Coupling Nuts

622 products

Coupling Nuts

Coupling Nuts are elongated fasteners designed to connect two threaded rods, pipes, or fittings end-to-end in applications requiring extended length or alignment adjustment. At Skdin, we offer high-quality Coupling Nuts in various lengths, diameters, and materials, including carbon steel, stainless steel, and brass variants. Our coupling nuts feature internal threading throughout their entire length, providing a secure connection point for joining threaded components while maintaining proper alignment and load distribution. These nuts are essential for construction, plumbing, and industrial applications where extended threaded connections are required. Explore our selection to find the perfect coupling nuts for your specific connection requirements.

System of Measurement
Inch Metric
Thread Size
0-80 1 1/2"-12 1 1/2"-6 1 1/4"-12 1 1/4"-7 1 1/8"-7 1 3/4"-5 1 3/8"-6 1"-14 1"-8 1-72 1/2"-13 1/2"-20 1/2"-28 1/4"-20 1/4"-28 10-24 10-32 12-24 2 1/2"-4 2 1/4"-4 1/2 2"-4 1/2 2-56 3-48 3/4"-10 3/4"-16 3/8"-16 3/8"-24 3/8"-32 4-40 5-40 5/16"-18 5/16"-24 5/8"-11 5/8"-18 6-32 7/16"-14 7/16"-20 7/8"-14 7/8"-9 8-32 9/16"-12 9/16"-18 M10 M12 M14 M16 M18 M2 M2.5 M20 M22 M24 M27 M3 M3.5 M30 M33 M36 M4 M5 M6 M8
Material
18-8 Stainless Steel 316 Stainless Steel 6061 Aluminum Black-Oxide 18-8 Stainless Steel Black-Oxide Steel Brass Hot-Dipped Galvanized Steel Nylon 6/6 Plastic Steel Zinc-Flake-Coated Steel Zinc-Plated Steel
Nut Type
Coupling Coupling, Hex Coupling;Hex
Width
1/8" 3/16" 1/4" 5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 11/16" 3/4" 13/16" 7/8" 15/16" 1" 1 1/16" 1 1/8" 1 1/4" 1 5/16" 1 3/8" 1 7/16" 1 1/2" 1 5/8" 1 3/4" 1 7/8" 2" 2 1/4" 2 3/8" 2 3/4" 3 1/8" 3 1/4" 3 1/2" 4" 4 mm 4.5 mm 5 mm 6 mm 7 mm 8 mm 10 mm 13 mm 14 mm 16 mm 17 mm 17.5 mm 19 mm 22 mm 24 mm 27 mm 30 mm 32 mm 36 mm 38 mm 41 mm 46 mm 50 mm 55 mm
Thread Type
Metric UNC UNEF UNF UNS
Thread Direction
Left Hand Right Hand
Thread Pitch
0.4 mm 0.45 mm 0.5 mm 0.6 mm 0.7 mm 0.8 mm 1 mm 1.25 mm 1.5 mm 1.75 mm 2 mm 2.5 mm 3 mm 3.5 mm 4 mm
Length
1/4" 5/16" 3/8" 7/16" 15/32" 1/2" 5/8" 11/16" 3/4" 7/8" 15/16" 1" 1 1/8" 1 1/4" 1 1/2" 1 5/8" 1 3/4" 1 7/8" 2" 2 1/8" 2 1/4" 2 1/2" 2 3/4" 3" 3 1/2" 4" 4 1/2" 5" 5 1/4" 6" 7" 7 1/2" 8" 8 1/2" 9" 9 1/2" 10" 6 mm 9 mm 10 mm 12 mm 15 mm 16 mm 18 mm 19 mm 20 mm 24 mm 25 mm 30 mm 32 mm 36 mm 40 mm 42 mm 48 mm 50 mm 51 mm 54 mm 60 mm 64 mm 66 mm 72 mm 81 mm 90 mm 96 mm 99 mm 108 mm 120 mm 132 mm 144 mm
Threading
Fully Threaded Partially Threaded
Fastener Strength Grade/Class
ASTM Grade 2H Class 10 Class 8 Grade 2 Grade 5 Grade 8
OD
19/64" 23/64" 27/64" 31/64" 37/64" 55/64" 63/64" 8 mm 10 mm 11 mm 13 mm 15 mm 18 mm 22 mm 28 mm
Sight Hole Diameter
1/16" 5/64" 3/32" 1/8" 3/16" 1/4"
Show more▼
Part Number Thread Size Length Threading Thread Type Thread Fit Thread Direction Drive Style Width Material Nut Type
