Compare Model Drawings, CAD & Specs Type Base size Thread Type Availability Price
BK-1A
$114
In Stock
 BK-1A Kinematic Base 25 x 25 mm 2-56 and 8-32
In Stock
 $114
BK-1A-T
$55
Contact Us
 BK-1A-T Kinematic Base Top Plate 25 x 25 mm 2-56 and 8-32
Contact Us
 $55
BK-1A-B
$73
In Stock
 BK-1A-B Kinematic Base Bottom Plate 25 x 25 mm 8-32 (M4) CLR
In Stock
 $73
BK-2A
$130
In Stock
 BK-2A Kinematic Base 50.5 x 62.2 mm 6-32 and 1/4-20
In Stock
 $130
BK-2A-T
$73
In Stock
 BK-2A-T Kinematic Base Top Plate 50.5 x 62.2 mm 6-32 and 1/4-20
In Stock
 $73
BK-2A-B
$86
In Stock
 BK-2A-B Kinematic Base Bottom Plate 50.5 x 62.2 mm 1/4-20 (M6) CLR
In Stock
 $86
BK-3A
$225
BK-3A Kinematic Base 76.2 x 76.2 mm 6-32 and 1/4-20 $225
BK-3A-T
$145
In Stock
 BK-3A-T Kinematic Base Top Plate 76.2 x 76.2 mm 6-32 and 1/4-20
In Stock
 $145
BK-3A-B
$174
In Stock
 BK-3A-B Kinematic Base Bottom Plate 76.2 x 76.2 mm 1/4-20 (M6) CLR
In Stock
 $174
BKL-4
$321
BKL-4 Kinematic Base 101.6 x 114.3 mm 1/4-20 $321
BKL-4-T
$114
In Stock
 BKL-4-T Kinematic Base Top Plate 88.9 x 101.6 mm 1/4-20
In Stock
 $114
M-BK-1A
$114
4 Weeks
 M-BK-1A Kinematic Base 25 x 25 mm M2 and M4
4 Weeks
 $114
M-BK-1A-T
$55
In Stock
 M-BK-1A-T Kinematic Base Top Plate 25 x 25 mm M2 and M4
In Stock
 $55
M-BK-2A
$130
In Stock
 M-BK-2A Kinematic Base 50.5 x 62.2 mm M3 and M6
In Stock
 $130
M-BK-2A-T
$73
M-BK-2A-T Kinematic Base Top Plate 50.5 x 62.2 mm M3 and M6 $73
M-BK-3A
$225
In Stock
 M-BK-3A Kinematic Base 76.2 x 76.2 mm M3 and M6
In Stock
 $225
M-BK-3A-T
$145
In Stock
 M-BK-3A-T Kinematic Base Top Plate 76.2 x 76.2 mm M3 and M6
In Stock
 $145
M-BKL-4
$321
In Stock
 M-BKL-4 Kinematic Base 101.6 x 114.3 mm M6
In Stock
 $321
M-BKL-4-T
$114
In Stock
 M-BKL-4-T Kinematic Base Top Plate 88.9 x 101.6 mm M6
In Stock
 $114

Features

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.

Reliable Mechanical Coupling

The BKL-4 Kinematic Bases are designed with a threaded lock-down mechanism located in the center of the base plate. Turning the thumb-wheel in the base plate rotates a threaded post, which tightens the tapped top plate to the base. Because the lock-down mechanism is located in the center of the three kinematic reference points, locking pressure is applied gradually and evenly for repeatable positioning time after time.

BKL-4 Locking Kinematic Base

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