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Skidmore Model MZ

The Skidmore Model MZ is our smallest and most versatile bolt tension calibrator reaching 126,000 lb. of bolt tension.


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The Model MZ Bolt Tension Calibrator verifies:

  • Fasteners meet minimum bolt tension specifications.
  • Impact wrenches are properly calibrated to achieve proper tension in the bolted joint.
  • Tension-control fasteners shear off at the correct tension.
  • Direct Tension Indicating (DTI) washers are indicating at proper tension
  • Bolting crew understands how to achieve proper tension in all types of fasteners
  • You have the right installation tools and equipment.

Capacity: 126,000 lbs. of Bolt Tension


Skidmore MZ Minimum Bolt Length
Bolt Diameter Regular Bolt Short Bolt
1/2″ 2″ 1 – 1/4″
5/8″ 2 – 1/4″ 1 – 1/2″
3/4″ 2 – 1/2″ 1 – 3/4″
7/8″  2 – 3/4″ 2″
1″ 3″ 2 – 1/4″
1 – 1/8″ 3 – 1/4″ 2 – 1/2″
1 – 1/4″ 3 – 1/2″ 2 – 3/4″


The Model MZ can be used with our adapter kits to test the following bolts sizes:


Imperial Metric
1/2″ M12
5/8″ M14
3/4″ M16
7/8″ M18
1″ M20
1 – 1/8″ M22
1 – 1/4″ M24


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  • GWY has been a great company to work with. My company requires receipts for all credit card purchases and GWY has made this very easy. With rental equipment this usually isn't the easiest to deal with but they have made this process very smooth. I get a weekly receipt emailed to me without having to ask for it. They also have great customer service and are very helpful and friendly. Would definitely recommend.”

  • GWY’s parts inventory and response is top notch. You can expect prompt, respectful, knowledgeable answers to questions and full cooperation when you need it. Truly a mark of a reputable company with a good team.”


Do you sell tools outside the country?

Yes, we provide tools all over the world.

Does the tool come with anything?

All of our tools come with a case.  Our Turn-of-Nut & Shear Wrenches come with the one size socket and a metal case.  The cordless tools come with one or two batteries, a charger, and a case.

Is there a warranty on your tools?

1-year manufacturers defect warranty on new tools.

What is the lead time on getting this tool to me?

If we have it in stock, we can send it next day air within the US to get to you tomorrow.