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Coupling Nut
We manufacturer fasteners with size range from M10 to M100 Hex Nuts, Heavy Hex Nut, Cap Nut, Acorn Nut, Serrated Flange Nut, Coupling Nut, Square Nut, Castle Nut, Wing Nut, Flange Lock Nut, Flex Lock Nut, High Nut, Kep Nut, Jam Nut, Nylon Lock Nut, Slotted Nut, Reversible Lock Nut, Custom Nut, T Nuts & other customized Nuts as per Client's requirement.We produce Hot Forged and Coled Formed Nuts Fasteners.
Coupling Nuts
Coupling Nut Applications
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 each have external threads.
Relevant Standards
Coupling nut dimensions are described by the Industrial Fasteners Institute in standard IFI-128. Chemical and mechanical properties are controlled in conformance with ASTM and SAE nut specifications (ASTM A563, ASTM A194 and SAE J995).
Materials
Standard coupling nuts are produced from ASTM A108 grade 12L14 hexagon or round bars with 50 Ksi minimum yield strength. Other available materials include 1045, 4140, structural grades and stainless steels.
Finishes
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.
Threads
Standard threads are UNC 2B, RH, with other thread series and profiles available by special order. Hot dip galvanized coupling nuts are normally tapped oversize after galvanizing to accommodate the zinc coating on the rod threads. Coupling nuts up to 1-1/2" thread size are tapped all the way through from one end, allowing them to be completely threaded on to one of the members which are to be coupled, a feature that is required for certain assembly situations. Coupling nuts larger than 1-1/2" thread size cannot be tapped all the way through without special extended length taps and are therefore furnished with RH/RH threads (tapped to a depth of L/2 from each end) unless specifically ordered as 'threaded all the way through'.
Coupling nuts can also be threaded with two different thread sizes or profiles. These parts are normally identified as 'reducing coupling nuts'.
Dimensions
Refer to the coupling nut table for dimensions. Some of the sizes listed in this table have an 'Across Flats Size' slightly larger than that called for by IF-128 due to commercial availability of hexagon bar stock. Because of limited availability of hex stock larger than 3-1/2", coupling nuts with thread sizes 2-1/2" and larger are usually made from round bar.
| Thread Diameter ‘D’ |
Width Across Flats ‘F’ |
Width Across Points ‘G’ |
Overall Length ‘L’ |
Weight Each (lbs) |
|---|---|---|---|---|
| 1/2 | 3/4 | 7/8 | 1-1/2 | 0.12 |
| 5/8 | 1 | 1-1/8 | 1-7/8 | 0.30 |
| 3/4 | 1-1/8 | 1-5/16 | 2-1/4 | 0.42 |
| 7/8 | 1-5/16 | 1-7/16 | 2-5/8 | 0.56 |
| 1 | 1-1/2 | 1-3/4 | 3 | 0.99 |
| 1-1/8 | 1-5/8 | 1-7/8 | 3-3/8 | 1.23 |
| 1-1/4 | 1-7/8 | 2-3/16 | 3-3/4 | 1.93 |
| 1-3/8 | 2 | 2-5/16 | 4-1/8 | 2.31 |
| 1-1/2 | 2-1/4 | 2-5/8 | 4-1/2 | 3.33 |
| 1-5/8 | 2-3/4 | 3-3/16 | 4-7/8 | 6.17 |
| 1-3/4 | 2-3/4 | 3-3/16 | 5-1/4 | 6.16 |
| 1-7/8 | 3 | 3-7/16 | 5-5/8 | 7.61 |
| 2 | 3-1/4 | 3-7/16 | 6 | 9.69 |
| 2-1/4 | 3-1/2 | 4-1/16 | 6-3/4 | 12.7 |
| 2-1/2 | 3-7/8 | 4-1/2 | 7-1/2 | 17.2 |
| 2-3/4 | 4-1/4 | 4-15/16 | 8-1/4 | 22.7 |
| 3 | 4-5/8 | 5-5/16 | 9 | 29.2 |
| 3-1/4 | 5 | 5-3/4 | 9-3/4 | 36.8 |
| 3-1/2 | 5-3/8 | 6-3/16 | 10-1/2 | 45.8 |
| 3-3/4 | 5-3/4 | 6-5/8 | 11-1/4 | 56.0 |
| 4 | 6-1/8 | 7-1/16 | 12 | 68.0 |
| 4-1/2 | 6-7/8 | 7-15/16 | 13-1/2 | 96.0 |
| 5 | 7-5/8 | 8-13/16 | 15 | 130.0 |
Coupling Nut Application Industries
Sunflex Metal Industries are engaged in manufacturing of robust quality of Coupling Nut. These Coupling Nut are widely used in the following industries:
Mining Industries Transport Industries- Rail and Road Construction Industries / Building Systems Manufacturing Industries Agriculture Industries Energy Industries Water Industries Automotive Industries Ship Building Industries Nuclear Power Plant Paper & Pulp Industries Sugar Industries Engineering Cement Industries Petro-Chemical Industries Food Industries Oil & Gas Industries Chemical & Pharmaceutical Industries
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