S40 / S50 Pneumatic Engraving Grinder — hero shot

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S40 · S50 Engraving Series ISO 11148-7 (pneumatic grinders)

S40 / S50 Pneumatic Engraving Grinder

Name: S40 / S50 Pneumatic Engraving Grinder
Brand: Kedes Machine
SKU: S40 · S50 Engraving Series

Precision small-tool pneumatic engraving and detail grinder for mold work, die polish and intricate finishing. Ultra-high spindle speed (20,000+ rpm) matches the small tool diameters used for engraving and inside-cavity detail. S40 standard / S50 high-power variants cover the typical mold-shop range.

Free speed

16,000 – 22,000 r/min

Power

0.21 – 0.51 kW

Reach

Standard to 2050 mm extension

Tool diameter

Small (engraving / detail)

TYPICAL REPLY · 1 WORKING SHIFT (GMT+8)

01 Model Comparison

Pick your size — 2 models in the series.

	S40 Series Standard power · ~20,000 – 22,000 rpm · 6.35 mm hose	S50 Series High power · ~16,000 – 18,000 rpm · 8 mm hose required
Free speed	~20,000 – 22,000 r/min	~16,000 – 18,000 r/min
Rated power	0.21 – 0.28 kW	0.34 – 0.51 kW
Air consumption	10 – 12 L/s	12 – 18 L/s
Hose I.D. required	6.35 mm	8 mm
Max weight	~0.5 – 2.0 kg	~1.1 – 5.0 kg
Shaft length	Std to 490 mm	Std to 2050 mm
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03 Key Features

Built for the job site.

// 01

Ultra-high speed — fine tool linear speed

20,000+ rpm matches the small carbide-burr and stone diameters used for engraving and detail work. Tool linear speed stays in optimal Vc range despite the small diameter.

// 02

Spark-free pneumatic — safe for moulds in shop

Mould-shop fires from electric grinder sparks igniting polishing wax and solvent are a documented hazard. Pneumatic eliminates the ignition source.

// 03

Extended shaft variants (S50)

Up to 2050 mm shaft reaches inside deep mould cavities, bore-hole interiors and long pipe runs where rigid-body grinders cannot enter.

// 04

Small footprint — overhead and detail work

Under 1 kg on the lightest variants. Fatigue-free for the precision detail work that defines the engraving and mould-finish workflow.

04 Industry Applications

Where this series earns its keep.

Mould & die polishing

Internal mould cavity finishing on stamping, injection and forging dies — extended-shaft S50 variants for deep-cavity detail.

See mould & die polishing solutions

Hazardous-area detail grinding

Internal weld and surface detail inside refinery and petrochemical hazardous-area pipework where spark-free operation is mandatory.

See hazardous-area detail grinding solutions

Casting & precision-part finish

Detail trim and finishing on precision castings and forged parts — burr removal, runner cleanup, deep-pocket polish.

See casting & precision-part finish solutions

06 FAQ

Common questions about the S40 · S50 Engraving Series.

Can't find your answer?

S40/S50 vs full S Series die grinder?

S40/S50 is the engraving-and-detail sub-range — small tool diameters, ultra-high RPM. Full S Series adds higher-power variants (up to S200 at 1.7 kW, 4,900 rpm) for heavy stock removal that engraving tools cannot handle. Mould shops typically own both — S40/S50 for finish detail, full S range for rough work.

Why does S50 need an 8 mm air hose?

Higher power consumption (12 – 18 L/s) requires the larger I.D. to maintain supply pressure under load. A 6.35 mm hose throttles the tool below rated speed. Shop air systems should plumb in larger I.D. for the S50 work-stations from the start.

07 Related Series