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View Full Version : Identify These Pins...............



JoeLee
10-01-2013, 05:05 PM
A few days ago there was a thread started on split pins and roll pins. I found these today in the shop. They are neither as far as design goes. They have raised grooves running almost the entire length of the pin, three grooves placed 120 deg apart.
Similar to what you would get if you were to place a chisel on the pin running length wise and strike it with a hammer or drag a line in the pin with the tip of your lathe bit. The larger pin is .250 and the smaller ones are .188. The grooves raise the surface just enough to give an interference fit when tapped in a hole.
Is there a name for these pins?????

JL......................

http://i911.photobucket.com/albums/ac317/JoeLee09/Roll%20Pins/Image002_zpsa4673392.jpg (http://s911.photobucket.com/user/JoeLee09/media/Roll%20Pins/Image002_zpsa4673392.jpg.html)
http://i911.photobucket.com/albums/ac317/JoeLee09/Roll%20Pins/Image001_zps7a214979.jpg (http://s911.photobucket.com/user/JoeLee09/media/Roll%20Pins/Image001_zps7a214979.jpg.html)

Gary Paine
10-01-2013, 05:12 PM
In my Atlas owner manual and parts list, they are referred to as groove pins.

JoeLee
10-01-2013, 05:23 PM
Gary, that is interesting........ I just found them on McMasters web site and from what they list there is a difference of a couple thou on each end, so it's slightly tapered. They also have pins that are split just in the center, can't remember seeing anything like that either.

JL.........................

Mark McGrath
10-01-2013, 08:01 PM
We call them fluted pins.Not very common over here now for the last forty years.

Boucher
10-01-2013, 09:46 PM
They were known as Drive Pins 50 years ago when I first encountered them. At that time making the V groove was a proprietary process. They were used to secure the front bulkhead to the motor case on both the Sparrow and Shrike Missiles.

JoeLee
10-01-2013, 10:15 PM
They were known as Drive Pins 50 years ago when I first encountered them. At that time making the V groove was a proprietary process. They were used to secure the front bulkhead to the motor case on both the Sparrow and Shrike Missiles.
Interesting, I thought drive pins were those tiny little round headed spiral pins that were commonly used to fasten tags to machines and fixtures.
Like a spiral nail.

JL...............

RussZHC
10-01-2013, 10:20 PM
Not very common over here now for the last forty years

neat how stuff comes around again and again...general idea is very similar to very light duty plastic inserts meant for fastening items into concrete/tile/stone [I happen to use them for fastening things like mirrors, soap or towel dispensers in newly renovated washroom at work]

LKeithR
10-01-2013, 10:58 PM
They were known as Drive Pins 50 years ago when I first encountered them...

That's what I've always known them as. When you want to pin a couple parts together you drive in one of these--the material "raised" by putting in the grooves makes sure they stay tight and don't rattle out...