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Spheric Trafalgar

Single and Double Ended Plug Gauges

Options (mm)
Go +2.0µmNo Go -2.0µm Go +1.0µmNo Go -1.0µm Go +0.5µmNo Go -0.5µm Options (inches)
Go +0.00008"No Go -0.00008" Go +0.00004"No Go -0.00004" Go +0.00002"No Go -0.00002" Ball Plug Gauges have many advantages over conventional Plug Gauges. They are quick and easy to use because they can be inserted at any angle. Due to the very small contact area of the ball, very good "feel" is imparted to the inspector and any roughness is easily detected. They are very effective in detecting any bell mouthing or taper in the hole. Tungsten Carbide Balls offer rugged resistance to impact, wear, temperature, humididty and corrosion. Our standard tolerances are +2.0µm (0.00008") on the "Go" end and -2.0µm (0.00008") on the "No Go" end. However tighter tolerances are available at extra cost. The Spheric-Trafalgar UKAS Laboratory can supply full Certification. Handles can be engraved to your own requirements listing Part Numbers etc. All stems are made from high quality stainless steel. Construction Details For ball sizes 5/32" (4mm) and above, the stem is inserted into a hole spark eroded into the ball and fixed using a specially developed Spheric-Trafalgar adhesive. Below 5/32" (4mm), the balls are brazed to the stems.