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Precision Instruments, Inc.

The Finest Torque Products

Incorporated since 1938

Toll-free:(866)T WRENCH
(866)897-3624

All American made from domestic steel

CONVERSION OF VARIOUS UNITS OF TORQUE

Convert

Convert

From

To

Multiply

From

To

Multiply

lb.in.

oz.in.

16

oz.in.

lb.in.

.0625

lb.in.

lb.ft.

.08333

lb.ft.

lb.in.

12

lb.in.

kg.cm.

1.1519

kg.cm.

lb.in.

.8681

lb.in.

kg.m.

.011519

kg.m.

lb.in.

86.81

lb.in.

N•m

.133

N•m

lb.in.

8.85

lb.in.

dN•m

1.13

dN•m

lb.in.

.885

lb.ft.

kg.m.

.1382

kg.m.

lb.ft.

7.236

lb.ft.

N•m

1.356

N•m

lb.ft.

.7376

N•m

dN•m

10

dN•m

N•m

.10

N•m

kg.cm.

10.2

kg.cm.

N•m

.09807

N•m

kg.m.

.102

kg.m.

N•m

9.807

 

 

 

 

 

 

 

 

THREADED FASTENER TENSION GUIDE
( Figures Represent Pounds of Clamping Force )
Stress Area 0.0091 0.0141 0.0175 0.0318 0.0524 0.0775 0.1063 0.1419 0.1819 0.226 0.3344 0.4617 0.6057 0.7632 0.9691 1.4052 1.8993
Outside Diameter No.6 No.8 No.10 1/4" 5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 3/4" 7/8" 1" 1-1/8" 1-1/4" 1-1/2" 1-3/4"
Threads Per Inch 32 32 24 20 18 16 14 13 12 11 10 9 8 7 7 6 5
Torque: 5 lb.in. 205 157                              
10 lb.in. 410 316 315                            
20 lb.in. 820 632 630 337                          
40 lb.in.   1264 1264 674 541                        
80 lb.in.       1348 1082 987                      
10 lb.ft.       2043 1625 1482 1224                    
20 lb.ft.       4092 3250 2964 2448 2143                  
40 lb.ft.         6503 5928 4896 4286 3899                
80 lb.ft.           11857 9796 8572 7799 7065              
100 lb.ft.             12245 10716 9749 8832 7915            
125 lb.ft.               13395 12186 11049 9894            
150 lb.ft.               16091 14623 13261 11872            
175 lb.ft.                 17061 15462 13851 12117          
200 lb.ft.                 19498 17664 15830 13836 12113        
250 lb.ft.                 24373 22100 19788 17296 15142 11985      
300 lb.ft.                   26523 23745 20776 18170 14382 13247    
400 lb.ft.                     31660 27700 24227 19176 17663    
500 lb.ft.                     39576 34592 30284 23971 22079 19754  
750 lb.ft.                       51941 45426 35956 33118 29631 22678

In some cases it may be desirable to know the total clamping force obtained for a given torque. Values are approximate. SAE 30 engine oil was used as lubricant. Use of high stress lube may increase value 20% or more. Highest values for a given size may only be obtained with heat treated bolts having minimum tensile strengths of 150,000 P.S.I. or more.

* Stress area is calculated as the area of the circle whose diameter is the mean between the root and pitch diameters. This closely approximates the actual stress condition. Maximum theoretical clamping force cannot be obtained from threaded fasteners. Additional stresses to the fastener are caused by the torsional forces of tightening.

 

GENERAL TORQUE SPECIFICATION CHART
FOR I.F.I.* METRIC FASTENERS**
( when SAE10 oil is used as a lubricant )

Minimum Tensile ***
Strength Mpa
400 420 520 830 900 1040 1220
Proff Load MPa 225 310 380 600 650 830 970
Property Class 4.6 4.8 5.8 8.8 9.8 10.9 12.9
Bolt Diameter

torque: Newton Metre

metric inch
5mm 0.197 2.9 4 5 - 8 11 12
6mm 0.236 5 7 8 - 14 18 21
7mm 0.276 8 11 14 - 24 30 35
8mm 0.315 12 16 20 - 34 44 50
10mm 0.394 23 32 40 - 70 85 100
12mm 0.472 40 56 70 - 120 150 180
14mm 0.551 65 90 110 - 190 240 280
16mm 0.63 100 140 170 270 290 380 440
20mm 0.787 200 - 330 520 - 740 860
24mm 0.945 340 - 580 920 1260 1480 -
30mm 1.181 680 - - 1820 - 2520 2940
*** Megapascal
** Note: Use only when manufacture's specifications are not available, these values are for stiff
              metal-to-metal joints and are based on 90% of proof load.
DO NOT USE for gaskets joints or joints of soft materials.
* I.F.I. = Industrial fasteners Institute.

