Mechanical Couplers - DYWIDAG THREADBAR ® Reinforcing Systems

Components of the DYWIDAG THREADBAR® reinforcing system are manufactured in the United States and Canada exclusively by DYWIDAG-Systems International.

Dywidag Threadbar reinforcing steel is available in grades 60 and 75 for sizes #6 through #8, grade 75 for #9 through #18, and grade 80 for 63mm bar. Grade 60 and 75 Threadbars conform to the requirements of ASTM A615. except in markings. Threadbars may be shipped to the job in 40 foot or 60 foot mill lengths or fabricated to specifications.

Dywidag Threadbar reinforcing steel has a continuous rolled-in pattern of thread-like deformations along its entire length. More durable than machined threads, the deformations allow nuts and couplers to thread onto a Threadbar at any point along its length.

Dywidag couplers and hex nuts develop the full ultimate load of the Threadbar. Slippage of the couple under stress in controlled by torquing opposing Threadbars together or by using lock nuts. The magnitude of the torque required varies with the allowable slip and threadbar size.

The Dywidag Threadbar reinforcing system offers a simple, reliable and economical splice. A Dywidag splice requires less crane time and less labor time for assembly than is required for welded or swaged splices.

Unlike some splices, the Dywidag splice may be installed in adverse weather conditions and does not create a fire hazard. As opposing Threadbars need only to be chalk marked before assembly to assure proper engagement, supervision and quality control requirements are minimized.

Coupler
When opposing Threadbars are torqued together, the Dywidag coupler may be used without nuts. Using couplers described in the included table, the splice will develop the full ultimate load of the bar in tension and compression.

Coupler with Hex Nuts
When opposing Threadbars are not torqued together, hex nuts may be used on each end of the coupler, and tightened against the coupler, and tightened against the coupler. Using hex nuts described in the included table, the splice will develop the full ultimate load of the bar in tension and compression.

Coupler with Lock Nuts
Lock nuts may also be used with the Dywidag coupler when opposing Threadbars are not torqued together. Using lock nuts described in the included table, the splice will develop the full ultimate load of the bar in tension and approximately 50% of the ultimate load of the bar in compression.

Nuts and Couplers which develop 125% of the yield stress of the bar are available on special order.

Properly sawed or sheared, Dywidag Threadbars do not require end preperation except where the coupler is utilized without nuts as a compression splice. Transition couplers for splicing the Threadbars of different sizes are also available on special order.

Coated Bars
Threadbars may be epoxy coated in accordance with ASTM A775 or galvanized in accordance to ASTM A123. Threaded accessories for coated bars thread over the coating. Contact DSI for hardware dimensions.