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4140 Steel Tube

Siddhigiri Tubes

4140 Steel Tube

Siddhigiri Tubes is a distinguished name in the metal tubing industry, known for delivering top-quality products and precision engineering. As a leading supplier, we specialize in providing high-grade 4140 Steel Tubing, catering to diverse industries worldwide.

4140 Steel Tubing is a specialized alloy steel, widely recognized for its exceptional strength, durability, and versatility. Manufactured from premium-grade raw materials, our tubing is engineered to meet the rigorous demands of various industries. Renowned for its outstanding resistance to wear, corrosion, and fatigue, 4140 Steel Tubing finds extensive application in aerospace, automotive, and other critical sectors.

Key Features:

Exceptional Strength and Durability: 4140 Steel Tubing is celebrated for its impressive tensile strength, making it an ideal choice for applications where robust materials are essential.

Weldability and Formability: This alloy steel tubing is easily weldable and formable, allowing for precise fabrication and customization to meet specific project requirements.

Diverse Range of Sizes: We offer 4140 Steel Tubing in various sizes, providing versatility for a broad spectrum of applications.

Compliance and Certification: All our products, including 4140 Steel Tubing, meet international standards and undergo rigorous quality control processes. We provide material certificates upon request, demonstrating compliance with industry specifications.

4140 Steel Tubing Size in Stock

4140 Steel Tubing Size in Stock
OD X THICK
1/4” OD x 0.035” ( 6.35 MM OD X 0.9 MM )
1/4” OD x 0.04” ( 6.35 MM OD X 1 MM )
1/4” OD x 0.05” ( 6.35 MM OD X 1.25 MM )
1/4” OD x 0.06” ( 6.35 MM OD X 1.5 MM )
1/4” OD x 0.08” ( 6.35 MM OD X 2 MM )
8 MM OD X 0.9 MM
8 MM OD X 1 MM
8 MM OD X 1.25 MM
8 MM OD X 1.5 MM
8 MM OD X 2 MM
3/8” OD x 0.035” ( 9.5 MM OD X 0.9 MM )
3/8” OD x 0.04” ( 9.5 MM OD X 1 MM )
3/8” OD x 0.05” ( 9.5 MM OD X 1.25 MM )
3/8” OD x 0.06” ( 9.5 MM OD X 1.5 MM )
3/8” OD x 0.08” ( 9.5 MM OD X 2 MM )
10 MM OD X 0.9 MM
10 MM OD X 1 MM
10 MM OD X 1.25 MM
10 MM OD X 1.5 MM
10 MM OD X 2 MM
1/2” OD x 0.035” ( 12.7 MM OD X 0.9 MM )
1/2” OD x 0.04” ( 12.7 MM OD X 1 MM )
1/2” OD x 0.05” ( 12.7 MM OD X 1.25 MM )
1/2” OD x 0.06” ( 12.7 MM OD X 1.5 MM )
1/2” OD x 0.08” ( 12.7 MM OD X 2 MM )
5/8” OD x 0.035” ( 15.88 MM OD X 0.9 MM )
5/8” OD x 0.04” ( 15.88 MM OD X 1 MM )
5/8” OD x 0.05” ( 15.88 MM OD X 1.25 MM )
5/8” OD x 0.06” ( 15.88 MM OD X 1.5 MM )
