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Skidmore Model K

The Skidmore Model K is our largest bolt tension calibrator reaching 225,000 lbs. of bolt tension and is upgradable to 450,000 lb.

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Business Hours: 8am - 5pm Est

The Model K 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: 225,000 lbs. of Bolt Tension (can be upgraded to 450,000 lb.)



Skidmore K Minimum Bolt Length
Bolt Diameter Regular Bolt Length
1 – 1/4″ 5 – 1/2″
1 – 3/8″ 6″
1 – 1/2″ 6 – 1/2″
1 – 3/4″ 8″
2″ 8″
2 – 1/4″ 9″
2 – 1/2″ 9 – 1/4″


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


Imperial Metric
1 – 1/4″ M32
1 – 3/8″ M33
1 – 1/2″ M36
1 – 3/4″ M39
2″ M42
2 – 1/4″ M45
2 – 1/2″ M52


Helpful resources:

Instructional Manual

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Kind words from our customers:

  • I have enjoyed working with GWY. Their people know their product well. Their prompt response and delivery of the product is as good as any service Ogeechee Steel has ever had the pleasure of doing business with.”

  • From choosing the right equipment for each job’s unique requirements to problem solving in the field, GWY is always willing to go out of the way to find a solution. Mix that customer service in with their technical expertise and easy-to-use tools, they really help make bolt up easy.”


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.

Where are you located?

217 Forest Rd Greenfield, NH 03047