YOKELINK ASTM A325M Hex Heavy Structrual Bolts and A194 2H Nuts Production Mass Order
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ASTM A325M Hex Heavy Structrual Bolts Blue A194 2H Nuts
ASTM A325M Hex Heavy Structural Bolts with A194 2H Nuts are high-strength fasteners designed for structural steel connections, typically used in bridges, buildings, and other heavy-load applications.
These bolts are made from medium carbon steel and meet the ASTM A325M standard, ensuring high tensile strength and durability, with a minimum tensile strength of 830 MPa and a yield strength of 660 MPa, classified under strength class 8.8. The accompanying A194 2H nuts, manufactured from carbon or alloy steel, are heat-treated to match the bolt's strength, providing reliable resistance to vibration loosening and high-temperature conditions.
The bolts feature a heavy hex head for enhanced wrench grip and are available in various diameters (M12 to M36) and lengths to suit different structural requirements. The assembly is often hot-dip galvanized or coated for corrosion resistance, making it suitable for harsh environments. Both components comply with international standards, ensuring consistent performance in critical load-bearing applications.
A194 A563 2H/DH Heavy Hex Nut Specification:
Why are some hex nuts blue in color?
It is often asked why some high strength hex nuts that are supplied with high strength bolts appear to be blue or some other color. This is normally the case with galvanized, high strength, heavy hex nuts and the reason for this is because of the wax lubricant applied to the nuts. According to the ASTM A563 specification, “Hot-dip and mechanically deposited zinc-coated Grade DH nuts shall be provided with an additional lubricant which shall be clean to the touch”.
The dye color is so that the presence of the lubricant is obvious and recognizable. Supplementary Requirement S2 under ASTM A563 specifies that the lubricant shall have a contrasting color to make its presence obvious, however it is not required unless specified. Since the A563 specification only requires an additional lubricant for galvanized DH nuts, Supplementary Requirement S1 can be specified, which requires that the nuts shall be provided with an additional lubricant regardless of the finish.
When lubricated A563DH nuts are supplied, they will typically possess a contrasting color, most often blue, regardless of whether or not the supplementary requirement, S2, has been specified. This makes the lubrication easy to recognize and alleviates any potential confusion. Another thing to keep in mind is that ASTM A194 2H nuts may also come with a dyed lubricated coating. The reason for this is because the ASTM A563 specification allows for A194 2H nuts as an acceptable substitute for A563DH.
Buy ASTM A563 A194 2H DH Hex Heavy Nut From Yokelink
Yokelink Hex nuts are used to fasten attachments to machine bolts, carriage bolts, Insulator pins and other bolts. Galvanized hex nuts are tapped oversize to compensate for the corrosion resistant coating on the bolts.
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. Nuts up to and including 1-inch nominal size shall be UNC Series Class 2B fit. Nuts over 1-inch nominal size shall be either UNC Series Class 2B fit or 8 UN Series Class 2B fit. High strength ASTM A194 grade 2H nuts are common in the marketplace and are often substituted for ASTM A563 grade DH nuts due to the limited availability of
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