KG
Drawing of 6311 2RS: ⌀55 × ⌀120 × 29 mm6311 2RS2RS
Fig. 1: 6311 2RS, 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 6311 2RS

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

Bearing KG 6311 2RS

Price on request
Available to order

Specifications

Manufacturer number
ISO designation
GOST number
d
55 mm
Bore diameter dBearing bore = shaft diameter. Source: supplier data
D
120 mm
Outside diameter DOutside diameter = housing bore. Source: supplier data
B
29 mm
Width BRing width. Source: supplier data
Seal
2RSrubber, both sides
Clearance
normal clearance
C
74.1 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
45 kN
Basic static load rating C0Permissible load without rotation and under shock; ISO 76 method, manufacturer’s figure. Source: supplier data
Limiting speed
8,000 rpm
Limiting speedMechanical limit; depends on the seal (SKF 6200: 36,000 open, 17,000 with 2RSH). Source: supplier data
m
1.35 kg
MassWeight of the product. Source: supplier data
01

Equivalents

the same size 55 × 120 × 29 from other brands

44 products
Series illustration (not a photo of this item): 6311 2RS
You are viewingKG 6311 2RS

Everything the number specifies matches: series 63, 55 × 120 × 29 mm, contact seals on both sides, normal clearance, ordinary steel, design without special letters. The codes in the number are read against the KG catalogue.

02

Details

what this bearing is, questions

About the bearing

D 120d 55B 29
d×D×Bsize 55 × 120 × 29mm
Cdynamic 74.1kN
C0static 45kN
mweight 1.35kg

Deep groove ball bearing 6311-2RS, design 2RS: contact seals on both sides. Under GOST the same bearing is designated 180311.

C, C₀, m and limiting speed 8,000 rpm: KG 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 180311?

It is the same bearing under GOST 3189-89: 18 — contact seals on both sides, 0311 corresponds to the ISO base 6311. Size 55 × 120 × 29 mm, a full equivalent of 6311-2RS.

Will 6311 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.

03

Reviews

No reviews yet