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Round Bars

Round Bars





Material : Alloy Steel F5 A182 Round Bars, Flat Bar, Square Bar, Hex Bar, Rod Suppliers / Manufacturers / Stockist / Suppliers in India

Steel Round Bar type ASTM A182 F5 Alloy Steel Round Bars, Flat Bar, Square Bar, Hex Bar, Rod
Die Steel Bar
Material Standards

ASTM A689, JIS G4801, DIN 17221, GB/T 18254, ASTM A295, JIS G4805, etc.

Spring steel Material 65Mn, 1566, 60Si2Mn, 9260, etc.
Bearing steel Material GCr15, SAE52100, GCr15SiMn, 100CrMnSi6-4, SJU2, etc.
Cold heading steel Material ML25, ML35, etc.
Alloy structural steel Material

40CrNiMo, SAE4330, 42CrMo, 15Cr2Ni2, 40CrNi2Mo, 35CrMoV,
12Cr1MoV, ASTM4130, SCM420, 40CrV, etc.

Military steel Material

20Cr2Ni4A, 18Cr2Ni4WA, 23CrNiMo7-4-7, etc.

Available Material Grade

42CrMo4/SCM440/AISI 4140/DIN 1.7225, 4130 / 1.7218, 4140 / 1.7225, 4340 / 1.6582, 5140 / 1.7035, 8620 / 1.6523, EN19 / EN24
H13 alloy steel round bar, 42 Crmo4 Alloy Steel Round Bar, AISI 4140 alloy steel round bar , 42CrMo4 alloy steel rods

  • A182 Grade F1 Class 1 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F9 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F9 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F11 Class 2 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F12 Class 2 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F22 Class 3 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F91 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A350 LF3 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
ASTM A182 F5 Alloy Steel Round Bars Range

Range – 3.17mm to 350mm dia

ASTM A182 F5 Alloy Steel Round Bars Diameter 5mm-500mm (Customized size is acceptable)
ASTM A182 F5 Alloy Steel Round Bars Length 1m-9m or according to the customer’s requirement.
ASTM A182 F5 Alloy Steel Round Bars Type Round bar, rod, square bar, flat bar, hexagon bar, angle bar, channel bar, threaded bar
ASTM A182 F5 Alloy Steel Round Bars Technique Forged/Hot Rolled/Cold Drawn/Peeled
ASTM A182 F5 Alloy Steel Round Bars Surface bright round bar, pickled round bar, black round bar
Other processing service Hot dipped Galvanized, pre-galvanized, Color painting,coated, cutting, bending,punching
Package Details Standard seaworthy package(wooden boxes package, pvc package, or other package)
Export Area USA, UAE, Europe, Asia, Middle East, Africa, South America

Material : Alloy Steel F9 A182 Round Bars, Flat Bar, Square Bar, Hex Bar, Rod Suppliers / Manufacturers / Stockist / Suppliers in India

Steel Round Bar type ASTM A182 F9 Alloy Steel Round Bars, Flat Bar, Square Bar, Hex Bar, Rod
Die Steel Bar
Material Standards

ASTM A689, JIS G4801, DIN 17221, GB/T 18254, ASTM A295, JIS G4805, etc.

Spring steel Material 65Mn, 1566, 60Si2Mn, 9260, etc.
Bearing steel Material GCr15, SAE52100, GCr15SiMn, 100CrMnSi6-4, SJU2, etc.
Cold heading steel Material ML25, ML35, etc.
Alloy structural steel Material

40CrNiMo, SAE4330, 42CrMo, 15Cr2Ni2, 40CrNi2Mo, 35CrMoV,
12Cr1MoV, ASTM4130, SCM420, 40CrV, etc.

Military steel Material

20Cr2Ni4A, 18Cr2Ni4WA, 23CrNiMo7-4-7, etc.

