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Bolts Fasteners

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  • Bolts Fasteners
  • Bolts Fasteners
  • Bolts Fasteners
  • Bolts Fasteners
  • Bolts Fasteners
  • Bolts Fasteners

›

Bolts Fasteners

● Zinc-Plated Steel: It is one of the popular and commonly used bolt materials for general purpose applications, usually indoor. Depending on the type of manufacturing, the color of the bolt may be bluish or yellowish tint. It is a low carbon steel with a Zinc coating that provides moderate corrosion resistance. They are very cheap to manufacture as well.
● Stainless Steel: One of the toughest bolt materials with very good corrosion resistance. As a result, stainless steel bolts are often used in industries, automobiles, ships (and other marine equipment) and outdoor objects in general. They are slightly expensive than the Zinc plated counterparts.
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Product  Description

The material used in the manufacturing of the bolts will determine its strength, applications, corrosion resistance etc. There are several materials of Bolts and some of the popular ones are:


1725069350688324507040546816.png

● Zinc-Plated Steel: It is one of the popular and commonly used bolt materials for general purpose applications, usually indoor. Depending on the type of manufacturing, the color of the bolt may be bluish or yellowish tint. It is a low carbon steel with a Zinc coating that provides moderate corrosion resistance. They are very cheap to manufacture as well.

● Stainless Steel: One of the toughest bolt materials with very good corrosion resistance. As a result, stainless steel bolts are often used in industries, automobiles, ships (and other marine equipment) and outdoor objects in general. They are slightly expensive than the Zinc plated counterparts.

● Chrome / Nickel Plated Steel: Although stainless steel already consists of chromium, additional Chrome and Nickel plating of steel further increases the corrosion resistance. The other benefit of this plating is the surface of the bolt looks very shiny, smooth and polished.

● Hot-dipped Galvanized Steel: In this type, the steel is coated with even thicker layer of Zinc for increased corrosion resistance and thus making them suitable for outdoor use. Even the nuts and washers must be of the galvanized type for proper coupling.

● Brass / Bronze: These types of bolts have a natural resistance to corrosion as they are alloys of copper. They are generally expensive than other bolt materials and as a result they are often used in arts and decorative pieces.

● Alloy Steel: The Alloy Steel contains additional elements other than iron and carbon such as manganese, nickel, chromium etc. The result is a bolt with very good strength, corrosion resistance and wear resistance. It is often black in color due to additional black oxide coating.

 

Common Types of Bolts

As Bolts and Nuts are one of the commonly used fasteners, there are different types of bolts for different types of applications. Some of the more common and popular types of bolts are:


1725069366688324574258458624.png


Product Parameters

Imperial Bolt Size Chart

Nominal Size

Bolt Diameter ‘D’

Across Flats ‘A’

Across Corners ‘B’

Head Height ‘C’

Thread Length ‘L’

Transition Length ‘Y’


Max (in)

Min (in)

Nominal (in)

Max (in)

Min (in)

Max (in)

Min (in)

Nominal (in)

Max (in)

Min (in)

≤6 in

>6 in

Max (in)

