Gauge Protrusion for Tikka T3/T3x

[urbanrifleman]

Anyone have a tenon print or know the gauge protrusion for T3?

 

[fmshooter]

Brad, is this something you can measure from a receiver or barrel? And if so, would it help if I sent you one of my spares?

 

[Skattergun]

Factory take off barrel measures as follows
Tenon length .985
Go gauge protrusion .136
1”-16tpi major diameter .995
Pitch diameter .956

 

[urbanrifleman]

Factory take off barrel measures as follows
Tenon length .985
Go gauge protrusion .136
1”-16tpi major diameter .995
Pitch diameter .956

Very interesting!! Thank you!!

 

[urbanrifleman]

Brad, is this something you can measure from a receiver or barrel? And if so, would it help if I sent you one of my spares?

I have checked two sources and the number is .130" to .135".

I will be ready to make one as soon as I get my barrel nut.

 

[Keith Kilby]

I've done 4 T3s now and I didn't keep track of gauge protrusion but all were within 0.001" for headspace.....receiver face to bolt face. Number I get for that is 1.123" +/- 0.001". My tenon diameter and length are slightly bigger numbers than take off barrel measurements. My diameter is 0.997" and length is 0.988" which allows 0.010" clearance between breech face and end of bolt. These numbers have been very consistent for all 4 I have done.
Keith

 

[tobnpr]

OP is using a barrel nut- gage protrusion isn't critical.

 

[urbanrifleman]

I've done 4 T3s now and I didn't keep track of gauge protrusion but all were within 0.001" for headspace.....receiver face to bolt face. Number I get for that is 1.123" +/- 0.001". My tenon diameter and length are slightly bigger numbers than take off barrel measurements. My diameter is 0.997" and length is 0.988" which allows 0.010" clearance between breech face and end of bolt. These numbers have been very consistent for all 4 I have done.
Keith

So your headspace gauge protrusion is 1.123" minus .988". If I understand correctly.

.135".

It also appears the Tikka T3x holds headspace from action to action ?

 

[Keith Kilby]

That's what the math says. I have never measured the gauge protrusion. I have had all 4 actions in hand and they were not set up for a nut. All the measurements for tenon and headspace have been nearly identical from action to action. If you used less gap from bolt to breech it's still in range you listed previously. All the ones I've done have been for field/varmint use and I didn't want bolt to be any closer to breech face.

 

[tobnpr]

You're doing a variable shoulder prefit with nut.
You won't have a shouldered tenon- you're threading the end of the barrel which has to be the major thread diameter at the breech end, and the threads need to be considerably longer than the shouldered tenon to allow for the barrel nut.

This is apples and oranges comparing a shouldered barrel and a nutted prefit when discussing certain dimensions.

No different than a Savage. Measure depth from end of boltnose to boltface. Less 5 to 10 thou for clearance from boltnose to breech- that's your gage protrusion.

 

[urbanrifleman]

You're doing a variable shoulder prefit with nut.
You won't have a shouldered tenon- you're threading the end of the barrel which has to be the major thread diameter at the breech end, and the threads need to be considerably longer than the shouldered tenon to allow for the barrel nut.

This is apples and oranges comparing a shouldered barrel and a nutted prefit when discussing certain dimensions.

No different than a Savage. Measure depth from end of boltnose to boltface. Add 5 to 10 thou for clearance from boltnose to breech- that's your gage protrusion.

Kind of hard to do without an action bro! That's why I asked...

 

[SKWERLZ]

Kind of hard to do without an action bro! That's why I asked...

If I didn’t have or wasn’t very familiar with the action I’d measure from base of cartridge your chambering for to back of extraction grove then subtract 5-10 thou because of the chamfer on barrel.
that way you shouldn’t get hosed by a proud extractor or boltface protrusion.