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Permissible Strenth of Structural Bolts As Per Is 800: 2007

The document summarizes permissible strength values for structural bolts according to IS 800:2007. It provides tensile and shear strength values for property classes 4.6, 6.8, and 8.8 bolts with diameters ranging from 12mm to 36mm. It also lists bearing strength values for mild steel plates of various thicknesses when used with bolts of classes 4.6, 6.8, and 8.8. Notes provide additional information on factors like net tensile area, ultimate tensile stresses, coefficient of friction, and ultimate tensile stress for mild steel.

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1K views2 pages

Permissible Strenth of Structural Bolts As Per Is 800: 2007

The document summarizes permissible strength values for structural bolts according to IS 800:2007. It provides tensile and shear strength values for property classes 4.6, 6.8, and 8.8 bolts with diameters ranging from 12mm to 36mm. It also lists bearing strength values for mild steel plates of various thicknesses when used with bolts of classes 4.6, 6.8, and 8.8. Notes provide additional information on factors like net tensile area, ultimate tensile stresses, coefficient of friction, and ultimate tensile stress for mild steel.

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Hutia Com
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© © All Rights Reserved
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PERMISSIBLE STRENTH OF STRUCTURAL BOLTS AS PER IS 800 : 2007

PROPERTY CLASS 4.6 6.8 8.8


BOLT DIA CROSS NET AREA TENSILE SHEAR SHEAR TENSILE SHEAR SHEAR TENSILE SHEAR SHEAR SLIP
(mm) AREA (mm^2) STRENGTH STRENGTH STRENGTH STRENGTH STRENGTH STRENGTH STRENGTH STRENGTH STRENGTH RESISTANCE
(mm^2) (KN) (KN) for (KN) for (KN) (KN) for (KN) for (KN) (KN) for (KN) for (KN)
single double single double single double
shear shear shear shear shear shear
12 113 88.22 31.76 16.30 32.60 47.64 24.45 48.90 63.52 32.60 65.19 7.90
16 201 156.83 56.46 28.98 57.95 84.69 43.46 86.93 112.92 57.95 115.90 14.05
20 314 245.04 88.22 45.27 90.55 132.32 67.91 135.82 183.05 93.94 187.89 22.78
25 491 382.88 137.84 70.74 141.48 206.76 106.11 212.22 286.01 146.79 293.57 35.59
32 804 627.31 225.83 115.90 231.80 338.75 173.85 347.70 468.60 240.49 480.99 58.32
36 1018 793.94 285.82 146.69 293.37 428.73 220.03 440.06 593.08 304.38 608.75 73.80

NOTE:
1) THE RATIO OF NET TENSILE AREA AT ROOT OF THREADS TO NOMINAL PLAIN SHANK OF THE BOLT TAKEN AS 0.78
2) ULTIMATE TENSILE STRESS FOR GRADE 4.6= 400 Mpa
6.8= 600 Mpa
8.8(d<=16)= 800 MPa
8.8 (d>16) =830 MPa
3) COEFFICIENT OF FRICTION ()= 0.20
4) NUMBER OF INTERFACES OFFERING FRICTIONAL RESISTANCE TO SLIP (n)=1
5) FASTENERS IN CLEARENCE HOLES (K) =1
6) ULTIMATE TENSILE STRESS FOR M.S PLATE= 410 Mpa
4.6, 6.6 & 8.8
BEARING STRENGTHS (KN) FOR M.S
PLATES OF THICKNESS

8 10 12 16 20
39.36 49.20 59.04 78.72 98.40
52.48 65.60 78.72 104.96 131.20
65.60 82.00 98.40 131.20 164.00
82.00 102.50 123.00 164.00 205.00
104.96 131.20 157.44 209.92 262.40
118.08 147.60 177.12 236.16 295.20

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