Features

• Thickness: 60 mm (2.4")
• Sizes from 24" x 36" (600 mm x 900 mm) to 36" x 48" (900 mm x 1200 mm) Available
• Every Breadboard Individually Optimized, Tested, and Shipped with Test Data Certificate
• Constructed of 304L Grade Nonmagnetic Steel
• 1/2" (12.5 mm) Hole Border for Maximum Usable Area
• ±0.1 mm (±0.004") Surface Flatness over any 1 m² (11 ft²) Area
• 5 mm Stainless Steel Top and Bottom Skins with All-Steel Side Panels
• Steel-to-Steel Bonding Throughout Increases Thermal Stability

Thorlabs' 60 mm (2.4") thick Nexus™ breadboards are offered in a variety of lengths and widths from 24" x 36" (600 mm x 900 mm) to 36" x 48" (900 mm x 1200 mm). They feature all-steel construction, excellent thermal stability, and broadband damping optimized for each breadboard size. The 5 mm thick stainless steel top and bottom skins have a precision-machined matte finish with surface flatness of ±0.1 mm over any 1 m² area. The breadboard has 1/4"-20 (M6) mounting holes on 1" (25 mm) centers with a 0.5" (12.5 mm) border at the edge of the breadboard.

Virtually Nonmagnetic Construction
These breadboards are constructed of 304L grade stainless steel. This alloy of steel contains less iron than typical stainless steel, which reduces its ferromagnetic properties. 304L steel is usually referred to as "virtually nonmagnetic" since weak magnetic properties are still present. We can also construct breadboards of 316L grade stainless steel, which contains even less iron for even better nonmagnetic performance. Contact techsupport@thorlabs.com to order a custom 316L steel breadboard.

Nonmagnetic breadboards are built to order with a typical lead time of 4 - 6 weeks. Custom sizes and options are also available with a typical lead time of 6 - 8 weeks. See the Nexus Guide tab for a complete overview of the Nexus optical tables product line.

Support Options
We offer a number of support options for Breadboards. Our standard Breadboard Frames are available with rigid supports, or with passive or self-leveling active vibration isolation. We also offer passive and electronic isolator feet for mounting a breadboard on top of a table.

ScienceDesk Frames
Our ScienceDesk™ line of breadboard frames are ergonomic supports optimized for microscopy applications. They are available with rigid, passive, or active vibration isolators, and feature a number of convenient accessories. Sciencedesk frames are available to fit many of our breadboards sized from 2' x 3' to 3' x 4'.

Click for Details
2' x 3' Nexus Breadboard Mounted on a PFR6090-8 Rigid Breadboard Frame

Unpackaged Weights

Optimized Damping

Broadband Damping
The most important feature of a breadboard is its resonant frequency. Since Resonant frequency and vibration amplitude are inversely related, the resonant frequency should be as high as possible to minimize vibration intensity. Nexus tables and breadboards are broadband damped over a specific range of frequencies with the damping optimized to account for resonant frequency changes related to footprint, thickness, or the amount and location of load on the table or breadboard.

We have performed extensive testing to optimize the thickness/size ratio of our breadboards. Larger sized breadboards over 5' (1.2 m) long are offered with a standard 110 mm thickness. Smaller sizes are available in both 2.4" (60 mm) and 4.3" (110 mm) thicknesses.

Compliance

The most widely used transfer function for the vibrational response of an optical table is compliance. In the case of a constant (static) force, compliance is defined as the ratio of the linear or angular displacement to the magnitude of the applied force. In the case of a dynamically varying force (vibration), compliance is defined as the ratio of the excited vibrational amplitude (angular or linear displacement) to the amplitude of the force causing the vibration. Any deflection of the tabletop is evident by the change in relative position of the components mounted on the table surface. Therefore, by definition, the lower the compliance value is, the closer the optical table is to meeting the primary goal of optical table design, minimized deflection. Compliance is frequency dependant and is measured in units of displacement per unit force (meters per Newton).

Click to Enlarge
Compliance Test Schematic

See the Vibration Isolation Tutorial for more information on compliance.

