BS A 299:1989 - Specification for procurement of alloy steel protruding head bolts with strength classification 1 250 MPa and MJ threads
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BS A 299:1989 is a British Standard specification that provides requirements for the procurement of alloy steel protruding head bolts with a strength classification of 1,250 MPa and MJ threads.
Here's an overview of what this specification likely covers:
Material Specifications: Detailed requirements for the alloy steel used in the manufacturing of protruding head bolts. This includes specifications for the chemical composition, mechanical properties, and heat treatment of the steel to ensure it meets the desired strength and performance standards.
Strength Classification: Specifications for the strength classification of the bolts, which in this case is 1,250 MPa. This indicates the minimum tensile strength of the bolts, ensuring they are suitable for applications requiring high-strength fasteners.
Thread Specifications: Guidelines for the MJ (Modified J) threads used in the bolts. This includes specifications for the thread geometry, dimensions, and tolerances to ensure proper fit and compatibility with mating parts.
Protruding Head Design: Requirements for the design and dimensions of the protruding heads of the bolts. This may include specifications for head diameter, height, and shape to ensure proper engagement with mating components.
Surface Finish and Coating: Requirements for the surface finish and protective coatings applied to the bolts to enhance their durability and resistance to corrosion and other environmental factors.
Quality Assurance: Standards for quality control and assurance processes to be implemented during the manufacturing and procurement of the bolts. This ensures that the bolts meet the specified requirements and standards for strength, dimensions, and surface finish.
