Poor glue performance of bolts? cause analysis

1. Inadequate surface cleaning

Oil, dust, rust or old rubber residue on the thread surface is the biggest obstacle to adhesion. They form an isolation layer that prevents the glue from effectively contacting the metal substrate, resulting in reduced adhesion or non-solidification.

Countermeasures: Before gluing, be sure to thoroughly clean the threads with a special cleaning agent (such as acetone, isopropyl alcohol) to ensure that they are“ clean, dry and grease-free”.

2. Wrong adhesive selection

Different working conditions require adhesives with different characteristics. Using the wrong model will directly lead to failure.

Countermeasures:Choose based on needs

● Strength: Select low-strength glue for frequently disassembled areas; select high-strength glue for high-vibration environments.

● Materials: Pay attention to the compatibility of glue with plastic or special metals to avoid corrosion.

● Clearance: Select a product with appropriate filling capacity based on the thread fit clearance.

3. Non-standard gluing process

The more glue is not the better, the quantity and location are the key.

Countermeasures: Avoid insufficient or excessive quantities. It is generally recommended to apply glue to the 2-3 teeth of the bolt, or use dot or strip coating to ensure that the glue can evenly fill the entire engagement surface after tightening.

4. Curing conditions are not met

Anaerobic adhesives need to be isolated from air before they can be completely cured.

Countermeasures: Ensure that the thread fit clearance is within a reasonable range. For inert surfaces (such as some stainless steel) or low-temperature environments, accelerators can be used to activate and accelerate the curing reaction.

5. Improper assembly operation

Details during the assembly process directly affect the final result.

Countermeasures:

● Time: After gluing, tightening should be completed within the assembly time specified by the product“”.

● Operation: The screwing speed should not be too fast to avoid the glue being scraped and accumulated. It should be applied smoothly to ensure even distribution.

6. Product failures and storage issues

Using adhesives that have expired or deteriorated due to improper storage (high temperature, exposure) will naturally not achieve the expected results.

Countermeasures: Buy regular brand products and store them strictly in accordance with the instructions, paying attention to the shelf life.

To solve the problem of poor glue coating performance of bolts, it is necessary to systematically investigate the entire process of selecting glue“→→ and→ curing→ assembly from surface treatment”. Only by accurately locating the root cause of the problem canlocking reliability beeffectively improved. For more technical problemswith fastener anti-loosening, please call for consultation: 4008-717-355.

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