Compliance Measurement Procedure
An impulse hammer is used to apply a measured force to the top surface of the table or breadboard, and transducers attached to the surface detect the resultant vibrations (see diagram to the right). The signals from the transducers are interpreted by the analyzer and used to produce a frequency response spectrum (i.e., a compliance curve). During the development phase of an optical table, compliance curves are recorded at many points on the tabletop; however, the compliance is always greatest at the corners. The compliance curves and data published by Thorlabs are from the sensors located on the corner of the table and therefore represent the worst case data.

Unique Test Data Certificate
Each individual Nexus product is tested and shipped with a unique test data certificate and compliance curve. This provides more accurate data compared to the industry standard of using a single size-specific compliance curve to represent the entire product line. The compliance curves and data published by Thorlabs are from sensors located on the corner of the table and therefore represent the worst case data.

Click to Enlarge
Nexus Table Compliance Testing

Test Results

60 mm Thick Breadboards

Item #	Breadboard Size (W x L x H)	Compliance Curve (Click to View)a
B1212F / B1212T	12" x 12" x 2.4"
B1224F / B1224T	12" x 24" x 2.4"
B1236F / B1236T	12" x 36" x 2.4"
B1824F / B1824T	18" x 24" x 2.4"
B2424F / B2424T	24" x 24" x 2.4"
B2436F / B2436T / B2436FN	24" x 36" x 2.4"
B2448F / B2448T	24" x 48" x 2.4"
B3030F / B3030T / B3030FN	30" x 30" x 2.4"
B3036F / B3036T / B3036FN	30" x 36" x 2.4"
B3036Y	30" x 36" x 2.4" (No Holes)
B3048F / B3048T / B3048FN	30" x 48" x 2.4"
B3048Y	30" x 48" x 2.4" (No Holes)
B3636F / B3636T / B3636FN	36" x 36" x 2.4"
B3648F / B3648T	36" x 48" x 2.4"
B3648Y	36" x 48" x 2.4" (No Holes)
B3030A / B3030L	30 cm x 30 cm x 60 mm
B3060A / B3060L	30 cm x 60 cm x 60 mm
B3090A / B3090L	30 cm x 90 cm x 60 mm
B4560A / B4560L	45 cm x 60 cm x 60 mm
B6060A / B6060L	60 cm x 60 cm x 60 mm
B6090A / B6090L / B6090AN	60 cm x 90 cm x 60 mm
B60120A / B60120L	60 cm x 120 cm x 60 mm
B7575A / B7575L / B7575AN	75 cm x 75 cm x 60 mm
B7590A / B7590L / B7590AN	75 cm x 90 cm x 60 mm
B75120A / B75120L / B75120AN	75 cm x 120 cm x 60 mm
B9090A / B9090L / B9090AN	90 cm x 90 cm x 60 mm
B90120A / B90120L / B90120AN	90 cm x 120 cm x 60 mm

110 mm Thick Breadboards

Item #	Breadboard Size (W x L x H)	Compliance Curve (Click to View)a
B2436G / B2436U	24" x 36" x 4.3"
B2448G / B2436U	24" x 48" x 4.3"
B2460G / B2460U	24" x 60" x 4.3"
B3036G / B3036U	30" x 36" x 4.3"
B3048G / B3048U	30" x 48" x 4.3"
B3060G / B3060U	30" x 60" x 4.3"
B3636G / B3636U	36" x 36" x 4.3"
B3648G / B3648U	36" x 48" x 4.3"
B3660G / B3660U	36" x 60" x 4.3"
B3672G / B3672U	36" x 72" x 4.3"
B4860G / B4860U	48" x 60" x 4.3"
B4872G / B4872U	48" x 72" x 4.3"
B6090B / B6090N	600 mm x 900 mm x 110 mm
B60120B / B60120N	600 mm x 1200 mm x 110 mm
B60150B / B60150N	600 mm x 1500 mm x 110 mm
B7590B / B7590N	750 mm x 900 mm x 110 mm
B75120B / B75120N	750 mm x 1200 mm x 110 mm
B75150B / B75150N	750 mm x 1500 mm x 110 mm
B9090B / B9090N	900 mm x 900 mm x 110 mm
B90120B / B90120N	900 mm x 1200 mm x 110 mm
B90150B / B90150N	900 mm x 1500 mm x 110 mm
B90180BT / B90180N	900 mm x 1800 mm x 110 mm
B120150B / B120150N	1200 mm x 1500 mm x 110 mm
B120180B / B120180N	1200 mm x 1800 mm x 110 mm

• The compliance curves here are typical, and slight variations may occur between individual tables. Each table is individually tested before shipment and includes a certificate with the individual test data and compliance curve (see Unique Test Data Certificate section, above).

