Seismic Rod Stiffener

Seismic Rod Stiffener Supplier

Robexstrut is a trusted supplier of high-quality seismic rod stiffeners, offering innovative solutions to enhance structural integrity in seismic applications. A seismic rod stiffener is designed to increase the compressive strength of threaded rods, making them ideal for use as seismic bracing in MEP (Mechanical, Electrical, and Plumbing) support structures. With a surface finish of pre-galvanized steel, it provides superior durability. The seismic rod stiffener has a 9 mm material thickness and weighs just 0.07 kg, offering easy handling and reliable performance in seismic zones.

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Seismic Rod Stiffener Specification

Material :

Unistrut channel nuts are made from mild steel bars. After machining, they are case hardened, ensuring positive biting action into the inturned edge of the Unistrut channel.

Bolt Size | Channel Nut ASTM :

1/4″ & 5/16″ – A1011 SS GR45
3/8″, 7/16″ & 1/2″ – A576 GR1015 Modified
5/8″ & 3/4″ – A36 or A675 GR60
7/8″ – A36

Threads :

All threads on the nuts and bolts are Unified and American coarse screw threads.

Dimensions :

Imperial dimensions are in inches.
Metric dimensions are in millimeters, unless otherwise noted.
Many Unistrut nuts, bolts, and hardware items are available in standard metric dimensions.
Consult the factory for ordering information.

Design Bolt Torque:

BOLT SIZE	1/4″-20	5/16″-18	3/8″-16	1/2″-13	5/8″-11	3/4″-10
Rec.Torque Ft/Lbs(N*m)	6 (8)	11 (15)	19 (26)	50 (68)	100 (136)	125 (170)
Max Torque Ft/Lbs<N*m)	7(9)	15(20)	25(34)	70(95)	125(170)	150(203)

Features & Applications of Seismic Rod Stiffener :

Enhance your seismic bracing systems with Robexstrut’s seismic rod stiffeners. Contact us today for more information!

Unistrut Seismic Rod Stiffener Size Chart

Rod Size (In)	Root Area (In²)	Radius of Gyration (In)	Design Load (Lbs)	Rod Stress @ 100% (10,700 PSI) (In)	Rod Stress @ 75% (8,025 PSI) (In)	Rod Stress @ 50% (5,350 PSI) (In)	Rod Stress @ 35% (3,745 PSI) (In)
8/3	0.068	0.074	730	9	11	13	15
10 (mm)	49.5 (mm²)	1.99 (mm)	3.6 (kN)	229 (mm)	279 (mm)	330 (mm)	381 (mm)
2/1	0.126	0.1	1,350	12	14	17	21
12 (mm)	72.4 (mm²)	2.40 (mm)	5.3 (kN)	305 (mm)	356 (mm)	432 (mm)	533 (mm)
8/5	0.202	0.127	2,160	15	18	22	26
16 (mm)	138.3 (mm²)	3.32 (mm)	10.2 (kN)	381 (mm)	457 (mm)	559 (mm)	660 (mm)

Seismic System Attachments for Rod Stiffening

Product Name	SC228 – Hanger Rod Stiffener
Size Range	Secures 3/8″-16 thru 5/8″-11 hanger rod
Material	Steel
Function	Secures channel to hanger rod for vertical seismic bracing. Slight distortion of the channel (strut) may occur upon installation of rod stiffeners.
Finish	Electro-Galvanized. Contact customer service for alternative finishes and materials.
Weight	Approx. Wt./100 – 21.0 lbs. (9.5 kg)
Order By	Part number and finish
Note	Order channel separately

Size Range	Secures 3/8″-16 thru 7/8″-9 hanger rod
Material	Steel
Function	Secures channel to hanger rod for vertical seismic bracing.
Approvals	Included in Seismic Engineering Guidelines approved by the State of California Office of Statewide Health Planning and Development (OSHPD). Refer to Seismic Engineering Guidelines OPM-0052-13 for additional load, spacing, and placement information.
Finishes	304 stainless steel, 316 stainless steel, and HDG (Hot-Dip Galvanized)
Weight	– Approx. Wt./100 Fig. 98: 11.8 lbs. (5.3 kg) – Approx. Wt./100 Fig. 98B: 12.7 lbs. (5.7 kg)
Order By	Figure number and finish