M12x1.25 Conical Seat Wheel Lug Bolts

Technical Parameters

Key Parameter Details

1. Bolt Diameter

The nominal diameter of M12x1.25 Conical Seat Wheel Lug Bolts is 12mm. As a common specification for passenger car wheel hub connections, the 12mm diameter strikes a balance between load-bearing capacity and installation space, providing stable clamping loads for most small and medium-sized cars.

2. Pitch

This product features a 1.25mm fine-pitch design. Compared to coarse threads, M12x1.25 Conical Seat Wheel Lug Bolts offer superior self-locking performance, effectively preventing the risk of loosening under high-frequency vibration conditions and significantly improving the fastening accuracy of the connection.

3. Bolt Length

The effective thread length of M12x1.25 Conical Seat Wheel Lug Bolts typically ranges from 20mm to 60mm. J&W Auto Part supports custom lengths to ensure a precise fit between the bolt end and the wheel flange, avoiding clamping force failure due to insufficient length or mechanical interference due to excessive length.

4. Strength Grade

We offer high-strength grades such as 10.9 and 12.9. Higher values indicate greater tensile and yield strength. M12x1.25 Conical Seat Wheel Lug Bolts undergo precision heat treatment to withstand heavy loads under extreme driving conditions, meeting the needs of vehicles ranging from civilian cars to high-performance modified vehicles.

5. Surface Treatment

To extend the service life of M12x1.25 Conical Seat Wheel Lug Bolts, we offer several coating options:

• Electrochrome/Zinc Plating: Provides a bright appearance and basic rust protection.
• Dacromet: Excellent corrosion resistance, suitable for salt spray environments.
• Phosphating: Enhances surface hardness and wear resistance, suitable for complex working conditions.

6. Material

J&W Auto Part uses high-quality alloy steel as its raw material. Compared to ordinary carbon steel, alloy steel has superior fatigue strength and toughness, ensuring that M12x1.25 Conical Seat Wheel Lug Bolts will not fracture or plastically deform under long-term cyclic loading.

FAQ

Q1: Can the cone angle of M12x1.25 Conical Seat Wheel Lug Bolts be customized?

A1: Our standard cone angle is currently 60°. We can customize M12x1.25 Conical Seat Wheel Lug Bolts with other cone angles according to the buyer's specific needs. Specific angle parameters and usage scenarios need to be provided in advance. Our technical team will conduct a feasibility assessment and provide a customized solution.

Q2: What are the salt spray test standards for the product? Are there differences in salt spray test durations for different surface treatments?

A2: Our salt spray test uses the Neutral Salt Spray Test Standard (NSS), with a test temperature of 35℃ and a salt water concentration of 5%. The salt spray test durations differ for different surface treatments: electroplating ≥ 48 hours, hot-dip galvanizing ≥ 96 hours, and phosphating ≥ 72 hours. We can adjust the surface treatment process to improve corrosion resistance according to the buyer's usage environment requirements.

Q3: How to choose the appropriate strength grade when purchasing Wheel Lug Bolts?

A3: The choice of strength grade depends on the usage scenario: For wheel hub connections in ordinary passenger cars, grade 8.8 is sufficient; for SUVs, light trucks, and other vehicles with heavy loads, grade 10.9 is recommended; for heavy vehicles, high-performance modified vehicles, and other high-pressure stress scenarios, grade 12.9 is recommended. Our technical team can provide professional selection advice based on the vehicle model and usage scenario provided by the buyer.

Q4: Are product samples provided? What is the sample delivery time?

A4: We can provide samples of Bolts. The sample quantity is determined according to the buyer's needs. Standard samples are provided free of charge (shipping costs are borne by the buyer). The sample delivery time is 3-5 working days, and the customized sample delivery time is 7-10 working days.

Q5: What is the minimum order quantity for bulk purchases? How is the delivery time calculated?

A5: The minimum order quantity for Wheel Lug Bolts is 1000 pieces. The larger the bulk order, the more competitive the price. Delivery time depends on the order quantity: 1000-10000 pieces, 7-10 business days; 10000-50000 pieces, 10-15 business days; over 50000 pieces, 15-20 business days. Specific delivery times can be negotiated based on order requirements.

Q6: Does the product support third-party testing?

A6: Yes. Our products undergo rigorous internal testing. We can also commission third-party testing agencies such as SGS and TUV to conduct testing upon request. Testing fees are determined based on the testing items and quantity. Test reports serve as proof of product quality, protecting the buyer's purchasing rights.