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Bumax 88 Flat Round Washer

• Metric.
• ISO 7089.

About Bumax 88

• BUMAX 88 is a premium A4 fastener that offers better corrosion resistance than standard A4 due to its higher molybdenum content.
• The PRE value of Bumax 88 is 27 and of a standard A4 only 23.
• Bumax 88 offers higher strength and lower amount of inclusions than standard A4 fasteners, which gives superior mechanical properties and fatigue resistance and fewer variations compared to standard A4.
• Bumax 88 fasteners are used in many applications that demand very low magnetic permeability, it has lower magnetic permeability and less variation from batch to batch compared to standard A4 fasteners.
• Bumax 88 is also widely used in cryogenic applications down to -269°C (4 K) and can also be provided with a pre-approval PMA for PED certificate for pressure vessels.