Grade 12.9 wheel bolt

Types of Grade 12.9 Wheel Bolt

Grade 12.9 wheel bolts are high-strength fasteners used to secure wheels in heavy-duty applications and critical load-bearing assemblies. These bolts are made from alloy steel and undergo heat treatment to achieve their high tensile strength.

• Hexagon Head Bolts

  These are the most common type of wheel bolts and have an hexagonal-shaped head that requires a wrench or socket for installation and removal. They come in a variety of lengths and thread sizes.

• Flange Bolts

  These bolts have a circular flange at the head that acts as a washer. It distributes the load over a larger area, reducing the risk of damage to the bolt or the material being fastened. Grade 12.9 flange bolts are commonly used in applications where space is limited, and a washer may not fit.

• Socket Cap Screws

  These are internal-wrenching hex bolts that require an Allen wrench for installation and removal. They have a cylindrical head with a hexagon-shaped recess on top. Grade 12.9 socket cap screws are typically used in applications that require high strength and where there is a need to avoid protruding bolt heads.

• Studs and Nuts

  Grade 12.9 wheel studs are a type of fastener that is installed into threaded holes on the wheel hub. The studs protrude from the wheel hub, and the wheels are mounted onto the studs using lug nuts. This type of fastener is commonly used in heavy-duty trucks and racing applications, where quick wheel changes and even load distribution are essential.

• Counter sunk bolts

  These bolts have a flat head with a countersink at the top. They are used to fasten parts with a countersunk hole where the head of the bolt sits below the surface. Grade 12.9 countersunk bolts improve aerodynamics in applications such as automotive and aerospace.

• Carriage bolts

  These bolts have a rounded head with a square section just below the head that locks into place when installed. Grade 12.9 carriage bolts are used in applications with wooden components, such as furniture manufacturing.

Specification and maintenance of Grade 12.9 wheel bolts

Manufactured under stringent international standards, Grade 12.9 wheel bolts have highly desirable mechanical features. They are strong and wear-resistant.

Here are some critical specifications of the bolts:

• Material

  The bolts are made of high-carbon alloy steel. This material is desirable for its strength and durability. Grade 12.9 bolts can withstand high-stress applications.

• Tensile Strength

  The bolts have a minimum tensile strength of 1200 MPa. This strength allows the bolts to resist heavy loads without breaking.

• Yield Strength

  The yield strength of these bolts is 1000 MPa. The bolts can be deformed or stretched without permanent damage.

• Hardness

  The bolts have a hardness level of 39 to 45 HRC. The grade 12.9 wheel bolts are harder and more wear-resistant.

• Surface Treatment

  The surface of the bolts is treated to prevent corrosion. For example, some bolts have a zinc-plated finish.

• Thread Pitch

  A bolt's thread pitch determines how tightly it will screw into a nut or hole. Grade 12.9 wheel bolts have a standard thread pitch.

Grade 12.9 wheel bolt maintenance is crucial for optimal performance and safety. Here are some maintenance practices for the bolts:

• Regular Inspection

  Users should frequently inspect the bolts for wear and corrosion. They should also check for signs of damage, such as cracked threads.

• Tightening

  It is essential to periodically check the tension of the wheel bolts. Loose bolts can cause vibrations that lead to more significant problems.

• Lubrication

  Regular lubrication helps to maintain the smooth operation of the bolts. Use the recommended lubricant for wheel bolts.

• Replacement

  At some point, wheel bolts will reach the end of their useful life. It is advisable to use original equipment manufacturer (OEM) bolts for replacement.

How to choose Grade 12.9 wheel bolt

When shopping for Grade 12.9 wheel bolts, businesses need to partner with reputable suppliers so that they can get quality products. Here are some things they need to consider when sourcing for these bolts.

• Quality:

  Find suppliers who provide high-quality Grade 12.9 bolts. The bolts should have high strength and durability to handle heavy loads and resist damage in tough situations.

• Size and Length:

  Depending on the needs of the customers, source a variety of Grade 12.9 wheel bolts with different sizes and lengths. This is because customers might need specific sizes to fit their wheel or car requirements.

• Thread Pitch:

  Different vehicles have varying thread pitches. Ensure to check the suppliers catalog for the thread pitch measurements of the bolts to avoid incompatibility issues.

• Finish:

  Inquire about the finish of the wheel bolts. Some come with anti-corrosion finishes such as zinc plating. This helps protect the bolts from damage by harsh environmental conditions.

