416 is the most common “free-machining” martensitic grade using sulphur to produce sulphides

allowing easier chip-breaking during machining.

Approximate Composition - 12% Cr, 0.10% C, 0.25/0.35% S (Exact composition ranges vary between EN and ASTM standards).

This grade combines the following characteristics:

Basic corrosion resistance lower than grade 410 due to sulphur
Moderate strength and toughness
Excellent machinability index approximately 90 compared to 100 for free cutting mild steel
416 is the preferred free machining grade where higher strength than 303 is required.

It is essentially grade 410 (1.4006) with sulphur for free machining.

It is ideal for high throughput, intricate components.

Applications include:

Shafts, axles, gears, valves, fasteners, golf club heads, sensors, precision machined components,

gun barrels, washing machine parts, dowel pins, clamps, collars.