We source our 4140 round bars from reputable manufacturers, and each batch undergoes rigorous quality checks, including ultrasonic testing, hardness measurement, and dimensional inspection. This ensures that the material meets the strictest international standards and is ready for use in demanding industrial environments. Our role as a 4140 Round Bar Stockist and Exporter in Japan, Germany, and the United States is backed by a robust logistics network, allowing us to ship orders promptly and efficiently to any part of the world.
Material Specification Chart of 4140 Round Bar
Specifications | ASTM A182, ASME SA182 |
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Standards | EN, DIN, JIS, ASTM, BS, ASME, AISI |
Range of Diameter | 5mm to 500mm |
Finish | Bright, Black, Forged, Turned Bright |
Length | 1000 mm Long To 6000 mm Long |
Form | Round, Billet, Ingot, Forging Etc. |
SAE 4140/ EN19 / 42crmo4 Round Bars Grade
Country names | India | USA | German | British | Japan | China | Australia | |
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Country standards | UNS | AISI | ASTM A29 | DIN 17200 | BS 970 | JIS G4105 | GB/T 3077 | AS 1444 |
Grades | G41400 | 4140 | 4140 | 1.7225/ 42CrMo4 | EN 19 / 42CrMo4 | SCM440 | 42CrMo | 4140 |
In addition to standard sizes, we offer customized cutting, machining, and packaging services to meet specific project requirements. Our expertise in material handling and export documentation makes us a preferred partner for companies seeking a 4140 Round Bar Stockist and Exporter in the United Kingdom, South Korea, and South Africa. We ensure that every shipment is prepared with care, minimizing lead times and ensuring safe delivery.

Super Metal Manufacturing Co. has built its reputation on quality, reliability, and customer satisfaction. By partnering with us, clients gain access to premium-grade 4140 round bars backed by exceptional service and global supply capabilities. As a leading 4140 Round Bar Stockist and Exporter in the United States and beyond, we are committed to supporting industries with materials that deliver superior performance and long-term durability.
Our mission is to be more than just a supplier – we aim to be a trusted solutions provider for all your alloy steel requirements. Whether your needs are in construction, manufacturing, or specialized engineering applications, our extensive stock of 4140 round bars ensures you always get the right product at the right time, anywhere in the world.
Alloy Steel 4140 Round Bars Dimensions Standard
Diameter or Width (mm) |
Weight per meter | Sectional Area | Perimeter |
Round (kg) |
Round (cm²) |
Round (cm) |
|
5.0 | 0.15 | 0.20 | 1.57 |
5.5 | 0.19 | 0.24 | 1.78 |
6.0 | 0.22 | 0.28 | 1.88 |
7.0 | 0.30 | 0.38 | 2.20 |
8.0 | 0.39 | 0.50 | 2.51 |
9.0 | 0.50 | 0.64 | 2.83 |
10 | 0.63 | 0.79 | 3.14 |
11 | 0.75 | 0.95 | 3.46 |
12 | 0.89 | 1.13 | 3.77 |
14 | 1.21 | 1.54 | 4.40 |
16 | 1.58 | 2.01 | 5.03 |
18 | 2.00 | 2.54 | 5.65 |
20 | 2.47 | 3.14 | 6.28 |
22 | 2.98 | 3.80 | 6.91 |
25 | 3.85 | 4.91 | 7.85 |
28 | 4.83 | 6.16 | 8.80 |
32 | 6.31 | 8.04 | 10.05 |
36 | 7.99 | 10.18 | 11.31 |
40 | 9.86 | 12.57 | 12.57 |
45 | 12.49 | 15.90 | 14.14 |
50 | 15.41 | 19.64 | 15.71 |
56 | 19.34 | 24.63 | 17.59 |
63 | 24.47 | 31.17 | 19.79 |
71 | 31.08 | 39.59 | 22.31 |
80 | 39.46 | 50.27 | 25.13 |
Application of AISI Alloy Steel 4140 Round Bars
ASTM alloy 4140 steel bar, flat or plate material can be used for as wide variety of applications where greater toughness and wear resistance is needed over lower carbon grades. Typical applications for 4140 tool steel uses include Components, Adapters, Arbors,strippers, holder blocks, mold bases, ejectors, back up and support tooling, fixtures, jigs, molds, cams, drill collars, Axle Shafts, Bolts, Crankshafts,stubs, couplings, reamer bodies, axles, shafting, piston rods, rams, hydraulic machinery shafts, gears, sprockets, gear racks, chain links, spindles, tool bodies, tool holders, tie rods, Connection Rods, Chuck Bodies, Collets, Conveyor Pins & Rolls, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts,Lathe Spindles, Logging Parts, Milling Spindles, Motor Shafts, Nuts, Pinch Bars, Pinions, Pump Shafts,boring bars,tracks, slides, wear strips or parts, forming dies, brake dies, trim dies, bolsters, machinery parts and components, etc.