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Changes to the Building Code Requirements for Masonry Construction require longer lap lengths for some bar sizes. These changes mean more congestion in masonry cells and more difficult construction. To alleviate this problem, builders can either use open-cell blocks, which are quite expensive, or use mechanical rebar couplers to eliminate the lap.
LENTON® MASON LOCK is a taper-threaded coupler that quickly and easily connects two pieces of rebar. This cost-effective connector uses the time-tested, field-proven taper thread to help assure strength, consistency and reliability while simplifying installation. LENTON taper-threaded splices are designed for use on worldwide standard grades of rebar and meet ACI®-318, BS 8110 and DIN 1045 full-tension splice requirements and many other international standards. LENTON couplers are available in sizes #3 - #18 (10 mm - 57 mm). FeaturesLENTON MASON LOCK taper-threaded splices:
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Eliminate lap splices in CMU block walls.
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Accelerate construction schedules. They are one of the fastest systems to install.
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Help ensure easy installation with the problem-solving taper-thread design.
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Are excellent for future extension applications.
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Increase structural integrity ApplicationsLENTON MASON LOCK serves as an effective alternative to open-cell blocks.More InformationHow it works:
1. Place the threaded male dowel into footer with the LENTON taper-threaded end pointing upwards covered by a breakaway thread protector cap. Specify dowel length – ½ lift height recommended Footer. Specify anchorage details for hook or LENTON TERMINATOR Threaded Male Dowel Breakaway Bar Thread Protector Cap.
2. Install masonry block wall to heights or lifts that agree with current codes and standard practices. Recommended maximum dowel length is eight feet.
3. From the top of the masonry wall, reach down using the LENTON MASON LOCK assembly and tap the breakaway cap. The cap will break away, allowing the coupler to be threaded onto the rebar.
4. After the cap has broken away, hand tighten the LENTON MASON LOCK coupler assembly onto the protruding male dowel.
5. To complete the installation, grip the exposed length of rebar protruding from the top of the block wall with a pipe wrench. Tighten the LENTON MASON LOCK assembly in a clockwise rotation until tight. Refer to supplied installation instructions for recommended tightness. 
(For additional lifts, repeat steps 2-5)
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