6.8/8.8/10.9 Grade Center Bolts for Leaf Spring Customized Sizes Available Heavy Duty Truck Auto Parts Aftermarket Factory Wholesale High Quality Fasteners

• Customization: Available
• Material: 45#/40cr
• Type: Round Head
• Model NO.: jq42
• Standard: ISO9001 / IATF16949
• Grade: 8.8
• Application: Machinery, Chemical Industry, Environmental, Building
• Finish: Black
• Product Name: Center Bolts
• Materials: 40cr/35CrMo
• Surface Finish: Grey, Black, Silver, Golden
• Seat Type: Radius Seat (R4 / R5) / Cone Seat 90° / Ball Seat
• Certification: ISO9001 / IATF16949
• Service: OEM, ODM Accepted
• Transport Package: Box
• Specification: M10-20mm
• Trademark: Jin Qiang
• Origin: China Quanzhou
• HS Code: 7318151001
• Production Capacity: 50000PCS/Year
• Package Size: 40.00cm * 25.00cm * 15.00cm
• Package Gross Weight: 20.000kg
• Lead Time: 40 days (1 - 3000 Sets) ; To be negotiated ( > 3000 Sets)

Product Description

Product Description

 Center Bolt

The central bolt is a core fastening component for the commercial vehicle suspension system. It is used to clamp the steel spring plates, position and center them, prevent inter-layer misalignment, withstand heavy loads, impacts and high-frequency vibrations, ensuring the stability of the suspension and driving safety. It is widely applicable to steel spring suspension systems of light trucks, heavy trucks, trailers, buses, etc.

Core advantage

1.High-strength bearing: Selected alloy structural steel, with high tensile strength, capable of withstanding shear and fracture, and maintaining performance under heavy loads
2.Precise positioning: Reliable head positioning, full-sized thread profile, and high assembly concentricity
3. Anti-seismic and anti-loosening: Thread accuracy meets standards, with locking nuts for long-term vibration resistance without loosening

4.Corrosion-resistant and durable: Multi-layer surface protection, resistant to rust and corrosion, suitable for complex road conditions and environments

5.Complete specifications: Customizable for both Chinese and American standards, and without worries for replacing original factory parts

Parameter	Specification	Details / Notes
Product Name	Center Bolt	Also known as Axle Bolt
Applicable Series	Truck suspension	Compatible with BENZ Actros, Atego, Axor, etc.
Material Grade	Alloy Steel	40Cr/35CrMo/ 42CrMo4
Strength Class	10.9/12.9	High tensile strength for heavy loads
Thread Diameter	M12 – M30	Custom sizes available upon request
Length (Center)	80mm –450mm	Varies by leaf spring pack thickness
Thread Pitch	Fine / Coarse	As per OEM specifications (e.g., 1.5mm, 2.0mm)
Surface Finish	Phosphate/Zinc Plated/Dacromet	Anti-corrosion coatings for durability
Head Type	Hex / Round / Square	Standard hex head or custom design
Bend Type	Semi-Round / Square Bend	Precision bent to match axle seat
Hardness (HRC)	32 – 39 HRC	Consistent through heat treatment
Yield Strength (Min)	900 MPa (for 10.9) / 1080 MPa (for 12.9)	Ensures no permanent deformation
Tensile Strength (Min)	1040 MPa (for 10.9) / 1220 MPa (for 12.9)	High resistance to breaking under tension
Elongation (Min)	9% (for 10.9) / 8% (for 12.9)	Ensures ductility before fracture
Packaging	Carton + Pallet / Waterproof Paper / Custom	Standard export packaging
MOQ (Minimum Order Quantity)	3000 pcs	Sample orders negotiable

Main Products

Company Profile

FUJIAN JINQIANG MACHINERY MANUFACTURE CO., LTD. was founded in 1998 and is located in Quanzhou City, Fujian Province. As a high-tech enterprise, JinQiang provides one-stop services including manufacturing, processing, transportation, and exporting of wheel bolts, nuts, centerbolts, U-bolts, spring pins, and other products.

With over 20 years of professional production experience and a strong technical team, the company has obtained IATF 16949 quality management system certification. It consistently adheres to the implementation of the GB/T 3091.1-2000 automotive standard. The company's products have been exported to more than 50 countries and regions, including Europe, America, Southeast Asia, the Middle East, and Africa.

We always and will keep stick to our core value "Quality, Service, Excellence and Innovation". Jinqiang is very grateful to the trust from current customers whether they are domestic or oversea. We will keep innovating our products and providing excellent service toward all our clients. Also, we keep showing up in all kinds of exhibitions of auto parts and industrial machinery. Welcome new friends to visit us, we sincerely look forward to explore further cooperation with you.

Company Advantages

Certifications

Exhibition

Packaging & Shipping

FAQ

Q1: Can you offer price list?

A1: We can offer all parts which we handing brands, as the price is fluctuating frequently,

please send us detailed inquiry with parts number, photo and estimated unit order

quantity, we will offer the best price for you.

 

Q2: What's the MOQ?

A2: Usually MOQ is according to different products, 5-10pcs/model for stock items.

 

Q3: What's the delivery time?

A3: It takes 5-7 days if there is stock, but takes 30-45 days if there is no stock.

 

Q4: What's the packaging?

A4: Neutral packing or customer make packing

 

Q5: What's the payment term?

A5: Air order: 100% T/T in advance;

Sea Order: 30% T/T in advance, 70% balance before shipping.