Luke Steel, a reputable producer and supplier of carbon steel nuts with its headquarters located in Houston, Houstan, provides high-performance fastening solutions for mechanical, structural, and industrial applications. These nuts are made from premium carbon steel and are precisely engineered to satisfy a number of ASTM and DIN standards, guaranteeing their strength, durability, and resistance to corrosion. Luke Steel produces carbon steel nuts in a range of sizes, threads, and finishes by combining sophisticated machining methods with stringent quality control. Our products offer safe and dependable fastener performance in demanding environments to customers in the manufacturing, construction, oil and gas, and automotive sectors.
Typically, low to medium carbon steel with a carbon content of 0.10 to 0.50 percent, manganese (0.60% to 1.65%), and trace amounts of sulphur and phosphorus are used to make carbon steel nuts. These nuts can reach yield strengths of 250–550 MPa and tensile strengths of 400–850 MPa, depending on the grade and heat treatment. They have outstanding load-bearing capacity, wear resistance, and hardness. While surface coatings like zinc plating or black oxide enhance corrosion resistance and prolong product lifespan in challenging environments, heat-treated variants offer greater mechanical strength.
Specification : ASTM F568 / ASME SF568
Dimension : DIN, ISO, ASTM, JIS, BS, GB, IS and all International Standards
Size Range : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Length : 3 mm to 200 mm
Type : Hex Head nuts, Square nuts, Lock nuts, Eye nuts, wing nuts, T nuts, Panel Nuts, Coupling Nuts, Dome nuts, Acorn Nuts.
| Grade | C | P | S | B |
| Carbon Steel 10.9 | 0.20-0.55 | 0.025 | 0.025 | 0.003 |
| Carbon Steel 12.9 | 0.28-0.5 | 0.025 | 0.025 | 0.003 |
| Element | Nominal thread diameter size range [mm] | Proof strength [MPa] | Yield strength (min) [MPa] | Tensile strength (min) [MPa] | Hardness [Rockwell] |
| Carbon Steel 10.9 | 5–100 | 830 | 940 | 1040 | C32–39 |
| Carbon Steel 12.9 | 1.6–100 | 970 | 1100 | 1220 | C39–44 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Carbon Steel Nuts have extensive application across different industries because of their cost-effectiveness and durability. They are critical in construction, automotive, oil and gas, power generation, and heavy machinery sectors. These fasteners reliably join structural components, engine parts, pipelines, and equipment subject to vibration and pressure. In civil infrastructure, they are critical in steel structures, bridges, and roads. Their high strength and resistance to wear guarantee prolonged reliability under both indoor and outdoor conditions, even under harsh environmental and mechanical conditions.
| Hex Nut NB | Across Corners | MAX Thickness | MIN Thickness | MAX Across Flats | MIN Across Flats |
|---|---|---|---|---|---|
| M 8 | 14.38 | 6.8 | 6.44 | 13 | 12.73 |
| M 10 | 17.77 | 8.4 | 8.04 | 16 | 15.73 |
| M 12 | 20.03 | 10.8 | 10.37 | 18 | 17.73 |
| M 14 | 23.35 | 12.8 | 12.1 | 21 | 20.67 |
| M 16 | 26.75 | 14.8 | 14.1 | 24 | 23.67 |
| M 18 | 29.56 | 15.8 | 15.1 | 27 | 26.16 |
| M 20 | 32.95 | 18 | 16.9 | 30 | 29.16 |
| M 22 | 37.29 | 19.4 | 18.1 | 34 | 33 |
| M 24 | 39.55 | 21.5 | 20.2 | 36 | 35 |
| M 27 | 45.2 | 23.8 | 22.5 | 41 | 40 |
| M 30 | 50.85 | 26.6 | 24.3 | 46 | 45 |
| M 33 | 55.37 | 28.7 | 27.4 | 50 | 49 |
| M 36 | 60.79 | 31 | 29.4 | 55 | 53.8 |
