Seismic rod stiffener (also known as hanger rod stiffener or seismic bracing stiffener) is a specialized metal fitting for seismic-prone areas. It reinforces threaded hanger rods against buckling or compression failure during earthquakes. Installed by snapping the stiffener to secure a section of 1-5/8″ strut channel directly to the rod—often tightening a bolt to sandwich the rod against the channel—this forms a rigid composite unit.
It boosts the hanger rod’s moment of inertia, converting a slender support into a strong, stable brace for suspended MEP systems like pipes, ducts, and conduits.
Available size
| Size, imperial | Size, metric | Matching rod size (RS) | Clamp | Ref. No. |
|---|---|---|---|---|
| 3/8″ | M10 | 3/8″ ~ 5/8″ (M10 ~ M16) | V-shape | C9711 (ISO) |
| 3/8″ | M10 | 3/8″ ~ 5/8″ (M10 ~ M16) | U-shape with wings | C9712 (ISO) |
| 3/8″ | M10 | 3/8″ ~ 3/4″ (M10 ~ M20) | Non | C9713 (ISO) |
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