High Tensile Fasteners

What Is High Tensile Bolts (H T BOLTS)?
1. what’s High Tensile Bolts? Understanding H T Bolts/Fasteners Grades.
2. Engineers, construction, automobile, manufacturing and plenty of services industry professionals know the answer to this and much of other technical questions on fasteners and fixings. But tons folks have questions, what are these numbers on some fasteners and fixings we encounter in our garage, some furniture and other household stuff. Before we answer what’s H T bolts, here are a couple of belongings you got to realize fastener and fixings or bolts. attend following slides and find out…
3. Commonly, most folks know fasteners as bolts, screws or studs. So what’s the difference between a bolt, screw and stud?
4. what’s a Nut & Bolt? The threaded rod that you simply see during this picture may be a bolt Alongside may be a nut and it’s often mated with a bolt.
5. what’s a Screw? A screw is slightly different than a bolt. Screws are externally threaded fasteners. Screws have the power of forming it’s own thread when inserted into the holes inside assembled parts.
6. what’s a Stud? Stud is different from both bolt and screw in appearance and uses. It doesn’t have head at one end sort of a normal fastener. Studs are metal rods otherwise you could say shafts with threads on each side or both ends.
7. So what are those numbers that we see in most of the fasteners?
8. These numbers on fasteners and fixings represent the last word lastingness of a bolt. In Australia, there are 3 different grades of bolts in common use. Commercial Grade Structural Grade High Tensile
9. Commercial Grade: this is often rock bottom grade with a lastingness of 4.6 or 400 MPa. Structural Grade: Structural grade comes next with a lastingness of around 800 MPa or 8.8. High Tensile High tensile bolts are the very best grade with an ultimate lastingness of 1200 MPa or 12.9
10. Presentation of THE WDS GROUP. Australia’s one stop specialized fastener and fixings specialist.

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High Tensile Nut Bolt work-hardening and quenching for the formation of martemperic and austentic layers of hardened core. The benefits of Our High Tensile Stud Bolt include a long service life that will retain an attractive, clean finish with low maintenance cost, therefore contact us.


There are many different varieties of bolt which can be selected based on the particular requirement or the materials involved. Some of the most common types include:

Anchor bolt

Usually embedded in concrete or masonry for structural applications.

Carriage bolt

Used to fasten metal to timber, with a squared undercut to the head which holds the bolt in place once it has been tightened.

Elevator bolt

Commonly used in conveyor systems, an elevator bolt has a flat, plain or countersunk head which holds the bolt in place when tightened.

Flange bolt

Also known as frame bolts, this type of bolt distributes the bearing load using a washer on the undercut of the head.

Hanger bolt

This type of bolt comprises two threaded ends instead of having a head, one of which contains a wood screw.

Hexagon bolt/Tap bolt

A hexagon bolt comprises a head that has six sides, with threading that begins part-way down the shank, whereas a tap bolt’s shank is threaded the whole length.

Huck bolt

A proprietary bolt in which the pin and collar are swaged together using a specialist tool to form a permanent fixing.

Lag bolt

Also known as lag screws, this is a heavy-duty fastener that creates its own mating thread in timber and other soft materials when tightened.

Machine bolt

This type of bolt has a short shank and is intended for assembling metal components through predrilled holes.

Plow bolt

This type of bolt is commonly used in construction tools and other devices due to its durability, and is characterised by its flat countersunk head and square shank neck.

Sex bolt

Rather than requiring a nut, the shank of sex bolts are covered with a ‘mating’ female component. These are useful for fastening components that cannot be exposed to abrasive threads.

Square head bolt

This is similar to a machine bolt in that it has a short shank, in addition to a four-sided bolt head.

Stud bolt

This type of bolt has hexagon nuts on both ends. Components are fastened between the two bolts.

Timber bolt

Bolts that are meant for use with large timber components.

T-head bolt

Has a T-shaped head which can be gripped by a wench and can fit into a slot with ease.

Toggle bolt

This type of bolt has an expanding wing-like nut which helps it to mount objects to walls.


Similar to staples, U-bolts are bent in the shape of a ‘U’ and are partially threaded on both end



 Material Specification High Tensile Bolts
Standard DIN, UNI, ISO, JIS, GB, IS, BS, ASME, ANSI, ASTM and all International Standards
H T Fasteners/ Bolts Size M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M14, M16, M20, M24, M30, M36 to M160
Length 3 mm to 200 mm
High Tensile Bolts, Studs Threads: METRIC, BSW, BSF, UNC, UNF or as required
High Tensile Fasteners Standard: ANSI – American National Standards Institute

  • ANSI B 18.2.4 2M
  • ANSI B 28.2.4 1M
  • High Tensile Stud Bolt length are defined in ASME B16.5 standard
  • High Tensile Hex nuts are defined in ASME B18.2.2
  • ASME B18.5

DIN: DIN 931, DIN 933, DIN 934, DIN 970

UTS – Unified Thread Standard : UNC, UNF, UNEF, UNS, NPT, NPTF

ISO – International Organization for Standardization : ISO 4032, ISO 4033, JIS standards

