Also known as conical washers, these have a slightly cupped shape that gives them spring-like flexibility to grip tighter than split and tooth lock washers. they minimize loosening from wear, temperature changes, and vibration.
Non-metal bolts and screws are even more limited in strength than aluminum ones, but they're still a good option for medical and food-manufacturing applications. for most applications, a coated or galvanized steel fastener is the best option for pairing with aluminum. but the options don't stop there. not sure which grade or type of steel you need?
Carriage bolts. round heads and square necks, also the less common ribbed neck. available in steel, grade 5, grade 8 & stainless. ... most common type of hex bolt. available in grade 2, grade 5, grade 8 & stainless steel. ... square head machine bolts are used for the same applications as standard hex bolts but are increasingly common for use ...
Rubber-cushioned square u-bolts. reduce vibration and prevent metal-to-metal corrosion on flat-bottomed objects such as strut channel and small duct. secure with hex nuts (sold separately). zinc-plated steel u-bolts have good corrosion resistance in most environments. 304 stainless steel u-bolts have excellent corrosion resistance and good chemical resistance.
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