The Hillman Group Metric Flange Bolt M12-1.75 x 80

If a joint needs a broad bearing surface built into the fastener, this flange bolt offers a different approach from a standard hex bolt paired with a separate washer. Its integrated flange is designed to spread clamping force and help resist loosening.

The M12-1.75 x 80 mm size and three-pack format make this a specific replacement or maintenance buy, not a general-purpose assortment.

If you prioritize fewer separate parts at assembly, the built-in flange is useful, if you prefer choosing a washer separately for each joint, a conventional bolt may suit your process better.

Getting the most from it

The hex head accepts a wrench or socket, while the metric coarse thread draws the joint tight. Under the head, a serrated flange provides a wider bearing face than a plain bolt head and is intended to bite against the surface. That means there’s no separate washer to handle for applications where the bolt’s integrated flange is appropriate.

Picture a repair where you’re holding an assembly in position and reaching for the fastener: using one bolt rather than pairing a bolt with a loose washer can make that step simpler. The flange also spreads the load across a broader area, which is useful when the joint design calls for that kind of bearing surface. The zinc plating is specified for corrosion resistance, while the Class 10.9 alloy steel is intended for demanding automotive and machinery joints.

Without having tried it, the practical check is fit: confirm the thread, length, and required fastener specification for the assembly before installation. An integrated flange is not a reason to ignore a joint’s requirements, and it may not replace a separate washer where the design specifically calls for one.

Why it’s worth it

The main appeal is combining the bolt and bearing surface in one part. That can reduce loose hardware during repair or maintenance and gives the clamping force a broader area to act on. The serrated flange is also designed to resist loosening, a useful feature for automotive, engine, suspension, and machinery work where a secure joint matters.

Class 10.9 alloy steel makes this more targeted than a basic, unspecified fastener, while the zinc plating adds a measure of corrosion resistance. Those details point to repair and equipment applications rather than casual household fastening. They don’t, by themselves, confirm suitability for every vehicle or machine, the required fastener grade and dimensions still need to match the job.

It’s a great fit if you need this exact metric size, want an integrated bearing flange, and can use all three bolts for repair or maintenance. It’s not for you if the assembly calls for another size, a different fastener specification, or a washer selected separately.

At a glance

• Size: M12-1.75 x 80 mm
• Pack: 3 bolts
• Head and flange: Hex head with an integrated serrated flange
• Material and finish: Class 10.9 alloy steel with zinc plating
• Intended uses: Automotive, engine, suspension, and machinery assemblies

This is a focused pack for a known fastener requirement, rather than a mixed kit for figuring out what might fit. The available details don’t specify dimensions beyond the stated size, installation torque, or compatibility with a particular vehicle or machine, so those should come from the assembly’s requirements—not guesswork.

Should you buy it?

Buy it when the job calls for an M12-1.75 x 80 bolt with a Class 10.9 rating and an integrated serrated flange, and when zinc-plated alloy steel is appropriate for the application. The built-in bearing surface is the reason to choose this style over a plain hex bolt and separate washer: fewer pieces to manage, with the flange designed to spread clamping force and resist loosening.

Skip it if you’re still identifying the fastener, need a different length or thread, or have instructions that specify another bolt or washer arrangement. For a planned automotive or machinery repair, matching the exact requirements matters more than the convenience of a three-pack.