The DTI Washer is manufactured under the ASTM F959 standard in grades A325, A490, A325M, and A490M, with a black oxide finish or uncoated.

The DTI Washer is structural in use and is designed to crush the silicone when the bolt reaches the desired tension.

Likewise, the DTI Washer is used with A325 and A490 bolts (structural bolts).