Screws vs. Bolts: What’s the Difference in Automotive Applications?

Every body shop and car enthusiast will need both screws and bolts in their collection of automotive fasteners, but their applications are very different. Distinguishing between them may also be more difficult for those just starting their car repair journey. At ROGO, we’ve created a short-hand guide to understanding their differences and applications:

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1. Screw vs. Bolt Applications
1. Bolts hold structural parts together, while screws hold smaller components in place.
1. Example:
1. Screws are used to keep panels and trim in place while bolts keep suspension systems together
2. Bolts require nuts and washers to hold components in place, while screws generally can fit into a hole without other fastener parts.
2. Screw vs. Bolt Size / Shape
1. Screws are smaller in size, including thread and head. Screw threads go the length of the screw, while bolt threads only go part of the way. Bolts are generally larger with very different threads.
1. Pro Tip:
1. Bolts have more torque which means you can use more pressure when tightening components together
2. Screw head shape is typically flat or rounded. The head of a bolt is in the shape of a hexagon or square.
3. Screw and Bolt Materials
1. Stainless Steel
1. Stainless steel fasteners are better known for their resistance to corrosion over time. For parts that are exposed to moisture.
2. Plastic
1. More cost effective than their metal counterparts, but more for cosmetic or insulation purposes.
3. Steel
1. Cost effective and higher in strength

References:

• https://blog.thepipingmart.com/fasteners/machine-screws-vs-bolts-whats-the-difference