0990FA00008 M2 6 mm Fully Threaded Metric Class 6H Right Hand External Hex 4 mm Nylon 6/6 Plastic Coupling, Hex
0988FA00014 M2 6 mm Fully Threaded Metric Class 6H Right Hand External Hex 4.5 mm 6061 Aluminum Coupling, Hex
0977FA00001 M2 6 mm Fully Threaded Metric Class 6H Right Hand External Hex 4.5 mm Black-Oxide Steel Coupling, Hex
0977FA00029 M2 6 mm Fully Threaded Metric Class 6H Right Hand External Hex 4.5 mm Zinc-Plated Steel Coupling, Hex
0993FA00017 M2 12 mm Fully Threaded Metric Class 6H Right Hand External Hex 4.5 mm Zinc-Plated Steel Coupling, Hex
0985FA00002 M2.5 6 mm Fully Threaded Metric Class 6H Right Hand External Hex 4 mm 18-8 Stainless Steel Coupling, Hex
0985FA00019 M2.5 6 mm Fully Threaded Metric Class 6H Right Hand External Hex 4 mm Black-Oxide 18-8 Stainless Steel Coupling, Hex
0977FA00002 M2.5 6 mm Fully Threaded Metric Class 6H Right Hand External Hex 4.5 mm Black-Oxide Steel Coupling, Hex
0990FA00009 M2.5 6 mm Fully Threaded Metric Class 6H Right Hand External Hex 4.5 mm Nylon 6/6 Plastic Coupling, Hex
0977FA00030 M2.5 6 mm Fully Threaded Metric Class 6H Right Hand External Hex 4.5 mm Zinc-Plated Steel Coupling, Hex
0993FA00018 M2.5 12 mm Fully Threaded Metric Class 6H Right Hand External Hex 4.5 mm Zinc-Plated Steel Coupling, Hex
0991FA00018 M20 50 mm Fully Threaded Metric Class 6H Right Hand - - 18-8 Stainless Steel Coupling
0977FA00016 M20 51 mm Fully Threaded Metric Class 6H Right Hand External Hex 32 mm Black-Oxide Steel Coupling, Hex
0985FA00011 M20 60 mm Fully Threaded Metric Class 6H Right Hand External Hex 30 mm 18-8 Stainless Steel Coupling, Hex
0987FA00008 M20 60 mm Fully Threaded Metric Class 6H Right Hand External Hex 30 mm 316 Stainless Steel Coupling;Hex
0980FA00023 M20 60 mm Fully Threaded Metric Class 6H Right Hand External Hex 30 mm Black-Oxide Steel Coupling, Hex
0989FA00042 M20 60 mm Fully Threaded Metric Class 6H Right Hand External Hex 30 mm Brass Coupling, Hex
0982FA00014 M20 60 mm Fully Threaded Metric Class 6H Right Hand External Hex 30 mm Steel Coupling, Hex
0980FA00006 M20 60 mm Fully Threaded Metric Class 6H Right Hand External Hex 30 mm Zinc-Plated Steel Coupling, Hex
0982FA00007 M20 60 mm Fully Threaded Metric Class 6H Right Hand External Hex 30 mm Zinc-Plated Steel Coupling, Hex
0977FA00027 M20 60 mm Fully Threaded Metric Class 6H Right Hand External Hex 30 mm Zinc-Plated Steel Coupling, Hex
0992FA00051 M20 120 mm Partially Threaded Metric Class 6H Right Hand External Hex 30 mm 18-8 Stainless Steel Coupling, Hex
0985FA00014 M22 66 mm Fully Threaded Metric Class 6H Right Hand External Hex 32 mm 18-8 Stainless Steel Coupling, Hex
0977FA00008 M22 66 mm Fully Threaded Metric Class 6H Right Hand External Hex 32 mm Black-Oxide Steel Coupling, Hex