Available Material Grade

42CrMo4/SCM440/AISI 4140/DIN 1.7225, 4130 / 1.7218, 4140 / 1.7225, 4340 / 1.6582, 5140 / 1.7035, 8620 / 1.6523, EN19 / EN24
H13 alloy steel round bar, 42 Crmo4 Alloy Steel Round Bar, AISI 4140 alloy steel round bar , 42CrMo4 alloy steel rods

  • A182 Grade F1 Class 1 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F9 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F9 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F11 Class 2 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F12 Class 2 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F22 Class 3 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F91 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A350 LF3 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
ASTM A182 F9 Alloy Steel Round Bars Range

Range – 3.17mm to 350mm dia

ASTM A182 F9 Alloy Steel Round Bars Diameter 5mm-500mm (Customized size is acceptable)
ASTM A182 F9 Alloy Steel Round Bars Length 1m-9m or according to the customer’s requirement.
ASTM A182 F9 Alloy Steel Round Bars Type Round bar, rod, square bar, flat bar, hexagon bar, angle bar, channel bar, threaded bar
ASTM A182 F9 Alloy Steel Round Bars Technique Forged/Hot Rolled/Cold Drawn/Peeled
ASTM A182 F9 Alloy Steel Round Bars Surface bright round bar, pickled round bar, black round bar
Other processing service Hot dipped Galvanized, pre-galvanized, Color painting,coated, cutting, bending,punching
Package Details Standard seaworthy package(wooden boxes package, pvc package, or other package)
Export Area USA, UAE, Europe, Asia, Middle East, Africa, South America

Material : Alloy Steel F11 A182 Round Bars, Flat Bar, Square Bar, Hex Bar, Rod Suppliers / Manufacturers / Stockist / Suppliers in India

Steel Round Bar type ASTM A182 F11 Alloy Steel Round Bars, Flat Bar, Square Bar, Hex Bar, Rod
Die Steel Bar
Material Standards

ASTM A689, JIS G4801, DIN 17221, GB/T 18254, ASTM A295, JIS G4805, etc.

Spring steel Material 65Mn, 1566, 60Si2Mn, 9260, etc.
Bearing steel Material GCr15, SAE52100, GCr15SiMn, 100CrMnSi6-4, SJU2, etc.
Cold heading steel Material ML25, ML35, etc.
Alloy structural steel Material

40CrNiMo, SAE4330, 42CrMo, 15Cr2Ni2, 40CrNi2Mo, 35CrMoV,
12Cr1MoV, ASTM4130, SCM420, 40CrV, etc.

Military steel Material

20Cr2Ni4A, 18Cr2Ni4WA, 23CrNiMo7-4-7, etc.

Available Material Grade

42CrMo4/SCM440/AISI 4140/DIN 1.7225, 4130 / 1.7218, 4140 / 1.7225, 4340 / 1.6582, 5140 / 1.7035, 8620 / 1.6523, EN19 / EN24
H13 alloy steel round bar, 42 Crmo4 Alloy Steel Round Bar, AISI 4140 alloy steel round bar , 42CrMo4 alloy steel rods

  • A182 Grade F1 Class 1 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F9 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F9 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F11 Class 2 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F12 Class 2 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F22 Class 3 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F91 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A350 LF3 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
ASTM A182 F11 Alloy Steel Round Bars Range

Range – 3.17mm to 350mm dia

ASTM A182 F11 Alloy Steel Round Bars Diameter 5mm-500mm (Customized size is acceptable)
ASTM A182 F11 Alloy Steel Round Bars Length 1m-9m or according to the customer’s requirement.
ASTM A182 F11 Alloy Steel Round Bars Type Round bar, rod, square bar, flat bar, hexagon bar, angle bar, channel bar, threaded bar
ASTM A182 F11 Alloy Steel Round Bars Technique Forged/Hot Rolled/Cold Drawn/Peeled
ASTM A182 F11 Alloy Steel Round Bars Surface bright round bar, pickled round bar, black round bar
Other processing service Hot dipped Galvanized, pre-galvanized, Color painting,coated, cutting, bending,punching
Package Details Standard seaworthy package(wooden boxes package, pvc package, or other package)
Export Area USA, UAE, Europe, Asia, Middle East, Africa, South America

Material : Alloy Steel F12 A182 Round Bars, Flat Bar, Square Bar, Hex Bar, Rod Suppliers / Manufacturers / Stockist / Suppliers in India

Steel Round Bar type ASTM A182 F12 Alloy Steel Round Bars, Flat Bar, Square Bar, Hex Bar, Rod
Die Steel Bar
Material Standards

ASTM A689, JIS G4801, DIN 17221, GB/T 18254, ASTM A295, JIS G4805, etc.

