1/4 3/8 B8 B8M B8T ASTM A453 12 Point Flange Head Bolt High Quality Customizable

These precision-engineered 12-point flange bolts are available in the popular imperial sizes of 1/4" and 3/8", manufactured from a selection of premium materials conforming to the exacting ASTM A453 standard. The available material grades—B8 (Class 1), B8M (Class 1), and B8T (Class 1)—are derived from austenitic stainless steel alloys (typically 304, 316, and 321 respectively) and undergo a carbide solution treatment process to optimize their mechanical properties for elevated temperature service. The defining feature is the robust 12-point flange head, which provides a low-profile, high-strength drive system capable of transmitting the significant preloads required for pressure-containing and critical structural joints. Offered as a high-quality, customizable solution, these bolts can be tailored in terms of length, thread configuration, and packaging to meet specific project or OEM requirements, ensuring a perfect fit for demanding applications where off-the-shelf solutions fall short.

The imperial sizes make them particularly suitable for North American and other markets where inch-series fasteners are standard for critical infrastructure. Common applications include securing turbine casings, valve bonnets, heat exchanger covers, and high-pressure piping flanges in refineries and chemical plants. The choice of alloy allows for precise material compatibility:

The primary advantage is strict compliance with the ASTM A453 specification, providing assurance of material integrity, traceability, and mechanical performance for mission-critical high-temperature applications. The availability of three distinct alloy grades (B8, B8M, B8T) empowers engineers to select the optimal material for their specific chemical and thermal environment, preventing premature failure from corrosion or sensitization. The 12-point flange head design offers a compact, high-strength drive system that accommodates the high torques needed to properly seal critical flanges and maintain joint integrity under thermal cycling. Being available in 1/4" and 3/8" imperial sizes caters to established industry standards in key markets. Finally, the high-quality, customizable nature of these bolts means they are not just standard parts; they can be engineered to meet unique project specifications, ensuring a precise fit and optimal performance for specialized equipment and demanding operational conditions.