Odd screw

[CBassB]

Hi All,

I've read the forum with much attention, but it is the first time I have to ask a question myself.

I came across an odd screw head on a motor. I have a drawer full of tamper proof drivers but this one has me puzzled. Does anyone have an idea what it's called or where to find a driver? It is recessed so it will be hard to get it with pliers or another tool, I would love to find the proper driver.

Thanks for your help!

S

 

[WWheeler]

I thought I was about to read a unique tail tale.

 

[bob15]

It could be proprietary to the motor manufacturer. Who makes the motor?

 

[2oolhound]

From the pic it doesn't look like it unscrews. It looks like a type of expandable plug that expands when the center is banged in. One time use.

 

[MShaw]

It is an oval head screw like Trico used on their vacuum wiper motors. I have one I bought in 1960. They did make more sizes.

 

[larry_g]

I've seen some that smash a steel pipe to an oval shape that will fit the oval head.

lg
no neat sig line

 

[Granite80]

There is a symbol for ground nearby. Is this a damaged grounding stud?


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[L.Cheapo]

Cant tell how big it is by the pic. Looks similar in shape to the top of a shock.

 

[davethorik]

I ran across an 11/16-20 tap today at work. Now that is an odd screw. Also 1/2-32 And 1/4-40.

 

[OccupantRJ]

I ran across an 11/16-20 tap today at work. Now that is an odd screw. Also 1/2-32 And 1/4-40.

Nah, .767-27 is an odd thread, or a 5/16-27.

 

[Toolmaker65]

Dave,
Those sound like the old United States Standard (also called Seller's Threads). Those things are either ancient or were made for reproducing an ancient thread for an old machine part. That thread system was in use in the early 20th century before the unified thread system was developed - probably can find info on them in the early edition of Machinery's Handbook before the 1930's.

 

[mbshop]

If it has no bearing on the job I would leave it alone. You may regret messing with it.

 

[F124C]

^^ x2

AL.

 

[F124C]

Cant tell how big it is by the pic. Looks similar in shape to the top of a shock.

Can the OP measure it?
Agree, it looks like the top of a shock, for which there are sockets available.

It seems to sit proud of the surface, might it be an access or grease plug with a sealing ring or 'o' ring underneath? If so, it probably won't be very tight - try turning it with a small pliers (duckbill or similar).

AL.

 

[CBassB]

I guess I should have provided more details. This screw keeps together a motor housing. The screw is M5, so you can approximate the side of the head. I got 2 out of four out, but the last two are recessed and hard to access as you can see in the picture.

Funny timing this gentleman just posted this morning and it seems he is in the same situation, He described it as a reverse flat screw.

S

 

[Ign]

I keep those gimmicky "Gator" sockets around for such things. There are TWO sizes, but the larger one is harder to come by. Still, not sure it'd fit in the space pictured.

 

[MShaw]

Why not take an inexpensive extension or drive adapter, cut off the square with an abrasive wheel and grind an appropriate slot across the end?

 

[CBassB]

@MShaw I think you nailed it with the first post. That looks like what I want. Any markings on the socket? How would I track one down 58 years later?

Making one is also an idea but I have quite a few of these to service so I would love a proper tool.

S

 

[bob15]

Who makes the motor? Have you tried contacting them?

 

[CBassB]

Motor made by Hanning in Germany. They call it non serviceable, but I don’t believe in that.

S

 

[monkeyspanners]

Haha! That's exactly the same screw head I had trouble with yesterday, and that was a Hanning motor too.

 

[bob15]

Other than making your own socket, have you tried stopping in at an electric motor repair shop and showing them?

What do you think you will find behind it or why the desire to remove it?

 

[CBassB]

All the motor needs is new bearings, standard 6202Z, can easily do that myself if I can get it open. Stopping by a motor shop and asking is not a bad idea, but they’ll probably want to do the work for me. I’ll give it a try.

It seems that a shock socket is very similar, the smallest one I could find online is 5mm x 8mm oval, I’ll have to measure the screw to compare.

S

 

[Old Man Roger]

Center punch it and then drill the head off? Maybe once you have the motor apart, you can grab the rest of the bolt with vice grips.

 

[MShaw]

"@MShaw I think you nailed it with the first post. That looks like what I want. Any markings on the socket? How would I track one down 58 years later? "

It is a Snap on TM22A and the opening measures .190" X .135".

I have a SO industrial catalog from the mid 90s that does not show it.

Lots of luck.

 

[erswill]

OP its a double D socket

 

[manwithtools]

OP its a double D socket

Good job identifying that

 

[MShaw]

Here it is from Snap on:


Carburetor Adjustment Tools >Socket, Double "D" Carburetor Adjusting (3.5 mm across flats) ...

Description

• For 1978 and later GM® idle adjusting screw

• OD drive end is 7/16"

• Nickel-chrome finish

• 3.5 mm across flats (= .137". Looks right)

• 1/4" drive

• 13/16" long

 

[CBassB]

Great! Thank you guys! I’ll get myself one of those.

 

[6PTsocket]

There are double D drivers for the tamper resistant 2 cycle carbs on weed whackers and chain saws. They are all over ebay and Amazon, etc. They are little sets with, D, double D, 7, 21 or 22 spline, pacman, etc. Most shapes can be bought individually. Unfortunately, I don't know if the double D is the size you need. They are cheap. What is the width and length of your double D head, in mm.

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[Old Man Roger]

Here it is from Snap on:


Carburetor Adjustment Tools >Socket, Double "D" Carburetor Adjusting (3.5 mm across flats) ...

Description

• For 1978 and later GM® idle adjusting screw

• OD drive end is 7/16"

• Nickel-chrome finish

• 3.5 mm across flats (= .137". Looks right)

• 1/4" drive

• 13/16" long

The whole time this thread has been going I knew I had seen it before.. I haven't used my carb tool in years..lol

 

[CBassB]

I came across some of those kits on Amazon and I wondered if they’d be the right size. The one I have is 3.1mm across flats and 6.1mm in length. The specs for the snap on socket are 3.5mm between flats but they don’t advertise the length on their website, and the current one is a different model than what MShaw has.

S

 

[CBassB]

Does anyone have one of these kits they could measure?

Also, it looks like the shock absorber tool kits come with a 6.5mm one, but they don't advertise the distance between flats, it looks wider than 3.5mm

S

 

[454ragtop]

When I needed one of those I made one by squishing a short length of 1/4" steel brake line tubing, then forcing that into a spare 1/4 drive socket. Pretty sure I still have it and can probably get a pic tomorrow if needed.