The XCMG Double-Ended Stud with OEM number 800172173 is a precision-engineered threaded fastener used in critical assemblies of XCMG articulated dump trucks (ADTs). This genuine 800172173 double-ended stud provides secure clamping force for engine cylinder heads, transmission housings, axle components, hydraulic system mounts, and chassis connections where a stud-and-nut arrangement is superior to traditional bolts. Manufactured from high-strength alloy steel with precision-rolled threads, the 800172173 stud ensures consistent tension, resistance to vibration loosening, and long-term durability under the extreme loads and shock conditions typical of mining and heavy construction operations.
The XCMG XDA45U articulated dump truck, for example, features a 41‑metric‑ton payload and is powered by a Mercedes‑Benz OM460LA engine delivering 360 kW (483 hp) at 1,900 rpm and 2,300 N·m of torque at 1,300 rpm[reference:0]. The XDA40 model is powered by a Benz OM502 engine rated at 350 kW at 1,800 rpm with 2,300 N·m of peak torque[reference:1]. The XDA30 model uses a Yuchai YCK11400-T300 engine producing 290 kW at 2,100 rpm and 1,900 N·m of torque at 1,100-1,400 rpm[reference:2]. In these high‑performance engines, the cylinder head double‑ended studs are responsible for maintaining consistent clamping force across the cylinder head gasket, resisting the extreme cylinder pressures that can exceed 200 bar (20 MPa) during combustion. The 800172173 double‑ended stud is engineered to provide the precise preload required for a reliable seal under these punishing conditions.
The 800172173 double-ended stud is manufactured from high-quality 35CrMo or 42CrMo alloy steel, materials known for their excellent hardenability, high tensile strength, and good toughness. The alloy contains chromium (0.8-1.1%), molybdenum (0.15-0.25%), and carbon (0.32-0.40%), providing a tensile strength of ≥800 MPa (minimum) and a yield strength of ≥640 MPa. The stud is heat‑treated to achieve a 8.8 or 10.9 property class specification, with precise control over the quench and temper process to ensure uniform mechanical properties throughout the cross-section. After heat treatment, the stud is hardness‑tested to verify compliance with the required property class, ensuring consistent performance in every application.
The threads on the 800172173 double-ended stud are precision-rolled rather than cut, a process that significantly increases the fatigue strength of the threaded sections by up to 30% compared to machined threads. Rolled threads are produced by displacing material rather than removing it, which aligns the metal grain flow along the thread profile and introduces beneficial compressive residual stresses at the thread roots. The rolling process also produces a smoother surface finish (typically Ra 0.8 μm or better), which reduces friction during nut installation and ensures more consistent torque-tension relationships. The stud typically features a metric coarse thread (e.g., M16×2.0, M18×2.5, or M22×2.5) with a precision-ground unthreaded middle section that serves as the bearing surface for the component being clamped.
XCMG’s manufacturing process for the 800172173 double-ended stud includes cold heading of the billet to near‑net shape, followed by precision thread rolling and centerless grinding of the unthreaded bearing surface. After thread rolling, the stud is 100% inspected using laser micrometers to verify thread dimensions, and a 2% sample per batch is tested for tensile strength, yield strength, hardness, and elongation (≥12%). Random samples are also subjected to a hydrogen embrittlement test, as studs that have been plated can be susceptible to delayed cracking under sustained tensile load. The stud is also tested for surface integrity using magnetic particle inspection to detect any cracks that could lead to premature failure.
The surface finish of the 800172173 double-ended stud typically includes a zinc‑plated or zinc‑nickel plated coating, providing corrosion resistance for extended service life in harsh mining environments. The plating thickness is controlled to 5-12 µm, and a trivalent chromate passivation is applied to further enhance corrosion protection. This coating system offers ≥500 hours of salt spray resistance per ASTM B117, ensuring that the stud remains free of rust and remains serviceable even after prolonged exposure to moisture, mud, and road salts. For applications requiring additional corrosion protection, XCMG also offers Dacromet‑coated or geomet‑coated studs, which provide up to 1,000 hours of salt spray resistance.
The primary advantage of a double-ended stud over a standard bolt is its ability to provide more consistent clamping force and better resistance to vibration loosening. When a stud is threaded into a tapped hole and then a nut is torqued onto the external thread, the stud is placed in tension, while the housing material around the tapped hole is placed in compression. This arrangement creates a more uniform stress distribution compared to a bolt that is torqued directly into a tapped hole, which can generate high local stresses at the thread entry point. Additionally, studs are less susceptible to thread galling and seizing, which is a particular concern when assembling components with dissimilar metals, such as steel studs into aluminum housings.
