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C-C-2024 Nail Conversions

A bit more about double-shear nails. We introduced double-shear nailing in 1984 with the HUS hangers and later created the LUS, HGUS and HHUS hangers to take advantage of this innovative feature. The Eighth Day of Christmas blog post from December of 2023 discussed the innovation of double-shear nailing. In straight-nailed hangers, the joist nails are important in securing the joist for uplift, but they don’t help increase the download capacity of a hanger. In double-shear hangers, dome holes angle the joist nails so they penetrate through the hanger, through the joist and into the header. This allows both the hanger face nails and the joist nails to transfer load into the header, resulting in higher allowable loads. Double-shear nails need to be long enough to penetrate the header, so we required 10d common (0.148" x 3") or 16d common (0.162" x 3 1/2") nails for double-shear nailing. Positive placement nailers are pneumatic tools that have a mechanism that helps locate the nail in the connector hole. Many of these tools are limited to 2 1/2"-long nails, so contractors wanted the option to use short nails in double-shear joist hangers. We created a separate technical bulletin that provided reduction factors for short nails in specific hanger models. We incorporated these reduction factors into the connector catalog to make sure the information was readily available. We also expanded the substitution options to include post caps and post bases based on new testing. Nail Conversion 2024

Nail Conversion 2024

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Posted on June 30, 2025 Full size 1080 × 1381

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Published inFastener Substitutions in Connectors — Where We Started and Where We Are

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