0980FA00013 M22 66 mm Fully Threaded Metric Class 6H Right Hand External Hex 32 mm Zinc-Plated Steel Coupling, Hex
0977FA00034 M22 66 mm Fully Threaded Metric Class 6H Right Hand External Hex 32 mm Zinc-Plated Steel Coupling, Hex
0992FA00052 M22 132 mm Partially Threaded Metric Class 6H Right Hand External Hex 30 mm 18-8 Stainless Steel Coupling, Hex
0977FA00018 M24 64 mm Fully Threaded Metric Class 6H Right Hand External Hex 38 mm Black-Oxide Steel Coupling, Hex
0985FA00015 M24 72 mm Fully Threaded Metric Class 6H Right Hand External Hex 36 mm 18-8 Stainless Steel Coupling, Hex
0987FA00009 M24 72 mm Fully Threaded Metric Class 6H Right Hand External Hex 36 mm 316 Stainless Steel Coupling;Hex
0980FA00024 M24 72 mm Fully Threaded Metric Class 6H Right Hand External Hex 36 mm Black-Oxide Steel Coupling, Hex
0989FA00043 M24 72 mm Fully Threaded Metric Class 6H Right Hand External Hex 36 mm Brass Coupling, Hex
0982FA00015 M24 72 mm Fully Threaded Metric Class 6H Right Hand External Hex 36 mm Steel Coupling, Hex
0980FA00007 M24 72 mm Fully Threaded Metric Class 6H Right Hand External Hex 36 mm Zinc-Plated Steel Coupling, Hex
0982FA00008 M24 72 mm Fully Threaded Metric Class 6H Right Hand External Hex 36 mm Zinc-Plated Steel Coupling, Hex
0977FA00028 M24 72 mm Fully Threaded Metric Class 6H Right Hand External Hex 36 mm Zinc-Plated Steel Coupling, Hex
0992FA00053 M24 144 mm Partially Threaded Metric Class 6H Right Hand External Hex 41 mm 18-8 Stainless Steel Coupling, Hex
0985FA00016 M27 81 mm Fully Threaded Metric Class 6H Right Hand External Hex 41 mm 18-8 Stainless Steel Coupling, Hex
0977FA00009 M27 81 mm Fully Threaded Metric Class 6H Right Hand External Hex 41 mm Black-Oxide Steel Coupling, Hex
0982FA00009 M27 81 mm Fully Threaded Metric Class 6H Right Hand External Hex 41 mm Zinc-Plated Steel Coupling, Hex
0977FA00035 M27 81 mm Fully Threaded Metric Class 6H Right Hand External Hex 41 mm Zinc-Plated Steel Coupling, Hex
0985FA00003 M3 9 mm Fully Threaded Metric Class 6H Right Hand External Hex 5 mm 18-8 Stainless Steel Coupling, Hex
0985FA00020 M3 9 mm Fully Threaded Metric Class 6H Right Hand External Hex 5 mm Black-Oxide 18-8 Stainless Steel Coupling, Hex
0989FA00034 M3 9 mm Fully Threaded Metric Class 6H Right Hand External Hex 5 mm Brass Coupling, Hex
0990FA00010 M3 9 mm Fully Threaded Metric Class 6H Right Hand External Hex 5 mm Nylon 6/6 Plastic Coupling, Hex
0988FA00015 M3 9 mm Fully Threaded Metric Class 6H Right Hand External Hex 6 mm 6061 Aluminum Coupling, Hex
0977FA00003 M3 9 mm Fully Threaded Metric Class 6H Right Hand External Hex 6 mm Black-Oxide Steel Coupling, Hex
0977FA00031 M3 9 mm Fully Threaded Metric Class 6H Right Hand External Hex 6 mm Zinc-Plated Steel Coupling, Hex
0993FA00019 M3 18 mm Fully Threaded Metric Class 6H Right Hand External Hex 6 mm Zinc-Plated Steel Coupling, Hex