Source of raw materials Tata Steel, JSPL, RINL, Usha Martin, Dhamm Steel, Mukund Steel etc.
  • Hot Forged H T Fasteners, Nut / Bolt; up to M36 / 1-1/2” Dia, up to 1100mm lg
  • CNC Machined H T Fasteners, Nut / Bolt; up to M100 / 4” Dia, up to 1500mm lg
H T Fasteners In Form of: Hex, Square, Round, Threading as per Gauge Etc.
Head drive: Phillips, Slotted, Phillips/Slot, Six-Lobe, etc
High Tensile bolting Test Certificate: Manufacturer Test Certificate as per EN 10204 / 3.1
H T Fasteners finishing: Zinc (yellow, white, blue, black), black oxide,
Geometry, Dacroment, anodizing, nickel plated, plated zinc-nickel, High Tensile : Passivated
Self-Colour, Hot Dip Galvanised (HDG), Bright Zinc Plated (BZP), Sherardized, High Tensile , Mechanically Applied coating and some special one like DACROMET
Production process M2-M24: Cold Froging, hot forging M24-M100, machining and CNC for Customized connecting element
High Tensile bolting materials Surface Coating:
  • Teflon Coated Fasteners
  • Phosphate Coated Fasteners
  • Zinc Coated Fasteners
  • Ptfe Coated H T Fasteners
  • Xylon Coated Fasteners
  • Cadmium Coated Fasteners
  • Hot Dipped Galvanizing Coated Fasteners

All surface finishes offered including Geomet & PTFE, Galvanised, Zinc, Electroless Nickel, Sherardized, Dacromet

Popular Types of High Tensile Bolts Hex Bolts, Flange Bolts, Hex Head Bolts, Lag Bolts, Square Bolts, Eye Bolts, U Bolts, T Bolts, Counter sunk Bolts etc.
Popular Types of High Tensile Nut Eye, Dome, Hex Head Nut, Panel, Lock, Coupling, Square, Acorn, T, Wing etc.
Popular Types of High Tensile Screw Socket Set Fasteners, Anchor Fasteners, Blind Fasteners, Threaded Fasteners, Socket Head Fasteners, Machine Fasteners, Concrete Fasteners, Shoulder Fasteners, Panel Fasteners, Hex Head Cap Fasteners etc.
Popular Types of High Tensile Washer Machine Washers, Star Washers, Flat Washer, Lock Washer, Split Washer, Sealing Washer etc.
H T Fasteners Packing: IN BULK: canton, pallet, Small Boxs / carton / pallet, or customer request

Understanding the Grading of High Tensile Bolts

When it comes to fastener and fixings, high tensile bolts are some of the best you can offer your customers. These bolts are an important part of many home improvement projects, auto manufacturing and repairs, and other projects.

Choosing the right industrial fastener to offer can be difficult, however, especially if you are thinking of offering high tensile bolts. There are several different grades you should be aware of, because each grade defines what a bolt is capable of being used for.

Tensile Bolt Grading

When purchasing high tensile bolts, there are two main grades you should be aware of: ‘S’ and ‘8.8’ Many times, two fastener and fixings look and feel the same, and there’s a reason why.

· 8.8– This type of grade is often referred to as the structural grade for bolts. These types of bolts often have galvanised hexagon heads, and most are made with zinc or are zinc plated. To identify this grade, look out for an ‘8.8’ stamp or a set of three radial lines on the head of the bolt. Most often, customers looking for a high tensile bolt may just be looking for the 8.8 grade.

· S- An S grade refers to the tensile strength of industrial fastener, or the maximum amount of stress these fastener and fixing can withstand before they begin to break or fail. When a bolt has a grading of S, it means that it can withstand a stress of 45 to 49.9 metric tonnes per 6.45 cm². This grading, which is typically stamped on the head of the bolt, has the same tensile strength as a grade 8.8 bolt.

Bolts labelled with the grade 8.8 or S are solid, heavy duty bolts that can be used for a variety of tasks. However, it is important to understand that other grades are also available, although perhaps not used as often.

· 4.6- These types of bolts are considered to be commercial grade and are not as strong as an 8.8. In vehicles, they are often used to hold light objects like trim. Most customers will not need this type of bolt except in circumstances where strength is not an issue.

· 12.9- These fasteners and fixings are meant for the heaviest jobs, like securing engines and ensuring drives are tamper proof.

· R- This grading can withstand 40.8 to 45 metric tonnes per 6.45 cm², and while it used to be popular, it is now quickly being replaced with the more common and efficient S grade.

What Does a Grade Mean?

The grade of your industrial fasteners not only determines how much stress they are able to stand, but also why type of tool must be used to tighten them. For a grade 8.8, you must use the part turn method of tightening with a torque wrench; this is where the fold is fit snug tight with your fingers and then advanced up to three turns, depending on length and size. Indicating washers may also be used in the part turn method, and added security of the joint can be accomplished by using other fasteners and fixings, such as spring washers, wired heads, nuts, and split pin