O.S. Engine OS79871162 flange hexagon socket head screw M3x16 for cylinder head, pack of 10 pcs  [OS79871162]

Flange hexagon socket screws for RC engines

This is an RC-scale fastening set intended for cylinder head retention on engines identified with Speed 21 V-SPEC in the product name. The kit contains 10 pcs of flange hexagon socket head screws in M3x16 size, supplied to replace or service fasteners used on compatible cylinder heads. The description sticks to the part role, confirming these fasteners are for RC engine assembly tasks rather than general-purpose or non-RC applications.

Installation notes: confirm thread engagement and clean mating surfaces before fitting, hand-start each screw to avoid cross-threading, and tighten progressively to ensure even head seating on the flange. For maintenance and tuning, keep spare screws on hand during head removal and reassembly to avoid lost or damaged fasteners when working on compression, head shimming, or gasket changes.

Tuning role: while these screws do not change engine performance, correct torque and even clamping help maintain consistent head sealing and prevent leaks that can affect engine behaviour during tuning sessions and track use.