The Simpson Strong-Tie CMST12 Coiled Strap is a galvanized steel coiled strap built for wood-to-wood fastening, uplift restraint, and tension connections in structural framing. This is a coiled strap designed for resisting tension and uplift loads. Model Number CMST12. If you need one strap that can be cut on site for varying spans, this one keeps the truck stock simpler and the install more flexible.

What makes the CMST12 different from a fixed-length strap is the format. Instead of working around a pre-cut part, you start with a 40-foot coil and cut the length that matches the framing condition. That is useful for roof uplift tie-down paths, shearwall overturning resistance, and other wood framing details where field dimensions do not always line up with a standard part. Simpson Strong-Tie also positions it as a cost-effective alternative to pre-cut straps, which is exactly where this type of connector earns its keep.

The 12-gauge steel construction gives this strap the heavier-duty feel you want for structural load paths. It is not just thin metal for a light repair. It is intended for real framing work where the strap is part of how loads travel through the assembly. The galvanized G90 finish adds corrosion resistance for typical wood construction use, helping the strap hold up better in demanding framing environments than unfinished steel.

Installation details matter with a product like this, and Simpson Strong-Tie gives clear guidance. The strap uses nail slots for easier installation, and the staggered hole pattern helps with fastening layout. For this model, published retail specs indicate installation with 10d or 16d common nails. The manufacturer also notes that full published loads depend on using the specified fasteners and nailing schedule, so this is a product where following the table and notes is part of getting the performance you are buying.

Another practical advantage is how it handles varied framing conditions. The CMST series can be used in double 2x stud or post applications, and the manufacturer provides guidance for lap splicing and alternative nailing. That gives engineers, framers, and builders more flexibility when they need a continuous drag element or diaphragm chord member instead of a simple single connection. In plain terms, this is the kind of strap you keep around when the framing plan calls for custom lengths and you do not want to stop work waiting on a special part.

Who should buy it? This strap makes the most sense for framers, general contractors, builders, and serious DIY users working on structural wood framing where uplift and tension connections matter. If you are tying members together in a roof system, reinforcing a load path, or handling wood-to-wood fastening that needs more than basic hardware-store strap stock, the Simpson Strong-Tie CMST12 Coiled Strap is the right kind of connector. If you just need a decorative or light-duty strap, this is more hardware than you need.

Simpson Strong-Tie CMST12 Coiled Strap Is The Smart Buy When One Length Never Fits

This is a practical structural connector for guys who want one heavy coiled strap on hand instead of a pile of fixed-length parts.

• Who it's for: Framers, builders, remodelers, and serious DIY users handling structural wood connections, uplift restraint, or field-fit reinforcement details.
• Why it stands out: The 12-gauge build, 40 ft. coil, galvanized G90 finish, and jobsite cut-to-length flexibility make it more useful than a standard strap when dimensions vary.
• Worth knowing: The value of this strap depends on proper nailing and layout. Follow Simpson's load tables and installation notes instead of treating it like generic perforated strap.

• Can the CMST12 be cut to length on site? Yes. The CMST series is designed and packaged to be cut to length on the jobsite.
• What is the primary use for this coiled strap? It is designed to resist tension and uplift loads and is used for roof uplift and shearwall overturning resistance in wood framing.
• What material and finish does it use? It is made from steel and uses a zinc galvanized G90 finish.
• What fasteners are commonly used with this strap? Retail product data lists installation with 10d or 16d common nails, and Simpson Strong-Tie states that specified fasteners should be used to achieve published loads.