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.
Grade:a2 a4. application:solar energy. packing:cartons+pallets. delivery time:10-30 days. standard:din,astm/asme,jis,en,iso,as,gb. size:100-300mm. inquire. more >>. stainless steel 201/304 m12 300mm long solar dowel screw/ hanger bolt with epdm washer.
Astm a193 grade b7. astm a193 grade b7 is a standard specification for high tensile chromium molybdenum alloy steel bolting material for use in high temperature or high-pressure service and other special purpose applications. it covers material specification for bolting used in pressure vessel service, valves, flanges and fittings. astm a193 defines both si (metric) and inch-pound …
Taper washers are used in conjunction with bolting products on steelwork to provide a flat plane under fastener heads for sloping webs, sections etc. butler fasteners limited in nottingham supply both 'd' type malleable iron taper washers and mild steel square taper washers. d type taper washers5° taper size size size m103/8" m165/8" m241" m121/2" m203/4" m30…
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