Kinematic Base, Magnetic, 76.2 mm Square, Metric

The BK Series of kinematic bases has magnetically coupled top and bottom plates, providing repeatability of less than 100 μrad. The M-BK-3A kinematic base has a 76.2 x 76.2 mm top and bottom plates. Kinematic bases allow you to mount, remove, and replace optical components with very high repeatability. These bases are especially timesaving in setups where optical elements must frequently be interchanged, or when reference elements must occasionally be inserted in an optical path. The M-BK-3A-T is an extra top plate that may be ordered separately.

Convenient Magnetic Coupling

BK-Series bases utilize four high-strength magnets to securely couple the top and bottom plates together. The magnetically-coupled plates are easy to release by simply tilting the mounted component. The edges are chamfered to reduce the risk of pinching your fingers when coupling the top and bottom plates.

Four high-strength magnets in the BK-3A couple the plates together.

Bolt Down Anywhere at Any Orientation

The BK-3A kinematic bases feature a freely rotating disk insert with an eccentric clearance slot. Permiting 0.72 in. of translation which covers at least half the diagonal distance of standard 1.0 in. (25 mm) mounting hole grids, this patented mounting method allows an optical component to blot down anywhere and at any orientation on our optical tables and breadboards.

Exceptional Repeatability

Three polished steel balls in the bottom plate register with a hardened cone, groove, and flat in the top plate so the two plates relocate precisely every time. These bases are especially time-saving in setups where optical elements must frequently be interchanged, or when reference elements must occasionally be inserted in an optical path.

Top and Bottom Interfacing Surfaces of BK-2A

Specifications

Technical Specs

Type
Kinematic Base
Height
25.4 mm
Base size
76.2 x 76.2 mm
Thread Type
M3 and M6

Material
Aluminum
Repeatability
<100 µrad

Type
Kinematic Base
Height
25.4 mm
Base size
76.2 x 76.2 mm
Thread Type
M3 and M6

Material
Aluminum
Repeatability
<100 µrad

Resources & Downloads

Drawings And Cad

BK-3A-S(194.4 kB, PDF)

Other

M-BK-3A RoHS Certificate(278.5 kB, PDF)
M-BK-3A_RoHS2021.pdf(681.8 kB, PDF)

Related Products

Frequently Purchased Together

Description	Compatibility	Price
M-BK-2AKinematic Base, Magnetic, 50.5 x 62.2 mm, Metric	METRIC	$134
M-BK-1AKinematic Base, Magnetic, 25 mm Square, Metric	METRIC	$117
M-BK-3A-TTop Plate, For M-BK-3A, Kinematic Base, Metric	METRIC	$149
M-BKL-4Kinematic Base, Locking, 88.9 x 101.6 mm, Metric	METRIC	$331
M-BKL-4-TTop Plate, For M-BKL-4, Kinematic Base, Metric	METRIC	$117
M-BC-6-PKLong Base Clamp Pack, Adjustable-Height, M6 Tapped Holes, Metric, Pack of 10	METRIC	$130
M-360-90Angle Bracket, 90°, 1/4-20 (M6) Slots, 25 mm Spacing	METRIC	$103

Similar

Description	Compatibility	Price
M-110Kinematic Magnetic Base, 90 lb. Holding Force, M6 Threads	METRIC	$271
M-BK-2AKinematic Base, Magnetic, 50.5 x 62.2 mm, Metric	METRIC	$134
BUP-2Universal Base, Freely Rotating Disk, Eccentric Clearance Slot	UNIVERSAL	$122
M-BK-1AKinematic Base, Magnetic, 25 mm Square, Metric	METRIC	$117
M-BKL-4Kinematic Base, Locking, 88.9 x 101.6 mm, Metric	METRIC	$331
M-LNS-1Optic Inserter Stage, M4 Thread	METRIC	$528

Compatible

Description	Compatibility	Price
M-BK-3A-TTop Plate, For M-BK-3A, Kinematic Base, Metric	METRIC	$149
M-SDS65Manual Linear Stage, 25 mm Travel, Ball Bearings, M6 Threads	METRIC	$803
M-423Linear Stage, High-Performance, Low-Profile, 25 mm, M6	METRIC	$348
M-BC-5Base Clamp, Adjustable-Height, Short, M6 Tapped Holes	METRIC	$13.10
M-UP-1AMounting Plate, Universal, 65 mm x 65 mm x 12.7 mm, M6 Thread, Metric	METRIC	$58