Common Technical Name for Spring Release Pin

[Josh11]

Does anyone know what the common technical name for the attached image of a spring loaded pin? I am pretty sure it is on the market, but not sure what it is called. Maybe you have used them before.

*Note: This is similar to some scaffold clamps, but it is spring loaded, while some scaffold clamps are gravity activated.

 

[pantaz]

I haven't seen that particular style, but here are a couple of possible sources.
http://www.reidsupply.com/products/fasteners-hardware/quick-release-pins-accessories/
http://www.mcmaster.com/#standard-quick-release-pins/=maql39