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Why would 5mm shelf pins have a "bulge" in them that make them hard to use?

6/12/19       
Matt

Good day folks,

I'm asking this question directly to Richelieu but I'm also wanting to ask you guys. Can anyone say specifically why a manufacturer would make these shelf pins with an intentional step-up in the pin diameter right near the edge of the plate?

If you look at the CAD drawing (uploaded here but also in that link below), these have an intentional step-up from 4.9mm to 5.25mm right near where the pin would settle into it's "fully inserted" position.

We bought a pile of these unwittingly thinking they were the same as every other 5mm shelf pin we've ever seen and have been scratching our heads as to why we have such a ridiculous time getting these pins to seat in place.

Admittedly their CAD drawing shows this step-up, we just didn't notice it. I would have never thought in a million years to look at a CAD drawing for a simple angled shelf pin. So mainly out of curiosity we'd like to know why that step-up is even there. It makes the shelf pin hard as hell to insert.

https://www.richelieu.com/us/en/category/furniture-equipment/furniture-
shelf-pins/metal-shelf-pin/angle-metal-shelf-clip/1015308/sku-5834180


View higher quality, full size image (1008 X 854)

6/12/19       #2: Why would 5mm shelf pins have a &qu ...
Dan

They're not 5mm. 7/32" is closer if you don't want to tap them in.

6/13/19       #3: Why would 5mm shelf pins have a &qu ...
DS

It seems logical to me, frankly I'm surprised they put this much thought into a shelf pin.
Slightly less diameter to make it easier to initially place into the hole, and broader as it goes in to help seat it into place. If you were to try an insert a 5mm pin into a 5mm hole in metal, the reasoning would be much more evident.

6/13/19       #4: Why would 5mm shelf pins have a &qu ...
Matt

Dan, those are definitely sold as 5mm shelf pins, not 7/32".

DS, I agree that I'm also surprised they put that much thought into it, but my experience has been that these really are only a good product for use on plywood. If you try to shove these pins into Melamine casework, it's far more difficult than it should be. Usually we require a mallet to tap them in, and the end-user is definitely not going to like that when they buy the jumbo size box of Rice Crispies that won't fit between the shelves.

I've never found these angled shelf pins (with straight 4.9mm pegs) to have ever been insufficient. That 5.25 stepup just seems like a solution to a problem that doesn't exist, causing problems that require a solution that ends up being "buy someone else's product".

6/13/19       #5: Why would 5mm shelf pins have a &qu ...
Dan

Sorry, I was being lazy and giving short response.
We received some of these by accident once and concluded that they will not go into 5 mm hole without strain.
The pin is a variation within a series of "L-shaped" shelf supports, many of which are "sleeved".
This one gets its 20kilo/shelf (vs 15) rating by being oversized but needs to be forced into a 5 mm hole making it not very suitable for adjustment by an end user.
I think if you called Richelieu on the 5mm part they'll say "you just need to tap them in". We took them back.

6/14/19       #6: Why would 5mm shelf pins have a &qu ...
Alan F. Member

It looks like they sent you pins designed for 1/4" holes.
I guess there is a demand for 1/4" holes for people that don't have metric tooling.

Angle Metal Shelf Clip

6/14/19       #7: Why would 5mm shelf pins have a &qu ...
Gerry

They sold 2 versions of this same support with 5mm pin at 1 time and they required different clearance allowances. It is a very poor design and they do not allow the angle to sit tight against the cabinet gable.

They are a 5mm pin but there is a shoulder on the pin against the plate that prevents the pin from going in all the way. It looks like the pin is pressed into a dye after insertion in the angle bringing it to final dimension and leaving a shoulder to prevent it from backing out of the hole?


View higher quality, full size image (1280 X 1024)

6/14/19       #8: Why would 5mm shelf pins have a &qu ...
Gerry

Here is another version showing the shoulder more clearly.


View higher quality, full size image (1280 X 1024)

6/17/19       #9: Why would 5mm shelf pins have a &qu ...
Matt

Dan, thanks for your reply. I'm glad to know I'm not the only one that thinks this isn't a good idea.

Gerry, you may be onto something. That shoulder may be exactly what you're talking about---- where the peg is pressed into the angle bracket, holding it in place.

I appreciate everyone's help. I'm surprised I've not encountered this sort of thing before, it seems to be more common than I would have predicted. I'm being told Richelieu doesn't even sell an "angle bracket" type shelf pin that doesn't have this collar. They have plenty of spoons and plenty of plastic/metal pin hybrids but not the angle bracket style.


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