Help identifying this mystery fastner

[letteripp]

I have several of these on my shelf, been there for years. Anyone know what they are? Thanks in advance for your help (the top reminds me of a plow bolt)

 

[mikester]

spring loaded?

 

[oosik]

For sure - some quite exotic and expensive type fasteners. Could be used most any place where you attach equipment. 3-point, FEL attachment pins. Would require countersink anywhere they could be used.

JMHO - they came with some very specific/specialized piece of equipment.

 

[bcp]

About the same head shape.

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[dstig1]

Spring loaded retainer pin. Specifically for what, I have no idea...

 

[letteripp]

spring loaded?

Nope. Not spring loaded

 

[CliffordK]

I can't tell what the top of the pin looks like. Is it slotted for a screw driver?

Perhaps some kind of hidden fastener like is used in furniture.