1/4

0.25

0.245

7/16

0.438

0.428

0.505

0.488

5/32

0.163

0.15

0.75

1

0.25

5/16

0.3125

0.3065

1/2

0.5

0.489

0.577

0.557

13/64

0.211

0.195

0.875

1.125

0.278

3/8

0.375

0.369

9/16

0.562

0.551

0.65

0.628

15/64

0.243

0.226

1

1.25

0.312

7/16

0.4375

0.4305

5/8

0.625

0.612

0.722

0.698

9/32

0.291

0.272

1.125

1.375

0.357

1/2

0.5

0.493

3/4

0.75

0.736

0.866

0.84

5/16

0.323

0.302

1.25

1.5

0.385

9/16

0.5625

0.5545

13/16

0.812

0.798

0.938

0.91

23/64

0.371

0.348

1.375

1.625

0.417

5/8

0.625

0.617

15/16

0.938

0.922

1.083

1.051

25/64

0.403

0.378

1.5

1.75

0.455

3/4

0.75

0.741

1-1/8

1.125

1.1

1.299

1.254

15/32

0.483

0.455

1.75

2

0.5

7/8

0.875

0.866

1-5/16

1.312

1.285

1.516

1.465

35/64

0.563

0.531

2

2.25

0.556

1

1

0.99

1-1/2

1.5

1.469

1.732

1.675

39/64

0.627

0.591

2.25

2.5

0.625

1-1/8

1.125

1.114

1-11/16

1.688

1.631

1.949

1.859

11/16

0.718

0.658

2.5

2.75

0.714

1-1/4

1.25

1.239

1-7/8

1.875

1.812

2.165

2.066

25/32

0.813

0.749

2.75

3

0.714

1-3/8

1.375

1.363

2-1/16

2.062

1.994

2.382

2.273

27/32

0.878

0.81

3

3.25

0.833

1-1/2

1.5

1.488

2-1/4

2.25

2.175

2.598

2.48

1-5/16

0.974

0.902

3.25

3.5

0.833

1-3/4

1.75

1.738

2-5/8

2.625

2.538

3.031

2.89

1-3/32

1.134

1.054

3.75

4

1

2

2

1.988

3

3

2.9

3.464

3.306

1-7/32

1.263

1.175

4.25

4.5

1.111

2-1/4

2.25

2.238

3-3/8

3.375

3.262

3.897

3.719

1-3/8

1.423

1.327

4.75

5

1.111

2-1/2

2.5

2.488

3-3/4

3.75

3.625

4.33

4.133

1-17/32

1.583

1.479

5.25

5.5

1.25

2-3/4

2.75

2.738

4-1/8

4.125

3.988

4.763

4.546

1-11/16

1.744

1.632

5.75

6

1.25

3

3

2.988

4-1/2

4.5

4.35

5.196

4.959

1-7/8

1.935

1.815

6.25

6.5

1.25


Thread Pitch

Bolt Size

Thread Pitch

(in)

Coarse

Fine

1/4

20

28

5/16

18

24

3/8

16

24

7/16

14

20

1/2

13

20

9/16

12

18

5/8

11

18

3/4

10

16

7/8

9

14

1

8

14

1-1/8

7

12

1-1/4

7

12

1-3/8

6

12

1-1/2

6

12

1-3/4

5

–

2

4-1/2

–

2-1/2

4

–

3

4

–


Bolts Fasteners.jpg


Metric Bolt Size Chart

In metric system, the bolts (and nuts) are usually referred using the letter ‘M’ followed by additional dimensions. For example, a common metric specification of a bolt is “M6-1.0 x 20”. Here,

● ‘M’ indicates the bolt uses metric threads

● ‘6’ indicates the nominal diameter of the bolt (at the shank or the threads)

● ‘1.0’ indicates the thread pitch of the bolt in millimeter

● ‘20’ indicates length of the bolt in millimeter

Size

Pitch

Across Flats ‘A’

Across Corners ‘B’

Head Height ‘C’

Bolt Diameter ‘D’


(mm)

Max (mm)

Min (mm)

Min (mm)

Max (mm)

Max (mm)

Min (mm)

M5

0.8

8

7.78

9.2

3.5

5

4.82

M6

1

10

9.78

11.5

4

6

5.82

M8

1.25

13

12.73

15

5.3

8

7.78

M10

1.5

16

15.73

18.4

6.4

10

9.78

M12

1.75

18

17.73

20.7

7.5

12

11.73

M14

2

21

20.67

24.2

8.8

14

13.73

M16

2

24

23.67

27.7

10

16

15.73

M18

2.5

27

26.67

31.2

11.5

18

17.73

M20

2.5

30

29.67

34.6

12.5

20

19.67

M22

2.5

34

33.38

39.3

14

22

21.67

M24

3

36

35.38

41.6

15

24

23.67

M27

3

41

40.38

47.3

16.7

27

26.67

M30

3.5

46

45

53.1

18.7

30

29.67

M33

3.5

50

49

57.7

20.5

33

32.61

M36

4

55

53.8

63.5

22.5

36

35.61


Thread Pitch

Size

Coarse (mm)

Fine (mm)

Super Fine (mm)

