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PDFWAC 296-807-18050

Use proper flanges.

(1) You must mount all abrasive wheels between flanges that have a diameter at least one-third the diameter of the wheel.
Exemption:
This requirement does not apply to the following types of wheels:
1. Mounted wheels;
2. Cup, cone or plug wheels with threaded inserts or projecting studs;
3. Abrasive disc wheels (inserted nut, inserted washer and projecting stud type);
4. Plate mounted wheels;
5. Cylinder, cup, or segmental wheels mounted in chucks;
6. Types 27, 28, and 29 wheels;
7. Internal wheels less than two inches in diameter;
8. Modified Type 6 and 11 wheels (terrazzo);
9. Types 1 and 27A cutting-off wheels.
(2) You must make sure flanges are:
(a) Dimensionally accurate;
(b) Properly balanced;
(c) Flat;
(d) Free of rough surfaces or sharp edges.
(3) You must make sure, if a wheel is mounted between two flanges, that both flanges:
(a) Are the same diameter;
(b) Have equal bearing surfaces.
Exemption:
The following wheels do not require same diameter, equal bearing surface flanges:
1. Types 27, 28, and 29 wheels with adaptors;
2. Modified Types 6 and 11 wheels with tapered K dimension;
3. Internal wheels less than two inches in diameter.
(4) You must make sure the driving flange is:
(a) Part of the spindle; or
(b) Securely fastened to the spindle.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050. WSR 15-23-086, § 296-807-18050, filed 11/17/15, effective 12/18/15. Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. WSR 07-03-163, § 296-807-18050, filed 1/24/07, effective 4/1/07; WSR 03-09-009, § 296-807-18050, filed 4/4/03, effective 8/1/03.]
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