 

GENERAL TORQUE SPECIFICATION CHART FOR I.S.O.** METERIC FASTENERS***
( when SAE 10 oil is used as a lubricant )

Minimum
Tensile
Strength

kg/mm2
P.S.I.
40

50

60

80 100 120
56900   71100     85340   113800 142200 170700
Proof kg/mm2 22.6 29.1 28.2 36.4 33.9 43.7 47.5 58.2 79.2 95
Load P.S.I. 32150 41390 40110 51770 48220 62160 67560 82780 112650 135130
Property Class 4.6wpe19.jpg (1895 bytes) 4.8wpe19.jpg (1895 bytes) 5.6wpe19.jpg (1895 bytes) 5.8wpe19.jpg (1895 bytes) 6.6wpe19.jpg (1895 bytes) 6.8wpe19.jpg (1895 bytes) 6.9wpe19.jpg (1895 bytes) 8.8wpe19.jpg (1895 bytes) 10.9wpe19.jpg (1895 bytes) 12.9wpe19.jpg (1895 bytes)

Bolt Diameter

Figures are KILOGRAM METER except those that are bolded which are KILOGRAM CENTEMETER
Metric Inch                    
6mm 0.236 49 63 61 79 74 95 103 126 172 206
8mm 0.315 119 153 148 191 178 230 250 306 417 500
10mm 0.394 235 303 294 379 353 455 495 606 8.2 10
12mm 0.472 411 529 427 662 616 7.9 8.6 10.5 14 17
14mm 0.551 654 8.4 8.2 10.5 10 12 13 17 23 27
16mm 0.63 10 13 12 16 15 20 21 26 36 43
18mm 0.709 14 18 17 23 21 27 30 36 49 59
22mm 0.866 27 35 34 44 41 52 57 70 95 114

*** NOTE: Use only when manufacture's specifications are not available, these values are for stiff metal-to-metal joints and are based on 90% of proof load. DO NOT USE for gasket joints or joints of soft materials
** I.S.O.= International Standardization Organization.

 

Fastener Type Minimum
Tensile
Strength
Material PRODUCTION TORQUE GUIDE
Body size of Outside Diameter
2 3 4 5 6 8 10 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2
Image1.jpg (1142 bytes) S.A.E 2 Steel 74000 P.S.I Low Carbon               6 12 20 32 47 69 96 155 206 310 480 675 900 1100
Image2.jpg (1317 bytes) S.A.E. 5 Steel 120000 P.S.I Medium Carbon Heat Treat               10 19 33 54 78 114 154 257 382 587 794 1105 1500 1775
Image3.jpg (1437 bytes) S.A.E. 7 Steel 133000 P.S.I. Medium Carbon Alloy               13 25 44 71 110 154 215 360 570 840 1325 1825 2500 3000
Image4.jpg (1482 bytes) S.A.E. 8 Steel 150000 P.S.I. Medium Carbon Alloy               14 29 47 78 119 169 230 380 600 900 1430 1975 2650 3200
Image5.jpg (1267 bytes) Socket Head
Cap Screw
160000 P.S.I. High Carbon Quenched Tempered               16 33 54 84 125 180 250 400 640 970 1520 2850 2130 3450

Image10.jpg (894 bytes)

Socket Set
Screw
212000 P.S.I. High Carbon Quenched Tempered         9* 16* 30* 70* 140* 18 29 43 63 100 146            
Image8.jpg (1232 bytes) Machine Screw
Stainless
  18-8 2.6*  4* 5.5* 8* 10* 20* 23* 75* 132* 20 31 43 58 95 130 194 260 400 500   725
Image8.jpg (1232 bytes) Machine Screw
Stainless
  316 2.7* 4* 5.7* 8* 10* 22* 25* 80* 140* 22 34 46 60 100 135 210 280 425 515   750
Image7.jpg (1302 bytes) Machine Screw
Yellow Brass
60000 P.S.I. CU 63 ZN 37 2* 3.3* 4.4* 6.4* 8* 16* 20* 65* 110* 17 27 37 49 78 104 160 215 325 400   595
Image8.jpg (1232 bytes) Silicone Bronze
Type "B"
70000 P.S.I. CU 96 ZNI-5 Min. 2.3* 3.7* 4.9* 7.2* 10* 19* 22* 70* 125* 20 30 41 53 88 117 180 250 365 450   655
Image8.jpg (1232 bytes) Machine Screw
Aluminum
55000 P.S.I. CU 3.8-4.9 1.2-1.8 MN .3-.9 1.4* 2.1* 2.9* 4.3* 5.4* 12* 15* 46* 82* 13 20 27 36 62 83 128 170 255 315   460
Image8.jpg (1232 bytes) Machine Screw
Monel
82000 P.S.I. NI 67 CU 30 FE 1.4 2.5*                   4* 5.5* 8* 11* 21* 27* 87* 155* 23 36 50 67 115 155 235 315 475 585   850
Image8.jpg (1232 bytes) Sems Heat
Treated Steel
120000 P.S.I. 1018 1022

4*

5*

7* 11* 15* 27* 37* 90* 200* 300*                      
Image11.jpg (1284 bytes) Studs Use SAE 2.5 and 8 values when grade is known, with nut of sufficient strength.

All figures are POUND FEET except those marked with an
ASTERISK ( * ) WHICH ARE pound inches.
These values are for lubricated fasteners.

Image12.jpg (1075 bytes) Tapping Screw Set up joint as it will be in production use 70% of over-torque failure as production specifications.