Sturtevant Richmont is home to some of the most deliberate engineers on the planet. Nothing is ever created without enormous amounts of customer input and feedback. We build the tools for you.
What are SPHs?
The SPH is our "Slim Profile Head" for torque wrenches that use interchangeable heads. Like all of our interchangeable heads, the foundation is the Dovetail. The Dovetail has the basic design when we first patented interchangeable heads for torque wrenches. That was back in 1956.
We've refined the Dovetail a few times since then, but the basic concept is as strong today as it was back then. It is still the most effective approach to delivering maximum torque application using torque wrenches with interchangeable heads.
Like all of our interchangeable heads, we maintain the common centerline. Because we make a cast, one-piece heads, we are focused on the common centerline. Why is the common centerline so important?
Think about the formula for torque. Part of that equation is the distance between the center of the fastener and the tool length. Change that distance and you change the equation. Change the equation and the torque output changes. Companies use torque wrenches to eliminate variables, not add them.
Hydraulic assemblies come with their own unique set of challenges. Tight access is near the top of the list. Another challenge is ensuring that each and every hydraulic connector is compliant and the torque value is not changed while tightening another portion of the hydraulic connector. We built our Global 400 and Global 400mp wireless torque controllers as a part of that error-proofing system.
Like everything we create, customer demand drove the creation of these interchangeable heads for torque wrenches. Some of our largest customers work with hydraulics as part of their build.
Our customers told us that they were grinding down our heads so they could fit in tight access points.
Grinding down heads takes time, costs money, and there is no data on stress points. Plus, you may get some variances between grinding jobs.
As we designed the new heads, we ran computer-simulated, and real-life lab testing on stress points.
We were able to produce stronger heads with consistent dimensions. As always, we kept the common centerline consistent. With accurate torque values critical to creating compliant hydraulic connections, the common centerline is vital to eliminating assembly variables.
The difference is in the "C" dimension. Take a look. In our world, the "C" dimension is the thickness of the portion of the interchangeable head that engages with the fastener.
Please note this important common centerline distinction:
SPH Series up to 32mm have a common centerline of 1 7/16" or 36.5mm
SPH Series starting at 36mm have a common centerline of 3 7/8" or 98.4mm
|SPH Part #
|"C" Dimension Difference
|OE 19mm SPH
|OE 22mm SPH
|OE 24mm SPH
|OE 27mm SPH
|OE 30mm SPH
|OE 36mm SPH
|OE 41mm SPH
|OE 13mm SPH
|OE 17mm SPH
|OE 32mm SPH
|OE 50mm SPH
*SPH Series starting at 36mm have a common centerline of 3 7/8" or 98.4mm. Be sure to account for that difference when changing common centerline lengths.
The OE Part Number references the same size traditional interchangeable head for torque wrenches.
Note: All of our open-end heads, ratcheting open-end heads, and slim profile open-end heads have the U-bottom design. We changed from the V-bottom to the U-bottom to increase durability. From an engineering standpoint, a rounded corner distributes the stress vectors more evenly than designs that have intersecting planes.
If for some reason you want the V-bottom design, we can make that for you as a special. Different pricing, minimum order quantities, and increased lead times apply.
Our Slim Profile Heads are created in Carol Stream, Illinois by highly competent hands.