Spring steel Material 65Mn, 1566, 60Si2Mn, 9260, etc.
Bearing steel Material GCr15, SAE52100, GCr15SiMn, 100CrMnSi6-4, SJU2, etc.
Cold heading steel Material ML25, ML35, etc.
Alloy structural steel Material

40CrNiMo, SAE4330, 42CrMo, 15Cr2Ni2, 40CrNi2Mo, 35CrMoV,
12Cr1MoV, ASTM4130, SCM420, 40CrV, etc.

Military steel Material

20Cr2Ni4A, 18Cr2Ni4WA, 23CrNiMo7-4-7, etc.

Available Material Grade

42CrMo4/SCM440/AISI 4140/DIN 1.7225, 4130 / 1.7218, 4140 / 1.7225, 4340 / 1.6582, 5140 / 1.7035, 8620 / 1.6523, EN19 / EN24
H13 alloy steel round bar, 42 Crmo4 Alloy Steel Round Bar, AISI 4140 alloy steel round bar , 42CrMo4 alloy steel rods

  • A182 Grade F1 Class 1 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F9 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F9 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F11 Class 2 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F12 Class 2 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F22 Class 3 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F91 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A350 LF3 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
ASTM A182 F12 Alloy Steel Round Bars Range

Range – 3.17mm to 350mm dia

ASTM A182 F12 Alloy Steel Round Bars Diameter 5mm-500mm (Customized size is acceptable)
ASTM A182 F12 Alloy Steel Round Bars Length 1m-9m or according to the customer’s requirement.
ASTM A182 F12 Alloy Steel Round Bars Type> Round bar, rod, square bar, flat bar, hexagon bar, angle bar, channel bar, threaded bar
ASTM A182 F12 Alloy Steel Round Bars Technique Forged/Hot Rolled/Cold Drawn/Peeled
ASTM A182 F12 Alloy Steel Round Bars Surface bright round bar, pickled round bar, black round bar
Other processing service Hot dipped Galvanized, pre-galvanized, Color painting,coated, cutting, bending,punching
Package Details Standard seaworthy package(wooden boxes package, pvc package, or other package)
Export Area USA, UAE, Europe, Asia, Middle East, Africa, South America

Alloy Steel F91 A182 Round Bars, Flat Bar, Square Bar, Hex Bar, Rod Suppliers / Manufacturers / Stockist / Suppliers in India

Steel Round Bar type ASTM A182 F91 Alloy Steel Round Bars, Flat Bar, Square Bar, Hex Bar, Rod
Die Steel Bar
Material Standards

ASTM A689, JIS G4801, DIN 17221, GB/T 18254, ASTM A295, JIS G4805, etc.

Spring steel Material 65Mn, 1566, 60Si2Mn, 9260, etc.
Bearing steel Material GCr15, SAE52100, GCr15SiMn, 100CrMnSi6-4, SJU2, etc.
Cold heading steel Material ML25, ML35, etc.
Alloy structural steel Material

40CrNiMo, SAE4330, 42CrMo, 15Cr2Ni2, 40CrNi2Mo, 35CrMoV,
12Cr1MoV, ASTM4130, SCM420, 40CrV, etc.

Military steel Material

20Cr2Ni4A, 18Cr2Ni4WA, 23CrNiMo7-4-7, etc.