5/8” OD x 0.08” ( 15.88 MM OD X 2 MM )
16 MM OD X 0.9 MM
16 MM OD X 1 MM
16 MM OD X 1.25 MM
16 MM OD X 1.5 MM
16 MM OD X 2 MM
18 MM OD X 0.9 MM
18 MM OD X 1 MM
18 MM OD X 1.25 MM
18 MM OD X 1.5 MM
18 MM OD X 2 MM
3/4” OD x 0.035” ( 19.05 MM OD X 0.9 MM )
3/4” OD x 0.04” ( 19.05 MM OD X 1 MM )
3/4” OD x 0.05” ( 19.05 MM OD X 1.25 MM )
3/4” OD x 0.06” ( 19.05 MM OD X 1.5 MM )
3/4” OD x 0.08” ( 19.05 MM OD X 2 MM )
7/8” OD x 0.035” ( 22.2 MM OD X 0.9 MM )
7/8” OD x 0.04” ( 22.2 MM OD X 1 MM )
7/8” OD x 0.05” ( 22.2 MM OD X 1.25 MM )
7/8” OD x 0.06” ( 22.2 MM OD X 1.5 MM )
7/8” OD x 0.08” ( 22.2 MM OD X 2 MM )
1” OD x 0.035” ( 25.4 MM OD X 0.9 MM )
1” OD x 0.04” ( 25.4 MM OD X 1 MM )
1” OD x 0.05” ( 25.4 MM OD X 1.25 MM )
1” OD x 0.06” ( 25.4 MM OD X 1.5 MM )
1” OD x 0.08” ( 25.4 MM OD X 2 MM )
1” OD x 0.095” ( 25.4 MM OD X 2.5 MM )
1” OD x 0.12” ( 25.4 MM OD X 3 MM )
1.1” OD x 0.035” ( 28.2 MM OD X 0.9 MM )
1.1” OD x 0.04” ( 28.2 MM OD X 1 MM )
1.1” OD x 0.05” ( 28.2 MM OD X 1.25 MM )
1.1” OD x 0.06” ( 28.2 MM OD X 1.5 MM )
1.1” OD x 0.08” ( 28.2 MM OD X 2 MM )
1.1” OD x 0.095” ( 28.2 MM OD X 2.5 MM )
1.1” OD x 0.12” ( 28.2 MM OD X 3 MM )
1.15” OD x 0.035” ( 29.2 MM OD X 0.9 MM )
1.15” OD x 0.04” ( 29.2 MM OD X 1 MM )
1.15” OD x 0.05” ( 29.2 MM OD X 1.25 MM )
1.15” OD x 0.06” ( 29.2 MM OD X 1.5 MM )
1.15” OD x 0.08” ( 29.2 MM OD X 2 MM )
1.15” OD x 0.095” ( 29.2 MM OD X 2.5 MM )
1.15” OD x 0.12” ( 29.2 MM OD X 3 MM )
1.25” OD x 0.035” ( 31.75 MM OD X 0.9 MM )
1.25” OD x 0.04” ( 31.75 MM OD X 1 MM )
1.25” OD x 0.05” ( 31.75 MM OD X 1.25 MM )
1.25” OD x 0.06” ( 31.75 MM OD X 1.5 MM )
1.25” OD x 0.08” ( 31.75 MM OD X 2 MM )
1.25” OD x 0.095” ( 31.75 MM OD X 2.5 MM )
1.25” OD x 0.12” ( 31.75 MM OD X 3 MM )
1.5” OD x 0.035” ( 38.1 MM OD X 0.9 MM )
1.5” OD x 0.04” ( 38.1 MM OD X 1 MM )
1.5” OD x 0.05” ( 38.1 MM OD X 1.25 MM )
1.5” OD x 0.06” ( 38.1 MM OD X 1.5 MM )
1.5” OD x 0.08” ( 38.1 MM OD X 2 MM )
1.5” OD x 0.095” ( 38.1 MM OD X 2.5 MM )
1.5” OD x 0.12” ( 38.1 MM OD X 3 MM )
1.75” OD x 0.035” ( 44.5 MM OD X 0.9 MM )
1.75” OD x 0.04” ( 44.5 MM OD X 1 MM )
1.75” OD x 0.05” ( 44.5 MM OD X 1.25 MM )
1.75” OD x 0.06” ( 44.5 MM OD X 1.5 MM )
1.75” OD x 0.08” ( 44.5 MM OD X 2 MM )
1.75” OD x 0.095” ( 44.5 MM OD X 2.5 MM )
1.750” OD x 0.12” ( 44.5 MM OD X 3 MM )
2” OD x 0.035” ( 50.8 MM OD X 0.9 MM )
2” OD x 0.04” ( 50.8 MM OD X 1 MM )
2” OD x 0.05” ( 50.8 MM OD X 1.25 MM )
2” OD x 0.06” ( 50.8 MM OD X 1.5 MM )
2” OD x 0.08” ( 50.8 MM OD X 2 MM )
2” OD x 0.095” ( 50.8 MM OD X 2.5 MM )
2” OD x 0.12” ( 50.8 MM OD X 3 MM )

