For hex head and TC bolt testing machines, look no further than GWY. We supply Skidmore-Wilhelm and Norwolf bolt testing equipment, will assist you when performing the tests and can troubleshoot any issues that arise throughout the process.
We stock the full line of Skidmore and Norwolf bolt testing machines, as well as an extensive inventory of Skidmore and Norwolf parts and accessories.
Skidmore first developed bolt tension calibration technology in the 1950s, and their units became the industry standard for testing high-strength bolts. In the same way that “Kleenex” became the generic term for tissues, “Skidmore” is the generic industry term used when referring to bolt tension calibrators. Today, both Skidmore-Wilhelm and Norwolf offer lines of bolt testing machines that are used for installations performed using manual, electric, pneumatic and hydraulic wrenches.
Skidmore bolt testing is required in applications such as steel buildings, bridges and similar structures. Skidmore bolt testing is performed for two main purposes:
There are two types of tests Skidmore (bolt tension calibrator) equipment is used for:
Preinstallation Verification (PIV) Testing
This bolt testing process involves inserting a bolt, nut and washer assembly into the bolt tension calibrator, then tightening them just as you would in an actual steel construction. Then, a tension reading is taken from the bolt tension calibrator to verify that the minimum tension requirements for the bolt have been met. For steel buildings, the PIV test requirements, including the minimum PIV tension, are found in Section 7 of the RCSC Specification. For bridges or other structures, this information is found in the State DOT and/or project-specific specifications.
Rotational Capacity (RoCap) Testing
This bolt testing process is more involved than the PIV testing process.
For steel buildings, the RoCap test requirements including all minimum and maximum torque & tension values are found in Appendix A2 of the ASTM F3125 Specification. For bridges or other structures, this information is found in the State DOT and/or project-specific specifications.
There are two primary manufacturers of bolt tension calibrators (“Skidmores”); the long-time provider Skidmore-Wilhelm and the new kid on the block (although they’ve been around for over a quarter century) Norwolf. Both manufacturers produce excellent quality products that are cost competitive and offer many similar features. There are some features that set the manufacturers apart, but ultimately the choice comes down to one of personal preference and what fits the individual needs of a company or project.
Extensive Inventory
We offer the full line of Skidmore bolt testers and we stock more Skidmore parts than Skidmore.
Partnership Mindset
Since 1975, providing long-term value through customer service has been our top priority.
On-Site Repairs
We have the equipment, parts inventory and experience to service your tools and equipment.
Full-Service Expertise
Our team has the knowledge, expertise and drive to help you deliver absolute accuracy at every turn.
Kind words from our customers:
“It was a great pleasure working with GWY. They go above and beyond to help with what we needed. Don was very quick on getting what we needed out to us to complete the job. Very proud to be a GWY customer.”
“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.”
“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.”
For information about Skidmore rental and purchase options, parts availability or related requests, please complete this form:
Your questions, answered.
We typically bill by the week but we’re working on a monthly option.
Yes, we provide tools all over the world.
Typically, the answer is no but there are exceptions. The only interchangeable sockets for current model shear wrenches are between the GV-301ZA and the GVC-301EZ. The Older models like the S-60EZA share sockets with their newer models like the S-61EZ. The same is true for the S-90EZ and GS-91EZ as well as the S-110EZ and the GS-111EZ.
There are a few TN tools that share sockets with each other such as the TN-20EZ and the TN-22EZ as well as the TN-30EZ and the TN-33EZ.
The GNR series can share sockets with some of the TN tools. The GNR-31E, 51E, & 81E can use the TN-20EZ/22EZ bar sockets instead of impact sockets. The GNR-121E can use the bar sockets of the TN-24EZA and the GNR-211E can use the bar sockets of the TN-30EZ/33EZ. The GNR’s can also share impact sockets that have their correct drive size.
We do have some used tools for sale but the selection of used is limited.
Verify everything is back in the case and send it back to GWY at 217 Forest Rd., Greenfield, NH 03047 in the preferred method of your choice.
This can happen for several reasons. It could be that your inner socket is worn and is not functioning properly. It could be a worn ejector spring or ejector pin. If you are installing galvanized bolts you may need an oversized inner socket to fix this problem. It could be that the latch and ejector system inside the tool is worn.
1-year manufacturers defect warranty on new tools.
When we receive the tools, we typically have a one to two day turnaround time before shipping back to the customer.