Note: Compliance data will be available soon for models with a greyed out plot icon. Compliance data is measured for each breadboard, and thus will be included with these models upon purchase.

Nexus Tables and Breadboards Construction Details

Click to Enlarge
Nexus Table / Breadboard Cross Section, showing the (1) Top Skin, (2) Bottom Skin, (3) Side Finishing Trim, (4) Side Panels, and (5) Honeycomb Core

Precision Steel Construction for Thermal Stability

All Steel Construction
Thorlabs' Nexus tables and breadboards feature all-steel construction, including 5 mm thick top and bottom skins and a 0.25 mm thick precision formed and welded steel honeycomb core. The core is geometrically formed using accurate pressing tools, and geometric pitch is retained by using welded flat shims. The honeycomb core in our Nexus tables and breadboards extends from the top skin to the bottom skin without intermediate layers, leading to a stiffer, more thermally stable product.

Thermal Stability
The key aspect of the thermally stable Nexus design is symmetrical isotropic steel construction in all axes. Steel components expand and contract similarly, maintaining flatness during changes in temperature. The steel core extends from top to bottom skin without intermediate plastic or aluminum spill management structures that reduce the overall stiffness of the product and introduce a higher coefficient of thermal expansion. Steel side panels are used rather than wood, which can introduce environmental instability due to susceptibility to moisture.

Nexus Components

Note: For Illustrative Purposes Only. Not a representation of the Nexus Tables Construction Sequence

Click to Enlarge
Honeycomb Core of a Nexus Table During Manufacturing

Click to Enlarge
Nexus Tables and Breadboards Feature a Precision Machined Matte Finish, Holes that Extend to the Edge of the Tabletop, and Large Radius Corners

Machined Finish

Automated Finishing Process
Our Nexus tables and breadboards feature an automated orbital machined matte finish that is significantly smoother and flatter than our previous product line. The improved surface finish achieves ±0.1 mm (±0.004”) flatness over 1 m² (11 ft²), providing a solid contact surface for mounting components and reducing the need for stoning the top surface.

Large Radii Corners
Large radius corners are incorporated into the design, resulting in less pointed edges for lab safety.

Flexible Mounting Options

Individually Tapped, Countersunk Mounting Holes
Prior to bonding the components of the table, each mounting hole in the top surface is tapped and slightly countersunk to ensure that components mounted to the table sit flat. The mounting holes are then cleaned and sealed on the bottom with vinyl film discs (non-sealed models) or sealing cups (sealed hole models, see below). This ensures that each hole is completely free from any adhesive material. The vinyl film is easily punctured when using a hole for the first time. Cap screws can be finger tightened into the mounting holes of all Nexus tables and breadboards.

Reduced Hole Pattern Border
Our new top surface hole patterns extend to the edge of the table or breadboard with only a 12.5 mm (0.5”) border, equal to half of a hole spacing. This increases the usable area of the table and improves mounting option flexibility.

Increased Screw Depth and Optional Sealed Holes
Our custom-designed core maker produces precision formed and welded honeycomb core strips. The core is shaped and installed so that it does not intersect with any screw holes (see photo below, to right), allowing screws to be inserted far into the table, all the way to the bottom skin (for non-sealed-hole models). See the Specs tab for specific screw depth specifications, including outer border holes.

Click to Enlarge
Nexus breadboard showing the location of the honeycomb core and side panels, which do not intersect with any screw holes.
When sealing cups are not present, the maximum screw depth is equivalent to the thickness of the table or breadboard minus 5 mm. Sealed holes have a screw depth of 1” (25.4 mm) for both tables and breadboards. Border holes are 13.5 mm for breadboards and 23.5 mm for tables.