4140 Steel Tubing Pressure Ratings

OD inches Ave. Wall inches Min Yield Strength (PSI) Min Tensile Strength (PSI) Theoretical Burst Pressure * (PSI) Working Pressure (PSI) 25% of Burst Theoretical Yield Point ** (PSI) Collapse Pressure *** (PSI)
0.250 0.020 30,000 75,000 14,286 3,571 5,714 4,416
0.250 0.028 30,000 75,000 21,649 5,412 8,660 5,967
0.250 0.035 30,000 75,000 29,167 7,292 11,667 7,224
0.250 0.049 30,000 75,000 48,355 12,089 19,342 9,455
0.250 0.065 30,000 75,000 81,250 20,313 32,500 11,544
0.375 0.020 30,000 75,000 8,955 2,239 3,582 3,029
0.375 0.028 30,000 75,000 13,166 3,292 5,266 4,145
0.375 0.035 30,000 75,000 17,213 4,303 6,885 5,077
0.375 0.049 30,000 75,000 26,534 6,634 10,614 6,816
0.375 0.065 30,000 75,000 39,796 9,949 15,918 8,597
0.500 0.020 30,000 75,000 6,522 1,630 2,609 2,201
0.500 0.028 30,000 75,000 9,459 2,365 3,784 3,172
0.500 0.035 30,000 75,000 12,209 3,052 4,884 3,906
0.500 0.049 30,000 75,000 18,284 4,571 7,313 5,201
0.500 0.065 30,000 75,000 26,351 6,588 10,541 6,786
0.500 0.083 30,000 75,000 37,275 9,319 14,910 8,307
0.625 0.020 30,000 75,000 5,128 1,282 2,051 1,859
0.625 0.028 30,000 75,000 7,381 1,845 2,953 2,568
0.625 0.035 30,000 75,000 9,459 2,365 3,784 3,172
0.625 0.049 30,000 75,000 13,947 3,487 5,579 4,335
0.625 0.065 30,000 75,000 19,697 4,924 7,879 5,591
0.625 0.083 30,000 75,000 27,124 6,781 10,850 6,910
0.625 0.095 30,000 75,000 32,759 8,190 13,103 7,734
0.625 0.109 30,000 75,000 40,172 10,043 16,069 8,639
0.750 0.028 30,000 75,000 6,052 1,513 2,421 2,156
0.750 0.035 30,000 75,000 7,721 1,930 3,088 2,669
0.750 0.049 30,000 75,000 11,273 2,818 4,509 3,664
0.750 0.065 30,000 75,000 15,726 3,931 6,290 4,749
0.750 0.083 30,000 75,000 21,318 5,330 8,527 5,905
0.750 0.095 30,000 75,000 25,446 6,362 10,179 6,637
0.750 0.109 30,000 75,000 30,733 7,683 12,293 7,453
0.750 0.120 30,000 75,000 35,294 8,824 14,118 8,064
0.875 0.020 30,000 75,000 3,593 898 1,437 1,340
0.875 0.028 30,000 75,000 5,128 1,282 2,051 1,859
0.875 0.035 30,000 75,000 6,522 1,630 2,609 2,201
0.875 0.049 30,000 75,000 9,459 2,365 3,784 3,172
0.875 0.065 30,000 75,000 13,087 3,272 5,235 4,126
0.875 0.083 30,000 75,000 17,560 4,390 7,024 5,152
0.875 0.095 30,000 75,000 20,803 5,201 8,321 5,807
0.875 0.109 30,000 75,000 24,886 6,221 9,954 6,543
0.875 0.120 30,000 75,000 28,346 7,087 11,339 7,100
1.000 0.028 30,000 75,000 4,449 1,112 1,780 1,633
1.000 0.035 30,000 75,000 5,645 1,411 2,258 2,027
1.000 0.049 30,000 75,000 8,149 2,037 3,259 2,796
1.000 0.065 30,000 75,000 11,207 2,802 4,483 3,647
1.000 0.083 30,000 75,000 14,928 3,732 5,971 4,567
1.000 0.095 30,000 75,000 17,593 4,398 7,037 5,159
1.000 0.109 30,000 75,000 20,908 5,227 8,363 5,827
1.000 0.120 30,000 75,000 23,684 5,921 9,474 6,336
1.000 0.134 30,000 75,000 27,459 6,865 10,984 6,963
1.250 0.035 30,000 75,000 4,449 1,112 1,780 1,633
1.250 0.049 30,000 75,000 6,380 1,595 2,552 2,260
1.250 0.065 30,000 75,000 8,705 2,176 3,482 2,958
1.250 0.083 30,000 75,000 11,485 2,871 4,594 3,719
1.250 0.095 30,000 75,000 13,443 3,361 5,377 4,213
1.250 0.109 30,000 75,000 15,843 3,961 6,337 4,776
1.250 0.120 30,000 75,000 17,822 4,455 7,129 5,207
1.250 0.134 30,000 75,000 20,468 5,117 8,187 5,742
1.500 0.035 30,000 75,000 3,671 918 1,469 1,367
1.500 0.049 30,000 75,000 5,243 1,311 2,097 1,896
1.500 0.065 30,000 75,000 7,117 1,779 2,847 2,487
1.500 0.083 30,000 75,000 9,333 2,333 3,733 3,136
1.500 0.095 30,000 75,000 10,878 2,719 4,351 3,559
1.500 0.109 30,000 75,000 12,754 3,188 5,101 4,043
1.500 0.120 30,000 75,000 14,286 3,571 5,714 4,416
1.500 0.134 30,000 75,000 16,315 4,079 6,526 4,881
1.500 0.148 30,000 75,000 18,439 4,610 7,375 5,336
1.750 0.035 30,000 75,000 3,125 781 1,250 1,176
1.750 0.049 30,000 75,000 3,864 966 1,546 1,434
1.750 0.065 30,000 75,000 6,019 1,505 2,407 2,146
1.750 0.083 30,000 75,000 7,860 1,965 3,144 2,711
1.750 0.095 30,000 75,000 9,135 2,284 3,654 3,080
1.750 0.109 30,000 75,000 10,672 2,668 4,213 3,504
1.750 0.120 30,000 75,000 11,921 2,980 4,768 3,832
1.750 0.134 30,000 75,000 13,563 3,391 5,425 4,242
1.750 0.148 30,000 75,000 15,268 3,817 6,107 4,645
1.750 0.165 30,000 75,000 17,430 4,357 6,972 5,124
2.000 0.035 30,000 75,000 2,720 680 1,088 1,032
2.000 0.049 30,000 75,000 3,864 966 1,546 1,434
2.000 0.065 30,000 75,000 5,214 1,303 2,086 1,887
2.000 0.083 30,000 75,000 6,788 1,697 2,715 2,387
2.000 0.095 30,000 75,000 7,873 1,968 3,149 2,715
2.000 0.109 30,000 75,000 9,175 2,294 3,670 3,092
2.000 0.120 30,000 75,000 10,227 2,557 4,091 3,384
2.000 0.134 30,000 75,000 11,605 2,901 4,642 3,751
2.000 0.148 30,000 75,000 13,028 3,257 5,211 4,111
2.000 0.165 30,000 75,000 14,820 3,705 5,928 4,542

