BT40 Hydraulic Expansion Chuck (FCC-AD+B) (JD/JF)

K101026291402304 article numbers

High Clamping Force
Runout ≤ 0.003 mm

A hydraulic expansion chuck that clamps the shank with a uniform oil film. One hex screw sets the pressure, and the film damps chatter that a rigid holder would pass straight into the cutting edge.

Type of Product: Hydraulic Expansion Chuck
Interface: BT (MAS 403)
Shank & Holder: BT40

Description

A hydraulic expansion chuck that clamps the shank with a uniform oil film. One hex screw sets the pressure, and the film damps chatter that a rigid holder would pass straight into the cutting edge.

Quality assurance

High Clamping Force

Runout ≤ 0.003 mm
Excellent Damping
Balanced G2.5 @ 25,000 rpm
Made to Order

Features

Runout under 0.003 mm at 2.5× diameter, repeatable over the tool life
Clamps and releases with a single hex key — no heating, no external equipment
Oil film raises tool life by up to 30% in reaming and finish milling
Reduction sleeves take the clamping range down without loss of accuracy

Technical specifications

Availability
Type of Product	Hydraulic Expansion Chuck
Interface	BT (MAS 403)
Shank & Holder	BT40
Clamping Ø	Ø12, Ø20, 1/2", 3/4"
Execution	FCC (face coolant), AD+B, JD, JF
Standard	DIN ISO 7388-2 / JIS B 6339
Coolant Supply	Face through coolant (FCC)
Balancing Grade	G2.5 @ 25,000 rpm

Dimension table

4 article nos.

4 article numbers

Item name	dmm	D1mm	G	Lmm	L1mm	Weightkg
BT40 HC12S 058 FCC AD+B 2.5G 25000 SL	12	42	M10	58	40	1.366
BT40 HC20S 72.5 FCC AD+B 2.5G 25000 SL	20	50	M16	72.5	42	1.572
BT40 HC1/2''S 058 FCC AD+B/2.5G 25000 SL	1/2"	42	M10	58	40	—
BT40 HC3/4''S 72.5 FCC AD+B/2.5G 25000 SL	3/4"	50	M16	72.5	42	—

Need a modified version? We build to print.

Special gauge lengths, clamping diameters and interfaces — engineered and manufactured in-house at Pune.