Hex Head (JIS Spec)

Hex head bolts are the go-to choice when you need strength, reliability, and easy installation in one simple package. Our hex head bolts are engineered to deliver consistent clamping force, clean wrench engagement, and long-term performance across everything from light machinery to heavy structural assemblies. Whether you are tightening one bolt or a thousand, our hex head range is designed to help your work go faster, hold stronger, and last longer.

Industrial-Grade Bolts You Can Trust

Our hex head bolts are built for real-world conditions where precision and durability matter. With cleanly machined heads and threads, they sit firmly against the mating surface and transfer torque efficiently, so your assemblies stay tight even under vibration, load, or thermal changes. 

These bolts are suitable for a wide variety of applications, including machine building, fabrication, construction, automotive, and equipment repair. Whether you are securing motor mounts, joining structural members, or assembling heavy equipment, our hex head bolts are designed to integrate seamlessly into your workflow.

To complete your joint design, pair our hex head bolts with our Hex Nut, Hex Jam Nut, and Heavy Hex Nut options, giving you the flexibility to lock, adjust, or reinforce connections exactly the way your application demands.

JISB 1180 Hex Head Bolts

A key part of our hex head collection is our range of bolts manufactured in line with the Japanese Industrial Standard JISB 1180. This standard defines the dimensions, tolerances, and mechanical performance required for general-purpose hex head bolts, so you know exactly what you are getting in terms of strength and fit. 

Our JIS B 1180 hex head bolts are produced to meet these requirements consistently, making them a dependable choice for maintenance teams, OEMs, and contractors who want predictable quality every time they open a box.

Materials, Strength Classes, and Finishes

To suit different environments, our hex head bolts are offered in a range of materials, including carbon steel for everyday industrial use and stainless steel for corrosive or outdoor conditions. 

Carbon steel options are ideal where strength and cost-efficiency are the priority, delivering excellent performance in controlled environments such as machinery, equipment, and indoor structures. Stainless steel hex head bolts provide superior corrosion resistance, making them a smart choice for applications exposed to moisture, chemicals, or weather.

Within each material category, you can choose from various strength classes so your fastener matches your design requirements. Higher strength classes are suited for high-load joints and critical connections, while standard classes work perfectly for general-purpose fastening.

Stronger Contact, Smarter Design

One of the primary advantages of a hex head bolt is the large contact area between the wrench and the head, which allows for efficient torque transfer and reduced risk of rounding during tightening. 

Our hex head bolts are manufactured with precise head geometry and accurate thread profiles, ensuring that they seat well, tighten smoothly, and resist loosening under service loads. This precision matters when you are working on assemblies where rework or downtime is costly.

Choosing the Right Hex Head Bolt

Selecting the ideal hex head bolt starts with understanding your load, environment, and assembly method. Consider the diameter and length required to achieve sufficient thread engagement without bottoming out or leaving too little thread engagement in the nut or tapped hole. 

Think about whether your application calls for coarse or fine thread, as coarse threads are often preferred for quick assembly and resistance to damage, while fine threads can provide more precise adjustment and slightly higher strength in tension.

FAQs

What is a hex head bolt?

A hex head bolt is a fastener with a six-sided head designed to be tightened or loosened using a wrench or socket. It usually features a partially or fully threaded shank and is used with a nut or tapped hole to clamp components together. Hex head bolts are popular because they offer strong torque transfer, easy tool access, and reliable performance in a wide range of applications.

What is the difference between a hex cap and a hex head bolt?

A hex cap screw, often called a hex cap, typically has tighter dimensional tolerances and may feature a washer face under the head for more precise clamping. Hex head bolts can be slightly less strictly controlled dimensionally and are commonly used in general-purpose applications where extreme precision is not required. In everyday use, the terms are sometimes used interchangeably, but for critical applications, the distinction in tolerances and head design can matter.

How to identify a hex head bolt?

You can identify a hex head bolt by its six-sided head, which is designed to fit standard hex wrenches and sockets. Look at the top of the head for property class or grade markings that indicate the bolt’s strength level, along with any manufacturer identification. The combination of the hex-shaped head, shank diameter, thread length, and head markings will help you confirm that you are working with a true hex head bolt suited to your application.