| Product Details | Metric |
| Dia | M6 - M42 |
| Length | 16 MM – 400 MM |
| Grade | 8.8, 10.9, 12.9 |
| Standard | ISO 4162, DIN 6921, JISB 1189 |
New Star Industries is a leading Flange Bolts Manufacturer in India, producing robust fasteners that provide excellent load distribution and vibration resistance. Our flange bolts are available in diameters from M6 to M42 and lengths between 16 mm and 400 mm, manufactured in grades 8.8, 10.9, and 12.9. These bolts conform to ISO 4162, DIN 6921, and JIS B 1189 standards, ensuring consistent quality and dimensional accuracy. Widely used in automotive assemblies, machinery, and structural applications, our flange bolts offer secure fastening and reduced need for separate washers, improving assembly efficiency and reliability.
A flange bolt is essentially a hex bolt with an integrated, wider flange built into the underside of the head. This flange acts like a built-in washer, spreading the clamping load over a larger surface area the moment the bolt is tightened. In practical terms, this means fewer loose parts to handle during assembly, less chance of a washer being missed or misaligned on the line, and a more consistent clamp force across the joint. It's a small design change that solves a common, everyday assembly problem.
New Star Industries manufactures flange bolts in grades 8.8, 10.9, and 12.9, giving customers a clear choice depending on how much load the joint needs to carry. Grade 8.8 is generally sufficient for general machinery and lighter structural connections. Grade 10.9 steps up the tensile strength for automotive and higher-stress mechanical assemblies, while grade 12.9 is reserved for the most demanding applications where the joint must resist high torque and dynamic loading without loosening over time. Choosing the correct grade isn't just about strength on paper — it also affects how the bolt behaves under repeated vibration, which is where flange bolts are most commonly specified.
Flange bolts are commonly supplied in two flange designs — serrated and non-serrated (plain flange). Serrated flange bolts have small ridges machined into the underside of the flange, which bite slightly into the mating surface as the bolt is torqued down. This adds extra resistance against loosening in high-vibration environments such as engine mounts, exhaust systems, and chassis components. Non-serrated flange bolts are used where the mating surface finish needs to stay undisturbed, or where the joint doesn't see significant vibration. We manufacture both types depending on the customer's drawing and application requirement.
Our flange bolts conform to ISO 4162, DIN 6921, and JIS B 1189 — three of the most widely referenced international standards for flange bolts. ISO 4162 and DIN 6921 are largely used across European and general industrial applications, while JIS B 1189 is the standard most often specified by Japanese automotive OEMs and their supply chains. Manufacturing to all three allows us to serve customers working to different design specifications without needing to requalify a new supplier for each standard.
Flange bolts from New Star Industries are widely used in automotive assemblies — including engine, transmission, and suspension components — where vibration resistance and consistent clamp load matter. They are also specified in general machinery, agricultural equipment, and structural steel connections where reducing the part count (by eliminating a separate washer) speeds up assembly without compromising joint integrity.
Beyond our standard range, New Star Industries manufactures flange bolts and all other fastener types as per customer specification, including custom diameters, lengths, flange designs, and coatings. Share your drawing with our team, and we'll manufacture to your exact requirement.
For bulk orders, technical drawings, or grade selection guidance, get in touch with our team directly.
