Questions and Answers for Simpson Strong-Tie 1/4 in. x 6 in. Strong-Drive SDS Heavy-Duty Connector Screw (10-Pack)

A:  Hello Jacque, this is Ricardo with Simpson Strong-Tie. Thank you for your message. We want to make sure we address your question on proper on-center spacing. Typically when calling out screw size and spacing for a fastener onto a new or existing structure, the detailing will come from the designer or engineer-of-record. This will be based on or limited to their calculations, design load requirements and minimum specifications provided by the manufacture. If you need more information or have additional questions, please contact the Simpson Strong-Tie Customer Service team at 800-999-5099. We look forward to hearing from you.​​

A:  We have an engineering letter detailing the use of the 3 1/2" Strong-Drive SDS screw with a 2x ledger or the 5" Strong-Drive SDS screw with a double 2x ledger; please see L-F-100DCKLIV16 on our website for complete information. Thank you!