Sealed Mounting Holes
Tables and breadboards can be manufactured with nylon sealing cups glued to the underside of the top skin (see photo below) for liquid spill management. Sealed hole tables are available in all sizes and thicknesses, and the maximum screw depth is 1" (25.4 mm).

Mounting Holes on the Bottom Skin
Our breadboards feature at least four mounting holes in the base skin, permitting the secure attachment of standard or vibration isolating feet and allowing more flexibility for integrating breadboards onto tables or into setups in addition to using breadboard stands.

Laser-Engraved Measurement Grid
Optional laser-engraved measurement grid markings along table edges make it easy to duplicate setups and assist with difficult measurements.

Click to Enlarge
Nylon Sealing Cups Installation During Manufacturing

Standard Nexus™ Tables and Breadboards - Sizes Available

Thorlabs’ all new Nexus line of optical tables and breadboards is the result of over 25 years of experience in optical table manufacturing and a vision to supply a single, high-end-grade line of optical tables for photonics, imaging, and microscopy applications. Our Nexus tables and breadboards include a number of improved features, including enhanced damping, a precision-machined matte top and bottom finish, and holes to the edge of the tabletop. Each table is individually tested and includes a unique test data certificate.

Our tables and breadboards are available in many different sizes (see the tables below). Many of these sizes are stocked in our warehouses for same-day shipment, as indicated by green icons in the tables below. Other sizes are available as build-to-order products that can be shipped within 4 - 6 weeks of ordering and are indicated by blue icons below. We also provide a custom table and breadboard service. Common custom sizes are listed by yellow icons in the tables below. Contact Thorlabs' tech support to request a quote on these products.

Thorlabs' tables and breadboards qualify for our 10% new lab investment discount. For questions or feedback regarding our line of optical tables and breadboards, see the Feedback tab or contact your local Thorlabs' Tech Support office.

Many table and breadboard sizes are available in two thicknesses, with or without sealed holes. Nonmagtic steel tables and breadboards, plus table and leg kits, and breadboards with no holes are also available. Click on the green and blue icons below to see the stock and make-to-order tables available in each size.

Nexus Optical Tables

Metric

Width

	1 m	1.2 m	1.5 m
2 m	T1020C: 210 mm Thick T1020CK: 210 mm Thick, Kit with PTS610 Active Legs T1020P: 210 mm Thick, Sealed Holes T1020D: 310 mm Thick T1020Q: 310 mm Thick, Sealed Holes	T1220C: 210 mm Thick T1220CK: 210 mm Thick, Kit with PTS610 Active Legs T1220P: 210 mm Thick, Sealed Holes T1220D: 310 mm Thick T1220Q: 310 mm Thick, Sealed Holes	Contact Thorlabs Tech Support to Request a Quote
2.5 m	T1025C: 210 mm Thick T1025P: 210 mm Thick, Sealed Holes T1025D: 310 mm Thick T1025Q: 310 mm Thick, Sealed Holes	T1225C: 210 mm Thick T1225P: 210 mm Thick, Sealed Holes T1225D: 310 mm Thick T1225Q: 310 mm Thick, Sealed Holes T1225QK: 310 mm Thick, Sealed Holes, Kit with PTS610 Active Legs T1225CN: 210 mm Thick, 304L Grade Non-Magnetic Steel T1225PN: 210 mm Thick, Sealed Holes, 304L Grade Non-Magnetic Steel	T1525C: 210 mm Thick T1525P: 210 mm Thick, Sealed Holes T1525D: 310 mm Thick T1525Q: 310 mm Thick, Sealed Holes
3 m	Contact Thorlabs Tech Support to Request a Quote	T1230D: 310 mm Thick T1230Q: 310 mm Thick, Sealed Holes	T1530D: 310 mm Thick T1530Q: 310 mm Thick, Sealed Holes T1530QK: 310 mm Thick, Sealed Holes, Kit with PTS610 Active Legs
4 m	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	T1540D: 310 mm Thick T1540Q: 310 mm Thick, Sealed Holes

