M6 zinc-nickel alloy black high salt spray with washer combination screw is a high-performance fastener designed for the automotive industry with the following features:
Material: high-strength steel substrate + zinc-nickel alloy plating (usually 12-15μm).
Surface treatment: black passivation treatment.
Salt spray test performance: up to 720-1000 hours.
Matching components: integrated combination design including flat washers and spring washers.
Applicable environment
Automobile chassis system, engine peripheral components;
Brake system
Other high corrosion risk areas (such as coastal areas or winter salt road environment)
Usage steps
1. Preparation before installation
Check thread matching: Confirm that the threaded hole of the connected part matches the M6 screw.
Clean contact surface: Remove oil, rust, and impurities on the connection surface.
Check the washer status: Make sure the washer is not deformed or damaged.
2. Installation process
Manual pre-tightening: First, screw the screw into 3-5 threads by hand to ensure that there is no deflection
Tool selection: Use a torque wrench
Step-by-step tightening
Step 1: Tighten to 50% of the target torque.
Step 2: Check the alignment of the components.
Step 3: Finally, tighten to the specified torque value.
3. Post-installation inspection
Visual inspection: Confirm that the gasket is completely flattened and not twisted.
Torque verification: Randomly check 5% of the fastening points for torque verification.
Marking inspection: If the torque marking method is used, check the alignment of the marking.
Precautions
Lubrication is prohibited: The zinc-nickel alloy coating itself has good lubricity. Additional lubrication will change the friction coefficient and affect the torque accuracy.
One-time use: It is recommended to use the key connection in a high salt spray environment once, and a new screw should be replaced after disassembly.
Storage conditions: Keep dry when not in use, relative humidity <60%
Mixed use is prohibited: screws from different batches or with different surface treatments must not be mixed on the same component.
Maintenance recommendations
Check the tightening status every 12 months or 20,000 kilometers.
Pay attention to whether the coating has abnormal corrosion or wear during inspection
Replace the gasket immediately if it loses elasticity
Treatment of common problems
Thread stuck: Use special thread repair tools, and do not force the screw in
Coating damage: Minor damage can be treated with special repair paint, and the damaged area >5% should be replaced
Corrosion signs: When white corrosion products appear, replace them in time and check the adjacent fasteners
This product complies with relevant standards such as ISO 4042 and DIN 267-10. Please refer to the specific technical requirements of the vehicle manufacturer when using it. It realizes the core needs of the automotive industry for high strength, high corrosion resistance, and convenient assembly through the triple guarantee of "coating + structure + material", and is a cost-effective solution for harsh environments.
