Engineered for Load and Built for Precision.

With 37 years of hands-on experience, our team at Mr Bolt and Nut knows what it takes to deliver bespoke solutions engineers can trust.

So when the job calls for extreme durability, precision alignment, and reliability under serious pressure, we know generic fasteners won’t cut it.

Meet our custom-machined M42 shoulder bolts, manufactured to Grade 8.8 standards. Definitely not your average stock bolts. These are purpose-built mechanical solutions.

• Heavy Duty Performance
  A massive 42mm shoulder diameter designed to absorb extreme shear, axial forces, and bending loads
• Tight Tolerances, Smooth Operation
  Machined to ±0.005mm precision, ensuring a perfect fit for rotating joints, bearing surfaces, and critical alignments
• Stress-Resistant by Design
  Radiused undercuts, cold-rolled threads, and carefully heat-treated steel provide high resistance to fatigue. Built to last
• Corrosion Protection
  Finished in black oxide for protection that doesn’t compromise tolerances and provides a clean, professional look

 Made for the jobs where close enough is not good enough

• Ideal for use in
• Heavy equipment and industrial machinery
• Automated manufacturing systems
• Jigs, fixtures and tool assemblies
• Precision mechanical structures

Have a Spec? We’ll Match It
From prototype to production, our team will custom-manufacture shoulder bolts or any special fastener to your exact requirements, including size, material, tolerance, and finish. Get in touch with our team to discuss your requirements or request a quote. Contact us: sales@mrboltandnut.co.za