KG
Drawing of 688 ZZ: ⌀8 × ⌀16 × 5 mm688 ZZZZ
Fig. 1: 688 ZZ, 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 688 ZZ

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

Bearing KG 688 ZZ

Price on request
Available to order

Specifications

Manufacturer number
ISO designation
d
8 mm
Bore diameter dBearing bore = shaft diameter. Source: supplier data
D
16 mm
Outside diameter DOutside diameter = housing bore. Source: supplier data
B
5 mm
Width BRing width. Source: supplier data
Seal
ZZshields, both sides
Clearance
normal clearance
C
1.125 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
0.537 kN
Basic static load rating C0Permissible load without rotation and under shock; ISO 76 method, manufacturer’s figure. Source: supplier data
Limiting speed
38,700 rpm
Limiting speedMechanical limit; depends on the seal (SKF 6200: 36,000 open, 17,000 with 2RSH). Source: supplier data
m
0.003 kg
MassWeight of the product. Source: supplier data
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Equivalents

the same size 8 × 16 × 5 from other brands

2 products
Series illustration (not a photo of this item): 688 ZZ
You are viewingKG 688 ZZ

Everything the number specifies matches: ordinary steel, design without special letters. The codes in the number are read against the KG catalogue.

  • Series illustration (not a photo of this item): 688 ZZ688 ZZThis bearingKG8 × 16 × 5available to orderon requestyou are here
  • Series illustration (not a photo of this item): 688 ZZ688 ZZCT8 × 16 × 5available to order€0.23Request a quote
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Details

what this bearing is, questions

About the bearing

D 16d 8B 5
d×D×Bsize 8 × 16 × 5mm
Cdynamic 1.125kN
C0static 0.537kN
mweight 0.003kg

Deep groove ball bearing 688-ZZ, design ZZ: metal shields on both sides.

C, C₀, m and limiting speed 38,700 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.

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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