1

Notice this thing,

enter image description here

for a 30mm ...

enter image description here

What is the tool to tighten that properly?

It would seem to be best if it was a long tube-like thing you slid down from the top and tightened, but, maybe there's a thing that grabs it from the side?

(And, what's that type of bolt known as?!)

  • Interestingly I only learned what a pin wrench is thanks to this fantastic site! diy.stackexchange.com/a/136621/79954 . But this thing is different, a pin wrench does not do the job it seems. – Fattie Nov 23 '18 at 6:22
  • If I only have to do it a couple times the appropriate tools are a vise, a hammer, and two screwdrivers or sturdy metal rods. – Wayfaring Stranger Nov 24 '18 at 1:50
  • 1
    Right! No, it needs to be done repeatedly .. – Fattie Nov 24 '18 at 2:42
4

A hook wrench (as used on bicycles)

https://bicycles.stackexchange.com/questions/16291/what-tool-is-needed-to-adjust-this-headset-on-a-childrens-bike

enter image description here

  • 1
    I have adjustable or jointed ones also that allows for a larger range of nuts , I thought the name was broke spanner, but that's just a Nick name we use at work. – Ed Beal Nov 23 '18 at 15:47
  • A hook wrench !! fantastic ! – Fattie Nov 24 '18 at 2:43
  • "broke spanner" great name :) – Jasen Nov 24 '18 at 4:40
  • @Jasen thanks again. My "thing" there is a "30mm" one. Meaning the exact diameter of the "pole" is 30mm. I guess then the outside diameter of the four-notch bolt is perhaps 35-40 mm. (I'll measure it.) In fact, do you reckon I need a "30" size hook wrench, or do I need a "40" size hook wrench ?! I wonder how they measure that? Again thanks! – Fattie Nov 24 '18 at 6:43
  • not my field of expertise, but I would immagine it's by the outer diameter of the ring-nut so 40. – Jasen Nov 24 '18 at 10:03
2

It is called a four pin spanner socket. Finding one the correct size may be difficult. I would try a local tool supplier with a liberal return policy so if you select the wrong one you can exchange it. There are standard sizes but I have run into some specialty sizes (correct diameter but wrong pin size) issues. If you are handy with a die grinder you can modify a standard socket by cutting notches it. I have also fabricated one from a standard socket by welding pieces of key stock to the outside of the socket.

  • he has the nut detached in image one, he could take it in to the shop. – Jasen Nov 24 '18 at 4:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.