Connection measures ISO suspension0 pages

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Technical information
Connection measures ISO suspension
Today, the ISO suspension is world-wide the most common way of connecting forks to the lift-truck.
According to the rated truck capacity the ISO standard consists of 5 classes, each of them having a form „A“ and „B“ (e.g. class „2A“
or „2B“). The difference in the forms „A“ and „B“ is the fork drop (clearance lower hook to floor).
All measures are defined in the international standard ISO 2328. In the table below, the most important measures are listed.

Fork carrier

Class

Load centre

Form

ISO 1

Rated lift-truck
capacity
kg
0-999

mm
400+600a)

ISO 2

1,000-2,500

500+600b)

ISO 3

2,501-4,999

500+600

ISO 4

5,000-10,000

600

ISO 5** 8,001-10,999

600

ISO
1A
1B
2A
2B
3A
3B
4A
4B
5A
5B

Drop a
clearance
mm
76
114
76
152
76
203
127
254
127
257

b

c1+1

c2-1

h1±3

h2*

mm
331

mm
16,5

mm
16

407

16,5

16

508

22

21,5

635

26

25,5

728

35

34

mm
394
432
470
546
568
695
743
870
830
960

mm
306
306
382
382
477
477
598
598
680
680

k1
min.
mm
14

k2-1,5
mm
13

m1
max.
mm
31

14

13

31

17

16

40

20

19

47

26

25

65

ISO 1 + 2:t
Tolerance + 1 mm
ISO 3,4 + 5:t
Tolerance + 1.5 mm
ISO 5 is introduced in 2003 and therefore still unusual in Europe.
The capacity range of 5,000—10,000 kg will still be covered by ISO 4, as it was usual until now.

a)t
b)t

ISO mm
1A 475
1B 510
2A 550
2B 625
3A 655
3B 780
4A 845
4B 970
5A 930
5B 1060

600 mm is used in the USA
600 mm is used in the USA, Asia, Australia

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t
** t
t

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