Drive_Index
Gears Gearboxes


Material Properties Tables for Spur, Helical and Bevel Gears



Important Note:
The table below provides very general information for use with approximate gear endurance equations .. ref Gears Durability Calculations..

Detailed gear designs should be based on more accurate information available using the relevant standards..



Suffix 1 relate to the driving gear (generally the pinion)
Suffix 2 relate to the driven gear (generally the gear)


Cp = Imperial elastic coefficient
ZE = ISO elastic coefficient


Design factors for gear pairs

Material Poissons Ratio (n) Young's Modulus ( E ) Allowable Surface
Endurance Stress ( S e)		 K
for a = 20 deg		 Cp Ze
Pinion Gear Pinion Gear Pinion Gear Pinion Gear        
        psi psi MPa MPa psi MPa psi MPa Öpsi ÖMPa
Steel.BHN Av=150 0.3 0.3 3.00E+07 3.00E+07 2.07E+05 2.07E+05 50000 345 41 0.281 2291 190
Steel.BHN Av=175 0.3 0.3 3.00E+07 3.00E+07 2.07E+05 2.07E+05 60000 414 59 0.404 2291 190
Steel.BHN Av=200 0.3 0.3 3.00E+07 3.00E+07 2.07E+05 2.07E+05 70000 483 80 0.550 2291 190
Steel.BHN Av=225 0.3 0.3 3.00E+07 3.00E+07 2.07E+05 2.07E+05 80000 552 104 0.719 2291 190
Steel.BHN Av=250 0.3 0.3 3.00E+07 3.00E+07 2.07E+05 2.07E+05 90000 621 132 0.910 2291 190
Steel.BHN Av=275 0.3 0.3 3.00E+07 3.00E+07 2.07E+05 2.07E+05 100000 689 163 1.123 2291 190
Steel.BHN Av=300 0.3 0.3 3.00E+07 3.00E+07 2.07E+05 2.07E+05 110000 758 197 1.359 2291 190
Steel.BHN Av=325 0.3 0.3 3.00E+07 3.00E+07 2.07E+05 2.07E+05 120000 827 235 1.617 2291 190
Steel.BHN Av=350 0.3 0.3 3.00E+07 3.00E+07 2.07E+05 2.07E+05 130000 896 275 1.898 2291 190
Steel.BHN Av=375 0.3 0.3 3.00E+07 3.00E+07 2.07E+05 2.07E+05 140000 965 319 2.201 2291 190
Steel.BHN Av=400 0.3 0.3 3.00E+07 3.00E+07 2.07E+05 2.07E+05 150000 1034 366 2.527 2291 190
Stl BHN=150 Cast Iron 0.3 0.211 3.00E+07 2.20E+07 2.07E+05 1.52E+05 50000 345 48 0.332 2077 172
Stl BHN=250 Cast Iron 0.3 0.211 3.00E+07 2.20E+07 2.07E+05 1.52E+05 70000 483 94 0.650 2077 172
Stl BHN=350 Cast Iron 0.3 0.211 3.00E+07 2.20E+07 2.07E+05 1.52E+05 90000 621 156 1.075 2077 172
Stl BHN=150 Phos Bros 0.3 0.38 3.00E+07 1.45E+07 2.07E+05 1.00E+05 59000 407 62 0.600 1888 157
Stl BHN=250 Phos Bros 0.3 0.38 3.00E+07 1.45E+07 2.07E+05 1.00E+05 65000 448 100 0.728 1888 157
Stl BHN=350 Phos Bros 0.3 0.38 3.00E+07 1.45E+07 2.07E+05 1.00E+05 85000 586 184 1.245 1888 157
Cast Iron Cast Iron 0.211 0.211 2.20E+07 2.20E+07 1.52E+05 1.52E+05 90000 621 264 1.240 1914 159
Cast Iron Phos Bros 0.211 0.38 2.20E+07 1.45E+07 1.52E+05 1.00E+05 83000 572 234 1.328 1763 146



