IS 1367 grade 8.8

IS 1367 Grades

Mechanical properties of fasteners made of carbon steel and alloy steel As Per IS 1367 Gr. - 8.8

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 8.8
8.8 Hex bolts, screws, stud bolts, double ended studs, full thread rods, full threaded studs
IS 1367 grade 8.8 Chemical properties

Property class

Material and heat treatment

Chemical composition limit (cast analysis, %)a

Tempering temperature ⁰C

Min.

C

P

S

Bb

min.

max.

max.

max.

max.

8.8

Carbon steel with additives (e.g. Boron or Mn or Cr) quenched and tempered

0,15e

0,40

0,025

0,025

0,003

425

Carbon steel quenched and tempered

0,25

0,55

0,025

0,025

Alloy steel quenched and temperedg

0,20

0,55

0,025

0,025

IS 1367 grade 8.8 Mechanical properties

Mechanical or physical property

Tensile strength, Rm, MPa

Stress at 0,2 % non-proportional elongation, Rp0,2, MPa

Stress under proof load, Spf, MPa

Proof strength ratioSp,nom/ReL,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, KVij, J

nom.c

min.

nom.c

min.

nom.

min.

min.

min.

max.

max.

min.

8.8

d≤ 16 mma

800

800

640

640

580

0,91

12

52

1/2 H1

0,015

20

27

d> 16 mmb

830

640

660

600

0,91

0,016

21

27

IS 1367 grade 8.8 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

min.

max.

min.

max.

min.

max.

max.

8.8

D ≤ 16 mma

250

320

245

316

22

32

-

D > 16 mmb

255

335

250

331

23

34

-

IS 1367 Grade 8.8 Bolts: Engineering Excellence for Structural Integrity

When it comes to securing critical components in demanding environments, our IS 1367 Grade 8.8 bolts represent the pinnacle of fastening technology. These precision-engineered fasteners are designed to provide exceptional strength and reliability in construction, heavy machinery, and industrial applications.

IS 1367 Bolt Specifications and Performance

Our IS 1367 Grade 8.8 bolts deliver impressive performance with a minimum tensile strength of 800 MPa and a yield strength of 640 MPa in grade 8.8. This translates to superior load-bearing capacity and structural integrity under significant stress conditions. Regarding IS 1367 bolt dimensions, we offer comprehensive sizing options from M5 through M80, accommodating virtually any engineering requirement.

Material and Treatment

At Bigboltnut, we utilise premium carbon steel and alloy steels in our manufacturing process, subjecting each bolt to rigorous quenching and tempering heat treatments. This specialised heat treatment optimises the mechanical properties of the fasteners. The precise balance of carbon, manganese, and chromium in our formulation ensures consistent performance characteristics across all production batches, even in the most challenging operational environments.

Surface Protection Solutions

For enhanced durability, our bolts can be finished with black oxide coating, zinc plating, or hot-dip galvanisation according to your specific requirements. These surface treatments provide substantial protection against corrosion, extending service life in outdoor installations, marine settings, and industrial facilities.

IS 1367 Thread Style and Fasteners

Our product range features diverse fastener configurations, including hex head bolts in both fully and partially threaded designs. We adhere to ISO metric thread styles to ensure optimal compatibility with standard nuts and washers, facilitating efficient assembly and maintenance procedures. At Bigboltnut, quality control remains our foremost priority. Our manufacturing process encompasses comprehensive testing for dimensional accuracy, mechanical properties, and surface integrity, guaranteeing that every fastener meets or exceeds IS 1367 standards. Application Versatility IS 1367 Grade 8.8 bolts demonstrate exceptional reliability in steel structures, industrial equipment, wind energy systems, and automotive applications. Wherever uncompromising fastening integrity is essential, our bolts provide the necessary performance assurance. Technical Considerations Torque specifications: For M16 Grade 8.8 bolts, we recommend approximately 210-230 Nm when installed dry. However, we advise consulting application-specific guidelines for optimal installation parameters. Corrosion protection: Our galvanised options are ideally suited for exposure to environmental elements, with special attention given to

Material and Treatment

At Bigboltnut, we utilise premium carbon steel and alloy steels in our manufacturing process, subjecting each bolt to rigorous quenching and tempering heat treatments. This specialised heat treatment optimises the mechanical properties of the fasteners. The precise balance of carbon, manganese, and chromium in our formulation ensures consistent performance characteristics across all production batches, even in the most challenging operational environments.

Surface Protection Solutions

For enhanced durability, our bolts can be finished with black oxide coating, zinc plating, or hot-dip galvanisation according to your specific requirements. These surface treatments provide substantial protection against corrosion, extending service life in outdoor installations, marine settings, and industrial facilities.

IS 1367 Thread Style and Fasteners

Our product range features diverse fastener configurations, including hex head bolts in both fully and partially threaded designs. We adhere to ISO metric thread styles to ensure optimal compatibility with standard nuts and washers, facilitating efficient assembly and maintenance procedures.At Bigboltnut, quality control remains our foremost priority. Our manufacturing process encompasses comprehensive testing for dimensional accuracy, mechanical properties, and surface integrity, guaranteeing that every fastener meets or exceeds IS 1367 standards.

Application Versatility

IS 1367 Grade 8.8 bolts demonstrate exceptional reliability in steel structures, industrial equipment, wind energy systems, and automotive applications. Wherever uncompromising fastening integrity is essential, our bolts provide the necessary performance assurance.

Technical Considerations
  • Torque specifications: For M16 Grade 8.8 bolts, we recommend approximately 210-230 Nm when installed dry. However, we advise consulting application-specific guidelines for optimal installation parameters.
  • Corrosion protection: galvanised options are ideally suited for exposure to environmental elements, with special attention given to maintaining thread tolerance and functionality.
  • Service limitations: engineered for durability, we advise against reusing these fasteners in critical applications after exposure to significant tensile loading.
FAQs
1. Can Grade 8.8 bolts be galvanised for corrosion protection?

Yes, our Grade 8.8 bolts can be hot-dip galvanised for superior corrosion resistance, which is particularly beneficial for outdoor, marine, or corrosive industrial environments.

2. What is the temperature range for safe operation of IS 1367 Grade 8.8 bolts?

IS 1367 Grade 8.8 bolts maintain their mechanical properties between -20°C to 300°C, though prolonged exposure above 200°C may gradually reduce tensile strength.As technical partners, Bigboltnut offers fastener selection, application engineering, and procurement optimisation. Our team of experts provide precise and competent structural fastening solutions, volume pricing, and technical assistance.

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