A1: DIN 935 specifies the dimensions and requirements for Hexagon Slotted Castle Nuts. These are specialized locknuts characterized by a castellated (crowned and slotted) top section. They are designed to be used in conjunction with a cotter pin or split pin to create a positive mechanical lock. After the nut is tightened to the desired position, a pin is inserted through the aligned slots in the nut and a pre-drilled cross-hole in the bolt or stud, preventing any rotation or loosening.
A2: The internationally recognized equivalent standard is ISO 7035 for hexagon slotted nuts (castle nuts).
A3: Castle nuts are a classic, reusable locking solution for applications requiring reliable, visual security against loosening.
Primary Application: They are ideally suited for securing rotating or pivoting components subjected to mild to moderate vibration, where a positive lock is critical for safety. Common uses include:
Wheel assemblies on carts, trailers, and light-duty axles.
Kingpins and linkage assemblies.
Agricultural equipment and other machinery where components rotate.
Key Advantage & Locking Principle: The mechanical interlock provided by the cotter pin makes the fastening highly resistant to loosening, even if the nut's preload is partially lost. This offers a clear visual confirmation that the assembly is secured.
Critical Limitations:
Not for High Vibration: They are not recommended for parts exposed to sustained high vibration or shock loads, as the cotter pin can shear under prolonged cyclic stress.
Requires a Pre-drilled Bolt: The mating bolt or stud must have a transverse hole drilled through its threaded section to accept the pin.
Cotter Pin is a Consumable: The nut is reusable, but the cotter pin must be replaced every time it is removed, as bending it compromises its integrity.
Castle nuts are commonly available in medium and high-strength carbon steel (e.g., Grade 5/8 or Grade 8/10) with zinc plating for corrosion protection. Stainless steel versions are also available for corrosive environments. It is crucial to match the nut's strength grade with that of the bolt.
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| PIC | PRODUCT | SIZE | GRADE | FINISH | THREAD |
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Castle Nuts (DIN 935) - Stainless Steel (A2) | M5-M36 | A2 Grade | Natural | Coarse |
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Castle Nuts (DIN 935) - Marine Stainless Steel (A4) | M5-M36 | A4 Grade | Natural | Coarse |
|
Hexagon slotted and castle nut DIN 935-1 Steel Zinc plated 8 | M5-M36 | Class 8 | Zinc plated | Coarse |
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Hexagon slotted and castle nut DIN 935-1 Steel Zinc plated 10 | M5-M36 | Class 10 | Zinc plated | Coarse |