Gear Materials Properties

  Material................ Specification.............. Ultimate Tensile
Strength		 Yield Tensile
Strength		 Tooth Hardness
- Core		 Tooth Hardness
- Side		 Allowable Endurance
Stress		 Allowable Bending
Stress		 Young's Modulus Poison's Ratio
      Rm Rp(0.2) VPN VPN Se Sb E  
      MPa MPa HV HV MPa MPa GPa  
1 Grey Cast Iron BS EN 1561:1997
EN-GJL-200 		200 100 200 200 340 95 91 0.25
2 Grey Cast Iron BS EN 1561:1997
EN-GJL-250		 250 125 220 220 350 105 105 0.25
3 Grey Cast Iron BS EN 1561:1997
EN-GJL-300		 300 150 240 240 360 120 113 0.25
4 Ductile Cast Iron BS EN 1563:1997
EN-GJS 600-2		 600 370 190 190 430 315 169 0.2
5 Ductile Cast Iron BS EN 1563:1997
EN-GJS 700-2		 700 420 230 230 510 325 169 0.2
6 Ductile Cast Iron BS EN 1563:1997
ENGJS 800-2		 800 480 250 250 550 345 169 0.2
7 Carbon Cast Steel
Normalised		 BS 3100:1991
A3, A5 **		 500 260 150 150 420 300 206 0.3
8 Carbon Cast Steel
Normalised		 BS 3100:1991
A3, A5 **		 590 300 180 180 480 336 206 0.3
9 Alloy Cast Steel
Normalised		 36Mn5 (1,1167) 700 340 210 210 540 372 206 0.3
10 Alloy Cast Steel
Heat Treated		 36Mn5 (1,1167) 750 400 220 220 560 384 206 0.3
11 Alloy Cast Steel
Normalised		 BS EN 10213-2:1996
G17CrMo511		 650 380 200 200 520 360 206 0.3
12 Alloy Cast Steel
Heat Treated		 BS EN 10213-2:1996
G17CrMo511		 800 550 245 245 610 414 206 0.3
13 Structural Steel
Untreated		 BS EN 10025-1:2004
E295		 490 295 150 150 370 330 206 0.3
14 Structural Steel Untreated BS EN 10025-2:2004
S335J2G3		 510 335 155 155 380 336 206 0.3
15 Structural Steel
Untreated		 BS EN 10025-2:2004
E335		 588 335 175 175 420 360 206 0.3
16 Structural Steel
Untreated		 BS EN 10025-2:2004
E360		 686 360 205 205 480 396 206 0.3
17 Carbon Structural Steel
normalised		 BS EN 10083-2
C45		 540 325 155 155 430 356 206 0.3
18 Carbon Structural Steel
heat treated		 BS EN 10083-2:1991
C45		 640 390 200 200 520 410 206 0.3
19 Carbon Structural Steel
normalised		 BS EN 10083-1:1991
C60/ER		 660 380 200 200 520 410 206 0.3
20 Carbon Structural Steel
heat treated		 BS EN 10083-1:1991
C60E/R		 740 440 235 235 590 452 206 0.3
21 Alloy Structural Steel
Heat Treated		 BS EN 10083-1:1991
37Cr4		 883 637 285 285 690 512 206 0.3
22 Alloy Structural Steel
Heat Treated
42CrV6 (1,7561) 		980 850 300 300 720 530 206 0.3
23 Alloy Structural Steel
Heat Treated
31NiCr14 (1,5755)		 932 785 290 290 700 518 206 0.3
24 Carbon Cast Steel
tooth face hardened		 BS 3100:1991
A3,A5,AW2		 590 300 180 600 1140 316 206 0.3
25 Carbon Cast Steel
tooth face hardened		 36Mn5 (1,1167) 700 340 210 600 1140 352 206 0.3
26 Carbon Structural Steel
tooth face hardened		 BS EN 10083-2:1991
C50		 640 390 200 600 1140 390 206 0.3
27 Alloy Structural Steel
tooth face hardened		 BS EN 10083-1:1991
37Cr4		 785 539 250 600 1140 450 206 0.3
28 Alloy Structural Steel
tooth face hardened		 42CrV6 (1,7561) 980 850 315 600 1160 528 206 0.3
29 Alloy Structural Steel
tooth face hardened		 BS EN 10083-1:1991
34CrNiMo6		 965 750 300 600 1160 705 206 0.3
30 Alloy Structural Steel
Nitrided		 42MnV7 (1,5223) 800 620 250 550 930 580 206 0.3
31 Alloy Structural Steel
Nitrided		 30CrV9 800 600 250 800 1180 705 206 0.3
32 Alloy Structural Steel
Nitrided		 30CrMoV9 (1,7707) 800 600 250 800 1180 705 206 0.3
33 Alloy Structural Steel
Nitrided		 BS EN 10083-1:1991
34CrNiMo6		 965 750 300 750 1180 730 206 0.3
34 Alloy Structural Steel
Nitro Case hardened		 BS EN 10083-1:1991
37Cr4		 1570 1350 485 615 1288 740 206 0.3
35 Carbon Structural Steel
case hardened		 BS EN 10277-2:1999
C10		 440 275 135 650 1210 500 206 0.3
36 Carbon Structural Steel
case hardened		 >C15E (1,1149 ) 495 295 150 650 1210 500 206 0.3
37 Alloy Structural Steel
case hardened		 16MnCr5 (1,7131) 785 588 250 650 1270 700 206 0.3
38 Alloy Structural Steel
case hardened		 35CrMo4 880 685 285 650 1270 700 206 0.3
39 Alloy Structural Steel
case hardened		 15NiCr6 880 635 285 650 1270 700 206 0.3
40 Alloy Structural Steel
case hardened		 14NiCr14(1.5732) 932 735 300 650 1270 700 206 0.3
41 Carbon Steel
Nitro caburised		 BS EN 10083-1:1991
C60E/R		 740 440 235 235 800 650 206 0.3
42 Carbon Steel
tooth face hardened		 BS EN 10083-2
C50		 640 390 200 600 1140 605 206 0.3
43 Alloy Steel
tooth face hardened		 BS EN 10083-1
37Cr4		 900 700 250 600 1140 605 206 0.3
44 Bronze Sand Cast   276       207 39 100 0.38
45 Bronze Heat Treated   621       448 163 100 0.38

Note: Gear Properties for Nylon gears are available using download Dupont -Gears






Links to Relevant Information
  1. QTC Gear bending Strength Calculations ...Gear bending strength calculation with associated links
  2. QTC Gear surface strength calculations .. Calculations and tables for gear surface strength calculations


Drive_Index
Gears Gearboxes

Remember - the information on this site is for general information purposes only and while we endeavour to keep the information up to date and correct, we make no representations or warranties of any kind, express or implied, about its completeness, accuracy, reliability, suitability or availability. Any reliance you place on such information is therefore strictly at your own risk.

Roy Beardmore passed away on 9th March 2013. He is sadly missed. This website, Roymech, has been an invaluable resource for engineers around the world and we hope to maintain this incredible legacy going forward.

Have a question? Contact us.

© 2020 Roymech.org