0977FA00004 M3.5 10 mm Fully Threaded Metric Class 6H Right Hand External Hex 6 mm Black-Oxide Steel Coupling, Hex
0977FA00032 M3.5 10 mm Fully Threaded Metric Class 6H Right Hand External Hex 6 mm Zinc-Plated Steel Coupling, Hex
0990FA00011 M3.5 10 mm Fully Threaded Metric Class 6H Right Hand External Hex 10 mm Nylon 6/6 Plastic Coupling, Hex
0993FA00020 M3.5 18 mm Fully Threaded Metric Class 6H Right Hand External Hex 6 mm Zinc-Plated Steel Coupling, Hex
0985FA00017 M30 90 mm Fully Threaded Metric Class 6H Right Hand External Hex 46 mm 18-8 Stainless Steel Coupling, Hex
0980FA00025 M30 90 mm Fully Threaded Metric Class 6H Right Hand External Hex 46 mm Black-Oxide Steel Coupling, Hex
0977FA00010 M30 90 mm Fully Threaded Metric Class 6H Right Hand External Hex 46 mm Black-Oxide Steel Coupling, Hex
0982FA00016 M30 90 mm Fully Threaded Metric Class 6H Right Hand External Hex 46 mm Steel Coupling, Hex
0980FA00008 M30 90 mm Fully Threaded Metric Class 6H Right Hand External Hex 46 mm Zinc-Plated Steel Coupling, Hex
0982FA00005 M30 90 mm Fully Threaded Metric Class 6H Right Hand External Hex 46 mm Zinc-Plated Steel Coupling, Hex
0977FA00036 M30 90 mm Fully Threaded Metric Class 6H Right Hand External Hex 46 mm Zinc-Plated Steel Coupling, Hex
0985FA00028 M33 99 mm Fully Threaded Metric Class 6H Right Hand External Hex 50 mm 18-8 Stainless Steel Coupling, Hex
0985FA00029 M36 108 mm Fully Threaded Metric Class 6H Right Hand External Hex 55 mm 18-8 Stainless Steel Coupling, Hex
0977FA00011 M36 108 mm Fully Threaded Metric Class 6H Right Hand External Hex 55 mm Black-Oxide Steel Coupling, Hex
0982FA00017 M36 108 mm Fully Threaded Metric Class 6H Right Hand External Hex 55 mm Steel Coupling, Hex
0977FA00037 M36 108 mm Fully Threaded Metric Class 6H Right Hand External Hex 55 mm Zinc-Plated Steel Coupling, Hex
0985FA00004 M4 12 mm Fully Threaded Metric Class 6H Right Hand External Hex 7 mm 18-8 Stainless Steel Coupling, Hex
0985FA00021 M4 12 mm Fully Threaded Metric Class 6H Right Hand External Hex 7 mm Black-Oxide 18-8 Stainless Steel Coupling, Hex
0980FA00014 M4 12 mm Fully Threaded Metric Class 6H Right Hand External Hex 7 mm Black-Oxide Steel Coupling, Hex
0977FA00005 M4 12 mm Fully Threaded Metric Class 6H Right Hand External Hex 7 mm Black-Oxide Steel Coupling, Hex
0989FA00035 M4 12 mm Fully Threaded Metric Class 6H Right Hand External Hex 7 mm Brass Coupling, Hex
0980FA00009 M4 12 mm Fully Threaded Metric Class 6H Right Hand External Hex 7 mm Zinc-Plated Steel Coupling, Hex
0977FA00019 M4 12 mm Fully Threaded Metric Class 6H Right Hand External Hex 7 mm Zinc-Plated Steel Coupling, Hex
0988FA00016 M4 12 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm 6061 Aluminum Coupling, Hex
0990FA00012 M4 12 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm Nylon 6/6 Plastic Coupling, Hex
0991FA00001 M4 20 mm Fully Threaded Metric Class 6H Right Hand - - 18-8 Stainless Steel Coupling
