How to Prevent Galling on Stainless Steel Bolts
Galling occurs when two stainless steel fasteners weld together due to high heat and friction. Once galling occurs, the bolt and nut have to be cut apart. Stainless steel fasteners can be used in a number of applications including weatherproof applications, food services and machining. Each application may require only one method to reduce or eliminate galling, while others may require several preventative methods.
- Difficulty:
- Easy
Instructions
Things You'll Need
- Lubricant
- Low-rpm fastening tool
- Stainless steel fasteners
- Wrenches or socket wrenches
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1
Prior to assembling, place lubricant onto the nut and bolt. Use a lubricant made specifically for reducing or eliminating galling between stainless steel fasteners, such as Fastorq Anti-Gall/Anti-Seize lubricant, or other products containing graphite, talc and mica.
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2
Insert the stainless steel bolt where needed and attach a nut. Tightening the bolt by hand will drastically reduce friction, which will eradicate the chance of galling completely. Since this technique will require a lot of assembly time, it is best to use it only when working on small projects.
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3
Set a driving tool, such as an adjustable electric drill, to a low rpm. The lower speed will reduce friction between the bolt and nut. Most electric tools and some air-powered tools feature a lower setting.
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4
Use a power tool, such as a electric drill, to tighten the nut and bolt. Place a wrench or socket at the opposite side in order to hold the fastener in place and reduce spin while tightening.
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5
If galling continues to occur, try various combinations of stainless steel metal bolts and nuts. Hard metals will reduce the heat break down of the stainless steel. Different types of stainless steel contain a variety of metals, which are marked on packaging. Using a combination of hard and soft metals will prevent the break down of the bolt or nut, so that they won't deteriorate at the same time. This will also prevent heat from welding them together.
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