Double coil spring cotter pin | A4 | M8378
Do you need a spring cotter pin that performs reliably even in damp, salty, or chemically demanding environments? The double ring spring cotter pin in A4 stainless steel (AISI 316 acid-proof) is built to withstand corrosion and maintain its strength over a long period. It combines low weight with high breaking strength and is optimized to withstand heavy mechanical load as well as frequent disassembly and assembly.
AREA OF USE
Perfect for fast and secure fastening of bolts, shafts, pipes, and machine parts in coastal areas and marine applications, on docks and boats, within the food industry and chemical plants, as well as in the machine and automotive industry where vibration-proof locking is required. The spring-loaded double ring provides a stable and vibration-proof connection without the need for extra fittings. Easy to install by hand, completely without tools, and requires minimal maintenance even during continuous operation.
TECHNICAL SPECIFICATIONS
Product type: Double ring spring cotter pin
Standard: DIN 11024
Grade: A4 (AISI 316 acid-proof)
Material class: Not specified (depending on dimension, breaking limit can be specified if needed)
Thread type: Not applicable
Surface treatment: Untreated (natural-colored stainless steel)
Head shape: Double ring (spring loop)
Grip type: Not applicable
FREQUENTLY ASKED QUESTIONS (FAQ)
What is the advantage of a double spring cotter pin compared to a single model?
The double loop/ring provides higher spring force and a significantly more secure grip around the shaft. This drastically reduces the risk of the pin twisting, sliding out of position, or being accidentally disengaged during heavy vibrations, impacts, or if lines and nets get caught in it.
Why should one choose the spring cotter pin in acid-proof A4 / AISI 316?
A4 steel (AISI 316 / 1.4401) contains molybdenum, which provides superior corrosion protection against salt water, road salt, and chemically aggressive environments. Unlike standard steel or A2 pins, the A4 material does not rust in marine environments, which means the pin maintains its resilience and spring-locking function without weakening or seizing.
Can the spring cotter pin be reused?
Yes, the design of the spring cotter pin allows it to be easily pushed on and pulled off entirely without tools, over and over again. This makes it a much more flexible and economical alternative to a one-time-use split pin for applications where you need to assemble and disassemble connections frequently (e.g., on rigging bolts, boat trailers, or marine equipment).