Heavy‑Duty Caliper Bolt M16 Long – OEM ZQ210B1690TF2 for Sitrak C7H Max

🔩 Genuine Sinotruk Sitrak parts — The ZQ210B1690TF2 Caliper Bolt M16 Long is a high‑strength fastener specifically engineered for the disc brake calipers of SINOTRUK Sitrak C7H Max heavy trucks. This ZQ210B1690TF2 bolt secures the caliper to the anchor bracket, withstanding extreme braking forces and thermal cycling. Designed to original equipment specifications, it guarantees perfect fitment and reliable clamping under the most demanding road conditions.

The ZQ210B1690TF2 Caliper Bolt M16 Long is a critical safety component in the brake system of SINOTRUK Sitrak C7H Max heavy trucks. It fastens the floating caliper to the caliper carrier, withstanding shear forces generated during high‑torque braking events. Manufactured from chrome‑molybdenum steel and heat‑treated to property class 12.9, this bolt provides tensile strength exceeding 1220 MPa and yield strength of 1100 MPa, ensuring no permanent deformation even under repeated emergency stops.

Each ZQ210B1690TF2 bolt features a precision‑rolled M16×1.5 thread with a 90‑mm length under head, matched to the original Sitrak C7H Max caliper bracket. The hex head (24 mm) includes an integrated flange to distribute clamping load evenly. The bolt is coated with a zinc‑nickel finish (480 hours salt spray resistance) to prevent corrosion in harsh environments, preserving thread integrity for future servicing.

Using the correct OEM ZQ210B1690TF2 bolt is essential because aftermarket bolts often have incorrect shank diameter or thread length, leading to improper clamp load or interference with the caliper slide. Genuine parts guarantee that the caliper aligns perfectly with the brake disc, preventing uneven pad wear and reducing the risk of brake fade. For fleets operating Sitrak C7H Max, this bolt is a must‑have for any caliper service or replacement.

The ZQ210B1690TF2 Caliper Bolt M16 Long is the original fastener for the front and rear disc brake calipers on SINOTRUK Sitrak C7H Max 6×4 and 8×4 chassis. It is also used on C7H Max tractor units with high‑performance braking systems. The bolt fits caliper models with a 90‑mm mounting distance and M16×1.5 thread, including those supplied by WABCO and KNORR‑BREMSE for Sitrak applications.

This part is interchangeable with earlier Sitrak C7H (pre‑Max) and T7H calipers that use the same mounting geometry, but always verify the original bolt length. The ZQ210B1690TF2 is distinguished by its 90‑mm length (under head) and the 20‑mm shoulder that centers the caliper. For trucks with extended service intervals, this bolt ensures that the caliper remains firmly attached even after 1.2 million brake applications.

When replacing calipers due to wear or after an accident, use a full set of ZQ210B1690TF2 bolts (two per caliper). Mixing old and new bolts can cause uneven clamp load and premature caliper movement. Keep a supply of these bolts in your fleet inventory to avoid delays during brake overhauls.

* All dimensions conform to SINOTRUK drawing ZQ210B1690TF2. Always use a calibrated torque wrench and replace bolts after removal.

To install the ZQ210B1690TF2 caliper bolt, first clean the mounting hole in the caliper bracket with a M16×1.5 thread chaser. Remove any old threadlocker or corrosion. Apply a light coat of anti‑seize compound to the shank (not the threads) to ease future removal. Insert the bolt and tighten by hand until the flange contacts the caliper. Using a torque wrench, tighten to 300 Nm in two stages: 200 Nm then final 300 Nm.

Because the ZQ210B1690TF2 bolt undergoes plastic deformation during tightening, it must be discarded after each use. Reusing a stretched bolt reduces clamp force by up to 40%, risking caliper movement and brake judder. Always use new bolts from sealed packaging to ensure the factory applied dry film lubricant is intact. After installation, verify that the caliper slides freely on the guide pins before mounting the wheel.

Regular inspection: during brake pad changes, examine the bolt heads for corrosion or damage. If any ZQ210B1690TF2 bolt shows rust streaks or if the hex edges are rounded, replace it immediately. For trucks operating in severe environments (salt, mining), consider replacing caliper bolts every two years regardless of mileage to prevent seizing. Keep a torque record for each wheel end to track maintenance history.

Counterfeit caliper bolts are a dangerous risk. Many use low‑grade 10.9 steel with rolled threads that are not stress‑relieved, leading to fatigue failure after thousands of braking cycles. Genuine ZQ210B1690TF2 bolts undergo 100% magnetic particle inspection and are batch‑tested to verify tensile strength. The unique head marking (SINOTRUK logo) allows easy identification.

The zinc‑nickel coating on OEM bolts is far superior to simple zinc plating. It resists galvanic corrosion between the steel bolt and the aluminum caliper carrier, a common failure point on older trucks. By using ZQ210B1690TF2, you avoid seized bolts that require drilling and tapping, saving hours of labor and preventing downtime.

For fleet managers, standardizing on genuine ZQ210B1690TF2 bolts reduces liability and ensures consistent brake performance. The cost of a single brake failure due to a substandard bolt far outweighs the price of a genuine part. Stock these bolts in your parts room and always train technicians to replace them during caliper service.

The ZQ210B1690TF2 Caliper Bolt M16 Long is a small component with a huge responsibility. It keeps your Sitrak C7H Max’s disc brake calipers securely attached, ensuring consistent stopping power in all conditions. Choose genuine SINOTRUK Sitrak parts for uncompromised safety, durability, and peace of mind. Don’t gamble with aftermarket fasteners – secure your fleet with the OEM standard.

SINOTRUK and Sitrak are registered trademarks of China National Heavy Duty Truck Group. Specifications reference OEM part ZQ210B1690TF2.