Available Material Grade

42CrMo4/SCM440/AISI 4140/DIN 1.7225, 4130 / 1.7218, 4140 / 1.7225, 4340 / 1.6582, 5140 / 1.7035, 8620 / 1.6523, EN19 / EN24
H13 alloy steel round bar, 42 Crmo4 Alloy Steel Round Bar, AISI 4140 alloy steel round bar , 42CrMo4 alloy steel rods

  • A182 Grade F1 Class 1 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F9 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F9 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F11 Class 2 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F12 Class 2 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F22 Class 3 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A182 Grade F91 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
  • A350 LF3 Round Bar, Flat Bar, Square Bar, Hex Bar, Rod
ASTM A182 F91 Alloy Steel Round Bars Range

Range – 3.17mm to 350mm dia

ASTM A182 F91 Alloy Steel Round Bars Diameter 5mm-500mm (Customized size is acceptable)
ASTM A182 F91 Alloy Steel Round Bars Length 1m-9m or according to the customer’s requirement.
ASTM A182 F91 Alloy Steel Round Bars Type Round bar, rod, square bar, flat bar, hexagon bar, angle bar, channel bar, threaded bar
ASTM A182 F91 Alloy Steel Round Bars Technique Forged/Hot Rolled/Cold Drawn/Peeled
ASTM A182 F91 Alloy Steel Round Bars Surface bright round bar, pickled round bar, black round bar
Other processing service Hot dipped Galvanized, pre-galvanized, Color painting,coated, cutting, bending,punching
Package Details Standard seaworthy package(wooden boxes package, pvc package, or other package)
Export Area USA, UAE, Europe, Asia, Middle East, Africa, South America


Alloy Steel A182 Weights Per Linear Foot

SIZE IN INCHES ROUND SQUARE OCTAGON HEXAGON SIZE IN INCHES ROUND SQUARE OCTAGON HEXAGON
1/16 .010 .013 .011 .012 11/16 1.262 1.607 1.333 1.392
5/64 .017 .022 .018 .019 45/64 1.320 1.681 1.394 1.456
3/32 .023 .029 .024 .025 23/32 1.380 1.756 1.487 1.521
7/64 .031 .039 .033 .034 47/64 1.440 1.834 1.521 1.588
1/8 .042 .053 .044 .046 3/4 1.502 1.913 1.586 1.656
9/64 .053 .067 .056 .058 25/32 1.630 2.075 1.721 1.797
5/32 .065 .083 .069 .072 13/16 1.763 2.245 1.862 1.944
11/64 .079 .100 .083 .087 27/32 1.901 2.421 2.008 2.096
3/16 .094 .120 .099 .104 7/8 2.045 2.603 2.159 2.254
13/64 .110 .140 .116 .121 29/32 2.193 2.792 2.316 2.418
7/32 .128 .163 .135 .141 15/16 2.347 2.988 2.479 2.588
15/64 .147 .187 .155 .162 31/32 2.506 3.191 2.646 2.763
1/4 .167 .213 .176 .184 1 2.670 3.400 2.820 2.945
17/64 .188 .240 .199 .207 1-1/16 3.015 3.838 3.183 3.324
9/32 .211 .269 .223 .233 1-1/8 3.380 4.303 3.569 3.727
19/64 .235 .300 .248 .259 1-3/16 3.766 4.795 3.977 4.152
5/16 .261 .332 .275 .288 1-1/4 4.172 5.313 4.407 4.601
21/64 .288 .360 .304 .318 1-5/16 4.600 5.857 4.858 5.072
11/32 .316 .402 .334 .348 1-3/8 5.049 6.428 5.332 5.567
23/64 .345 .439 .364 .381 1-7/16 5.518 7.026 5.827 6.085
3/8 .376 .478 .397 .414 1-1/2 6.008 7.650 6.345 6.625
25/64 .408 .519 .431 .450 1-9/16 6.519 8.301 6.885 7.189
13/32 .441 .561 .466 .486 1-5/8 7.051 8.978 7.446 7.775
27/64 .475 .605 .502 .524 1-11/16 7.604 9.682 8.030 8.385
7/16 .511 .651 .540 .564 1-3/4 8.178 10.41 8.634 9.018
29/64 .548 .698 .579 .604 1-13/16 8.773 11.17 9.265 9.673
15/32 .587 .747 .620 .647 1-7/8 9.388 11.95 9.911 10.35
31/64 .627 .798 .662 .692 1-15/16 10.02 12.76 10.58 11.05
1/2 .668 .850 .705 .736 2 10.68 13.60 11.28 11.78
33/64 .710 .904 .750 .783 2-1/16 11.36 14.46 11.99 12.53
17/32 .754 .960 .796 .831 2-1/8 12.06 15.35 12.73 13.30
35/64 .799 1.017 .844 .881 2-3/16 12.78 16.27 13.49 14.09
9/16 .845 1.076 .892 .932 2-1/4 13.52 17.21 14.27 14.91
37/64 .893 1.136 .943 .985 2-5/16 14.28 18.18 15.08 15.75
19/32 .941 1.199 .994 1.038 2-3/8 15.06 19.18 15.91 16.61
39/64 .992 1.263 1.048 1.094 2-7/16 15.87 20.20 16.75 17.49
5/8 1.043 1.328 1.102 1.150 2-1/2 16.69 21.25 17.62 18.40
41/64 1.096 1.395 1.207 1.209 2-9/16 17.53 22.33 18.52 19.34
21/32 1.150 1.464 1.214 1.268 2-5/8 18.40 23.43 19.43 20.29
43/64 1.205 1.535 1.272 1.329 2-11/16 19.29 24.56 20.37 21.27

