Screw

This aftermarket screw is specified for the SYM Jet X 125I 125cc, compatible with 2021-2022 model years and matching OEM reference 93600-04010-04. While often treated as a generic fastener, the correct screw specification is critical for safe and reliable assembly of bodywork, electrical components, and non-structural covers.

The screw serves as a general-purpose fastener for applications where the clamp loads are moderate and the primary function is to retain covers, shields, and trim pieces rather than to resist significant mechanical loads. The thread design is optimized for self-tapping or machine-thread applications depending on the specific variant. For self-tapping screws used in plastic or thin metal panels, the thread features a sharp crest angle and tapered lead that cuts or forms mating threads during installation. For machine screws used in tapped holes, the thread conforms to standard metric profiles with class 6g tolerance for smooth engagement.

Manufactured from low-carbon steel (typically C15 or 1015) with a tensile strength of 400-500 MPa (property class 4.8), this screw provides adequate strength for its intended applications while remaining ductile enough to tolerate minor installation misalignment without snapping. The zinc plating provides 96 hours of salt spray resistance per ASTM B117, sufficient for interior and sheltered exterior applications. For screws exposed to direct road spray, additional corrosion protection such as wax coating or epoxy paint may be beneficial.

Technical specifications: size per OEM parts catalog; thread: metric coarse or self-tapping; property class 4.8; tensile strength >400 MPa; head type: pan, oval, or countersunk per application; drive type: Phillips, Pozidriv, or hexalobular; coating: zinc electroplate, clear chromate; temperature range -20°C to 80°C.

Application examples on the SYM Jet X 125I include: body panel attachment, electrical connector retention, air filter box assembly, fuel tank cover fastening, and various trim piece mounting. The screw is not suitable for structural applications such as engine mounts, brake caliper attachment, or steering components—always consult the OEM service manual to verify the correct fastener grade for each application.

During installation, use the correct driver bit to prevent cam-out damage to the screw head. Apply torque gradually and stop when the screw is snug—over-tightening can strip threads in soft materials like aluminum or plastic. For self-tapping screws, do not remove and reinstall more than three times, as the formed threads will deteriorate. Replace screws that show thread damage, head rounding, or corrosion that compromises structural integrity. When removing painted or powder-coated panels, place a rag under the screwdriver to prevent surface scratching.