Call Toll Free : 800.862.ACME(2263)Email: keystone@keystonethreaded.com

Manufacturer of a Complete Line of Quality Roll Threaded Products

Keystone Threaded Products | The Acme Threading Specialists

Frequently Asked Questions

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Custom Roll Threaded Services
Custom Roll Threaded Services

Q: What is the difference between a rolled chamfer and a machine chamfer?
A: A machined chamfer is a mechanically created chamfer produced by means of a secondary operation. A 30° axial (60° included angle) measured below the minor diameter of the bar is produced. A rolled chamfer is created during the process of roll threading bars. It results in a good starting thread, but creates no measurable angle.


Q: Can you supply Grade 8 threaded bars?
A: Keystone does not supply Grade 8 threaded material. The hardness of Grade 8 exceeds the maximum hardness for our machine capabilities.

Q: What is Keyalloy?
A: Keyalloy is the trademarked name that Keystone uses for our alloy heat treated roll threaded bars. Keyalloy is a 4140 alloy steel heat treated to the requirements of ASTM A193 / ASME SA 193 Grade B7, latest revision.

Q: Do you supply Hot Dip Galvanized products?
A: Hot Dip Galvanized bars are only available in products up to three feet in length. We do not stock any bars that are Hot Dip Galvanized, therefore a minimum plating charge would incur on all special orders.