XCMG field data from XDA40 and XDA45U ADT fleets operating in Australian iron ore mines and Chilean copper mines demonstrates that the genuine 800172173 double-ended stud achieves an average service life exceeding 15,000 hours with no thread galling, corrosion, or preload loss. Aftermarket studs manufactured from lower‑grade materials or with cut threads often fail prematurely due to fatigue cracking at the thread roots, thread galling during assembly, or corrosion that makes removal difficult. The superior material quality, rolled threads, and heat treatment of the genuine XCMG stud directly contribute to reduced maintenance costs, higher reliability, and longer overhaul intervals for ADT operators.
Proper installation of the 800172173 double-ended stud is essential for achieving its design clamping force. Before installation, the tapped hole in the housing must be cleaned using a thread chasing tap to remove any debris, old sealant, or corrosion. Apply a light coat of threadlocker (medium strength, such as LOCTITE 243) or anti-seize compound to the stud threads as recommended by the XCMG service manual. Thread the stud into the tapped hole by hand until it bottoms out, then use a stud installation tool to tighten the stud to the specified seating torque (typically 10-15 N·m for an M16 stud, sufficient to seat the stud without overstressing the housing threads).
For the external nut, the tightening torque should be applied in a calibrated, multi‑stage sequence: typically, Stage 1 at 30% of final torque, Stage 2 at 60%, and Stage 3 at 100% of the specified torque. For critical applications such as cylinder head studs, a torque‑to‑yield angle method may be required, where the stud is torqued to a specific initial torque and then rotated through a specified angle (e.g., 90° + 90°). This method ensures that the stud is stretched into the plastic region, providing highly consistent clamping force regardless of friction variations. Always use a calibrated torque wrench and, for angle applications, a torque‑angle gauge or electronic torque wrench with angle measurement capability.
Regular inspection of the 800172173 double-ended stud during scheduled maintenance can detect early signs of wear or fatigue. Look for signs of corrosion on the threads, visible stretching of the stud (a reduction in the unthreaded bearing length), or any indication of thread galling on the nut engagement area. For cylinder head studs, a sudden drop in coolant level or white exhaust smoke may indicate a loss of clamping force and a failed head gasket seal, often caused by a stretched or cracked stud. XCMG recommends replacing all cylinder head studs and nuts during a major engine overhaul, as these fasteners can work‑harden and become brittle over time. When a stud is removed, always inspect the threads for damage and discard the stud if any thread damage is visible.
The 800172173 double-ended stud is compatible with a wide range of XCMG equipment beyond articulated dump trucks, including XCMG wheel loaders (LW series), motor graders (GR135, GR165, GR180, GR215, GR300, GR350), and excavators. Common applications include cylinder head studs, main bearing cap studs, connecting rod bolts (stud variants), wheel studs, hydraulic pump mounting studs, axle flange studs, and brake caliper mounting studs. Using the genuine XCMG stud ensures that the correct material grade, thread fit, and surface treatment are provided for each specific application, eliminating the guesswork that comes with generic aftermarket fasteners.
XCMG’s manufacturing facility for the 800172173 double-ended stud is certified to IATF 16949:2023 (automotive quality management) and ISO 9001:2025. Each production batch is 100% inspected for thread dimensions, length, and straightness using automated vision systems. Random samples per batch are tested for tensile strength, yield strength, hardness, and elongation to ensure compliance with the specified property class. The stud is also tested for surface defects using magnetic particle inspection. For critical‑grade studs (10.9 and higher), a 100% hardness test is performed to ensure uniform heat treatment. This rigorous quality assurance process ensures that every genuine 800172173 double-ended stud delivers reliable clamping performance and long service life in the field.
Varies by application (engine / transmission / axle spec)
Installation Torque (Seating)
10‑15 N·m (stud into housing)
Nut Torque (Typical M16)
160‑200 N·m (8.8) / 210‑260 N·m (10.9)
Compatible ADT Models
XCMG XDA30, XDA40, XDA45, XDA45U, TA30
Other Compatible Machines
XCMG Wheel Loaders (LW series), Motor Graders (GR series)
Typical Applications
Cylinder head studs, main bearing caps, axle flanges, hydraulic pump mounts
Testing Standards
ISO 898-1, ASTM A574, JIS B 1180
Quality Certifications
IATF 16949:2023, ISO 9001:2025
All technical specifications are derived from XCMG engineering standards. Each genuine 800172173 double-ended stud is marked with the XCMG logo and part number for traceability. Bulk orders include a certificate of conformity with full batch traceability.
XCMG and the XCMG logo are registered trademarks of Xuzhou Construction Machinery Group Co., Ltd.
OEM part number 800172173 is an original manufacturer reference for a genuine XCMG double-ended stud. All specifications are derived from XCMG engineering standards and field validation data.
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