18 Different Types of Bolts

18 Different Types of Bolts

Bolts are essential components in manufacturing and construction industries. They are used for complex machinery in automobiles, bridges, and buildings due to their strong structure. Bolts play a crucial role in keeping everything together.

Bolts are external fasteners that are manufactured to be inserted through holes in assembled parts. They are typically tightened or loosened by turning a nut.

There are many types of bolts, each with different shapes, but they all share common properties. Most bolts have a threaded cylindrical rod, a head at one end, and a nut at the other end.

Table of contents

  • Sizes of All Types of Bolts
  • Specification of Hex Bolt
  • Tolerance of stainless steel Hex Bolts
  • Head Types of High Tensile Bolts
  • Flange Bolting Chart
  • Benefits of SS Flange Bolts
  • Components of an Eye Bolt
  • Various Types of Eye Bolts & Applications
  • Dimensional Standards of T-Head Bolts
  • Tolerance Standards Concrete of T-Head Bolts
  • Types of J Bolt
  • Uses of J Anchor Bolts
  • Hex Head Anchor Bolt Interior Uses
  • Exterior Use of Stainless Steel Anchor Bolts
  • Test Certificates of Elevator Bolts
  • Tensile Strength of Lag Bolts
  • Tolerance on Length of Hanger Bolts
  • Advantages of Plow Bolt
  • Advantages & Disadvantages of Machine Bolts & Stud Bolts
  • Strength and Durability of Arbor bolts
  • Properties of Blind Bolt
  • Low Carbon & Hot Dipped Galvanized Carriage Bolt Physical Properties
  • Key Characteristics of Rock Bolts
  • Technical Specifications of Serrated Flange Bolts
  • Difference between Commercial Grade Shoulder Screws & Precision Shoulder Screws
  • Head Types of Socket Head Bolts
  • Application & Uses Of Square Bolts
  • Surface Treatment Of U Bolt
  • Toggle Bolts Key Characteristics
  • Tensile Strength of Track Bolts

Different Types of Bolts

Sizes of All Types of Bolts

Bolt Type Metric Size Imperial Size
Hex Bolt M5 – M56 1/4" – 2"
Anchor Bolts M10 to M100 3/8 to 8"
Elevator Bolts M10 to M100 3/8 to 8"
Eye Bolts M10 to M100 3/8 to 8"
Flange Bolts M10 to M100 3/8 to 8"
J-Bolts M10 to M100 3/8 to 8"
Lag Bolts M10 to M100 3/8 to 8"
Hanger Bolts M10 to M100 3/8 to 8"
Plow Bolts M3-M60 1/2" – 3"
Machine Bolts M10 to M100 3/8 to 8"
Arbor Bolts M6-M20 1/2 to 5/8"
Blind Bolts M6-M16 1/2 to 5/16"
Carriage Bolts M10 to M100 3/8 to 8"
Rock Bolts M24-M36 1 to 1-1/2"
Serrated Flange Bolts M6-M20 1/2 to 5/8"
Shoulder Bolts M10 to M100 3/8 to 8"
Socket Head Bolts M3-M20 1/4 to 5/16"
Square Bolts M2-M160 3/8 to 8″
T-Head Bolts M6-M16 1/4 to 5/8"
Tap Bolts M6-M24 1/2 to 5/16"
Toggle Bolts M4-M10 1/4 to 5/16"
Track Bolts M6-M20 1/2 to 5/16"
U-Bolts M10 to M100 3/8 to 8"

Hex Bolts Are Characterised by Their Six-sided Hexagonal-shaped Head

Hex bolts are also known as hex head bolts or hexagonal bolts because of their special head shape.

It is a type of threaded bolt, which can be fully or partially threaded. It is suitable for a wide range of applications, such as construction and machinery.

Its versatility makes it suitable for various industrial applications. It is available in several sizes, materials, and finishes, providing the scope to choose the best bolt for your specific application.

Specification of Hex Bolt

  • Metric Size: Dia M5 – M56
  • Lengths: 10mm – 800mm
  • Imperial Size: Dia 1/4″ – 2″ & Lengths 1/2″ – 9-1/2″
  • Threads: UNC, UNF, SAE, BSW
  • Finish: Zinc Yellow, Hot Dip Galvanised,Plain, Zinc Plated, Mechanical Galvanised, Stainless Steel
  • Surface Treatment: Passivation , Plain

