BT40 Side Lock Tool Holder

BT40 side lock tool holders for secure clamping of straight-shank tools. Select the bore diameter and effective length to match your machining setup.

Key configuration

Feature	Specification
Spindle taper	BT40
Holder type	Side lock, SLN series
Bore range P	16 / 20 / 25 / 32 / 40 / 42 mm
Effective length L	100 / 150 mm

Standard models

Product Model	L (mm)	L1 (mm)	Bore P (mm)
BT40-SLN16-100L	100	65	16
BT40-SLN20-100L	100	65	20
BT40-SLN20-150L	150	75	20
BT40-SLN25-100L	100	65	25
BT40-SLN25-150L	150	75	25
BT40-SLN32-100L	100	65	32
BT40-SLN32-150L	150	75	32
BT40-SLN40-100L	100	70	40
BT40-SLN40-150L	150	80	40
BT40-SLN42-100L	100	70	42
BT40-SLN42-150L	150	80	42

Note: The dimensions chart is also included below in Product Details. Contact BOFA to confirm compatible accessories before ordering.

BT Face Mill Arbor (FMB / FMA)

BT face mill arbors for mounting shell and face milling cutters. The range covers BT40 and BT50 tapers with common FMB mounting sizes.

Key configuration

Feature	Specification
Spindle taper	BT40 / BT50
Arbor mounting sizes	FMB22 / FMB27 / FMB32 / FMB40
BT40 length range	45 / 60 / 100 / 150 mm
BT50 length range	60 / 100 / 150 / 200 mm

Standard models

Product Model	Taper	Mounting Size	Length (mm)
BT40-FMB22-45	BT40	FMB22	45
BT40-FMB22-60	BT40	FMB22	60
BT40-FMB22-100	BT40	FMB22	100
BT40-FMB22-150	BT40	FMB22	150
BT40-FMB27-45	BT40	FMB27	45
BT40-FMB27-60	BT40	FMB27	60
BT40-FMB27-100	BT40	FMB27	100
BT40-FMB27-150	BT40	FMB27	150
BT50-FMB22-60	BT50	FMB22	60
BT50-FMB22-100	BT50	FMB22	100
BT50-FMB22-150	BT50	FMB22	150
BT50-FMB22-200	BT50	FMB22	200
BT50-FMB27-60	BT50	FMB27	60
BT50-FMB27-100	BT50	FMB27	100
BT50-FMB27-150	BT50	FMB27	150
BT50-FMB27-200	BT50	FMB27	200
BT50-FMB32-60	BT50	FMB32	60
BT50-FMB32-100	BT50	FMB32	100
BT50-FMB32-150	BT50	FMB32	150
BT50-FMB32-200	BT50	FMB32	200
BT50-FMB40-60	BT50	FMB40	60
BT50-FMB40-100	BT50	FMB40	100
BT50-FMB40-150	BT50	FMB40	150
BT50-FMB40-200	BT50	FMB40	200

BT ER Collet Chuck

BT ER collet chucks for flexible clamping of round-shank cutting tools. Choose the taper, ER collet series and length according to the required clamping range.

Configuration guide

Spindle Taper	ER Collet Series	Clamping Range (mm)	Typical Lengths (mm)
BT30	ER11 / ER16 / ER20 / ER25 / ER32	1-20	70 / 100
BT40	ER11 / ER16 / ER20 / ER25 / ER32 / ER40	1-26	70 / 100 / 150 / 200
BT50	ER16 / ER20 / ER25 / ER32 / ER40	3-26	100 / 150 / 200 / 250 / 300

Full specification chart

The complete model chart, including product model, clamping range, diameter, length, compatible ER collet and wrench, is included below in Product Details.

BT Strong Milling Chuck

BT strong milling chucks for rigid clamping of straight-shank tools. The series covers BT40 and BT50 tapers with multiple effective lengths and clamping ranges.

Key configuration

Feature	Specification
Spindle taper	BT40 / BT50
Chuck series	SC20 / SC25 / SC32 / SC42
Tool clamping range	3-36 mm depending on model
Effective length range	90-250 mm depending on model

Standard models and clamping range

Product Model	Available Clamping Diameters (mm)
BT40-SC20-90L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16
BT40-SC25-105L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20
BT40-SC32-105L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25
BT40-SC32-135L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25
BT40-SC32-150L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25
BT40-SC32-165L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25
BT50-SC32-105L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25
BT50-SC32-135L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25
BT50-SC32-150L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25
BT50-SC32-165L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25
BT50-SC32-200L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25
BT50-SC32-250L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25
BT50-SC42-115L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25 / 28 / 30 / 32 / 34 / 36
BT50-SC42-165L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25 / 28 / 30 / 32 / 34 / 36
BT50-SC42-200L	3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 25 / 28 / 30 / 32 / 34 / 36