IIS Flange Washer are design relative to most Belleville spring designs is that the ODID ratio is small to fit standard flanges. IIS Flange Washer prevent bolt tension loss due to : H13 Tool Steel is the main material for this product group, with a working temperature to 1000°F. Materials, such as 17-7 PH Stainless Steel and INCONEL 718 and X-750 Alloys, are also available. H13 flange bolting is available at 30,000, 4000, and 60,000 psi bolt stress.
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