What are the properties of a bolt?

What are the three properties that identify bolts?

Fasteners are identified by four or five attributes; Type, Material, Diameter, Length, and Thread Pitch or Count (machine thread fasteners only).

What are the properties of nuts and bolts?

Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. The two partners are kept together by a combination of their threads’ friction (with slight elastic deformation), a slight stretching of the bolt, and compression of the parts to be held together.

What is a property of a screw?

Tensile Strength. This is how much axial load a screw can withstand without breaking. Yield Strength. Yield strength is the amount of resistance of a material to plastic deformation, so it determines how much stress a screw must withstand with the bolt being permanently elongated. Proof Strength.

What is bolt property class?

Metric steel bolts, screws and studs – proof and tensile strength

Property Class Size Range (mm) Minimum Tensile Strength (106 Pa)
5.8 M5 – M24 520
8.8 M1.6 – M36 830
9.8 M1.6 – M16 900
10.9 M5 – M36 1040
IT IS INTERESTING:  What is overhauling of power screw?

What material is a Grade 5 bolt made of?

Grade 5. Grade 5 alloy steel is a medium carbon zinc plated alloy steel that is heat treated to increase hardness. Grade 5 bolts have three (3) evenly spaced hash marks on the head markings (manufacturers mark may also be included).

What is bolt hardness?

(5) Hardness of thread tip surface of bolts, screws and implant bolts shall be 250HV, 238HB or 99.5HRB or below. (6) The surface hardness of products of tensile strength ranking 8.8 – 12.9 must have no difference from the internal hardness by over 30 points with the Vickers hardness HV0.

What is the shear strength of a bolt?

The shear strength of a bolt is a measurement of the minimum amount of force needed to break the bolt into two pieces. The shear strength of a metal bolt is approximately 0.6 times its tensile strength. A bolt commonly shears where its head meets the threads.

What are bolt grades?

The grade of a bolt determines the maximum amount of stress (tensile strength) that the bolt can handle. Tensile strength is the amount of pull the bolt can withstand before breaking. The method used for tightening the bolt is also dependent upon the grade of the bolt.

What are the 4 properties of a screw?

Other mechanical properties of steel bolts include:

  • Fatigue strength. The maximum stress a fastener can endure for a specific number of cycles before failing.
  • Torsional strength. The torque load at which a fastener fails by becoming twisted off at its axis.
  • Hardness. …
  • Ductility. …
  • Toughness.

Is bolt a specification 1367?

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.

IT IS INTERESTING:  What screws will never rust?

What is meant by 8.8 grade bolt?

In the case of a 8.8 grade bolt the first figure signifies that the Tensile Strength is at least 800MPa. The second figure signifies that the fastener will begin to yield at 80% of the Ultimate Tensile Strength, i.e. at least 640MPa.

What is bolt grade A?

Grades of Bolts – Bolt Grade Markings & Bolt Strength Chart

Bolt Grade Markings & Strength Chart – Metric Steel Bolts
Head Marking Grade/Specification Tensile Strength min (MPa)
Class 10.9 1040 (150,000 psi)
Class 12.9 1220 (176,000 psi)
Usually stamped A-2 or A-4 A2 & A4 Stainless 500 Min 700 Typical

What does 4.6 mean on a bolt?

In 4.6, The first number 4 indicates 1/100 of nominal tensile strength . Hence the tensile strength = 400 Mpa. The second number indicates 10 times the ratio between lower stress(proof stress) and nominal tensile strength(yield stress ratio) means, 10 times the yield stress = 10 x 240/400 = 2400/400 = 6.

How strong is a 4.8 bolt?

Mechanical properties

Grade, material & condition Nominal thread diameter size range [mm] Yield strength (min) [MPa]
Class 4.8 Low or medium carbon steel; fully or partially annealed 1.6–16 340
Class 5.8 Low or medium carbon steel; cold worked 5–24 420
Class 8.8 Medium carbon steel; quench and tempered Under 16 (inc.) 640
17–72 660