4140 Steel Tubing Mechanical Properties

Properties Metric Imperial
Hardness, Vickers (converted from Brinell hardness) 207 207
Tensile strength 655 MPa 95000 psi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Yield strength 415 MPa 60200 psi
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) 13 13
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 25.70% 25.70%
Shear modulus (typical for steel) 80 GPa 11600 ksi
Hardness, Brinell 197 197
Machinability (based on AISI 1212 as 100 machinability) 65 65
Hardness, Rockwell B (converted from Brinell hardness) 92 92
Hardness, Knoop (converted from Brinell hardness) 219 219

AISI 4140 Steel Pipe Heat Treatment

Annealing 800 oC – 850 oC
Normalizing 870 oC – 900 oC
Tempering 550 oC – 700 oC

4140 Steel Tubing Chemical Compositions

Standard Grade C Mn P S Si Ni Cr Mo
ASTM A29 4140 0.38-0.43 0.75-1.00 0.035 0.040 0.15-0.35 – 0.8-1.10 0.15-0.25
EN 10250 42CrMo4/
1.7224		 0.38-0.45 0.6-0.9 0.035 0.035 0.4 – 0.9-1.2 0.15-0.30
JIS G4105 SCM440 0.38-0.43 0.60-0.85 0.03 0.03 0.15-0.35 – 0.9-1.2 0.15-0.30

4140 Steel Tubing Physical Properties

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³
Melting point 1416°C 2580°F
Siddhigiri Tubes

we export to countries are as:

