GRADE TYPES
A307 A
A307 B
GRADE 2
GRADE 5
GRADE 8
GRADE 9
300 SERIES STAINLESS
316 STAINLESS
BRASS
DTI & VIEWTITE®
WASHERS
Direct Tension Indicator washers display a visual indicator, in which a colored elastomer is extruded from the DTI when proper tension is achieved.
TurnaSure LLC is an American manufacturing company that specializes in industrial fastener technology, particularly devices used to ensure bolts are tightened correctly. TurnaSure designs and produces Direct Tension Indicators (DTIs)—specialized washers that help measure and verify the tension (tightness) of bolts in critical structures.
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These washers compress in a predictable way when a bolt is tightened
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That compression visually or physically indicates whether the correct tension has been achieved
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This helps improve safety, reliability, and efficiency in construction and engineering projects
PROJECTS USING TURNASURE
Structural DTI installation for ASTM F959 and F959M DTIs, and other worldwide structural bolt and DTI standards
Traditional TurnaSure DTIs can be installed in any one of three different ways (see illustrations below). Method #1 is recommended for applications with 3 or more plies and/or when very large bolts are used as it assures that any undesired movement in the steel plies has not trapped a long bolt. Otherwise ALL methods are good depending on the erector's preference. TurnaSure curved protrusion DTIs can be installed under the nut WITHOUT the need or cost of a hardened washer. Assembling the DTI directly under the nut is satisfactory on standard length bolts in the usual two or three ply connections when hardened DH or 2H nuts are used. One advantage of using DTIs on the ‘turned element’ (nut) side is allowing the tightening tool operator to inspect their work as each assembly is tightened.
DTI's for Anchors
DTIs for anchor bolts, studs, and rod are assembled under the nut, with the protrusions facing ‘up’ bearing on a through-hardened washer over which the nut is placed. As the nut is turned to stretch the anchor bolt, the gap of the DTI is reduced proportionally to the tension being induced in the anchor. One of our most commonly used DTI designs has been specially made so that once the DTI is completely flat, the desired level of tension or clamping force is reliably present in the anchor bolt, stud, or rod.
ASTM F959/F959M for use on inch or metric ASTM F3125 Grade A325, Grade A490, Grade F1852, Grade F2280, Grade A325M, or Grade A490M bolts.
Illustrations and text provided by TurnaSure LLC (a Wrought Washer Manufacturing Inc. company).
