ANSI/ASME B1.1 Inch Threaded Fasteners – Manufactured by BigBoltNut

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At BigBoltNut, we specialize in manufacturing high-performance ASME B1.1 fasteners (also known as ANSI B1.1). This Unified Inch Screw Thread Standard plays a crucial role in ensuring precision, compatibility, and strength across a wide range of industrial applications.

What is ASME B1.1?

ASME B1.1 is a unified screw thread standard based on inch dimensions. It defines thread shapes, series, classes, tolerances, and allowances to ensure seamless compatibility and performance in mechanical assemblies. This standard is essential for industries requiring precision-engineered screw threads.

Key Thread Series Under ASME B1.1

1.UN (Unified National) – Standard internal and external thread profiles.

2.Unified National Rounded Root – Features a rounded root for increased fatigue resistance.

3.UNJ Series – Designed for high-stress environments with an enlarged root radius for improved fatigue strength.

Thread Series Applications

UNC (Unified National Coarse) – Suitable for general industrial applications and similar to ISO metric threads.

UNF (Unified National Fine) – Higher thread count, ideal for applications requiring increased tensile stress areas.

ASME Thread Fit Classes

•Class 1A/1B – Loose fit, allows for easy assembly even with minor thread damage.

Class 2A/2B – Most commonly used; offers a balance between performance and ease of installation.

Class 3A/3B – Not suitable for applications requiring precision tolerance.

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BigBoltNut – ASME B1.1-Compliant Fastener Solutions

We produce a wide range of ASME B1.1 threaded fasteners that meet stringent dimensional and quality standards:

Stud Bolts – Available in full thread, double-ended, and reduced shank designs. Made from carbon steel, alloy steel (Grades 8.8, 10.9, 12.9), and stainless steel (SS304, SS316, SS316L, B8, B7, L7, 8M, and more).

Hex Head Bolts & Screws – Conforming to ASME B18.2.1 specifications.

Nuts and Washers – Manufactured to ensure complete ASME compatibility with our bolt range.

Contact BigBoltNut for bulk export inquiries and reliable ANSI/ASME B1.1 threaded fasteners engineered for high-performance applications across the globe.

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