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Wire Rope Diameter

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

Steel wire ropes for general applications

rope Ø

Tolerance of nominal diameter
on unloaded rope

2 to <40 +8
4 to <60 +7
6 to <80 +6
=80 +5

rope Ø

The difference between two measurements expressed as the percent from nominal diameter for unloaded rope

Rope with strands that are exclusively of wire

Ropes with strands that incorporate fibre centres
mmmax %max %
2 to <4+7-
4 to <6+6+8
6 to <8+5+7

Steel wire ropes for person elevators

rope Ø

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

Tolerance for nominal diameter for ropes with steel core

UnloadedLoaded to 5% of min breaking loadLoaded to 10% of min breaking loadUnloadedLoaded to 5% of min breaking load

Loaded to 10% of min breaking load

mmmax %min %min %max %min %max %
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
mmmax %max %
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Wire rope is generally delivered in a coil, plywood or wooden reel. On the European mainland a cross reel is also common. Please specify packaging when ordering.

Lifting and Handling

Ensure that the rope is not damaged by fork lifts or other handling equipment, by lifting or handling.

WARNING!Wrong handling/lifting can damage the rope.

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Wrong coiling can cause serious damage to the steel wire rope. Coil or wind according to the following:

- Reels should be rolled out or alternatively placed on a turnable centre.
- Cross reels and drums should be placed on a shaft that allows it to rotate.
- Wind and unwind the rope in the same direction.
- In some cases it may be necessary to brake the drum.

WARNING!Wrong "opening" of packing can cause serious  injury to personnel, first ensure that the rope is under control.

Never pull a rope from a stationary reel or drum - due to the risk of kinking.


Usually  ropes are supplied in cut lengths, with "tapered" ends made by annealing. If the rope is required to be cut during assembly the rope shall be seized each side of the cut, to prevent damage from opening strands and/or changing lay length.

One seizing either side of the cut is normally sufficient for preformed ropes. For "rotation resistant" and special wire ropes a minimum of two seizings each side of the cut will be necessary. The length of each seizing should be a minimum 2 x rope diameter.

Cutting should be made with a high speed abrasive disc cutter, cutting torch or other suitable mechanical or hydraulic shearing equipment.  

After the rope has been cut the seizing should be left until all the wires are welded or otherwise secured.

WARNING! Incorrect cutting can cause damage to the rope. Be extra careful when cutting rotation resistant ropes.

Use safety goggles and other appropriate safety equipment when using a disc cutter or other mechanical or electrical devices.

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Köysirumpu - ura

Drum - Correct Coiling

The rotation direction and the attachment point of the rope determines whether right or left hand lay rope should be used. To determine the correct rope the following rule should be followed:

Right thread groove on the drum - left hand lay rope.
Left thread groove on the drum - right hand lay rope.

WARNING! Incorrect choice of lay can adversely affect rope performance.

Pass a shaft through the reel and place the reel in a suitable stand which allows it to rotate and be braked to avoid over run during installation. Where multi-layer coiling is involved it may be necessary for the reel to be placed in equipment which has the capability of providing a back tension to the rope as it is being transferred from reel to drum. This is to ensure that the underlaying (and subsequent) laps are wound tightly on the drum.

WARNING! Incorrect coiling may cause severe damage to the wire rope as well as its performance. 

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Right hand lay ropeFrom right to left

Köyden asennus rummulle

Köysirumpu - monikerroksinen

Köysirumpu - tilavuus

Drum - Fleet Angle

Too large a fleet angle can cause excessive wear of the rope against the adjacent wrap on the drum. This can also lead to torsional problems.


Rope discard

Discard the wire rope in accordance with current regulations or according to the manufacturers recommendations.

Only a qualified and experienced person should be responsible for discard.

The pictures show typical examples of wire rope deterioration.

WARNING! Failure to take adequate precautions could result in injury.

Rope category numberNumber of load-bearing wires in the outer layer of strands in the rope aNumber of visible brokenb outer wires over a length of:
Section of rope working in steel sheaves and/or spooling on a single-layer drum
Sections of rope spooling on a multi-layer drum c
Classed M1 to M4 or class unknown d
All classes
Ordinary lay
Lang lay
Ordinary and Lang lay
1n ≤ 50241248
251 ≤ n ≤ 753623612
376 ≤ n ≤ 1004824816
4101 ≤ n ≤ 120510251020
5121 ≤ n ≤ 140611361222
6141 ≤ n ≤ 160613361226
7161 ≤ n ≤ 180714471428
8181 ≤ n ≤ 200816481632
9201 ≤ n ≤ 220918491836
10221 ≤ n ≤ 24010195102038
11241 ≤ n ≤ 26010215102042
12261 ≤ n ≤ 28011226112244
13281 ≤ n ≤ 30012246122448
Ropes having outer strands of Seal construction where the number of wires in each strand is 19 or less (e.g. 6 x 19 Seal) are placed in this table two rows above that row in which the construction would normally be placed based on the number of load bearing wires in the outer layer of strands.

a) Filler wires are not regarded as load-bearing wire and are not included in the values of n.
b) A broken wire has two ends (counted as one wire)
c) The values apply to deterioration that occurs at the cross-over zones and interference between wraps due to fleet angle effect.
d) Twice the number of broken wires listed may be applied to ropes on mechanisms whose classification is known to be M5 to M8.
e) d= nominal diameter of rope

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1. Mechanical damage due to rope movement over sharp edge projection whilist under load.


During  examination of steel wire ropes attention should be made specifically to the parts of the rope that are, known from experience, to be exposed to wear and damage.

Wear, broken wires, distortion and corrosion are the most common visible signs of deterioration.

Wear is a normal feature of rope service and the correct rope construction ensures that it remains a secondary aspect of deterioration. Correct lubrication of the rope may help to reduce both outer and inner wear.

Broken wires are normal features of rope service towards the end of the rope's life, resulting from bending fatigue and wear. The local break up of wires may indicate some mechanical fault in the equipment. Correct lubrication in service will increase fatigue performance.

Individual broken wires shall be attended to by removing the wire, see figure.

Distortions are usually as a result of mechanical damage, and if severe, can considerably affect rope strength.

Corrosion, both outer and inner, indicate unsuitable grease. Pitting on the external wire surface can result in broken wires. Inner corrosion occurs in some environments when lubrication is inadequate or of a unsuitable type. A reduction in rope diameter will frequently indicate this condition, but confirmation can only be made by an internal examination of the rope.

WARNING! Do not cut the wire, bend it until it breaks  close to the inside of the strajd. This reduces the risk of the ends of wires sticking out of the rope.

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Before installing a new rope the sheave grooves, layers and lubrication should be checked.

Measure the groove diameter with a radius gauge and check the general condition of the groove.

Groove diameter shall be nominal rope diameter +8% to +14% (0,54 x d to 0,57 x d).

WARNING! Worn sheaves should be replaced/refurbished.

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Sheave groove correctthe rope has maximal contact surface.

Maintenance - Lubrication

When a wire rope is in operation the individual wires rub against each other. To reduce the friction the rope is lubricated during manufacture. The lubrication improves the performance of the rope and increases its life.

Check the lubrication of the rope immediately after installation and clean the rope from inappropriate material, for example sand and dirt, periodically the rope should also be lubricated before use.

It is also important that lubrication is made in intervals of time depending on operating conditions and intensity of use.

WARNING! An unlubricated or incorrectly lubricated rope has a significantly reduced life.

Contact CERTEX for further advice and help on lubrication.

Certex Finland Oy * Juvan teollisuuskatu 25 C * 02920 Espoo * Puh: 0201 550 220 * sales@certex.fi