Quality Light Steel Framing Connections and Members
Your Link to the Steel Industry®

CALL US TODAY 1-888-474-4876

Flat Strap

Flat Strap

In addition to it's standard use in wall bridging, Flat strap is also the tension element used to transfer loads between diagonally located strap tracks in TSN's StiffWall® System (x-braced shear walls). Straps are utilized on both sides of the StiffWall for shear resistance. TSN's Flat Strap provides superior quality with high yield ASTM A1003 steel and hot-dipped galvanized coating for long-term durability.


  • Designed and manufactured to meet the performance requirements of the project.
  • Only mill certified high strength steel is used.
  • Meets or exceeds both strength and stiffness requirements of the applicable building code.
Downloads Download Technical data Tech Sheet | Download drawing file DWG | Download specification data Specs |

Product Information

TSN_StiffWall_Color_Coded_Components A1003 / A1003M ST50H [ST340H], Grade 50 (340), 50ksi (340MPa) minimum yield strength, 65ksi (450 MPa) minimum tensile strength, G-60 (Z180) hot-dipped galvanized coating; or equivalent.
TSN_FS_Nomenclature TSN_FS_Shape

Order Information for StiffWall Flat Strap

The Selection of flat strap for StiffWall is simplified to 6 strap types, with load capacity factored using standard 12ga (97mil) strap track (see Step-By-Step Design Procedure on TSN's StiffWall product page for Allowable Flat Strap Capacity Chart). Flat Strap is cut to length with square ends, and will need to be cut to final length in the field. To determine the length of the flat straps, follow these simple steps:

  1. Find the width (A) and the height (B) of the StiffWall.
  2. Then, use the following formula to determine the length of the strap: A2 + B2 = C2
  3. Next, take the square root of C, round up to the nearest whole number and add 1

This will result in a length in feet that you can work with. If C equals a whole number, you may want to add 2 to make sure the length is enough.

Example: 8' wall height with a width of 16' would look like this: (8x8) + (16x16) = √320. = 17.88
Round up to 18' and add 1' for a strap length of 19'.
Some points to remember concerning Flat Strap:
  • Strap must be pulled tight after a gravity load above has been applied. TightStrap® tool can be used to flatten the strap and put minor tension force into it.
  • Flat strap cannot be installed, then un-installed by releasing the screws to the strap track, and then re-installed with screws again in the same screw holes. Either a new piece of strap is required or the exposed edge of the strap needs to be welded to the strap track with an approved weld design.
  • It is recommended not to fasten the strap to the infill studs between the columns. However, typical or occasional attachment of sheathing and/or resilient channel to the infill studs through the strap is acceptable.
  • Straps should not be spliced without an approved design.
  • Four (4) pieces of strap are required in each StiffWall® (If there are 10 StiffWall shear walls, 40 pieces of flat strap will be necessary).
TSN_FS_Nomenclature TSN_FS_Shape
Flat Strap Product Profile (For StiffWall®)
Section Width (D) Gauge Design Thickness (t) Min. Steel Thickness (t(min)) Area Weight
(in) (in) (in) (in2) lbs/ft
FS400-54, 50 ksi 4 16 0.0566 0.0538 0.226 0.770
FS600-54, 50 ksi 6 16 0.0566 0.0538 0.340 1.156
FS800-54, 50 ksi 8 16 0.0566 0.0538 0.453 1.541
FS800-68, 50 ksi 8 14 0.0713 0.0677 0.570 1.941
FS1000-68, 50 ksi 10 14 0.0713 0.0677 0.713 2.426
Flat Strap Product Profile (For Bridging)
FS200-43, 50 ksi 2 18 0.0451 0.0428 0.090 0.307
FS300-43, 50 ksi 3 18 0.0451 0.0428 0.135 0.460
FS300-54, 50 ksi 3 16 0.0566 0.0538 0.170 0.578
Table Notes
  1. Section properties and capacities are calculated in accordance with AISI-NASPEC 2007.
  2. Structural framing is produced to meet or exceed ASTM C955, A653, and A1003.
  3. Non-Structural framing is produced to meet or exceed ASTM C645, A653, and A1003.
  4. Galvanized sheet steel meets or exceeds requirements of ASTM A924 & A1003
TSN's Product Catalogs are an essential resource for the design of cold formed steel.  Developed by Engineers, the catalogs contain design data for members connectors, and fasteners.
Flat Strap and the rest of TSN's StiffWall® Shear Wall System can be found in the following Catalogs:


TSN Load Bearing Member
Technical Catalog

TSN Reduced Load Bearing Wall Member Catalog

TSN Load Bearing Member
Order Catalog

For a full list of our product catalogs, specification sections, inspection checklists, and research reports please click here.