SIZE IN INCHES ROUND SQUARE OCTAGON HEXAGON SIZE IN INCHES ROUND SQUARE OCTAGON
2-3/4 20.19 25.71 21.33 22.27 6 96.13 122.4 101.5
2-3/16 21.12 26.90 22.31 23.29 6-1/16 98.15 125.0 103.6
2-7/8 22.07 28.10 23.31 24.34 6-1/8 100.2 127.6 105.8
2-5/16 23.04 29.34 24.33 25.41 6-3/16 102.2 130.2 108.0
3 24.03 30.60 25.38 26.50 6-1/4 104.3 132.8 110.2
3-1/16 25.05 31.89 26.45 27.62 6-5/16 106.4 135.5 112.4
3-1/8 26.08 33.20 27.54 28.76 6-3/8 108.5 138.2 114.6
3-3/16 27.13 34.55 28.65 29.92 6-7/16 110.7 140.9 116.9
3-1/4 28.21 35.91 29.79 6-1/2 112.8 143.7 119.1
3-5/16 29.30 37.21 30.94 6-9/16 115.0 146.4 121.4
3-3/8 30.42 38.73 32.12 6-5/8 117.2 149.2 123.8
3-7/16 31.55 40.18 33.32 6-11/16 119.4 152.1 126.1
3-1/2 32.71 41.6 34.54 6-3/4 121.7 154.9 128.5
3-9/16 33.90 43.15 35.79 6-13/16 123.9 157.8 130.9
3-5/8 35.09 44.68 37.07 6-7/8 126.2 160.7 133.3
3-1/16 36.31 46.23 38.34 6-15/16 128.5 163.6 135.7
3-3/4 37.55 47.81 39.65 7 130.9 166.6 138.2
3-3/16 38.81 49.42 40.99 7-1/16 133.2 169.6 140.7
3-7/8 40.10 51.05 42.34 7-1/8 135.6 172.6 143.2
3-5/16 41.40 52.71 43.72 7-3/16 138.0 175.6 145.7
4 42.73 54.40 45.12 7-1/4 140.4 178.7 148.2
4-1/16 44.07 56.11 46.54 7-5/16 142.8 181.8 150.8
4-1/8 45.44 57.85 47.98 7-3/8 145.2 184.9 153.4
4-3/16 46.83 59.62 49.45 7-7/16 147.7 188.1 156.0
4-1/4 48.23 61.41 50.93 7-1/2 150.2 191.3 158.6
4-5/16 49.66 63.23 52.44 7-5/8 155.3 197.7 164.0
4-3/8 51.11 65.08 53.98 7-3/4 160.4 204.2 169.4
4-7/16 52.58 66.95 55.53 7-7/8 165.6 210.9 174.9
4-1/2 54.08 68.85 57.10 8 170.9 217.6 180.5
4-9/16 55.59 70.78 58.70 8-1/4 181.8 230.9 192.0
4-5/8 57.12 72.73 60.32 8-1/2 192.9 245.7 203.8
4-1/16 58.68 74.71 61.96 8-3/4 204.4 259.6 215.8
4-3/4 60.25 76.71 63.63 9 216.3 275.4 228.4
4-3/16 61.85 78.75 65.32 10 267.0 340.0 282.0
4-7/8 63.46 80.80 67.02 11 323.1 411.4 341.2
4-5/16 65.10 82.89 68.75 12 384.4 489.6 406.1
5 66.76 85.00 70.50 13 451 575 476
5-1/16 68.44 87.14 72.27 14 523 666 552
5-1/8 70.14 89.30 74.07 15 601 765 634
5-3/16 71.86 91.50 75.89 16 684 871 721
5-1/4 73.60 93.71 77.72 17 772 982 814
5-5/16 75.36 95.96 79.59 18 865 1102 912
5-3/8 77.15 98.23 81.47 19 964 1227 1017
5-7/16 78.95 100.5 83.38 20 1068 1360 1127
5-1/2 80.78 102.9 85.30 21 1177 1499 1242
5-9/16 82.62 105.2 87.25 22 1292 1645 1363
5-5/8 84.49 107.6 89.23 23 1412 1798 1490
5-1/16 86.38 110.0 91.22 24 1538 1958 1622
5-3/4 88.29 112.4 9323 25 1669 2125 1760
5-3/16 90.22 114.9 95.27 26 1805 2298 1904
5-7/8 92.17 117.4 97.33 27 1946 2478 2053
5-5/16 94.14 119.9 99.41 28 2093 2665 2208

