Page 78 - Jetstream-Catalog-2016
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 The following are the torque values used for the determining the load ratings of Jet Stream Products when attached to channel framing as specified by Metal Framing Manufacturer’s Association (MFMA) Standard #2:
For beam clamps or other applications the following torque values from Manufacturer’s Standardization Society
(MSS) SP-69 are recommended unless otherwise specified.
Thread Size
Inch mm in. lb.
Torque ft. lb.
Thread Size Inch mm 1⁄4 6.4 5⁄16 7.9 3⁄8 9.6
7⁄16 11.1 1⁄2 12.7 9⁄16 14.3 5⁄8 15.8 3⁄4 19.0 7⁄8 22.2 1 25.4
in. lb. ft. lb. Nm
40 3.3 4.5 50 4.2 5.6 60 5.0 6.8 90 7.5 10.2 125 10.4 14.1 180 15.0 20.3 250 20.8 28.2 400 33.3 45.2 665 55.4 75.1
990 82.5 111.9
1⁄4 6.4 72 6 8.1
5⁄16 3⁄8 1⁄2
7.9 132
9.6 228 11.1 600
11 14.9 19 25.8 50 67.8
General Information
Note: Caution should be taken not to over tighten the set screw on iron beam clamps as this will cause distortion, a lower maximum load capability and possible breakage.
Uniform load and Point load
When a distributed load has a constant value over the entire bracket or beam length, it is said to be uniformly loaded. This would be similar to loading identical boxes on a shelf side by side. A point load is when the force of the load is concentrated on one point along the bracket or beam. Using identical supports as shown below and the point load located 1⁄2 way between the supports, the point load rating will be 1⁄2 the uniform load rating. Load ratings are generally listed in pounds (lb.) or kilo Newtons (kN).
Cantilever load
Uniform load
X 2
A cantilever bracket or beam is rigidly attached at one end and is completely free at the other end. A cantilever load is applied at one point or spread along a section of the length of a bracket or beam and causes a twisting load or moment at the mounting point. Load ratings for this type of bracket are generally listed in inch pounds (in. lb.) or Newton meter (Nm). A uniformly applied load on a bracket (figure “A") may be considered as a point load by taking the uniform load and expressing it as a single point load of the same force at a distance of 1⁄2 the total distance the load is spread over as shown in figure “B". This is calculated by multiplying 1⁄2 the distance “X", in inches or meters, by the load expressed in pounds or Newtons.
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X 2
Cantilever load (Figure “A")
Cantilever load (Figure “B")
Technical Data
Point load

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