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Drawing of 6311-2Z: ⌀55 × ⌀120 × 29 mm6311-2Z2Z
Fig. 1: 6311-2Z, 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 6311-2Z

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

Bearing SKF 6311-2Z

€25.59per piece
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Specifications

Manufacturer number
ISO designation
GOST number
Equivalents
4 exact, 38 approximate
d
55 mm
Bore diameter dBearing bore = shaft diameter. Source: two supplier sources
D
120 mm
Outside diameter DOutside diameter = housing bore. Source: two supplier sources
B
29 mm
Width BRing width. Source: two supplier sources
Seal
2Zmetal shields on both sides
Clearance
normal clearance
C0
45 kN
Basic static load rating C0Permissible load without rotation and under shock; ISO 76 method, manufacturer’s figure. Source: two supplier sources
m
1.35 kg
MassWeight of the product. Source: two supplier sources
01

Equivalents

the same size 55 × 120 × 29 from other brands

44 products
Photo: 6311-2Z
You are viewingSKF 6311-2Z
€25.59baseline for the price comparison

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

Under the price: the difference from the price of this bearing (€25.59).
02

Details

what this bearing is, questions

About the bearing

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

Deep groove ball bearing 6311-ZZ, design 2Z: metal shields on both sides. Under GOST the same bearing is designated 80311.

C₀, m: SKF 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 80311?

It is the same bearing under GOST 3189-89: 8 — metal shields on both sides, 0311 corresponds to the ISO base 6311. Size 55 × 120 × 29 mm, a full equivalent of 6311-ZZ.

Will 6311 2Z 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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