• Torque Specifications:

  Different wheel bolts require different torque specifications. Source for bolts that are in line with the specific requirements of common car models in the region.

• Compatibility:

  Ensure the bolts are compatible with a wide range of vehicles. This will widen the target market and ensure customers get value for their money.

• Brand Reputation:

  Get suppliers with reputable brands. Such suppliers are committed to providing quality products to maintain their reputation.

• Certification:

  Get bolts that are certified by relevant authorities. The certification is a proof that the bolts meet the required industry standards.

• Cost:

  Consider the cost of the bolts. Different suppliers will have varying prices depending on the quality of the product they offer. Source for Grade 12.9 wheel bolts that are within the set budget while still providing quality.

• Supplier Reliability:

  Partner with a reliable supplier who will deliver the order on time. The supplier should also have a good after-sales service.

• Customer Reviews:

  Check for reviews from previous customers. This will give an insight of what to expect from the products and the services of the supplier.

How to DIY and Replace Grade 12.9 Wheel Bolt

Replacing grade 12.9 wheel bolts can be a complex task that requires a good understanding of vehicle mechanics. However, with the right tools and knowledge, it can be done. Here's a step-by-step guide on how to replace grade 12.9 wheel bolts.

Tools Required:

• Socket wrench or breaker bar
• Torque wrench
• Drift punch or bolt extractor
• Hammer
• New grade 12.9 wheel bolts
• Lubricant

Step-by-Step Guide:

• 1. Safety First: Ensure the vehicle is on a flat surface, and the parking brake is engaged. Wear safety glasses to protect the eyes from possible debris.
• 2. Loosen the Nuts: Use a socket wrench or breaker bar to loosen the wheel nut before lifting the vehicle. The standard practice is to loosen them slightly and then lift the car.
• 3. Lift the Vehicle: Use a hydraulic jack to lift the vehicle. Ensure the jack is placed on the manufacturer's recommended lift points.
• 4. Remove the Wheel: Once the vehicle is lifted and secured with jack stands, completely remove the wheel by taking off the loosened nuts.
• 5. Remove the Damaged Bolt: If the bolt is damaged or stripped, use a drift punch or bolt extractor and a hammer to remove it. Applying some lubricant to the bolt can help ease the extraction.
• 6. Insert the New Bolt: Carefully insert the new grade 12.9 wheel bolt. Ensure it aligns properly with the wheel hub threads to prevent cross-threading.
• 7. Tighten the Bolt: Use the socket wrench to tighten the bolt. Tighten it until it is flush with the wheel hub. Do not over-tighten, as this can cause damage to the wheel hub.
• 8. Recheck the Tightness: After replacing all the bolts, do a recheck to ensure even tightness. This will help maintain wheel balance and prevent bolt failure.
• 9. Lower the Vehicle: Once the replacement is complete, remove the jack stands and lower the vehicle using the hydraulic jack.

Q&A

Q1: What is the difference between Grade 12.9 bolts and other wheel bolt grades?

A1: The differences are in the strength and application of the bolts. Grade 12.9 bolts are among the highest strength steel bolts, making them ideal for heavy-duty applications like trucks and trailers. Other lower grades like 8.8 may not have the same strength and are therefore used in less demanding applications.

Q2: Are Grade 12.9 wheel bolts overkill for small cars?

A2: Grade 12.9 bolts are not overkill for small cars, although they may be more than necessary. These bolts will provide extra security and durability, especially if the vehicle is used for transporting goods or people. However, it may be excessive for sports cars that do light-duty operations.

Q3: Can Grade 12.9 wheel bolts be used in any vehicle?

A3: Yes, Grade 12.9 wheel bolts can be used in any vehicle. However, it is important to check the thread pitch and length to ensure compatibility with the wheel hub. This makes them versatile across different vehicles.

Q4: How are Grade 12.9 wheel bolts different from ordinary wheel bolts?

A4: The key difference between Grade 12.9 wheel bolts and ordinary bolts is the former's high tensile strength. Grade 12.9 bolts can handle heavy loads and stresses, making them suitable for critical applications. Ordinary bolts may not have this strength and are therefore used in less demanding applications.

Q5: What is the meaning of 12.9 in Grade 12.9 wheel bolts?

A5: The 12.9 in Grade 12.9 wheel bolts refers to the strength level of the bolt. The first number, 12, indicates that the bolt has a minimum tensile strength of 1200 MPa. The 9 indicates that the bolt has a minimum yield strength of 900 MPa.