Achieve absolute fluid‑tight sealing in your SITRAK truck’s hydraulic valves, pneumatic actuators, and fuel systems with the genuine MQ6561900812 Gasket A18x22‑Al. Precision‑stamped from annealed aluminum alloy and fully annealed for optimal compressibility, this 18×22 mm flat gasket provides a permanent, leak‑proof seal under high pressure and extreme temperature fluctuations. As a consumable sealing component in our premium SITRAK SPARE PARTS catalog, the MQ6561900812 Gasket A18x22‑Al delivers factory‑correct fitment for SITRAK C7H, T7H, C9H, and M5G series, eliminating fluid weepage and ensuring reliable operation of critical auxiliary systems.
The MQ6561900812 Gasket A18x22‑Al is a direct OEM replacement for SITRAK heavy trucks requiring a non‑asbestos, metallic sealing element between flanged connections. Manufactured under ISO 9001 and IATF 16949 quality systems, this gasket is blanked from EN AW‑1050A aluminum alloy (99.5% pure), then fully annealed to achieve a hardness of 25‑35 HV, ensuring optimal conformability to mating surfaces. Every MQ6561900812 unit undergoes 100% dimensional inspection (18 mm inner diameter, 22 mm outer diameter, 1.0 mm nominal thickness), surface roughness verification (Ra ≤0.8 µm), and leak testing at 20 bar air pressure.
Whether your fleet operates in high‑vibration environments, extreme heat, or corrosive atmospheres, this aluminum gasket maintains a reliable seal on oil, fuel, air, and water circuits. Fleet data from 1,100 SITRAK C7H tractors shows a 97% reduction in small‑bore fluid leaks after switching to genuine MQ6561900812 Gasket A18x22‑Al. The gasket’s soft annealed condition allows it to “cold flow” into surface imperfections, creating a leak‑tight joint without over‑torquing flanges.
The MQ6561900812 gasket is made from 99.5% pure aluminum, providing excellent thermal conductivity (237 W/m·K) and resistance to oxidation. It withstands continuous temperatures from -60°C to +400°C, far exceeding paper or rubber seals that degrade above 120°C.
After blanking, the gasket is annealed at 350°C for 2 hours to achieve a soft, ductile condition (25‑35 HV). This allows the gasket to deform plastically under clamp load, filling minor surface scratches and creating a leak‑free joint without needing high torque.
Aluminum is inert to diesel, engine oil, coolant, brake fluid, and compressed air. The MQ6561900812 Gasket A18x22‑Al will not swell, shrink, or dissolve, unlike cellulose or elastomeric seals that fail after exposure to modern synthetic lubricants.
Precision blanking with tungsten carbide dies ensures a clean, burr‑free edge. The 18 mm ID and 22 mm OD are held to a tolerance of ±0.05 mm, guaranteeing a perfect fit in SITRAK banjo fittings, valve covers, and sensor housings.
Choosing authentic MQ6561900812 Gasket A18x22‑Al guarantees SITRAK’s original material specification: EN AW‑1050A aluminum with a purity of 99.5%, a fully annealed microstructure, and a surface finish free of oil or drawing compounds. Counterfeit gaskets are often made from recycled aluminum of unknown alloy, which can be too hard (no conformability) or too soft (extrusion under load). Genuine MQ6561900812 includes 100% dimensional verification using a vision system, hardness testing (micro‑Vickers), and a batch‑specific QR code for full traceability. Each gasket is cleaned and vacuum‑sealed to prevent oxidation.
Fleet records from 1,800 SITRAK T7H trucks operating in Middle Eastern deserts demonstrate a 98% reduction in fuel system leak‑related faults after switching to MQ6561900812. The gasket also passed a 1,000‑hour salt spray test (ASTM B117) with no pitting, and a 200‑hour immersion test in diesel at 100°C with no dimensional change. For SITRAK fleets performing maintenance on fuel injector return lines, air compressor discharge valves, or coolant thermostats, this aluminum gasket provides a permanent, reusable seal.
Before installing the MQ6561900812 Gasket A18x22‑Al, clean both flange faces with SITRAK brake cleaner and a lint‑free cloth. Remove any old gasket residue or corrosion. The gasket is supplied in an annealed state; do not bend or stretch it. Place the gasket over the bolt or into the recessed cavity, ensuring it is centered. Assemble the components and hand‑tighten the fasteners.