M2

0.4

–

–

M2.5

0.45

–

–

M3

0.5

–

–

M3.5

0.6

–

–

M4

0.7

–

–

M5

0.8

–

–

M6

1

0.75

–

M7

1

–

–

M8

1.25

1

–

M10

1.5

1.25

1

M12

1.75

1.5

1.25

M14

2

1.5

–

M16

2

1.5

–

M18

2.5

1.5

–

M20

2.5

1.5

–

M22

2.5

1.5

–

M24

3

2

–

M27

3

2

–

M30

3.5

2

–

M33

3.5

2

–

M36

4

3

–

M42

4.5

3

–

M48

5

3

–

M56

5.5

3

–


Full-Link Trust Service System

d255e59f0a6a8c9c861e955f7bad92b0d09c718d5748-knFqrk_fw1200

—— Guarantee services

Pre-sales Trust Services (Reducing Decision-Making Risks)

Free Samples: We provide free samples accompanied by material certificates, allowing customers to inspect the products before placing orders.

Virtual Factory Tour + Live Factory Inspection: We offer appointment-based virtual factory tours (covering production lines, laboratories and warehouses).

Customized Solutions: Based on customers' application scenarios, applicable standards, budgets and delivery schedules, we provide multiple sets of steel selection and cost comparison solutions, with clear marking of quality risk points and corresponding control measures.

—— Guarantee services

Pre-sales Trust Services (Reducing Decision-Making Risks)

Free Samples: We provide free samples accompanied by material certificates, allowing customers to inspect the products before placing orders.

Virtual Factory Tour + Live Factory Inspection: We offer appointment-based virtual factory tours (covering production lines, laboratories and warehouses).

Customized Solutions: Based on customers' application scenarios, applicable standards, budgets and delivery schedules, we provide multiple sets of steel selection and cost comparison solutions, with clear marking of quality risk points and corresponding control measures.

—— Guarantee services

In-sales Transparent Management (Full Process Traceability)

Production Live Streaming: For orders from large customers, we provide real-time live streaming and short videos of the production process, enabling customers to witness the quality control work on site.

Loading Supervision Service: We support loading supervision by customers themselves or third-party institutions, with photo and video records provided as evidence.

Logistics Visualization: We provide bills of lading, real-time logistics tracking information and estimated port arrival time, enabling customers to inquire about the logistics status at any time.

—— Guarantee services

In-sales Transparent Management (Full Process Traceability)

Production Live Streaming: For orders from large customers, we provide real-time live streaming and short videos of the production process, enabling customers to witness the quality control work on site.

Loading Supervision Service: We support loading supervision by customers themselves or third-party institutions, with photo and video records provided as evidence.

Logistics Visualization: We provide bills of lading, real-time logistics tracking information and estimated port arrival time, enabling customers to inquire about the logistics status at any time.

—— Guarantee services

After-sales Support Services (Building Long-Term Trust)

Technical Support: We offer professional guidance on steel application, recommendations for welding processes, diagnosis of quality problems, and provide free technical training (both online and offline).

Customer Profile Management: We establish exclusive service profiles for each customer, recording order details, quality inspection results, delivery information and after-sales records. We conduct regular follow-up visits and proactively remind customers of inventory status and new product launches.

—— Guarantee services

After-sales Support Services (Building Long-Term Trust)

Technical Support: We offer professional guidance on steel application, recommendations for welding processes, diagnosis of quality problems, and provide free technical training (both online and offline).

Customer Profile Management: We establish exclusive service profiles for each customer, recording order details, quality inspection results, delivery information and after-sales records. We conduct regular follow-up visits and proactively remind customers of inventory status and new product launches.

why choose us

Precision Manufacturing

Equipped with advanced production lines and a skilled workforce, we ensure high dimensional accuracy and consistent quality in every batch. Our 19 years of OEM/ODM experience enable us to handle complex custom requirements with precision and efficiency.

Material Science

We specialize in copper and aluminum materials, with in-depth knowledge of their properties and applications. From standard alloys to specialized compositions, we provide material solutions optimized for conductivity, strength, and corrosion resistance.

Quality Controll

Our manufacturing process is backed by rigorous quality inspections at every stage—from raw material selection to final packaging. We adhere to international standards to ensure reliable performance and long-term durability of all products.

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