Sumitomo General Catalog 2025-2026

Strong MultiDrills HY Series

■ General Features Strong MultiDrill HY Type is a 3-flute drill that achieves stability and high efficiency in machining of steel and cast iron, reducing the load on each flute and extending the tool life.

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■  Features and Applications ● High-Efficiency Drilling of Steel and Cast Iron Thick web and 3-point margin design ensures stable hole diameter accuracy in high-efficiency drilling. RY THINNING also reduces cutting force in high-efficiency drilling. Applicable to cutting conditions exceeding v f =31.5 IPM in steel drilling and v f =39.4 IPM in cast iron drilling. (for ø10mm sizes) ● Long Tool Life DEX Coat for drills utilizes nano-coating technology to provide more than double the tool life of conventional coatings. 3-point margin design gives excellent guide performance for vibration control and long, stable tool life.

Evacuation Drastically improved chip control and evacuation

High Rigidity Retains high rigidity with a wide land.

Improves chip evacuation

Reduces cutting vibration

■ Product Range Coolant Supply

Ɣ Drilling of general steel and gray cast iron

Diameter Range (mm)

.008 .016 0 .024 .032

Cat. No.

Hole Depth (L/D) Number of items

MDW □□□□ HY3

23 items in stock

up to 3

MDW □□□□ HY5

Internal

ø5.0 to ø16.0

up to 5

23 items in stock

MDW □□□□ HY8

.08 .16

.24 .32

.40

.48 .56 .64

up to 8

6 items in stock

Diameter (inch)

■ Application Examples Machine components Alloy Steel ·Tool:  MDW 1250HY3 (ø12.5mm 3D) ·Cutting Conditions: Conventional Tool : v c =295 SFM, f =0.01 IPR, v f =22.6 IPM HY Type : v c =230 SFM, f =0.0157 IPR, v f =28 IPM H =12mm (through), internal coolant supply (water soluble) Machine components Ductile Cast Iron ·Tool:  MDW 1020HY3 (ø10.2mm 3D) ·Cutting Conditions: Conventional Tool : v c =230 SFM, f =0.011 IPR, v f = 24 IPM HY Type : v c = 262 SFM, f =0.024 IPR, v f =59 IPM H =28mm (stop), internal coolant supply (water soluble) 1.25 times the efficiency and 2.7 times the tool life of conventional drills 2.5 times the efficiency and +1.4 times the tool life of conventional drills (1.2 times the tool life of competitors' high-efficiency drills) HY Wear 2800 holes

HY

1900 holes

Wear

2300 holes

Competitor's High-Efficiency Drill

Wear

700 holes

Conventional drill

Wear

2000 holes

Conventional drill

Wear

(No. of Workpieces)

(No. of Workpieces)

0

1,000

2,000

0

1,000

2,000

3,000

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