Master Tappers® Master Drillers® Master Drillers® Plymetal Machine Screws Master Purlin/Girt Bolts® Culvert Fasteners Fin Neck Locking Bolts A-325 Heavy Hex Structural Bolts A-325 Heavy Hex Bolt Accessories Capscrews Nuts & Washers Squirter® Washers Sealing Washers Solid Steel Rivets Stainless Steel Guidelines (PDF) SQUIRTER® DTI WASHERS DIRECT TENSION INDICATORS NOW YOU CAN SEE ORANGE WHEN PROPERLY TENSIONED Made to ASTM F959 for use with A325 and A490 boltsProvides high consistent bolt tension in heavy hex structural bolts