Quote:
Originally Posted by Oldporsche
I have found a couple of types of roll pins present in the pedal cluster. The first one is a European design which is a continuous roll of spring steel. Sometime it appears as a solid pin due to corrosion. The next is the common one found in the hardware store is a thick walled single layered tube with an expansion slit running lengthwise.
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In the UK
Type 1 is normally called a 'Coiled Spring Pin' but as you say can be called a Roll Pin.
Type 2 can be called a Slotted Spring Pin but more commonly sold as a SELOC pin and unhappily also called a Roll Pin.
They do have a subtly different duty.
When Coiled Pins are installed, the compression starts at the outer edge and moves through the coils toward the centre and spread compressive stress over the entire pin they do not have stress point concentrations.
Slotted Pins compress by closing the slot, and stress is concentrated 180 degrees opposite the slot. This embedded stress at installation, combined with the concentration of stress during the assembly’s life reduces the fatigue life of the Slotted Pin potentially causing earlier failure.
In this application it shouldn't make any difference but there are cases where the pin type shouldn't be changed.