Manufacturers of precision torque tools and
testing equipment since 1938.

From the invention of the torsion bar dial type wrench and split-beam click wrench, to the most reliable micrometer adjustable click wrench, Precision Instruments has always been a leader in innovation.

Process (35K)

Precision Instruments was incorporated in 1938 to pursue the manufacture of the first torsion bar dial type wrenches. Central to the very first patent, awarded five years later, were the tenants of accuracy, reliability, and durability that have become synonymous with the Precision Instruments name. Over the next 24 years, the company would refine and elaborate on the torsion bar dial type wrench with advances that include increased accuracy and signaling options.

The same principles of torsion bar wrenches were extended to torque drivers in 1962, and the design was awarded a patent. Seven years later, Precision Instruments unveiled torsion bar standards for us in torque testers. These devices paved the way for adequate testing of torque wrenches in industries where a large number of torque wrenches are used. Virtually all modern torque testers trace their roots to this device.

In 1974 Precision Instruments successfully launched the split-beam click wrench market with the introduction of the C line. The wrenches solved many of the problems with traditional micrometer adjustable click wrenches and was awarded several patents. By the early 1990s, Precision Instruments released the MD series of fully releasing drivers and received a patent for the design, detailing the mechanism for accurately applying torque with a fully-releasing driver type wrench. Precision Instruments also received a patent detailing the first mechanism for externally calibrating a micrometer-type torque wrench in both the clockwise and counterclockwise directions and with regard to spring rate. This patent was combined with a patent that allowed for the elimination of 95% of the friction in these wrenches.

Precision Instruments spans two buildings and occupies 50,000 square feet of floor space in Des Plaines, IL. The plant oversees the manufacturing of tools from start to finish. The plant performs press work, conventional and CNC turning, conventional and CNC milling, drilling, off-hand and robotic polishing, mass-media finishing, plating, welding, assembly, calibration, packaging and shipping. Statistical process control dictated by written quality control manual ensures that the components remain within specified tolerances at high confidence levels.

Precision Instruments has a dedicated tool and machine development department. This department designs and produces nearly all the tooling and specialty machines used in-house. From press dies to specialty cutters and robot programming, this department allows Precision to efficiently design and implement sophisticated solutions to complex machining. This flexibility allows Precision to stay on top of cutting edge manufacturing and continually offer advancement in quality and reliability to our customers while maintaining efficient manufacturing techniques.