What thread pitch on carb screws?

[BINOVC]

I'm thinking about replacing the float bowl and slide cover screws with stainless steel socket head screws.  The parts fiche lists the diameter and length but not the thread pitch:
Float chamber: 5x16
Slide cover:  4x18
It looks like the M5 screws are available in .5 (fine) and .8 (coarse).
The M4's are either .5 (fine) or .7 (coarse).
Anyone know the pitch?
Thanks!

[Ricky-D]

I understand this won't change your mind, but I'm going to tell you this anyways so you know.

The carburetor float bowl screws are a very special screw that Honda, in their wisdom, makes just for the float bowls.

The screws are made of an especially soft metal composition so that, in a case of over tightening the screw, the screw will strip

and not the threads in the carburetor body which holds the float bowl.

It's a very expensive proposition to replace the carburetor body.

The little screws are cheap when compared.

[The emperor has no clothes]

I understand this won't change your mind, but I'm going to tell you this anyways so you know.

The carburetor float bowl screws are a very special screw that Honda, in their wisdom, makes just for the float bowls.

The screws are made of an especially soft metal composition so that, in a case of over tightening the screw, the screw will strip

and not the threads in the carburetor body which holds the float bowl.

It's a very expensive proposition to replace the carburetor body.

The little screws are cheap when compared.

when did steel screws become softer than aluminum carburetors ?

[steveB (VRCC UK)]

I've used them on carb rebuilds and they give a nice tidy look. Take on board what Ricky-D says and don't brute them up, just snug. Used M4 x 0.7 & M5 x 0.8 suggest you try for size and use copper grease.

[WintrSol]

when did steel screws become softer than aluminum carburetors ?

One of the reasons people think Honda's screws are too soft is they use a Phillip's screwdriver, and bugger the heads. I've never damaged one using the proper 'JIS' type screwdriver in them. I'd never heard the screws were softer than aluminum before.

[98valk]

0.8 thd

[BINOVC]

Thanks all.  Note I read (on McMaster-Carr website) says that if the pitch is not stated, then it is most likely a coarse thread (M5x.8, M4x.7).

[6adan]

  For anyone that has striped threads there is a product called a Time-Sert that works great for repairing the carbs.

[h13man]

  For anyone that has striped threads there is a product called a Time-Sert that works great for repairing the carbs.

A excellent insert for sure given you have wall thickness to use them thus HeliCoil come into play but not my favorite to use. You can also make a insert out of a set screw using Loctite to keep in place or "staking" it in similar to the Time-Sert method.