Push out force is vital to roller chain reliability, ensuring pins and bushes stay secure under heavy loads. Unlike tensile strength, it has limited international standards, with API SPECIFICATION 7F being the only one. At MCC, every chain undergoes strict push out force testing to guarantee durability and consistent performance.
What Is Push Out Force?
Push out force refers to the strength required to push the pin from the outer plate or the bush from the inner plate of a roller chain.
- Also called pushing force or pressing force
- Key factor in roller chain design
- Prevents looseness, separation, or breakage during operation
If the push out force is insufficient, the chain may loosen, disengage, or fail under load.
Factors That Affect Push Out Force
The required push out force depends on several factors:
- Application: Heavy-duty vs. light-duty usage
- Chain size: Larger chains demand higher push out force
- Material quality: Stronger steels and treatments increase resistance
- Load conditions: Higher operational loads require higher values
Push Out Force vs. Tensile Strength
Although both represent strength properties:
- Tensile strength: measures the maximum load a chain can withstand before breaking
- Push out force: measures the resistance of pins and bushes against loosening
#Only tensile strength has widely adopted international minimum standards.
#The API SPECIFICATION 7F Oilfield Chain Standard is currently the only global standard that specifies push out force.
MCC’s Push Out Force Testing
At MCC, push out force is verified using the same advanced equipment applied for tensile strength tests:
- Chain sample is placed on the test machine
- Pressure is applied directly on the pin or bush
- The force required to push it out is recorded
- Data ensures the chain meets design strength and durability requirements
This process guarantees that every MCC roller chain is built to withstand demanding applications.
Conclusion: Ensuring Reliable Roller Chains
Push out force is a critical yet often overlooked factor in chain performance. By performing strict push out force testing, MCC ensures its roller chains deliver strength, durability, and safety for diverse industrial applications.
Looking for tested and reliable roller chains? Contact MCC for technical details and custom solutions.
