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igus® Ltd.

Caswell Road

Northampton, NN4 7PW

01604 677240

igubal® - Technical data

Application areas

igubal® bearing elements can be used without problems even in harsh environments. In moist or wet environments, the bearings are corrosion-free, and resistant to weak acids and alkalis. The operating temperatures range from -40 to +200°C. The insensitivity to dirt should also be emphasised, because even under extreme soiling, the plain bearings of the igubal® bearing elements do not require a seal. This is true for fine dust as well as coarse dirt.
Technical data of igubal X = temperature [ºC]
Y = percentage of tensile strength [%]

Diagram 02: Influence of temperature on maximum tensile strength of igubal® rod ends

igubal®Application temperature
 StandardHT versionFood
Max. long-term+80°C+200°C+100°C
Maximum, short-term+120°C+240°C+110°C
Table: Temperature limits of igubal® bearing elements


igubal® bearing elements can be used with different tolerances according to each application. They are designed with a large bearing clearance in the standard product range, which enables a secure operation even under high peripheral speeds. The hole of the spherical ball is produced to a standard tolerance range E10. Shafts should also meet recommended tolerances between h6 and h9. The tolerances are provided in the table below. Please contact us in case you require lower or other bearing tolerances.
Nominal size [mm]
 Plug gauge fallsPlug gauge sticks
0 to 3x.01x.05
> 3 to 6x.02x.07
> 6 to 10x.02x.08
> 10 to 18x.03x.10
> 18 to 30x.04x.12
> 30 to 50x.05x.15
Table: Tolerances of inner diameter (spherical balls)
Plug gauge

Media resistance

The spherical balls made from iglidur® W300 and the housing made from igumid G are resistant to weak alkalis, weak acids and fuels, as well as all types of lubricants. The moisture absorption of igubal® is about 1.3% by weight in normal climate. The saturation limit submerged in water is 6.5%. This must be taken into evaluation for applications. The HT version can be used for greater chemical resistance.
 StandardHT versionFood
Alcohols+ to 0+ 
Greases, oils without additives+++
Diluted acids0 to -+ to 00 to - 
Strong acids-+ to - 
Diluted alkalines+++
Strong alkalines0+ 
+ resistant   0 conditionally resistant   - unstable
All data at room temperature [20°C]
Table: Chemical resistance of igubal® bearing elements

Other benefits:


Parts of metal-detectable igubal® polymer bearings can be detected as foreign particles using all commercially available methods of metal detection technology, thus ensuring flawless food.

Radioactive emissions

Self-aligning igubal® plain bearings are radiation-resistant up to a radiation intensity of 3 x 102Gy.

UV resistance

The corrosion resistance of igubal® bearing elements makes them particularly interesting for outdoor use. igubal® bearings are permanently resistant to UV radiation. A small change in colour (dark colouration) of the spherical ball due to UV radiation and other weathering effects does not affect the mechanical, electrical or thermal specification.

Thread type Pitch [mm]
M 2 0.40
M 3 0.50
M 4 0.70
M 5 0.80
M 6 1.00
M 8 1.25
M 10 1.50
M 10 F 1.25
M 12 1.75
M 12 F 1.25
M 14 2.00
M 16 2.00
M 16 F 1.50
M 18 1.50
M 20 1.50
M 20 2.50
M 22 1.50
M 24 2.00
M 27 2.00
M 30 2.00
Table 03: Thread pitches of igubal® rod ends


The load capacity of the maintenance-free igubal® bearing elements is very high at normal ambient temperatures. igubal® bearing elements absorb high forces and weigh only a fifth of conventional metallic bearing housings. The excellent dampening properties are based on the fact that the plastic material of the two part bearing can absorb vibrations differently than steel.

However, plastic-specific specifications, such as dependence on temperature and behaviour under long-term stress, must be taken into consideration. For this reason, the load-bearing capacity of the rod ends should be tested in individual practical tests, especially with high continuous loads, low load speeds and higher temperatures.

Coefficient of sliding friction and speed

One important advantage of igubal® bearing elements is that rapid, rotary movements of a mounted shaft take place directly in the spherical ball portion made of iglidur® W300. The advantage therefore lies in the plastic vs. steel relationship. Polymer produces lower friction and permits high speeds, even in dry operation. Taking the radial loads into account, maximum surface speeds up to 0.5m/s rotating can be attained.

The angular movements of the spherical bearings, on the other hand, take place on the spherical outer diameter of the spherical portion.

The maintenance-free igubal® bearing elements also permit linear movements of the shaft.

The terms "igus", "Apiro", "chainflex", "CFRIP", "conprotect", "CTD", "drylin", "dry-tech", "dryspin", "easy chain", "e-chain", "e-chain systems", "e-ketten", "e-kettensysteme", "e-skin", "e-spool", "flizz", "ibow", "igear", "iglidur", "igubal", "igutex", "kineKIT", "manus", "motion plastics", "pikchain", "readychain", "readycable", "ReBeL", "speedigus", "triflex", "robolink", "xirodur", and "xiros" are legally protected trademarks of the igus® GmbH/ Cologne in the Federal Republic of Germany and where applicable in some foreign countries.

igus® GmbH points out that it does not sell any products of the companies Allen Bradley, B&R, Baumüller, Beckhoff, Lahr, Control Techniques, Danaher Motion, ELAU, FAGOR, FANUC, Festo, Heidenhain, Jetter, Lenze, LinMot, LTi DRiVES, Mitsubishi, NUM,Parker, Bosch Rexroth, SEW, Siemens, Stöber and all other drive manufacturers mention on this website. The products offered by igus® are those of igus® GmbH