What does 2H mean on a nut?
The 2H hex nut bears a clear mark on the fastener face, indicating the grade (2H). The grade 2H designation signifies nut formation, including the method of heat treatment, quenching, and temperature range required for tempering.
Is ASTM A194 Grade 2H stainless steel?
ASTM A194 covers carbon steel, alloy steel, and stainless steel nuts for bolts in high pressure or high temperature service. Grade markings consists of both the grade symbol “2H” and the manufacturer’s identification mark.
What does A194 mean?
The ASTM A194 specification covers carbon, alloy, and stainless steel nuts intended for use in high-pressure and/or high-temperature service. Unless otherwise specified, the American National Standard Heavy Hex Series (ANSI B 18.2. 2) shall be used.
What is the difference between 2H and 2HM nuts?
Both 2H and 2HM nuts have the same chemical composition. Grade 2H nuts have a higher proof load requirement.
What is the difference between 2H and DH nuts?
Both ASTM A194 Grade 2H nuts and ASTM A563 grade DH nuts are high strength nuts that undergo a heat treating process required to develop their strength characteristics. However, they are not necessarily interchangeable. An A194 Grade 2H nut can always be substituted for an A563 Grade DH nut.
How are hex nuts marked for strength?
– Hex nuts shall be marked by an indentation on the side or the bearing surface or by an embossment on the chamfer of the hex nut. Embossed markings must not protrude beyond the bearing surface of the nut.
Is A194 stainless steel?
The ASTM A194 specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1⁄4 through 4 in.
What is ASTM A193 Grade B7?
ASTM A193 Grade B7 is a standard material specification for chromium-molybdenum alloy steel fasteners for use in high tensile, high temperature and special purpose applications.
What is Grade 2H steel?
2H. This is a high pressure and temperature grade nut made of medium carbon steel that has been quenched and tempered. This grade meets ASTM specification A 194. These nuts are also used in flanges and fittings as well as in heavy construction of buildings and bridges.
What is Grade C nuts?
C. This nut grade denotation is for nuts that are used in heavy construction. They are marked with three curved lines around the central hole. This grade meets ASTM A563 specifications and is commonly used with ASTM A325 and ASTM A354 bolts.
What grade is a structural nut?
The category of “structural nuts” includes heavy hex nuts that meet ASTM A194 GR. 2H, ASTM A563 GR. C, and ASTM A563 GR.
What is ASTM A216?
ASTM A216. STANDARD SPECIFICATION FOR STEEL CASTINGS, CARBON, SUITABLE FOR FUSION WELDING, FOR HIGH-TEMPERATURE SERVICE.
What does ASTM A194 grade 2H mean?
ASTM A194 Grade 2H Specification for high tensile nuts and other internally threaded fasteners, made from heat treated carbon steel. ASTM A194 Grade 2H is a standard material specification for high tensile nuts and other internally threaded fasteners, made from carbon steel.
What is A194 GR 2H heavy hex nut?
The a194 2h material, which in this case is a carbon steel alloy could be further processed by centerless grinding process or by a cold drawing process. Per the specification, the alloy of the ASME SA 194 Gr 2H Heavy Hex Nut is required to conform to the chemical composition that has been prescribed.
What is the size range of ASME SA 194 grade 2H hex nuts?
The size range of the ASME SA 194 Grade 2H Heavy Hex Nuts is between ¼ inch through 4 inches and its metric size ranges between M6 through M100 nominal. SA 194 Gr 2H Lock Nut dimensions also covers nuts manufactured from austenitic stainless steel grades in the size range 1⁄4 inch along with the M6 nominal and above.
What is a Grade 2H nut?
Grade 2H nuts can be produced by means of hot forging, cold forging or machining from heat treated bar stock. ASTM A194 specification covers requirements for chemical composition, heat treatment, hardness, proof load, etc., for Grade 2H nuts. AThe intentional addition of Bi, Se, Te, and Pb is not permitted. 2H, Over 1-1/2″ Inch.
