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Use Recommendations O-Ring Guage Make WorkSmart Measure Easily O-Ring Size Standard BS1806 / AS-568 O-ring sizes 001-050 102-178 201-279 309-382 425-455 Features FUSHI O-ring Gauge With this handy gadget, it's easy to determine the size of almost any British Standard size O-ring. Section size is identified by using the slots at the top. The BS size number of small O-rings can be found by matching them with the silhouettes along the sides of the gauge. Larger O-rings are placed around the two halves of the appropriate spindles at the top of the gauge. The slide is then extended until it is taut, and the BS size number is shown in one of the small windows near the top of the main body. Used to determine the size of standard BS1806 or AS-568 O-rings Section size identified by using the slots at the top Note: Gauge has metric and imperial scales O-Ring Tools O-Ring gauge and material tools to assist maintenance personnel with their O-Ring selection, installation, and checking requirements. Additional O-Ring replacement stainless steel hand tools are also available (RS stock no. 227-0071).