ANSI ASME IFI B18.2.2 Hex Coupling nuts Heavy Hex Coupling nuts 1/2 to 4inch A563 (grades A, C, and DH), A194 grade 2H

Specification

     Coupling nuts (also known as a rod coupling, rod coupling nut, coupler nut, or extension nut), is a threaded fastener for joining two male threads, most commonly threaded rods. The outside surface of the coupling nut is usually a hex shape to allow for wrench tightening. Reducing coupling nuts are a variant design that allows the joining of two rods of differing thread sizes.

Trust QBH fastener with supplying your metric and SAE coupling nuts. We provide a wide range of sizes and finishes including hot dipped galvanized, plain and zinc. Please contact us today if you can’t find the exact product or size needed as we have many products not listed on our website.

    Coupling Nuts are used to make up long tie rod assemblies from shorter lengths of rod and to facilitate assembly of two fasteners or fittings which both have external threads. Coupling nut dimensions are described by the Industrial Fasteners Institute, in IFI-128.

Dimensions

Coupling Nuts

NOTES REGARDING STRENGTH

*When high strength rods are specified, coupling nuts produced to meet ASTM A563 grade DH and A194 grade 2H can be provided. These parts will meet all of the chemical and mechanical properties called for in those specifications.

Process flow

Cold forging

Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ tapping ➨make heat treatment(if need) ➨ Finish ➨ Packing

Hot forging

Cutting material ➨ hot forging ➨ turning ➨ tapping ➨ make heat treatment(if need) ➨ Finish ➨ Packing

Product Grade

Grade 2 Grade 5 Grade 8

Materials and Chemical compstition

1008

1035

10B21

1045

40CR

35CRMO

42CRMO

FINISH

Standard finish is plain, with either a cold drawn or hot rolled mill finish, depending on the type of bar stock used. Hot Dip Galvanizing is available, as well as zinc electroplating.

PACKING

QBH BULK

20-25KG/CTN,36CTNS/PALLET

20-30KG/BAGS,36BAGS/PALLET

ONE TON/BOXES

50KG/ IRON DRUM,12 IRON DRUMS/PALLET

QBH SMALL PACKING

Packing in small boxes according to customer’s requirements

Packing in plastic bag according to customer’s requirements

QBH PALLET TYPE

SOLID WOOD FUMIGATION PALLET

EURO Pallet

THREE SPLINT PALLET

WOODEN BOX

Mechanical property

The advantages of QBH

• QBH brand sales to the main quality assurance.
• Years of export trade management, excellent service, word-of-mouth guarantee.
• By working with TUV,escort for quality.
• Customization of non-standard parts can be made according to customer's requirements and drawings.
• For quality customers,we can provide a certain credit period.

Product application

     Hex couplers are used to connect two pieces of threaded material. Hex and heavy hex couplers are threaded right hand. If a right hand-left hand coupler is needed, consider using a sleeve nut.

See our nut compatibility chart to determine the compatible hex coupler for a specific grade of bolt. Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized couplers are tapped oversize to compensate for the corrosion resistant coating on the bolts.