Tolerance of stainless steel Hex Bolts

Nominal Screw Size
Nominal Screw Length
 Over 1 in. to2-1/2 in., incl. Up to 1in., incl. Over 4 in. to 6 in., incl. Over 2-1/2 in. to4 in., incl. Longer than 6 in.
1/4 to 3/8 ±0.02, -0.04 ±0.02, -0.03 ±0.06, -0.10 ±0.04, -0.06 ±0.10, -0.18
7/16 and 1/2 ±0.02, -0.06 ±0.02, -0.03 ±0.08, -0.10 ±0.06, -0.08 ±0.12, -0.18
7/8 and 1 ±0.02, -0.10 … ±0.12, -0.16 ±0.10, -0.14 ±0.16, -0.20
9/16 to 3/4 ±0.02, -0.08 ±0.02, -0.03 ±0.10, -0.10 ±0.08, -0.10 ±0.14, -0.18

Head Types of High Tensile Bolts

Bolt Head Type Where It’s Used
Hex Head Building Structures and machines
Socket Head Machines, cars,
Flat Head Woodworking, or any application
Pan Head Electronics and machinery
Round Head Decorative purposes
Hexagon Socket Head Situations where you can’t access the back
Torx Head Automotive, electronics
Slotted Head where less torque is required
Phillips Head General purpose
Wing Head Furniture assembly
Square Head specific applications
Dome Head Decorative or prominent parts
Knurled Head Manual adjustments

bolt head type

Flange Bolts Are Available for Class 150 to 1500 Flanges

It is a versatile fastener which plays an important role in several industries. Its distinctive design makes it applicable for better weight distribution which helps it become useful for applications which need safe fastening.

It can be used for class 150 TO 1500 flanges, where the flange which needs resistance at high temperature. Which is essential for guaranteeing the safety, effectiveness and reliability of the resultant product. The below given chart will give an idea which class will be helpful for your applications.

Flange Bolting Chart

  Nominal Pipe Size (Inches) RF Height 1/2 3/4 1 1 1/4 1 1/2 2 2 1/4 3 3 1/2 4 5 6 8 10 12 14 16 18 20 24
Class150 Number of Bolts   4 4 4 4 4 4 4 4 8 8 8 8 8 12 12 12 16 16 20 20
Diameter of Bolt   1/2 1/2 1/2 1/2 1/2 5/8 5/8 5/8 5/8 5/8 3/4 3/4 7/8 7/8 7/8 1 1 1 1/8 1 1/8 1 1/4
Stud Bolt Length 0.06 2 1/4 2 1/2 2 1/2 2 3/4 3 3 3 1/2 3 1/2 3 1/2 3 1/2 3 3/4 4 4 1/4 4 1/2 43/4 5 1/4 5 1/4 53/4 6 1/4 63/4
Machine Bolt Length 0.06 2 2 2 1/4 2 1/4 2 1/2 2 3/4 3 3 3 3 3 1/4 3 1/4 3 1/2 4 4 4 1/2 4 1/2 5 5 1/2 6
Class300 Number of Bolts   4 4 4 4 4 8 8 8 8 8 8 12 12 16 16 20 20 24 24 24
Stud Bolt Length 0.06 2 1/2 3 3 3 1/4 3 1/2 3 1/2 4 4 1/4 4 1/4 4 1/2 43/4 43/4 5 1/2 6 1/4 63/4 7 7 1/2 73/4 8 9
Machine Bolt Length 0.06 2 1/4 2 1/2 2 1/2 2 3/2 3 3 3 1/4 3 1/2 3 3/4 3 3/4 4 1/4 41/4 43/4 5 1/2 53/4 6 1/4 6 1/2 6 3/4 7 1/4 8
Class400 Number of Bolts   4 4 4 4 4 8 8 8 8 8 8 12 12 16 16 20 20 24 24 24
Stud Bolt Length 1/2 3 3 1/2 3 1/2 3 3/4 4 1/4 41/4 43/4 5 5 1/2 5 1/2 53/4 6 63/4 7 1/2 8 8 1/4 8 3/4 9 9 1/2 10 1/2
Class600 Number of Bolts   4 4 4 4 4 8 8 8 8 8 8 12 12 16 20 20 20 20 24 24
Stud Bolt Length 1/2 3 3 1/2 3 1/2 3 3/4 4 1/4 4 1/4 43/4 5 5 1/2 53/4 6 1/2 63/4 7 1/2 8 1/2 03-Mar 9 1/4 10 10 3/4 11 1/4 13
Class900 Number of Bolts   4 4 4 4 4 8 8 8   8 8 12 12 16 20 20 20 20 20 20
Raised Face 0.25 in. 1/2 3 3 1/2 3 1/2 3 3/4 4 1/4 4 1/4 4 3/4 5.75   6.75 7.5 7.5 8.75 9.25 10 10.75 11.25 12.75 13.75 17.25
Class1500 Number of Bolts   4 4 4 4 4 8 8 8   8 8 12 12 12 16 16 16 16 16 16
Raised Face 0.25 in. 1/2 4.25 4.5 5 5 5.5 5.75 6.25 7   7.75 9.75 10.25 11.5 13.25 14.75 16 17.5 19.5 21.25 24.25

Benefits of SS Flange Bolts

  • Load Distribution
  • Increased load-bearing capacity
  • Simplified Assembly
  • Cost-Effective
  • Reduced loosening
  • Enhanced Aesthetics

Eye Bolts Are Primarily Used for Light-duty Applications

It is mainly used for light-duty applications because heavy weight can affect the eye to open, or for pointed loads which could bend or even break the bolt.

