A563 Heavy Hex Nuts Dh with Blue Wax

•Material & Heat Treatment: Made from quenched and tempered medium carbon steel, meeting the ASTM A563 Grade DH high-strength standard, with tensile and proof loads far exceeding ordinary nuts.

•Heavy Hex Design: Larger width across flats and height, providing a larger bearing surface and stronger torsion resistance, suitable for high torque and heavy loads to reduce stress concentration.

•Coarse Thread: Deep engagement, stronger shear and pull-out resistance, matching high-strength structural bolts such as A325 and A490.

•Long-Lasting Corrosion Protection (Hot-Dip Galvanizing): Thick zinc layer ensures long rust-proof service life in outdoor, humid or corrosive environments (coastal, industrial, underground).

•Smooth Installation (Wax Layer): Lubricates threads, reduces friction, prevents galling, and stabilizes torque, improving assembly efficiency.

• Easy On-Site Identification (Blue Dye): Blue marking allows quick differentiation between DH grade and other specifications, reducing misinstallation and facilitating quality inspection.

•Consistent Torque-Tension Relationship: The wax layer enables more accurate preload control and higher connection reliability.

•Strong Compatibility: Perfectly matches high-strength bolts/threaded rods such as A325, A490, B7, and A307 Grade B.

• Compliance: Conforms to ASTM A563, AISC, IFI and other structural specifications, suitable for critical engineering projects.

Main packaging materials include: small bags, small boxes, cartons, pallets and iron drums.

Customized packaging is available according to customer requirements.

Flexible bulk ordering plans are provided, and both transportation terms and delivery schedules are negotiable.

We are certified by ISO9001:2015, IATF16949:2016, and other international quality standard certifications.

Long-term quality warranty and comprehensive after-sales service are provided.