Cylinder Head Flange Hex Socket Screws M3x16 for Speed 21 V-SPEC - OS79871162 O.S. Engine  [OS79871162]

Precision flange hexagon socket screws for engine heads

This 10-piece screw set is intended for cylinder head retention on engines identified by Speed 21 V-SPEC in the listing. Each flange hexagon socket head screw is M3x16 and supplied to replace worn or missing fasteners on compatible cylinder heads. The description keeps the focus on RC engine assembly and head maintenance rather than general hardware applications.

Fitting notes: confirm thread compatibility and clean the head and block faces before assembly, start each screw by hand to reduce risk of cross-threading, and tighten progressively to ensure the flange seats uniformly. Store spare screws when removing the head so you have replacements handy during maintenance or gasket service.

Maintenance impact: while the screws do not increase engine output, consistent torque and correct clamping are critical for preserving head sealing and preventing leaks that can destabilize engine running and tuning adjustments.