What is SRT screws

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The SRT screw that is used for mounting the 1461 closer body is 1 3/8" long.Four screws are used to mount the closer body.
SRT "Self Reaming, & Tapping" screws are the default type screws shipped with LCN closers, when a specific screw type is not specified.   There are 3 standard lengths of SRT screws: 1-3/8" 1...
LCN "does not" recommend the use of SRT screws is wood doors. LCN "only" recommends the use of Wood Screws in wood doors and frames, as noted on the installation instructions.
The standard screw pack for an LCN closer is the SRT (Self Reaming and Tapping) screw. Thru bolts are an option, but must be specified on the order. There is no charge for them, but they do need to...
SRT, Philips head screw, self-reaming and self-tapping capability