High Strength Metric Square Head Bolts

High Strength Metric Square Head Bolts are mostly made from medium carbon steel—like grades 4.6, 5.6, 8.8. These give a good mix of strength, ability to bend a little without breaking, and don’t cost too much. If you need stronger ones for important jobs, there are higher grades like 10.9 or 12.9.

Stainless steel versions (A2/A4-304/316) are good at not rusting. Metric square head bolts made of brass or silicon bronze are not only completely non-magnetic (suitable for scenarios sensitive to magnetic fields), but also have outstanding rust resistance in marine environments - they can effectively resist seawater erosion and have a longer service life than bolts made of ordinary materials. The material you pick directly affects how much they can be pulled before breaking, how much force they can take before bending, and how well they hold up in different environments.

Application Scenario

High Strength Metric Square Head Bolts are often used to fix up or maintain older machines—especially in Europe—that were made to use square fasteners. They’re pretty common in wood framing and wood construction too, because their big contact area keeps them from sinking into the wood as much.

They work really well in tight spots where socket wrenches or hex wrenches just won’t fit. You’ll also see them used to secure railroad parts, farm equipment, and in fixing up old vehicles. They’re good for any job where you need a bolt that sits flush or low to the surface, too.

Product Parameters

FAQ

Q: Do you offer corrosion protection coatings on High Strength Metric Square Head Bolts? What types are most durable?

A:Yeah, we have different coatings on High Strength Metric Square Head Bolts to keep them from rusting. Common ones are hot-dip galvanizing and zinc plating. If you need them to hold up really well, especially in tough spots, hot-dip galvanized ones have the thickest, longest-lasting protective coating. Mechanical plating is pretty strong too, though.