Action screw countersink angle?

[alphapygmy]

I'm needing to make an action screw bushing for a Marlin XL7. They use the same action screws as Winchester Mdl 70's. I'm ordering a set of stainless screws from NECG. Anyone know the angle of the underside of the screws? Looks like 110 or 120 degrees but I don't know a way to accurately measure them and I'll need to countersink the bushing to the matching angle. Thanks

 

[Alex Wheeler]

Most screws are 82 degrees

 

[RWO]

Trying to measure the angle from computer generated pic is not too reliable, IMHO. My guess is the countersink angle is 90 deg. FWIW, Rem 700 and Savage screws are 90 deg. as close as I can measure. The ISO (Metric) standard is 90 deg. Aviation/aerospace screws use 100 deg. because they are often used to fasten thin metal. I think it is unlikely that the gun makers went too far afield with their screw specs.

RWO

 

[ab_bentley]

I'm needing to make an action screw bushing for a Marlin XL7. They use the same action screws as Winchester Mdl 70's. I'm ordering a set of stainless screws from NECG. Anyone know the angle of the underside of the screws? Looks like 110 or 120 degrees but I don't know a way to accurately measure them and I'll need to countersink the bushing to the matching angle. Thanks

82°. Adam

 

[alphapygmy]

I made some imprints in the clay I use for bedding and that made it much easier to measure the angles. Common hardware store screws were 82°, a Remington action screw I had laying around was 90° and the Winchesters were 120°. Once I made the imprints and layed them next to each other you could see there were definitely different angles for the 3 screws.