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Most people just hand-tighten their coax cables, let alone actually use a torque wrench to get the perfect torque. If you want to “do it right,” Jonard makes a series of torque wrenches designed specifically to prevent over-tightening 7/16-inch “F” connectors on Coax Cable.

When you’ve reached the specified torque with this 6-1/2″ wrench, you’ll hear an audible click. Jonard mentions that these wrenches only work in tightening mode, which isn’t that uncommon — do you use your torque wrench to loosen your lug nuts?

Jonard sells four models: a full head and a speed head in 20 inch-pound and 30 inch-pound versions.  Any of ’em will run you $27 before shipping.

Torque Wrench [Jonard]
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7 Responses to Coax Torque Wrenches

  1. Gordon says:

    Such wrenches are “standard” issue when connecting calibration standards to a network analyzer and similar instruments. Of course they cost a bit more, and are made for SMA, 3.5mm, 2.4mm, and other precision coaxial connectors.

  2. Chris W says:

    I like these. You aren’t likely to overtorque with them, but you can snug it down enough to avoid loosening. http://www.lsdinc.com/content/product_details/68
    Labor Saving Devices has lots of wire pulling tools. I’m not too thrilled with their initials,.though.

  3. Scott says:

    I guess I ought to know, but I don’t. What’s the skinny? When is 20 inch-pounds correct and when is 30?

  4. fred says:


    The LSDI Base-Boar-Zit is a favorite with us for remodel work – neatly getting low voltage telecom etc. wires up into walls without the need to chisel out plaster/drywall and base plates.


  5. Joe C. says:

    Since I don’t work with these a lot, what’s the issue with over-torquing (other than the obvious stripping or breaking)? Does it affect the insulating core, or . . .?

  6. Toolaremia says:

    @Joe — over-torquing can definitely crush the insulation, as well as the center contacts and ground mating surfaces. Any change to those can alter the impedance and increase the VSWR. Under-torquing can be just as bad if an air-gap is left in the insulator, or the center pin or ground mating surface isn’t fully engaged. Becomes a bigger and bigger problem the farther one goes into the Gigahertz.

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