304 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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