| M 39 | 66.44 | 33.4 | 31.8 | 60 | 58.8 |
| M 42 | 71.3 | 34 | 32.4 | 65 | 63.1 |
| M 45 | 76.95 | 36 | 34.4 | 70 | 68.1 |
| M 48 | 82.6 | 38 | 39.4 | 75 | 73.1 |
| M 52 | 88.25 | 42 | 40.4 | 80 | 78.1 |
| M 56 | 93.56 | 45 | 43.4 | 85 | 82.8 |
| M 60 | 99.21 | 48 | 46.4 | 90 | 87.8 |
| M 64 | 104.86 | 51 | 49.1 | 95 | 92.8 |
| M 68 | 110.51 | 54 | 52.1 | 100 | 97.8 |
| M 72 x 6 | 116.16 | 58 | 56.1 | 105 | 102.8 |
| M 76 x 6 | 121.81 | 61 | 59.1 | 110 | 107.8 |
| M 80 x 6 | 127.46 | 64 | 62.1 | 115 | 112.8 |
| Nominal or Basic Major Diameter of Nut Thread | Nuts Width Across Flats (F) | Width Across Corners (G) | Thickness of Hex Nuts (H) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Basic | Max | Min | Max | Min | Basic | Max | Min | ||
| 1/4 | 0.2500 | 7/16 | .438 | .428 | .505 | .488 | 7/32 | 0.226 | 0.212 |
| 5/16 | 0.3125 | 1/2 | .500 | .489 | .577 | .557 | 17/64 | 0.273 | 0.258 |
| 3/8 | 0.3750 | 9/16 | .562 | .551 | .650 | .628 | 21/64 | 0.337 | 0.320 |
| 7/16 | 0.4375 | 11/16 | .688 | .675 | .794 | .768 | 3/8 | 0.385 | 0.365 |
| 1/2 | 0.5000 | 3/4 | .750 | .736 | .866 | .840 | 7/16 | 0.448 | 0.427 |
| 9/16 | 0.5625 | 7/8 | .875 | .861 | 1.010 | .982 | 31/64 | 0.496 | 0.473 |
| 5/8 | 0.6250 | 15/16 | .938 | .922 | 1.083 | 1.051 | 35/64 | 0.559 | 0.535 |
| 3/4 | 0.7500 | 1-1/8 | 1.125 | 1.088 | 1.299 | 1.240 | 41/64 | 0.665 | 0.617 |
| 7/8 | 0.8750 | 1-5/16 | 1.312 | 1.269 | 1.516 | 1.447 | 3/4 | 0.776 | 0.724 |
| 1 | 1.0000 | 1-1/2 | 1.500 | 1.450 | 1.732 | 1.653 | 55/64 | 0.887 | 0.831 |
| 1-1/8 | 1.1250 | 1-11/16 | 1.688 | 1.631 | 1.949 | 1.859 | 31/32 | 0.999 | 0.939 |
| 1-1/4 | 1.2500 | 1-7/8 | 1.875 | 1.812 | 2.165 | 2.066 | 1-1/16 | 1.094 | 1.030 |
| 1-3/8 | 1.3750 | 2-1/16 | 2.062 | 1.994 | 2.382 | 2.273 | 1-11/64 | 1.206 | 1.138 |
| 1-1/2 | 1.5000 | 2-1/4 | 2.250 | 2.175 | 2.598 | 2.480 | 1-9/32 | 1.317 | 1.245 |
| 1-5/8 | 1.6250 | 2-7/16 | 2.438 | 2.356 | 2.815 | 2.686 | 1-25/64 | 1.429 | 1.353 |
| 1-3/4 | 1.7500 | 2-5/8 | 2.625 | 2.538 | 3.031 | 2.893 | 1-1/2 | 1.540 | 1.460 |
| 2 | 2.000 | 3 | 3.000 | 2.900 | 3.464 | 3.306 | 1-23/32 | 1.763 | 1.675 |
| 2-1/4 | 2.2500 | 3-3/8 | 3.375 | 3.263 | 3.897 | 3.719 | 1-15/16 | 1.986 | 1.890 |
| 2-1/2 | 2.5000 | 3-3/4 | 3.750 | 3.625 | 4.330 | 4.133 | 2-5/32 | 2.209 | 2.105 |
| 2-3/4 | 2.7500 | 4-1/8 | 4.125 | 3.988 | 4.763 | 4.456 | 2-3/8 | 2.431 | 2.319 |
| 3 | 3.000 | 4-1/2 | 4.500 | 4.350 | 5.196 | 4.959 | 2-19/32 | 2.654 | 2.534 |
Strong, dependable fastening is crucial in many different applications, which is where carbon steel nuts come in. They are frequently used in conjunction with bolts and studs in heavy machinery, pipelines, vehicles, and structural steel assemblies. They fasten panels, frames and beams in the building sector. They keep vital mechanical parts together in the automotive and aerospace industries. When coated or plated, these nuts are also used in manufacturing facilities, bridges, railroads, and maritime settings. They are the preferred fastening option for medium- to heavy-duty engineering tasks due to their adaptability, affordability, and mechanical strength.
Luke Steel is a leading manufacturer, supplier and exporter of high-quality Carbon Steel, Alloy Steel, Mild Steel and Galvanized Steel products. Our extensive product range includes Pipes, Tubes, Flanges, Pipe Fittings, Forged Fittings, Sheets and Plates, catering to various industries in Houstan, USA.
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