taps and dies

[new to this]

im looking to buy an imperial dies ,ive seen one that says 5/16'NF24, does that mean 5/16 UNF

dave

[pj-tigger]

Yes - NF=UNF NC=UNC ,24 is the threads per inch

[new to this]

thanks,

[73stagman]

Dave.... generaly we use UNF (unified national fine) as an imperial standard.. the 5/16 is the major diameter and the 24 is the threads per inch.
Usually in UNF threads the pitch is standardised.... but Some UNF threads, especially in the smaller sizes have varying pitches. So quite often for instance you will see 3/16 stated with its thread pitch rather than "UNF" because its where the thread pitch standard starts to go hay wire.
Some (especially USA stuff) engine parts come with a variety of UNF thread pitches which dont match any standard, for example some Holley carbs have a 9/16 UNF fine thread form....
So be careful when you buy a tap or die set... always try to buy High speed steel and avoid "High Carbon steel" (the cheap sets from Aldi are usualy high carbon steel.) and make sure you are getting the taps and dies you need.
Triumph cars use 3/16, 1/4, 5/16, 3/8, 7/16, and 1/2" fairly widely and the aluminium parts should have those threads in UNC (Unified National Coarse) by default. The fine threads are a lot weaker and therefore more likely to strip and get galled up in the softer alloys.

[GDPR]

If only they'd used UNC by default on the rear swing arms..... there would have been fewer rear hubs parting company on the road....

[milothedog]

im looking to buy an imperial dies ,ive seen one that says 5/16'NF24, does that mean 5/16 UNF

dave

24 TPI is standard for 5/16" UNF Dave, What are you tapping, something on the engine block



Ian.

[new to this]

24 TPI is standard for 5/16" UNF Dave, What are you tapping, something on the engine block



Ian.

ian

ive caught the stainless bug im replacing the seat to seat runners bolts,

dave

[73stagman]

If only they'd used UNC by default on the rear swing arms..... there would have been fewer rear hubs parting company on the road....

Correct. Just what was in the parts bin is not good design

[Goldstar]

ian

ive caught the stainless bug im replacing the seat to seat runners bolts,

dave

Dave, shouldn't you be using high tensile fixings in that area for safety?

Paul

[jleyton]

ian

ive caught the stainless bug im replacing the seat to seat runners bolts,

dave

Hi Dave,

Out of interest, where do you buy all your SS nuts and bolts ?

Cheers

Julian

[Stag therapy]

Julian

There is quite a selection here http://ccsfasteners.co.uk/index.php?...3e1fadbda308ac

[milothedog]

Hi Dave,

Out of interest, where do you buy all your SS nuts and bolts ?

Cheers

Julian

Hi Julian,

I have used this guy for all mine, very good service and for a small extra charge he will polish them and in the case of bolts sligthly dome the heads before polishing for a perfect finish. If you look at my albums (header tank) they are fitted to my carb elbows, bonnet hinges etc.

http://www.polished-stainless.com/

Ian

[jleyton]

Thanks guys,

Shortly after I got my Stag I bought a mixed package of SS nuts and bolts. They weren't a bad price but I can't remember where I got them from

I've been looking round recently and the places I've seen are not cheap so thanks for those suggestions - I'll check them out.

Cheers

Julian

[73stagman]

Dave, shouldn't you be using high tensile fixings in that area for safety?

Paul

Yes he should be!

[jleyton]

Dave, shouldn't you be using high tensile fixings in that area for safety?

Paul

Are the original bolts high tensile ?

Cheers

Julian