USA,, Mumbai, India, UK, Dubai, Melbourne, Sydney, Adelaide, Brisbane, Queensland, Abu Dhabi, Sharjah, Jebel Ali, Fujairah, Doha, Muscat, Bangkok, Istanbul, Amman, Jerusalem, Tehran, Jeddah, Riyadh, Dammam, Kuala Lumpur, Malacca, Seoul, Cairo, Alexandria, Tokyo, Shanghai, Jakarta, Athens, Rome, Cape Town, Europe, Algeria | American Samoa | Andorra | Angola | Argentina | Aruba | Australia | Austria | Azerbaijan | Bahamas | Bahrain | Bangladesh | Belarus | Belgium | Bermuda | Bhutan | Bolivia | Bosnia | Botswana | Brazil | Brunei | Bulgaria | Cambodia | Cameroon | Canada | Africa | Chile | China | Colombia | Croatia| Cyprus | Czech Republic | Denmark | Djibouti | Ecuador | Egypt | Europe | Estonia |Ethiopia | Fiji | Finland | France | Georgia | Germany | Greece | Hong Kong | Hungary | Iceland | Indonesia | Iran | Ireland | Israel | Italy | Japan | New Jersey | Jordan | Kazakhstan | Kenya | Kuwait | Latvia | Lebanon | Lesotho | Lithuania | Luxembourg | Malaysia | Maldives | Mauritius | Mexico | Morocco| Myanmar | Namibia | Nepal | Netherlands | New Zealand | Nigeria | North Korea | Norway | Oman | Peru | Philippines | Poland | Portugal | Qatar | Romania| Russia | Saudi Arabia | Senegal | Serbia |Seychelles | Singapore | Slovakia | Slovenia | South Africa | Georgia | Korea | Spain | Sri Lanka | Suriname | Sweden |Switzerland | Taiwan | Tajikistan | Tanzania | Thailand | Togo | Tunisia |Turkey | Turkmenistan| Uganda | Ukraine | UAE | NZ | United States | United Arab Emirates | Venezuela | Vietnam | Yemen | Zimbabwe | London | Birmingham | Bristol | Manchester | Southampton | Liverpool | Austin | Miami | Houston | Hobart |

Hamburg | Milan | Lisbon | Warsaw | Tehran | Paris | Berlin | Rome | Vienna | Barcelona | Prague | Budapest | Madrid | Munich | Kyiv | Oslo | Helsinki | Zurich | Bucharest | Saint Petersburg | Lagos | SOFLA | Athens | Copenhagen | Amsterdam | Stockholm | Istanbul | Toronto | Bangkok | Ho chin minh | Ottawa | Rio de janerio | Bogota | Sao Paulo | Santiago | Lima | Quito | Caracas | Salvador | Belo Horizonte | Moscow | Nairobi | Cairo | Luanda | Addis Ababa | Kinshasa | Mogadishu | Algiers | Maputo | Abuja | Kampala | Cape Town | Durban | Johannesburg | Antananarivo | Harare | Lusaka | Chicago | Philadelphia | Port – au – Prince | Havana |Vancouver | Washington D.C | Guatemala | Dallas | Phoenix | San Diego | Tokyo | Beijing | Shanghai | Bangkok | Taipei | Seoul | Kuala Lumpur | Hong Kong | Hanoi | Ho Chi Minh | Manila | Jakarta | Osaka | Dhaka | Chiang Mai | Chongqing | Phnom Pehn | Guangzhou | Tianjin | Baghdad | Riyadh | Tehran | Chengdu | Nanjing | Shenzhen | Zhengzhou | Hangzhou | Wuhan | Istanbul | Thimpu | Pyongyang | Nagoya | Quanzhou | Ulaanbaatar | Xi An | Wenzhou | Baku | Yerevan | Tbilisi | Dubai | Abu Dhabi | Sharjah | Ajman | Jeddah | Riyadh | Dammam| Doha | Muscat | Jerusalem | Manila | Male | Kabul | Colombo | Damascus | Kathmandu | Manama | Ashgabat | Bandar Seri Begawan | Dushanbe | Laos | Colombo | Tashkent | Sana’a | Naypyidaw | Sydney | Melbourne | Kolkata | Brisbane | Canberra | Perth | Gold Coast | Adelaide | Hobart | Auckland | Wellington | Christchurch |

Alabama | Alaska | Arizona | Arkansas | California | Colorado | Florida | Georgia | Hawaii | Idaho | illinois | Indiana | Kansas | Louisiana | Maine | Maryland | Massachusetts |'Michigan | Minnesota | Mississippi | Missouri | Montana | Nebraska | Nevada | New Hampshire | New Jersey | New Mexico | New York | North Carolina | Carolina | Ohio | Oklahoma | Pennsylvania | Texas | Virginia | Washington | Wyoming | Utah | Vermont | Alabama | Los Angeles | Chicago | Houston | Phoenix | Philadelphia | San Antonio | San Diego | Dallas | Austin | San Jose | Columbus | Charlotte | Indianapolis | San Francisco | Seattle | El Paso | Boston | Portland | Lousville | Detroit | Baltimore | Atlanta | Miami | Oakland | Orlando | Saint Paul | ST Pittsburgh | Lincoln | ST Louis | Ontario | Hayward | Roseville | Columbia |