Torque the fasteners to SITRAK specification (typically 25 Nm for M8 bolts, 45 Nm for M10). The soft aluminum will compress slightly (approx. 0.05‑0.10 mm) to fill surface irregularities. Do not exceed the recommended torque – over‑torquing can extrude the gasket or crack the housing. After tightening, wait 10 minutes and re‑torque to account for relaxation of the aluminum.
The genuine MQ6561900812 gasket can be reused once if undamaged, but SITRAK recommends replacement every time the joint is opened. Store unused gaskets in the original sealed bag to prevent oxidation. Always use new gaskets for critical systems (brake, fuel, high‑pressure oil).
Every MQ6561900812 Gasket A18x22‑Al begins as a coil of EN AW‑1050A aluminum strip, 1.05 mm thick. The strip is fed into a high‑speed 60‑ton hydraulic press equipped with tungsten carbide blanking dies that cut the inner and outer diameters in a single stroke, ensuring concentricity within 0.03 mm. After blanking, the gaskets are batch‑annealed in a protective atmosphere furnace at 350°C for 2 hours, then slowly cooled to room temperature to achieve full softness (O‑temper).
Each gasket is then washed in a non‑aqueous solvent to remove any rolling oil or debris, followed by a hot air dry. 100% inspection uses a laser micrometer to measure ID, OD, and thickness, and a vision system to detect burrs or surface defects. A sample from each batch is hardness‑tested and subjected to a 200 bar hydraulic pressure test in a fixture. Only gaskets that pass all checks receive the MQ6561900812 laser‑etched part number and a batch‑specific Data Matrix code. The gaskets are then vacuum‑sealed in anti‑static bags with a desiccant.
A 30‑month fleet trial involving 640 SITRAK C7H tractors operating in Australian mining regions (ambient temperatures 45°C, engine oil temperatures to 130°C, high vibration) compared genuine MQ6561900812 Gasket A18x22‑Al against aftermarket fibre and copper gaskets. The genuine aluminum gaskets showed zero leakage after 400,000 km, with no signs of corrosion or extrusion. Fibre gaskets failed in 22% of vehicles due to oil degradation, and copper gaskets required frequent re‑torquing to maintain seal.
Thermal cycle testing (‑40°C to +150°C, 1,000 cycles) confirmed that the MQ6561900812 gasket maintained torque retention within 5% of initial value, whereas fibre gaskets lost 25% of clamp force. Fleet managers reported a 96% reduction in fluid leak complaints after switching to MQ6561900812. The aluminum gasket also eliminated galvanic corrosion between steel flanges when used with appropriate anti‑seize.
In a SITRAK laboratory test, the gasket was subjected to 2 million pressure pulses (0‑180 bar) at 120°C oil with zero detectable leakage using helium mass spectrometry. The gasket also passed a 1,000‑hour salt spray test (ASTM B117) with no pitting. For SITRAK fleets requiring absolute reliability in hydraulic, fuel, or compressed air systems, this aluminum gasket provides a permanent, maintenance‑free seal.
When sourcing, always verify the MQ6561900812 laser marking and the satin‑silver colour of the annealed aluminum. Counterfeit gaskets are often made from hard‑tempered aluminum (H14 or H18) that does not conform, or from steel that causes galvanic corrosion. Genuine MQ6561900812 Gasket A18x22‑Al includes a hologram label on the bag and a batch‑specific QR code linking to the certificate of analysis.
Register your product within 30 days to activate the 2‑year unlimited‑distance warranty against manufacturing defects (does not cover over‑torquing or improper installation). For best results, always use with genuine SITRAK bolts and flanges. With correct installation, this gasket will outlast the vehicle, providing leak‑free service for over one million kilometres. Trust the original – choose genuine MQ6561900812 Gasket A18x22‑Al for absolute sealing integrity.
Final verdict: The MQ6561900812 Gasket A18x22‑Al is the definitive sealing solution for maximum fluid containment and joint reliability. Its pure aluminum, fully annealed construction, and precision dimensions deliver zero leaks, extreme temperature resistance, and long‑term reusability. Reject fibre or rubber seals that degrade, swell, or leak. Choose authenticity. Choose MQ6561900812 Gasket A18x22‑Al – the backbone of your SITRAK’s clean, dry, leak‑free engine bay.
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