Materials
Alloy Steel: ISO 898-2 Property Class 10 and 12
ISO 898-2 Property Class 10
Material:
Typically manufactured from medium-carbon or alloy steels that are heat treated to achieve the required proof load.
Commonly used with Class 10.9 bolts and studs.
Mechanical Properties:
Designed to withstand the proof loads generated by high-strength bolting assemblies.
High resistance to thread stripping and deformation under load.
Provides reliable clamping force retention in demanding applications.
Corrosion Resistance:
Limited inherent corrosion resistance.
Commonly supplied with zinc plating, mechanical galvanizing, phosphate coatings, or other protective finishes.
Manufacturing Considerations:
Manufactured through cold forming or machining, followed by heat treatment.
Internal threads are precision produced to ensure proper load distribution and fit.
Requires controlled hardness and proof load testing to meet specification requirements.
Applications in Fasteners & Components:
Structural steel connections.
Industrial machinery and equipment.
Automotive and transportation assemblies.
Construction, mining, and heavy equipment applications.
ISO 898-2 Property Class 12
Material:
Typically manufactured from high-strength alloy steels with carefully controlled chemistry and heat treatment.
Intended for use with Class 12.9 bolts and studs in critical applications.
Mechanical Properties:
Higher proof load capacity than Class 10 nuts.
Excellent resistance to thread deformation under extreme preload conditions.
Designed for the highest-strength bolted joints covered by ISO standards.
Corrosion Resistance:
Similar to other alloy steel fasteners and typically requires protective coatings.
Coating processes must be controlled to minimize hydrogen embrittlement risks.
Manufacturing Considerations:
Requires tighter process controls and heat treatment than Class 10 nuts.
Precision thread manufacturing is critical to ensure proper engagement with Class 12.9 fasteners.
Often subject to rigorous inspection and quality verification.
Applications in Fasteners & Components:
Heavy-duty industrial machinery.
Mining and energy equipment.
High-performance automotive and motorsports applications.
Critical bolted joints requiring maximum clamp load capacity.
Key Takeaway for Engineered Fasteners
Class 10 Nuts → Designed to match the performance requirements of Class 10.9 bolts, providing reliable thread strength and proof load capability.
Class 12 Nuts → Designed for Class 12.9 bolts, offering the highest strength level commonly used in ISO bolted assemblies.
Relationship to Engineered Fasteners
Unlike bolt property classes, nut property classes are based primarily on proof load performance rather than tensile strength. The purpose of a Class 10 or Class 12 nut is to ensure that the nut remains structurally sound and does not strip or deform before the corresponding high-strength bolt reaches its intended preload.
For engineered fastener applications, Class 10 nuts are commonly paired with Class 10.9 bolts, while Class 12 nuts are specified when using Class 12.9 bolts in highly loaded assemblies where joint integrity is critical.
Materials
BRASS
BRONZE
COPPER
PH STAINLESS STEEL
DOING WHATEVER IT TAKES
Putting Manufacturing Exellence Into Practice
The manufacturing processes, testing capabilities, and quality systems featured throughout WN Global support the production of critical components and engineered fastening solutions across demanding industries. Connect with our team to learn how our manufacturing capabilities can support your project requirements.
