Mechanical Tests

Standard/              applicable to

 Title                             Keyword/        Meas. unit  Conditions    Description                                

DIN 267-27

Screw pastes

Break away torque x Tightening torque M 10 A2/40 Nm/400 °C/100 h
(OKS Standard)
Ratio of break away torque required to release a screw connection compared to starting torque. Often following high temperature loading.

DIN 51 350

Oils, greases, pastes

Testing of lubricants; testing in the Shell-four-ball tester
Part 1: General working principles
Part 2: Determination of welding load of fluid lubricants
Part 3: Determination of welding load of fluid lubricants
Part 4: Determination of welding load of consistent lubricants
Part 5: Determination of wear characteristics for consistent lubricants
VKA test/
welding load: N
wear: mm
Welding Load: 1420 rpm
Wear (oils): 1420 rpm, 1 h, 150 N (Method A) or 300 N (Method B)
Wear (greases): 1420 rpm, 1 h, 150 N (Method C), 300 N (Method D) oder 1000 N (Method E)
Determination of characteristic values for lubricants that are suitable for use where high surface pressures occur in the mixed-friction zone between surfaces that move relatively to each other. The test makes use of a rotating ball, pressed against three identical, stationary balls. Measurements can be made of the force required to produce welding between the balls (welding load) or of the amount of wear on the balls after application of a defined force over a defined time.

DIN 51 354-2

Oils, fluid greases

FZG damage loading step Load stage A, 8,3/90
A2, 76/50
Testing of the load capacity of gear lubricants.

DIN 51 354-2

Oils, fluid greases

FZG wear mg/kWh A, 8,3/90
A2 76/50
Testing of the load capacity of gear lubricants.

DIN 51 806

Roller bearing greases

SKF R2F Operting Test A
SKF R2F Operting Test B
none
none
2500 rpm, 20 d
1500 rpm, 20 d, 120 °C
Determination of lubricating properties of rolling bearing greases at room temperature (Operating Test A) and at a defined temperature (Operating Test B).

DIN 51 807-1

Greases (pastes)

Testing of lubricating greases in the presence of water, static test Water resistance/
Evaluation class 0 to 3 at stated test temperature
Specified temperature (usually 90 °C), distilled water, 3 h test duration A 1 mm thick layer of lubricating grease is applied to a glass plate and is subjected to the effect of still water for 3 hours at a specified temperature. Afterwards, any changes will be evaluated.

DIN 51 807-2

Greases (pastes)

Testing of lubricating greases in the presence of water, dynamic test  Water resistance/
Evaluation class of mass loss at stated test temperature
1 h, 40 °C or 80 °C water temperature, 600 rpm Water is sprayed on a grooved ball bearing that is filled with lubricating grease. The change in the mass of the grease in the bearing is measured.

DIN 51 810-1

Rolling bearing greases

Determination of shear viscosity of lubricating greases using a rotation viscosimeter 
Part 1: Ball/plate mearurement system
Apparent dynamic viscosity/
Pa . s or in %
For lubricating greases in NLGI classes 000 to 2 at constant shear rate. Test run at stipulated speeds and times. The shear viscosity of lubricating grease is determined by measuring the torque at a constant temperature and speed. The initial and final viscosity are measured. The shear viscosity indicates the stability of a grease.

DIN 51 818

Greases

 

Lubricants; consistency classification of lubricating greases; NLGI grades NLGI grades/
NLGI grade
Measurement of the worked penetration after 60 double cycles at 25C as defined in DIN ISO 2137 Classification of lubricating greases by level of worked penetration for simple marking of products to indicate consistency.

DIN 51 821

Roller bearing greases

Testing of lubricants using the FAG FE9 rolling bearing test device
Part 1: General working principles
Part 2: A/1500/6000 test method
FE 9 Lubrication greases NLGI 1 to 4, between 120°C an 200 °C Mechanical dynamic testing of lubricants to determine the lifespan under realistic conditions. Several bearings are filled with grease and tested until they fail. The test method described in part 2 is used to determine the upper operating temperature for rolling bearing greases. Under these test conditions: installation type A, axial load 1500 N and speed 6000 rpm, the grease achieved 100 hours at the to-be-stated temperature. The probability of bearing failure is 50 % (F50).

DIN 51 834-2

Oils

Testing of lubricants; Tribological test in the translatory oscillation apparatus (SRV). Determination of measured quantities for friction and wear for lubricating oils SRV test/
µ
mm
Cylinder/disc, 450N, 1000µm, 50Hz, 2h (OKS standard) The test establishes the friction coefficient between the specimens and the wear on the specimens after a specified test duration.

DIN EN ISO 16041

Screw pastes

Thread friction coefficient µ Screws: ISO 4017 M10x55-8.8 vgs
nut: ISO 4032 M10-10 vgs.
Determination of friction coefficient by tightening of threaded fasteners.

DIN ISO 2137

Greases, pastes

Penetration
- unworked penetration
- worked penetraton
- penetration loss

0,1 mm
0,1 mm
0,1 mm

- no shear stress
- with shear stress (60 double cycles)
- with shear stress
Determination of the consistency of a lubricant with and without application of shear stress.

E DIN 51 833

Assembly pastes

Press-fit-test µ, N   Testing of the lubricating effect of pastes under very high pressures at low speeds.

SEB 181 302

Roller bearing greases

Timken mg 43 lbs Determination of the wear protection properties of a rolling bearing grease for a defined load