Grade 10 nut

Material：Carbon steel 45#
Strength Grade：Grade 10
Surface Treatment：Electro-galvanized/Hot-dip galvanized (optional)
Thread Specifications：M6-M10, M12-M24

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Product description

Grade 10 nuts are a prime example of high-strength nuts. They are primarily designed to be used in conjunction with Grade 10.9 bolts to meet the demands of heavy-duty, high-stress connections, and are widely used in critical structures within the mechanical engineering, construction and transport sectors.
Grade 10 nuts are specifically designed to be used with Grade 10.9 bolts. They achieve a balance of high strength and toughness through quenching and tempering heat treatment, providing a reliable connection in environments subject to heavy loads, vibration and high stress. When using them, it is essential to strictly adhere to the matching guidelines and installation specifications to ensure structural safety and durability.

Types of nuts

Nut grade

Tensile strength (MPa)

Suitable bolt grade

Typical applications

Grade 8

≥800

8.8 or below

General machinery, non-critical structures

Grade 10

≥1000

Grade 10.9 and below

Heavy-duty machinery, critical joints in steel structures

Grade 12

≥1200

12.9 and below

Ultra-high-pressure equipment, aerospace

Performance Features

  • High strength grade：With a performance grade of 10, it guarantees a tensile strength of ≥900 MPa. It is specifically designed to be used with Grade 10.9 bolts, whilst also being compatible with Grade 8.8 bolts and below; its strength is no less than that of the matching bolts, making it resistant to thread slippage and stripping.
  • High load-bearing capacity：Outstanding tensile, shear and compression resistance, capable of withstanding heavy loads, impact and alternating loads; frequently used in critical load-bearing connections.
  • Quenched and tempered：Typically manufactured from medium-carbon steel or alloy steel via quenching and high-temperature tempering, with a stable hardness of HV 320–380. This ensures high strength whilst retaining a degree of toughness, minimising the risk of brittle fracture.
  • High Thread Fitting Precision：The internal thread precision is typically 6H, ensuring a tight engagement with the bolt, uniform load distribution and excellent assembly stability.
  • High adaptability：Available in Type 1, Type 2 (thicker, higher load-bearing capacity) and large hex nuts for steel structures, meeting the requirements of various applications such as machinery and steel structures.
  • Strict matching requirements：Must not be used with Grade 12.9 bolts, as the nut will fail first due to insufficient strength, compromising the safety of the connection.

Installation guidelines

Use a calibrated torque wrench and calculate the preload using the formula T = K × F × d.
Ensure that the friction surfaces are clean and dry to prevent grease from affecting the coefficient of friction.
Tighten in a symmetrical, step-by-step manner from the centre outwards to prevent stress concentration.