AI Overview

A vintage product catalogue or brochure cover from GKN (Guest, Keen & Nettlefolds) showcasing their High Strength Friction Grip Bolts and specialized Torshear bolting system.

Key Details Shown in the Image:

• The Worker: An industrial steelworker or erector wearing a protective hard hat, using a specialized pneumatic shear wrench to install structural fasteners on a heavy steel framework (such as a bridge or building frame).

• GKN High Strength Friction Grip Bolts: These structural fasteners are engineered to clamp steel plates tightly together, transferring loads via high friction between the joint faces rather than relying solely on the shear strength of the bolt shank.

• Torshear System: The Torshear design features a splined extension and a pre-engineered shear groove above the nut. When installed with a matching counter-rotating air tool, the spline shears off automatically once the exact, predetermined tension is reached, ensuring reliable and uniform tightening without needing a manual torque wrench

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This specific promotional brochure for GKN Torshear high-strength friction-grip bolts was published in the early 1960s (circa 1960–1962).

Timeline Markers:

• The Technology: Torshear tension-control technology was originally conceptualized and patented in the UK by GKN during the late 1950s, with active marketing and major infrastructure adoption peaking in the early 1960s.

• The Status: The cover notes "Patents Applied For" directly underneath the Torshear logo, confirming it was printed right as the commercial system was being rolled out to structural engineering firms.

PB, 8 x 10", B&W illustrations, 16 pages, publication date not shown 

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