Original SANY Heavy Duty Screw A210204000220 – Grade 10.9 Precision Fastener

Screw

Винт

Tornillo

The A210204000220 screw is a critical fastening element used in SANY engine housings, drivetrain brackets, and chassis components. According to the official SANY engine parts catalog, four units of A210204000220 are typically employed per engine assembly to secure damper systems and frame attachments against extreme vibration and cyclic loading.

Featuring metric thread M8×20 with a full thread length of 20 mm, this screw conforms to GB/T 70.1 dimensional standards (equivalent to ISO 4762 and DIN 912). The hexagon socket drive (Allen key) provides a positive, slip-resistant engagement that allows for precise torque control during assembly, reducing the risk of cam-out or stripping that commonly affects cross-recess drives in heavy-duty service.

Unlike lower-grade fasteners that suffer from hydrogen embrittlement or rapid corrosion, the A210204000220 undergoes rigorous surface treatment—typically a zinc-flake Dacromet or Geomet coating—delivering over 500 hours of salt spray resistance without red rust, as validated by ISO 9227 testing standards. This advanced coating also eliminates hydrogen embrittlement risk, a critical safety advantage for high-strength (10.9 grade) fasteners operating in wet or chemically aggressive environments.

Why A210204000220 Screw Outperforms Generic Fasteners

Technical Specifications – Screw A210204000220

Installation of the A210204000220 screw requires attention to torque accuracy. A calibrated torque wrench with a 6 mm hex (Allen) socket is essential. The recommended tightening range for an M8×20 class 10.9 screw in general machinery applications lies between 24 N·m and 32 N·m (dry threads). However, SANY-specific engineering guidelines recommend 25–30 N·m using light machine oil on the threads to achieve consistent friction factor (µ ≈ 0.12–0.15).

Over-torquing past 35 N·m may exceed the elastic limit of the fastener, leading to stress cracking. Under-torquing, on the other hand, can allow micro-movement between clamped components, accelerating fretting wear and eventual joint separation. For critical locations—such as the four screws used per engine assembly to fasten dampers—re-checking torque after an initial 10-hour warm-up cycle is advised to accommodate settling effects.

To maintain long-term reliability, the OEM specification also recommends using thread locking compound (e.g., medium-strength anaerobic adhesive) for high-risk suspension or driveline joints.

Common Applications of Screw A210204000220 in SANY Machinery

To verify authenticity, inspect the head of the A210204000220 screw for the material strength marking “10.9” and the SANY batch code laser etch. This screw is interchangeable with aftermarket part numbers such as GB/T 70.1 M8×20 10.9, ISO 4762 M8×20-10.9, and DIN 912 M8×20-10.9.

Only the genuine SANY A210204000220 includes full traceability and the exact coating thickness (8–12 µm) validated to survive 500 h of neutral salt spray (ISO 9227). For wet-brake and high-humidity applications, the Dacromet coating also provides superior crevice corrosion protection.

When replacing old fasteners, always install a new A210204000220 rather than reusing used screws, as cold working from previous tightening cycles reduces the effective clamp force by up to 30% due to micro-yielding of the thread flanks. SANY parts catalogs list this screw as a standard maintenance item—operators are encouraged to keep a stock of four to eight units per vehicle for regular service intervals.