SS Coupling Nut
SS Coupling Nut
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18-8 stainless steel hex coupling nuts are made from one of the following austenitic alloys: 303, 303Se, 304, XM7, all of which are characterized as having a chromium content of 17-19% and nickel content of 8-10%. Dimensional specifications are governed by ASME B18.2.2. There are no grade markings on 18-8 stainless hex coupling nuts. Coupling nuts, also known as extension nuts, are used for joining two male threads, usually threaded rods, in a variety of applications. 300 series stainless steel fasteners are commonly used in applications that require general atmospheric corrosion resistance, such as chemical and food processing equipment. Stainless steel has a higher corrosion resistance than carbon steel.
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Governing Standards
| ASME B18.2.2 | Covers the complete general and dimensional data for the various types of inch series square and hex nuts, including machine screw nuts and coupling nuts. |
| ASME B1.1 UNC & UNF Class 2B | Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads. |
18-8 Stainless Steel requires no material marking
Dimensional Specifications
| Per ASME B18.2.2-2015 | |||||
| Nominal Diameter | UNC | UNF | F | G | |
| Flat to Flat | Thickness | ||||
| #4 | 0.1380 | 40 | 48 | 5/16 | 7/16 |
| #6 | 0.1380 | 32 | 40 | 5/16 | 1/2 |
| #8 | 0.1640 | 32 | 38 | 5/16 | 1/2 |
| #10 | 0.1900 | 24 | 32 | 3/8 | 3/4 |
| 1/4 | 0.2500 | 20 | 28 | 3/8 | 7/8 |
| 5/16 | 0.3125 | 18 | 28 | 7/16 | 1 |
| 3/8 | 0.3750 | 16 | 24 | 1/2 | 1 1/8 |
| 7/16 | 0.4375 | 14 | 20 | 9/16 | 1 1/4 |
| 1/2 | 0.5000 | 13 | 20 | 5/8 | 1 1/4 |
| 5/8 | 0.6250 | 11 | 18 | 0.875 | 1 3/4 |
| 3/4 | 0.7500 | 10 | 16 | 1 | 2 |
| 7/8 | 0.8750 | 9 | 14 | 1 1/4 | 2 1/2 |
| 1 | 1.0000 | 8 | 12 | 1 3/8 | 2 1/2 |
| 1 1/8 | 1.1250 | 7 | 12 | 1 1/2 | 3 |
| 1 1/4 | 1.2500 | 7 | 12 | 1 5/8 | 3 |
| 1 1/2 | 1.5000 | 6 | 12 | 2 | 3 1/2 |
- All dimensions are in inches.