Direct tension indicators, or DTIs, are single-use mechanical load cells used to indicate when the required tension has been achieved in structural fastener assemblies. [1] The load-indicating washer was invented in England in 1962 [citation needed].

DTI's are individual bolt load cells, which measure pretension developed during tightening, regardless of torque resistance of the bolt.

Load indicating washers (LIW) are used to develop the correct tension when installing A325 or A490 structural bolts. Standard DTIs and Squirter™ DTIs are made to ASTM F959. Load indicating washers may be available for other bolt grades as …

DTI's are individual bolt load cells, which measure pretension developed during tightening, regardless of torque resistance of the bolt. By far the simplest method is a DTI is put on one end of a bolt and tightened until the bumps are compressed enough so that a feeler gage cannot be inserted all around, or when the Squirter® DTI Squirt ...

TurnaSure manufactures the world's largest variety of Direct Tension Indicator Washers (DTIs) including the revolutionary new ViewTite® Visual Self-Indicator. Our DTIs are used for achieving required tension loads on bolts in countless applications.

Millions of Squirter® DTIs have revolutionized the bolt-up process for structural steel projects, making bolt installation and inspection easy and accurate.

DTIs are popular on tall buildings as properly tensioned fasteners assure no undesirable or unplanned movement or slip in piles. For instance, we believe that reports of "banging bolts" in strong wind conditions are a result of connections slipping, and that properly tensioned bolts substantially eliminate this disturbing phenomenon.

2003年5月14日 · DTIs and Through-hardened Steel Washers (F436): DTIs are a load cell used to indicate that fastener assemblies have been properly tensioned. DTIs may be heat-treated to a hardness range, which depends primarily on the specific DTI manufacturer's design for the size and type of DTI.

2018年11月7日 · Also known as Squirter Washers, the DTI Washer provides the steel fabricator and erector the ability to positively identify a structural bolt is delivering the require compression to the connection. Some customers believe the DTI Washer must be used in one method, the most common which is DTI under nut with the nut turning.

Wrought Washer manufactures the world's largest variety of Direct Tension Indicator Washers (DTIs), including traditional TurnaSure DTIs and the exciting, new TurnaSure ViewTite® Self-Indicators. These are used for achieving required tension loads on bolts in countless applications.