Alloy Steel F5 A182 Round Bar Weight Chart

Alloy Steel Round Bar Grade Datasheets

Grade Description and Typical Application
Alloy Steel 4140
Datasheet
General purpose high tensile Cr-Mo low alloy steel, widely used for axles, shafts, studs and bolts, gears and drill rods.  The steel is usually supplied pre-hardened, but can be flame or induction surface hardened or nitrided.
Alloy Steel 4340
Datasheet
General purpose high tensile Ni-Cr-Mo low alloy steel with higher strength and able to be hardended through larger sections compared to 4140.  Used in highly stressed shafts in larger sizes, heavy truck and tractor axles and transmission shafts.  Supplied pre-hardened but with further re-hardening or surface hardening possible.
En25 Alloy Steel

En25 is used extensively in most industry sectors for applications requiring higher tensile and yield strength than 4140 can provide, similiar to En26 but with lower carbon content.

En26 Alloy Steel Characterised by high strength and toughness in very large sections, similar to En25 but with a higher carbon content. En26 is used extensively in most industry sectors for applications requiring higher tensile strength and yield strength than 4140, 4340 or En25 can provide.
Case Hardening
Alloy Steel 8620
Datasheet

General-purpose case hardening steel suitable for comparatively lightly stressed components. Used for automatic components such as transmission gears, crown wheels, ring gears, hypoid gears and racers, king pins and pinions.

17CrNiMo6
Datasheet

The high chromium content produces high case hardness with excellent core strength. Used for gears, bearings, sleeves, pins, bushes, shafts, plastic moulds and any highly stressed or high wear component.

En36A Alloy Steel Used extensively for highly stressed gears in trucks, agriculture and mining machinery, pins and brushes, heavily loaded shafts and other applications requiring a hard surface with a tough shock-resisting core. Core tensile 55tsi minimum after hardening and tempering.
En39B Alloy Steel An exceptionally high hardenability steel for large or highly stressed gears where core strength and toughness is required. May be used as an alloy engineering steel.Core tensile strength 85tsi minimum after hardening and strengthening.