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Your Professional Internal Hex Bolts Manufacturer

 

Wuxi Lemar Metal Products Co., Ltd. is a professional fastener system service group integrating scientific research, manufacturing, sales and logistics. It follows the business philosophy of "striving for excellence and adhering to integrity" and has established a good image in the field of fastener manufacturing and sales. It has established long-term cooperative relationships with major well-known logistics brands at home and abroad to ensure that products are delivered to customers at the fastest speed and are well received by users.

 

 
  • 12.9 Socket Head Cap Screws
    12.9 Socket Head Cap Screws

    Name:High Tensile steel socket head cap crews. Model:M3~M24 Hexagon bolt partly thread. Finish:Black. Class:12.9.

  • Chamfered Hexagon Socket Screws
    Chamfered Hexagon Socket Screws

    Specification:Chamfered inner hexagon screws. No.:DIN 7991. Grade:8.8, 10.9,12.9. Size:M2-M20 Thread diameter*screw length.

  • DIN912 Hex Socket Bolts
    DIN912 Hex Socket Bolts

    Product name: DIN912 hex socket bolts. Bolt type:Hex socket head bolt. Head diameter:Customized from 1.4-100mm. Material:Class 12.9 steel.

  • Full Thread Socket Hex Bolts
    Full Thread Socket Hex Bolts

    Name: Full Thread socket hex bolts. Material:Steel/stainless steel. Grade:8.8/12.9. Surface finish:black bright/bright/galvanized.

 
Why Choose Us
 

Technical team support
Possess full process manufacturing capabilities and experimental research and development capabilities for fasteners. With strong technical strength and 3D marketing network, it has more than 100,000 enterprise-level users and serves 57 industries.

 

Production Equipment
Our company has cold heading machines, thread rolling machines, wire drawing machines, thread rolling machines, tapping machines, vibration plate automatic assembly and other processing and feeding equipment.

 

Sales Market
Lemar Assisting scientific research enterprises,exported to Europe,North America, Africa, Central Asia, Middle East.

 

Internal Hex Bolts - Overview

 

 

Internal hex bolts, also known as socket head cap screws, are threaded fasteners with a six-sided (hexagonal) indentation in the head, requiring an Allen wrench or socket for tightening or loosening. They are commonly used in applications where a low-profile, flush installation is desired.

 

Product Specification
 

We provide the Hex Head Shoulder Bolt specifications：

Shoulder size

D

A

H

D1

E

T

J

Max

Min

Max

Min

Max

Min

Thread

P

Max

Min

 

6

5.987

5.951

10

9.78

4.5

4.32

M5

0.8

9.75

2.4

3

8

7.987

7.951

13

12.73

5.5

5.32

M6

1

11.25

3.3

4

10

9.987

9.951

16

15.73

7

6.78

M8

1.25

13.25

4.2

5

12

11.984

11.941

18

17.73

8

7.78

M10

1.5

16.4

4.9

6

13

12.984

12.941

18

17.43

9

8.78

M10

1.5

16.4

4.9

6

16

15.984

15.941

24

23.67

11

10.73

M12

1.75

18.4

6.6

8

20

19.980

19.928

30

29.67

14

13.73

M16

2

22.4

8.8

10

25

24.980

24.928

36

35.61

16

15.73

M20

2.5

27.4

10

12

 

Stainless Steel Hex Socket Cap Bolt

 

Advantages of Internal Hex Bolts

☆Space Efficiency and Flush Mounting:
Internal hex bolts require less space than external hex bolts because the driving tool (an Allen wrench or hex key) is inserted into the head rather than gripping it from the outside.

 

☆Access in Confined Spaces:
The ability to use an Allen wrench allows for access to bolts in tight or recessed areas where a standard wrench might not fit.This is particularly helpful in machinery, electronics, and other applications where components are closely packed.

 

☆Reduced Risk of Stripping:
Internal hex bolts are generally less prone to stripping (rounding of the head) than external hex bolts, especially when tightened with an appropriate Allen wrench and proper torque.This is because the wrench engages a larger surface area within the hex socket, distributing the force more evenly.

 

☆Clean Aesthetic:
The flush-mounted nature of internal hex bolts contributes to a cleaner, more professional look, especially in applications where aesthetics are a consideration.

 

 

Materials of Internal Hex Bolts

★Popular hex bolt finishes include

  • Bright zinc-plated
  • Zinc hex bolt
  • Clear passivated
  • Black oxide
  • Plain

 

★Steel Hex Bolts
Steel is available in varying strengths and grades – typical standards for steel hex bolts include EN8 steel and EN16 steel. As a guideline, the higher the number, the stronger the steel.

 

★Stainless Steel Hex Bolts
Stainless steel is another popular choice for hex bolts thanks to its strong corrosion-resistant properties. Hex bolts made from stainless steel can be used in either internal or external applications, but zinc-plated steel is another common alternative well-suited to indoor uses.

 

★Brass Hex Bolts
You may also find hex bolts made from other materials like brass, but this is less common. Although brass provides a high level of resistance against corrosion, it is usually more expensive so is often overlooked in favour of steel.

