Kinematic Base, Magnetic, 3 inch Square

The BK Series of kinematic bases has magnetically coupled top and bottom plates, providing repeatability of less than 100 μrad. The BK-3A kinematic base has a 3.0 x 3.0 inch 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 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
6-32 and 1/4-20

Material
Aluminum
Repeatability
<100 µrad

Type
Kinematic Base
Height
25.4 mm
Base size
76.2 x 76.2 mm
Thread Type
6-32 and 1/4-20

Material
Aluminum
Repeatability
<100 µrad

Resources & Downloads

Drawings And Cad

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

Other

BK-3A RoHS Certificate(278.3 kB, PDF)
BK-3A_RoHS2021.pdf(681.5 kB, PDF)

Related Products

Frequently Purchased Together

Description	Compatibility	Price
BK-3A-BBottom Plate, For (M-)BK-3A Kinematic Base	UNIVERSAL	$179
SP-2Optical Post, 2.0 in. Height, 0.5 in. Diameter, 8-32 and 1/4-20 Thread	IMPERIAL	$6.20
SP-3Optical Post, 3.0 in. Height, 0.5 in. Diameter, 8-32 and 1/4-20 Thread	IMPERIAL	$6.20
PS-0.5EOptical Post, 0.5 in. Height, 1.0 in. Diameter, 8-32 Thread	IMPERIAL	$23
PS-1TTable Mount Adaptor, 1.0 in. Diameter Pedestals, 8-32 to 1/4-20	IMPERIAL	$23
PRC-3Optical Rail Carrier, 3.0 in. Length, 1/4-20 Thread, PRL Series	IMPERIAL	$137
SM-13Vernier Micrometer, 13 mm Travel, 9 lb. Load Capacity, 50.8 TPI	UNIVERSAL	$103
SM-25Vernier Micrometer, 25 mm Travel, 23 lb. Load Capacity, 50.8 TPI	UNIVERSAL	$163

Similar

Description	Compatibility	Price
BK-1AKinematic Base, Magnetic, 1 inch Square	IMPERIAL	$117
BK-2AKinematic Base, Magnetic, 2 inch x 2.45 inch	IMPERIAL	$134
110Kinematic Magnetic Base, 90 lb. Holding Force, 1/4-20 Thread	IMPERIAL	$271
BUP-2Universal Base, Freely Rotating Disk, Eccentric Clearance Slot	UNIVERSAL	$122
BKL-4Kinematic Base, Locking, 4 inch x 4.5 inch	IMPERIAL	$331
LNS-1Optic Inserter Stage, 8-32 Thread	IMPERIAL	$528