Imperial

Width

	3'	4'	4.8'
6'	T36H: 8.3" Thick T36V: 8.3" Thick, Sealed Holes T36J: 12.2" Thick T36W: 12.2" Thick, Sealed Holes	T46H: 8.3" Thick T46HK: 8.3" Thick, Kit with PTS602 Active Legs T46V: 8.3" Thick, Sealed Holes T46J: 12.2" Thick T46W: 12.2" Thick, Sealed Holes	Contact Thorlabs Tech Support to Request a Quote
8'	T38H: 8.3" Thick T38V: 8.3" Thick, Sealed Holes T38J: 12.2" Thick T38W: 12.2" Thick, Sealed Holes	T48H: 8.3" Thick T48HK: 8.3" Thick, Kit with PTS602 Active Legs T48V: 8.3" Thick, Sealed Holes T48J: 12.2" Thick T48W: 12.2" Thick, Sealed Holes T48WK: 12.2" Thick, Sealed Holes, Kit with PTS602 Active Legs T48HN: 8.3" Thick, 304L Grade Non-Magnetic Steel T48VN: 8.3" Thick, Sealed Holes, 304L Grade Non-Magnetic Steel	T58H: 8.3" Thick T58V: 8.3" Thick, Sealed Holes T58J: 12.2" Thick T58W: 12.2" Thick, Sealed Holes
10'	Contact Thorlabs Tech Support to Request a Quote	T410J: 12.2" Thick T410W: 12.2" Thick, Sealed Holes	T510J: 12.2" Thick T510W: 12.2" Thick, Sealed Holes T510WK: 12.2" Thick, Sealed Holes, Kit with PTS602 Active Legs
14'	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	T514J: 12.2" Thick T514W: 12.2" Thick, Sealed Holes

Legend

Icon	Availability	Typical Lead Timea
	Stocked Item	Same Day
	Build to Order	4 - 6 Weeks
	Custom Build	6 - 8 Weeks

• Exact lead times may vary across our product line. Check each individual item for exact lead times.

Nexus Breadboards

Metric

Width

	300 mm	450 mm	600 mm	750 mm	900 mm	1200 mm
300 mm	B3030A: 60 mm Thick B3030L: 60 mm Thick, Sealed Holes	Contact Thorlabs Tech Support to Request a Quote	-	-	-	-
600 mm	B3060A: 60 mm Thick B3060L: 60 mm Thick, Sealed Holes	B4560A: 60 mm Thick B4560L: 60 mm Thick, Sealed Holes	B6060A: 60 mm Thick B6060L: 60 mm Thick, Sealed Holes	-	-	-
750 mm	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	B7575A: 60 mm Thick B7575L: 60 mm Thick, Sealed Holes B7575AN: 60 mm Thick, 304L Grade Non-Magnetic Steel (Build to Order)	-	-
900 mm	B3090A: 60 mm Thick (Stocked) B3090L: 60 mm Thick, Sealed Holes (Build to Order)	Contact Thorlabs Tech Support to Request a Quote	B6090A: 60 mm Thick B6090L: 60 mm Thick, Sealed Holes B6090AN: 60 mm Thick, 304L Grade Non-Magnetic Steel B6090B: 110 mm Thick B6090N: 110 mm Thick, Sealed Holes	B7590A: 60 mm Thick B7590L: 60 mm Thick, Sealed Holes B7590AN: 60 mm Thick, 304L Grade Non-Magnetic Steel B7590B: 110 mm Thick B7590N: 110 mm Thick, Sealed Holes	B9090A: 60 mm Thick B9090L: 60 mm Thick, Sealed Holes B9090AN: 60 mm Thick, 304L Grade Non-Magnetic Steel B9090B: 110 mm Thick B9090N: 110 mm Thick, Sealed Holes	-
1200 mm	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	B60120A: 60 mm Thick B60120L: 60 mm Thick, Sealed Holes B60120B: 110 mm Thick B60120N: 110 mm Thick, Sealed Holes	B75120A: 60 mm Thick B75120L: 60 mm Thick, Sealed Holes B75120AN: 60 mm Thick, 304L Grade Non-Magnetic Steel B75120B: 110 mm Thick B75120N: 110 mm Thick, Sealed Holes	B90120A: 60 mm Thick B90120L: 60 mm Thick, Sealed Holes B90120AN: 60 mm Thick, 304L Grade Non-Magnetic Steel B90120B: 110 mm Thick B90120N: 110 mm Thick, Sealed Holes	Contact Thorlabs Tech Support to Request a Quote
1500 mm	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	B60150B: 110 mm Thick B60150N: 110 mm Thick, Sealed Holes	B75150B: 110 mm Thick B75150N: 110 mm Thick, Sealed Holes	B90150B: 110 mm Thick B90150N: 110 mm Thick, Sealed Holes	B120150B: 110 mm Thick B120150N: 110 mm Thick, Sealed Holes
1800 mm	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	B90180B: 110 mm Thick B90180N: 110 mm Thick, Sealed Holes	B120180B: 110 mm Thick B120180N: 110 mm Thick, Sealed Holes