Stainless Steel Hex Socket Cap Bolt

 

Application

 
 

Building Construction:​
Steel Structure Connections - Core structural elements. Used for joining primary and secondary steel beams and columns in bridges, factories, and high-rises, withstanding immense tensile and shear forces. High-strength bolts (e.g., Grade 8.8, 10.9) with corrosion protection like hot-dip galvanizing are standard.

 
 

Automotive Manufacturing:
Engine and Chassis Critical Connections - Securing engine blocks, transmissions, suspension systems, subframes, and wheel hubs. These connections require bolts capable of enduring extreme shock, vibration, and high temperatures, necessitating material strength ≥ Grade 8.8 with corrosion protection coatings such as Dacromet.

 
 

Machinery & Equipment:​
Assembly of Industrial Machinery - Essential for fixing housings, bases, bearing housings, and flanged connections in machine tools, gearboxes, pumps, valves, and transmission systems. Bolt selection varies based on application-specific load requirements, emphasizing reliability and maintenance accessibility.

 
 

Furniture Manufacturing:
Load-Bearing Joints & Fixtures - Applied in assembling wooden/panel furniture structures (e.g., table leg-to-top joints, bed frame reinforcement), mounting fixtures (towel racks, shelves), and securing appliances (washing machines). Typically uses Grade 4.8 partially threaded bolts with washers or flanges, balancing corrosion resistance (zinc plating/black oxide) with aesthe

 

 

Stainless Steel Hex Socket Cap Bolt

 

Customization Process

★Requirement Discussion: Contact us and provide your design drawings, size specifications, and other technical parameters.


★Design Proposal: Our professional team will develop a design proposal and provide a quotation based on your requirements.


★Sample Production: We produce samples according to the design proposal and conduct rigorous testing.


★Mass Production: Upon your approval, we commence mass production to ensure timely delivery and consistent quality.


★After-Sales Service: We offer ongoing technical support and service to ensure the long-term stable operation of our products.

 

 

Other Services
  • Surface treatment: Plain, Galvanized, Hot Dip Galvanized, Black Oxide, Anodized, etc.
  • Excellent quality control system for fine dimensional accuracy.
  • Various materials are available as per your request
  • Conform to international standard.
  • We had got certificate of ISO9001: 2008, SGS & RoHS.
  • Prompt delivery.
  • Various sizes are available.
  • Material: Stainless Steel 18-8 18-10, Carbon steel Gr4.8 Gr8.8 Gr10.9, Gr12.9, Aluminum, Copper, etc.
  • Packing Stylet: General export packing
  • Can be made with different standards such as ISO, DIN, AS/NZS, GB, ANSI, BS and special standard.
  • Good customer service
  • OEM is available
Stainless Steel Hex Socket Cap Bolt

 

Package & Delivery

 

Package: Standard export package
Delivery: By air express, by sea

 

productcate-1-1

 

FAQ

 

Q: Are hex bolts fully threaded?

A: Hex bolts are a type of threaded bolt, characterised by their six-sided hexagonal-shaped head. Hex bolts can be either fully threaded or partially threaded (featuring a clear shank along part of the body) and are suitable for use in a wide range of applications, typically machinery and construction.

Q: When to use hex bolts?

A: When to Use: Choose hex bolts when fastening metal components or requiring high load-bearing capabilities. Opt for lag bolts when fastening heavy wood components without the need for a nut.

Q: What is the difference between Allen bolts and hex bolts?

A: Hex bolts have a wider surface area, making them more prominent and easier to grip with a wrench or pliers. The wider surface area contributes to their strength when under heavy loads. On the other hand, Allen bolts are slender and can be easily torqued or adjusted using an Allen wrench in confined spaces.

Q: How do you install a hex bolt?

A: Hex bolts are installed by turning a nut to tighten the fastener. Hex cap screws are installed into tapped holes by turning the head to assemble and tighten. Hex bolts have neither the washer face nor chamfered point. Hex cap screws feature a washer face on the bearing surface and the chamfered point.

Q: Are you manufacturer or trading company?

A: We are manufacturer.

Q: What's your best delivery time?

A: Within 15-30 days.

Q: What is the quality control of your product?

A: Follow strictly quality control measures for implementation,

Q: Will your company provide free sample?

A: It depends on which sort of item you want to get. Some can be provided free of charge, however, the client shall assume the shipping fees himself.

Q: Is OEM open to clients?

A: Yes, we can provide both OEM and ODM service.

Q: How can our company be your distribution partner?

A: We welcome you to be our distributor. For further details, please contact us.

Q: What is the payment of sample?

A: T/T and Alipay both acceptable.

Q: What is your sample policy?

A: If we have stock, we can provide samples, but the customer must pay the sample fee and express fee Question.

Q: Have you tested all your goods before shipment?

A: Yes, we will conduct 100% test before delivery, and we will send detailed photos of parts for your approval Question.

We're well-known as one of the leading internal hex bolts manufacturers and suppliers in China. If you're going to wholesale high quality internal hex bolts made in China, welcome to get pricelist and free sample from our factory. Also, OEM service is available.

DIN912 Hex Socket Bolts, internal hex bolts, Stainless Steel Hex Socket Cap Bolt

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