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How To Prevent Stainless Steel Bolt Break
Make sure your nut and bolt have a hardness difference of at least 50 Brinell. This is because the different alloys harden at different rates, lessening the chance of galling. The mechanical fit should be correct – tight enough to prevent vibration and wear, but with sufficient clearance to prevent galling.
- Slow Down Installation Speed. …
- Don’t Use Bolts to Pull Joints Together. …
- Use a Lubricant. …
- Avoid Damaged or Dirty Threads. …
- Use Extra Care With Lock Nuts. …
- If a Fastener Begins to Bind: STOP.
Use an anti–seize compound when wrenching on stainless steel fasteners. The corrosion resistance of stainless steel is a godsend on saltwater boats. But stainless does have a downside when it comes to nuts and bolts, especially large ones with thick threads. The alloy has a tendency to “gall,” or seize.
Here are 7 common solutions:
- Use proper lubricants.
- Slow down tightening speed.
- Choose coarse threads where possible.
- Avoid cut bolt threads.
- Mix nut and bolt grades while maintaining mechanical properties.
- Beware of prevailing torque lock nuts.
- Keep threads clean; follow torque specs.
Stainless steel bolts are rated for corrosion resistance. Bolt strength is rated in PSI (pounds per square inch). A stainless steel bolt has the same PSI rating as a grade 5 bolt (125,000 PSI). A grade 8 bolt has a stronger rating with a PSI of 150,000.
Stainless steel, in most cases, is non-magnetic. With bolts, stainless steel can be identified by the head marking. These markings indicate steel grade and tensile strength. When installed, stainless steel screws and bolts are known for their longevity.
Grade 8 bolts have been hardened more than grade 5 bolts. Thus they are stronger and are used in demanding applications such as automotive suspensions.
Stainless Steels and Magnets
Steel is a metal that magnets stick to because iron can be found inside steel. However, stainless steels comprise a large group of steel alloys that are made of different metal compositions. While some have more chromium, some might have more iron in them.
Steel is a metal that magnets stick to because iron can be found inside steel. However, stainless steels comprise a large group of steel alloys that are made of different metal compositions. While some have more chromium, some might have more iron in them.
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