A head with no markings is grade 2, one with 3 lines spaced 120 degrees is grade 5, and 6 lines spaced at 60 degree intervals is grade 8. nuts are marked in several different ways—see identification marks for hex and heavy hex nuts below.
Tee nut or t nut, is a type of nut used to fasten a wood, particle or composite materials workpiece, leaving a flush surface. it has a long and thin body with a flange at one end, resembling a t shape. the flange of a t-nut usually have 3 or 4 hooks or serrations on the prongs that sink into a wooden work piece, providing better retention.
Hardened super-corrosion-resistant316 stainless steel threadedrods—grade b8m. these hardened 316 stainless steel threaded rods are 40% stronger than standard grade b8m threaded rods. they meet the pressure and temperature requirements of astm a193 and are often used to secure pressure tanks, valves, and flanges.
Carriage bolts are round headed bolts with an umbrella type curve used for structural applications.a carriage bolt has a square shoulder under a rounded flat head which resists turning when the nut is tightened or removed.they are good for wood-to-wood connections when the head may not be accessible for tightening.torqbolt manufactures carriage bolts as per astm a307 & din 603 …
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