SPH Slim Profile Heads (Interchangeable Heads for Torque Wrenches)

Introducing the SPH: Slim Profile Heads

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.

Why Create Slim Profile Heads?

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.

What Makes Slim Profile Heads Important?

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.

Differences You Can "C"

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.

Slim Profile interchangeable Heads for Torque Wrenches

Please note this important common centerline distinction:

SPH Series Open end interchangeable head for torque wrenches SPH 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 #	Description	Capacity	SPH "C" Dimension	"C" Dimension Difference	OE "C" Dimension	Capacity	Description	OE Part#
853871	OE 19mm SPH	45 Nm	4.37mm	8.33mm	12.70mm	113 Nm	OE 19mm	819949
853872	OE 22mm SPH	38 Nm	6.73mm	5.97mm	12.70mm	169 Nm	OE 22mm	819951
853873	OE 24mm SPH	71 Nm	6.35mm	6.35mm	12.70mm	254 Nm	OE 24mm	819952
853874	OE 27mm SPH	100 Nm	7.37mm	5.33mm	12.70mm	254 Nm	OE 27mm	819229
853875	OE 30mm SPH	103 Nm	7.52mm	5.18mm	12.70mm	310 Nm	OE 30mm	819956
853876*	OE 36mm SPH	152 Nm	10.01mm	5.87mm	15.88mm	350 Nm	OE 36mm	819776
853877*	OE 41mm SPH	260 Nm	9.65mm	6.23mm	15.88mm	400 Nm	OE 41mm	819755
853912	OE 13mm SPH	35 Nm	5.87mm	4.29mm	10.16mm	39 Nm	OE 13mm	819945
853913	OE 17mm SPH	25 Nm	5.54mm	4.62mm	10.16mm	79 Nm	OE 17mm	819948
853914	OE 32mm SPH	103 Nm	10.69mm	2.01mm	12.70mm	338 Nm	OE 32mm	819958
853923*	OE 50mm SPH	275 Nm	11.00mm	4.88mm	15.88mm	400 Nm	OE 50mm	819756

*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. Open end interchangeable head dimensional diagram

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.