You must use a back flange to mount threaded hole wheels that is:

(1) Flat (unrelieved);

(2) Securely fastened and square to the spindle axis;

(3) Able to properly support the wheel.

[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050. WSR 15-23-086, § 296-807-18070, filed 11/17/15, effective 12/18/15. Statutory Authority: RCW 49.17.010, [49.17].040, [49.17].050, and [49.17].060. WSR 03-09-009, § 296-807-18070, filed 4/4/03, effective 8/1/03.]

PDFWAC 296-807-18070

Use specific flanges for threaded hole wheels.