Imperial

Width

	12"	18"	24"	30"	36"	48"
12"	B1212F: 2.4" Thick B1212T: 2.4" Thick, Sealed Holes (Build to Order)	B1812F: 2.4" Thick B1812T: 2.4" Thick, Sealed Holes	-	-	-	-
24"	B1224F: 2.4" Thick B1224T: 2.4" Thick, Sealed Holes	B1824F: 2.4" Thick B1824T: 2.4" Thick, Sealed Holes	B2424F: 2.4" Thick B2424T: 2.4" Thick, Sealed Holes	-	-	-
30"	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	B3030F: 2.4" Thick B3030FN: 2.4" Thick, 304L Grade Non-Magnetic Steel B3030T: 2.4" Thick, Sealed Holes	-	-
36"	B1236F: 2.4" Thick B1236T: 2.4" Thick, Sealed Holes	Contact Thorlabs Tech Support to Request a Quote	B2436F: 2.4" Thick B2436T: 2.4" Thick, Sealed Holes B2436FN: 2.4" Thick, 304L Grade Non-Magnetic Steel B2436G: 4.3" Thick B2436U: 4.3" Thick, Sealed Holes	B3036F: 2.4" Thick B3036Y: 2.4" Thick, No Holes B3036T: 2.4" Thick, Sealed Holes B3036FN: 2.4" Thick, 304L Grade Non-Magnetic Steel B3036G: 4.3" Thick B3036U: 4.3" Thick, Sealed Holes	B3636F: 2.4" Thick B3636T: 2.4" Thick, Sealed Holes B3636FN: 2.4" Thick, 304L Grade Non-Magnetic Steel B3636G: 4.3" Thick B3636U: 4.3" Thick, Sealed Holes	-
48"	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	B2448F: 2.4" Thick B2448T: 2.4" Thick, Sealed Holes B2448G: 4.3" Thick B2448U: 4.3" Thick, Sealed Holes	B3048F: 2.4" Thick B3048Y: 2.4" Thick, No Holes B3048T: 2.4" Thick, Sealed Holes B3048FN: 2.4" Thick, 304L Grade Non-Magnetic Steel B3048G: 4.3" Thick B3048U: 4.3" Thick, Sealed Holes	B3648F: 2.4" Thick B3648Y: 2.4" Thick, No Holes B3648T: 2.4" Thick, Sealed Holes B3648G: 4.3" Thick B3648U: 4.3" Thick, Sealed Holes B3648FN: 2.4" Thick, 304L Grade Non-Magnetic Steel	Contact Thorlabs Tech Support to Request a Quote
60"	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	B2460G: 4.3" Thick B2460U: 4.3" Thick, Sealed Holes	B3060G: 4.3" Thick B3060U: 4.3" Thick, Sealed Holes	B3660G: 4.3" Thick B3660U: 4.3" Thick, Sealed Holes	B4860G: 4.3" Thick B4860U: 4.3" Thick, Sealed Holes
72"	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	Contact Thorlabs Tech Support to Request a Quote	B3672G: 4.3" Thick B3672U: 4.3" Thick, Sealed Holes	B4872G: 4.3" Thick B4872U: 4.3" Thick, Sealed Holes