Measure wire diameter | © CERTEX Danmark A/S

Lifting KnowHow - CERTEX Danmark A/S

How to measure wire diameter correctly


The rope diameter shall always be checked before installation. Measure a straight part of the rope. Two parts with minimum distance of one meter shall at least be measured. By every point two measurements shall be done, with 90 degrees displacement in relation to each other. The average between the two measurements shall be according to the tolerance in the tables below.

Correct measure of steel wire diameter
          Right measurement
Incorrect measurement of wire diameter
         Wrong measurement

 

Wire rope tolerances

 

Steel wire ropes for general applications

 

  Nominal rope Ø   

  Tolerance of nominal diameter  
on unloadet wire

mm
%
2 to <4
0 +8
4 to <6
0 +7
6 to <8
0 +6
8 and up
0 +5

 

Nominal rope Ø

Tolerance of nominal dia. by unloadet rope

mm

Rope with strands that are
exclusively of wire max. %

 Rope with strands that incorporate  
fibre centres max. %
2 to <4
+7
-
4 to <6
+6
+8
6 to <8
+5
+7
8 and up
+4
+6

 

Steel wire for person elevators

Nominal rope Ø

Tolerance for nominal diameter for ropes with fiber core/synthetic core

Tolerance for nominal diameter for ropes with steel core
 
Unloaded
Loaded to 5% of min.
breaking load
Loaded to 10% of min.
breaking load
Unloaded
Loaded to 5% of min.
breaking load

Loaded to 10% of min.
breaking load

mm
max. %
min. %
min. %
max. %
min. %
max. %
=10
+6
+1
0
+3
0
-1
>10
+5
+1
0
+2
0
-1

 

  Nominal rope Ø  
Difference between two measurements expressed as percentage of
   nominal diameter under a load equivalent to 5% or 10% of min. breaking load    
 
Rope ovality
Average diameter variation
mm
max. %
max. %
<8
+4
+3
8 and up
+3
+2

 



 

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Learn about steel wire rope - use and maintenance