#9018 Type III Square GO / NO-GO Ring Gages

The #9018 Type III Square GO / NO-GO Ring Gage is a precision inspection tool designed to verify dimensional conformity of Type III square drive driver bits and screwdrivers.

Manufactured in accordance with ASME B18.6.3 and B18.6.5M standards, the 9018 Series provides functional GO and NO-GO verification for square drive tools used in production and assembly environments.

Square drive systems require accurate driver geometry to ensure proper engagement, torque transfer, and assembly performance. Improper driver dimensions can cause fastener damage, cam-out, or inconsistent torque results.

The 9018 Series verifies driver conformity through precision ground GO and NO-GO openings.

Available sizes:

9018-00 – Size 00

9018-0 – Size 0

9018-1 – Size 1

9018-2 – Size 2

9018-3 – Size 3

9018-4 – Size 4

The GO side confirms acceptable minimum dimensional conformity.The NO-GO side verifies the driver does not exceed maximum allowable tolerances.

The 9018 Series is ideal for:

• Driver bit manufacturers

• Industrial fastener producers

• Construction hardware suppliers

• OEM assembly operations• Quality inspection laboratories

All ring gages are heat treated, thermally stabilized, and surface treated to maximize wear resistance and extend gage life.

Long form calibration certificates provide dimensional verification and traceability to the National Institute of Standards and Technology, NIST.

The 9018 Series ensures reliable GO / NO-GO verification of Type III square drive tools in compliance with ASME standards.