Stainless steel shear nuts are normally used where corrosion resistance is just as important as tamper protection.
They are most commonly available in two primary grades of austenitic stainless steel, which differ mainly in their environmental resilience.
Key Material Grades
A2 Stainless Steel (Type 304): This is the standard "industrial" grade. It offers excellent durability for general outdoor environments like fencing and garden structures.
A4 Stainless Steel (Type 316): Known as "Marine Grade," this steel contains molybdenum, which provides superior resistance to saltwater, salt spray, and harsh chemicals. It is essential for coastal projects or industrial chemical sites.
Mechanical Performance
Stainless steel shear nuts are designed with a specific "break point" where the hexagonal head snaps off. Because stainless steel is relatively soft compared to high-tensile carbon steel, it provides a clean, predictable shear.
Size
Material Grade
Typical Breaking Point (Nm)
M6
A2-70
8.5 – 10 Nm
M8
A2-70
20 – 25 Nm
M10
A2-70
40 – 50 Nm
M12
A4-70
54 – 88 Nm
Installation & Removal Tips
Galling Prevention: Stainless steel threads have a tendency to "gall" or cold-weld during tightening. To prevent the nut from seizing before the head shears off, tighten with low RPMs and use a dry-film lubricant if allowed by the project specs.
Permanent Fixing: Once the hex head breaks, you are left with a smooth, conical collar that cannot be gripped by spanners.
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