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Hi, I’m Todd with BlastOne. Today I’m going to show you how to measure the orifice size of Ultra Tough blast nozzles to ensure they haven’t worn out too big on site. I’ll demonstrate two methods: one with the proper instrument and another field guide method using drill bits.
First, we’ll start with the #7 Ultra Tough nozzle using the gauge. The #7 indicates the orifice size should be 7/16 inches. Take your gauge and set it to the 7/16 mark. I recommend using an expo marker or any easily removable marker to paint the side of the gauge, as you’ll insert this end into the nozzle.
Insert the painted end into the nozzle from the contract thread side, not from the endpoint where the abrasive comes out. Spin it a bit and then check the mark. It should be just below the 7/16 mark, which is within spec. If the mark is closer to the half-inch, the nozzle is worn out and needs replacement, as it matches the size of a #8 nozzle.
For the field guide method, use drill bits to check the size. Start with a 7/16 drill bit. Insert it into the nozzle from the same side, ensuring it feels tight and doesn’t wiggle too much. If it fits snugly, the nozzle is correct. To confirm it’s not worn out, try a half-inch drill bit, which should only fit through a #8 nozzle. If the half-inch bit doesn’t go through, your #7 nozzle is still good.
That’s how to measure the orifice size of your blast nozzles. If you have any more questions, click the link below.
