IS 1367 grade 10.9

IS 1367 Grades

Mechanical properties of fasteners made of carbon steel and alloy steel As Per IS 1367 Gr. - 10.9

Bolts, screws and studs with specified property classes — coarse thread and fine pitch thread

The IS 1367 Grade 8.8 specification covers carbon steel bolts and studs ranging from M-6 to M-39 diameter. We use high carbon steel material and high alloy steel raw materials to achieve the required properties in this standard. There are three popular grades in this standard, 8.8 , 10.9 and 12.9 which denote material hardness strength and their respective mechanical properties. Refer to the Mechanical Properties Chart for the subtle Strength differences within each grade.

IS 1367 Grade 10.9

10.9

Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines

IS 1367 grade 10.9 Chemical properties

Property class	Material and heat treatment	Chemical composition limit (cast analysis, %)^a					Tempering temperature ⁰C Min.
		C		P	S	B^b
		min.	max.	max.	max.	max.
10.9	Carbon steel with additives (e.g. Boron or Mn or Cr) quenched and tempered	0,20e	0,55	0,025	0,025	0,003	425
	Carbon steel quenched and tempered	0,25	0,55	0,025	0,025
	Alloy steel quenched and tempered^g	0,20	0,55	0,025	0,025

IS 1367 grade 10.9 Mechanical properties

Mechanical or physical property

Tensile strength, R_m, MPa

Stress at 0,2 % non-proportional elongation, R_p0,2, MPa

Stress under proof load, S_p^f, MPa

Proof strength ratio

S_p,nom/R_eL,min

Percentage elongation after fracture for machined test pieces, A, %

Percentage reduction of area after fracture for machined test pieces, Z, %

Height of non-decarburized thread zone, E, mm

Depth of complete decarburization in the thread, G, mm

Reduction of hardness after retempering, HV

Impact strength, K_V^ij, J

nom.^c

min.

nom.c

min.

nom.

min

min.

max.

min.

10.9

1000

1040

900

940

830

0,88

2/3 H1

0,017

IS 1367 grade 10.9 Recommended hardness

Mechanical or physical property	Vickers hardness, HV F ≥98 N		Brinell hardness, HBW F = 30 D²		Rockwell hardness, HRC		Surface hardness, HV 0,3
	Vickers hardness, HV F ≥98 N		Brinell hardness, HBW F = 30 D²		Rockwell hardness, HRC		Surface hardness, HV 0,3
	min.	max.	min.	max.	min.	max.	max.
10.9	320	380	316	375	32	39	390

IS 1367 grade 10.9

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