0993FA00021 M4 24 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm Zinc-Plated Steel Coupling, Hex
0992FA00044 M4 24 mm Partially Threaded Metric Class 6H Right Hand External Hex 6 mm 18-8 Stainless Steel Coupling, Hex
0985FA00005 M5 15 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm 18-8 Stainless Steel Coupling, Hex
0987FA00001 M5 15 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm 316 Stainless Steel Coupling;Hex
0988FA00017 M5 15 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm 6061 Aluminum Coupling, Hex
0985FA00022 M5 15 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm Black-Oxide 18-8 Stainless Steel Coupling, Hex
0980FA00015 M5 15 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm Black-Oxide Steel Coupling, Hex
0977FA00006 M5 15 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm Black-Oxide Steel Coupling, Hex
0989FA00036 M5 15 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm Brass Coupling, Hex
0990FA00013 M5 15 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm Nylon 6/6 Plastic Coupling, Hex
0980FA00010 M5 15 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm Zinc-Plated Steel Coupling, Hex
0977FA00020 M5 15 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm Zinc-Plated Steel Coupling, Hex
0991FA00002 M5 20 mm Fully Threaded Metric Class 6H Right Hand - - 18-8 Stainless Steel Coupling
0993FA00022 M5 30 mm Fully Threaded Metric Class 6H Right Hand External Hex 8 mm Zinc-Plated Steel Coupling, Hex
0992FA00045 M5 30 mm Partially Threaded Metric Class 6H Right Hand External Hex 8 mm 18-8 Stainless Steel Coupling, Hex
0977FA00012 M6 16 mm Fully Threaded Metric Class 6H Right Hand External Hex 13 mm Black-Oxide Steel Coupling, Hex
0985FA00006 M6 18 mm Fully Threaded Metric Class 6H Right Hand External Hex 10 mm 18-8 Stainless Steel Coupling, Hex
0987FA00002 M6 18 mm Fully Threaded Metric Class 6H Right Hand External Hex 10 mm 316 Stainless Steel Coupling;Hex
0988FA00018 M6 18 mm Fully Threaded Metric Class 6H Right Hand External Hex 10 mm 6061 Aluminum Coupling, Hex
0985FA00023 M6 18 mm Fully Threaded Metric Class 6H Right Hand External Hex 10 mm Black-Oxide 18-8 Stainless Steel Coupling, Hex
0980FA00016 M6 18 mm Fully Threaded Metric Class 6H Right Hand External Hex 10 mm Black-Oxide Steel Coupling, Hex
0989FA00037 M6 18 mm Fully Threaded Metric Class 6H Right Hand External Hex 10 mm Brass Coupling, Hex
0990FA00014 M6 18 mm Fully Threaded Metric Class 6H Right Hand External Hex 10 mm Nylon 6/6 Plastic Coupling, Hex
0980FA00001 M6 18 mm Fully Threaded Metric Class 6H Right Hand External Hex 10 mm Zinc-Plated Steel Coupling, Hex
0982FA00001 M6 18 mm Fully Threaded Metric Class 6H Right Hand External Hex 10 mm Zinc-Plated Steel Coupling, Hex
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