It is considered as one of the most common type of bolt which has a simple structure, which includes of threaded shaft along with an eye at one of its end. It is inserted to structures such as wood or steel support which are usually been supported by a nut. It is fabricated to give a rope or cable sustenance throughout the ring in order to lift a material.

Components of an Eye Bolt

Part Purpose
Eye Hooks, ropes, and other attachments can be connected at this point.
Shank Transfers the load by inserting into or through a substance.
Threaded Portion provides a tight fitting of the eye bolt into a tapped or nut.
Head serves as a bearing surface to keep the eye bolt from escaping.
Shoulder Keeps the bolt from sinking too far and more evenly distributes the strain.
Nut secures the eye bolt in place, adding more security.

Eye bolt part

Various Types of Eye Bolts & Applications

Type of Eye Bolt Applications
Standard Eye Bolt construction, automotive, and marine applications.
Shoulder Eye Bolt used in lifting and rigging.
Heavy-Duty Eye Bolt Heavy lifting and industrial applications
Swivel Eye Bolt rigging and hanging equipment.
Marine Eye Bolt Marine environments and outdoor applications
Drop Forged Eye Bolt construction and industrial uses.
Lag Eye Bolt wooden structures or beams, often used in carpentry and woodworking.
Metric Eye Bolt metric measurements are required, common in international standards.
Safety Eye Bolt Critical safety applications ,such as in safety rigging.
Rigging Eye Bolt Used in lifting and hoisting operations
Refer T-head Bolts Standard and Threads

T-Head Bolts is also called as Hammer-Head Bolts. It is has special “T” shaped head which gives easy insertion of the bolt in the top part which manages it from revolving while the installing nut.

Complying with particular standard of T-Head Bolts will ensure that it has the desired sizes, strength and features to manage the deliberated weight and pressure on it. This stops the incidents of failure and accident and expensive repairs.

Dimensional Standards of T-Head Bolts

ITEM DESCRIPTION HEX SOCKET HEADSCREW/ALLEN BOLT
ITEM TYPE FULL THREAD HALF/PARTIAL THREADED
INCH SERIES ASME ASME B18.3
METRIC SERIES ASME ASME B18.3.1M
DIN/ISO ISO 4762
IS IS 2269

Tolerance Standards Concrete of T-Head Bolts

FEATURE THREAD FIT LENGTH THREAD LENGTH
ITEM TYPE FULL/HALF/PARTIAL THREAD FULL/HALF/PARTIAL THREAD HALF/PARTIAL THREAD
INCH SERIES ASME ASME B 1.1- Cl 2A ASME B 1.1- Cl 3A ASME B18.3 ASME B18.3
METRIC SERIES ASME ASME B 1.13M-6g – –
DIN/ISO ISO 724, ISO 965-1 – 6g DIN ISO 965-1 – 6g ISO 4762 ISO 4762
IS IS 4218 PART VI -6g IS 2269 IS 2269
J Anchor Bolts Are Widely Used to Secure Walls to Concrete

It comes in broad range of sizes, finishing and material to encounter various needs and desire for application. It is a remarkable type of fastener which are utilize to anchor structural parts to concrete, frequently utilize for manufacturing and durable applications. It is usually used with other fastener to assure firm and solid connections.

It is simple to install as compared to other anchoring process. It can be easily removed and replaced without affecting a lot to the neighbouring material, which let to rework within the application.

Types of J Bolt

  • Standard J Bolt
  • Heavy-Duty J Bolt
  • L-Shaped J Bolt
  • Corrosion-Resistant J Bolt
  • Anchor J Bolt
  • Threaded J Bolt
  • Lag J Bolt
  • Metric J Bolt
  • Custom J Bolt

Uses of J Anchor Bolts

j bolt uses

Application Uses
Construction stabilising structural structures by fastening columns, beams and posts to concrete foundations.
Structural Support bridges, buildings, and industrial frameworks.
Foundation Anchoring Anchoring fence posts, support beams, and vertical structures to foundations.
Industrial Applications Mounting machinery and securing heavy industrial components.
Marine Applications Anchoring docks, marine equipment
Outdoor and Landscaping Securing garden structures, outdoor furniture and fixtures.
Agricultural Uses securing irrigation systems

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