Metric Heavy Hex Head Structural Bolt, ASTM A325 A490 Heavy Hex Bolts, Hot dip galvanized 8.8 heavy hex bolt for electric equipment Finish: ZINC, Plain Material: Steel, carbon steel Standard: DIN FINISHED: Black,ZINC HDG,Dacroment. PLAIN SIZE: M45,M4,M12 M72,M56 M3.5 LENGTH: 60MM-300MM GRADE: 4.8,6.8 8.8 10.9 TYPE: hexagon bolt customized Certificate: ISO9001 Metric Heavy Hex Head […]
Hardware Fastener Bolts, Home Commercial and Industrial Bolt, Hexagon head bolts, Hex head bolts, DIN933, DIN931, ASME B18.2.1, ISO 4017, ISO 4014, IFI 149 Grade Bolts Standard Hardware Fastener
Hardware Fastener Bolts
Material : Monel, Incone, Hastelloy, 1.4529, AL6XN, 254SMO,Duplex and Super duplex
304 304L 347 316 316L 1.4404 321 1.4541
316Ti 1.4571 S31635 317L 1.4438
254SMO 1.4547 UNS S31254 F44 654SMO 1.4652 S32654
AL6XN UNS N08367 310S 1.4841 309S 2205 S31803 F51 A182 1.4462 duplex 2507 S327501.4410 F53 S32760
Monel400 UNS N044002.4360 Alloy400 Monelk500 AlloyK500 UNS N05500 2.4375
Alloy59 UNS N06059 2.4605
Inconel718 UNS N07718 2.4668 GH169 GH4169 724L 725LN 309S 1.4833 Hastelloy C276
UNS N10276 2.4819 NS333 2.4602
UNS N06022 Hastelloy B2 C22 Hastelloy C4 UNS N06455 2.4610
GH2132 A286 316Ti Inconel625 Alloy59
Inconel600 Inconel925 Inconel825 UNS N08825 Alloy825 2.4858
GH3030 Alloy20 SUS347 17-4PH Alloy800
Bolts use a wide variety of head designs, as do screws. These are designed to engage with the tool used to tighten them. Some bolt heads instead lock the bolt in place, so that it does not move and a tool is only needed for the nut end.
Common bolt heads include hex, slotted hex washer, and socket cap.
The first bolts had square heads, formed by forging. These are still found, although much more common today is the hexagonal head. These are held and turned by a spanner or wrench, of which there are many forms. Most are held from the side, some from in-line with the bolt. Other bolts have T-heads and slotted heads.
Many screws use a screwdriver head fitting, rather than an external wrench. Screwdrivers are applied in-line with the fastener, rather than from the side. These are smaller than most wrench heads and cannot usually apply the same amount of torque. It is sometimes assumed that screwdriver heads imply a screw and wrenches imply a bolt, although this is incorrect. Coach screws are large square-headed screws with a tapered wood screw thread, used for attaching ironwork to timber.
Head designs that overlap both are the Allen or Torx heads; hexagonal or splined sockets. These modern designs span a large range of sizes and can carry a considerable torque.