Hex Pole Pieces

[David Schwab]

Turns out they are 4037.

Well that's probably what you are going to find if you use screws for poles. 4037 or 8740 alloy steel is the most common. Screws are made to be strong.

And that's probably the same alloy in all the hex screw pole pickups.

[Joe Gwinn]

Well that's probably what you are going to find if you use screws for poles. 4037 or 8740 alloy steel is the most common. Screws are made to be strong.

And that's probably the same alloy in all the hex screw pole pickups.

Setscrews and hex socket cap screws (which use a hex key) are made of 4037 or 8740 or the like, while hex cap screws (which use a socket wrench) and bolts are made of lesser alloys. Grade 8 is the highest alloy, Grade 5 is in the middle, and Grade 3 (roughly what you get if no grade is specified) is mild steel, maybe 1020.

[David King]

If you go the custom route, then go for soft magnetic stainless as used in solenoids etc.