4mm x 35mm Alloy Steel Class 12.9 Shoulder Bolts, 10 Pack

The minimum ultimate tensile strength of the Grade 12.9 Metric Bolts is about 1242 Mpa or 180,000 PSI, making them the highest grade of bolts produced.

These bolts are a major upgrade compared to the common stainless steel ones you’ll find in this size. They had to be custom ordered in batches of at least 500 as this length is a bit unusual, but the cost is well worth it! These should be about 2.5 times stronger than stainless steel. CAD Here.

These shoulder bolts have a precision ground bearing surface hardened to 39-44 HRC and are perfect for use with 4mm inner diameter bushings, bearings, and more.

• Shoulder Diameter: 4mm (actual 3.95-3.98mm)
• Shoulder Length: 35mm
• Shoulder Surface Roughness: 0.8 micro-meter (32 micro-inch) Ra
• Head Diameter: 7mm max, 6.78mm min
• Head Height 3.5mm max
• Thread: M3x0.5, 6mm length max
• Drive: 3mm Hex
• Weight: ~4.4g (0.156oz) each