Hex Bolts
Hex Bolts are among the most versatile and widely used fasteners in various application. We can manufacture many custom hex bolts to your specification.
Manufacturing Special Hex Bolts
Zinc Plated Hex Bolts Corrosion Resistant
Stainless Steel Hex Bolts 304 Grade
DIN933 Stainless Hex Bolts Full Thread
Wholesale Hex Bolts Bulk King Tower
ISO 4014 Hex Bolts Partial Thread
Heavy Duty Long Hex Bolts for Construction
What is the meaning Lines on the top of a hex bolt head?
Sometimes we notice lines on the heads of hex head bolts, what purpose do these lines serve? Those lines or markings on the top of a hex bolt head are not decorative. They are strength identification marks. Their purpose is to tell you the bolt's grade and hardness at a glance, helping you avoid using the wrong bolt in critical applications.The marking system differs depending on whether the bolt follows Imperial (US/SAE) standards or Metric (ISO/DIN) standards.Under North American standards (such as SAE), the raised lines on the bolt head serve as the most direct indicator of strength. You can determine the grade by counting the number of lines and observing their shape.
| Marking | Grade | Tensile Strength | Typical Use |
| 3 radial lines | Grade 5 | ~120,000 psi | Automotive chassis, general machinery |
| 6 radial lines | Grade 8 | ~150,000 psi | Engines, heavy equipment, critical load points |
Hex Bolt Market Solutions
Hex Bolt for Backflow Preventers
The customer come from the U.S. manufacturing Automatic Control Valves, Strainers & Relief Valves. This Grade 8 SAE J429 bolt is specifically designed to meet the needs of backflow preventer products. Featuring a 7/16''-14 UNC 2A thread and a total length of 1.16 inches, this yellow zinc hex head bolt is easy to install and remove using standard tools. We have been supplying this kinf high strength bolt to our customers since 2014.
Hex Bolts for Outdoor Furniture Rust Proof
One of our customer manufacturing wooden benches, garden loungers, and picnic tables. We known one common problem arises: rust. Standard steel bolts corrode quickly when exposed to rain, humidity, or morning dew, leaving ugly brown stains on the wood and weakening the structure. The solution is the M6 x 130mm Stainless Steel 304 Hex Bolt. This kind SUS304 hex bolt will not rust or pit even after years of rain, sprinkler spray, or coastal humidity.
About King Tower
With 20+ years custom made experience, we offer the most reliable source for high quality fastener parts ranging from screws and bolts to CNC machining parts, stamping parts, and more.
Why Choose Us
King Tower fasteners are meticulously crafted according to customer's drawings or samples to ensure that they meet precise specification. With years of production experiences and production machines, King Tower wide diverse range of fasteners are featured with hundreds of materials, head type, thread style, size, heat treatment, plating and secondary operation.
