Name: 12.5mm Diameter, Uncoated, B270 Window
Brand: TECHSPEC
SKU: 45-637
Price: S$44.25

Abbe Number (v_d):

58.3

Bevel:

Protective as needed

Clear Aperture CA (mm):

11.25

Diameter (mm):

12.50 ±0.25

Thickness (mm):

2.00

Coating:

Uncoated

Coefficient of Thermal Expansion CTE (10^-6/°C):

9.4 (+20 to +300°C)

Density (g/cm³):

2.56

Edges:

Fine Ground

Index of Refraction n_d:

1.523

Knoop Hardness (kg/mm²):

500

Poisson's Ratio:

0.22

Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More

B270

Surface Flatness (P-V):

1λ

Surface Quality:

60-40

Type:

Protective Window

Wavelength Range (nm):

360 - 2700

Young's Modulus (GPa):

71.5

Regulatory Compliance

RoHS 2015:

Compliant

Reach 224:

Compliant

Certificate of Conformance:

View

Product Family Description

Large Selection of Sizes
Available Uncoated or with a MgF₂ Anti-Reflection Coating
Custom Sizes Available for Volume OEM Requirements

TECHSPEC® B270 Windows are ideal for commercial applications requiring a thin substrate. Available uncoated or with a MgF₂ Anti-Reflection coating, these windows are often used as a protective element between two environments. Custom sizes and coatings are available for OEM applications.

Title	Type	Stock Number	Price	Buy
12.5/12.7mm Optic Dia., SM05 Thin Mount, M4	Fixed	#13-789	S$27.00 Qty 5+ S$25.80 Request Quote	3-5 days ×
12.5/12.7mm Optic Dia., SM05 Thin Mount, 8-32	Fixed	#13-790	S$27.00 Qty 5+ S$25.80 Request Quote	3-5 days ×
12.5/12.7mm Optic Dia., E-Series Kinematic Mount	Adjustable - Tip-Tilt	#15-865	S$60.00 Qty 10+ S$57.00 Request Quote	3-5 days ×
12.5/12.7mm Optic Dia., L-Slot Direct Mount	Fixed	#36-416	S$78.00 Request Quote	3-5 days ×
12.5/12.7mm Optic Dia., Side Flange Direct Mount	Fixed	#36-418	S$78.00 Request Quote	3-5 days ×
2.0 - 35.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#03-668	S$88.50 Qty 10+ S$78.60 Request Quote	3-5 days ×
9.5 - 73.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#36-605	S$111.00 Qty 10+ S$98.10 Request Quote	3-5 days ×
12.5/12.7mm Optic Dia., Kinematic Mount, 2-Screws	Adjustable - Tip-Tilt	#58-850	S$129.00 Qty 5+ S$116.10 Request Quote	3-5 days ×
12.5/12.7mm Optic Dia., L-Slot and Rotation Direct Mount	Adjustable - Rotary	#36-417	S$129.00 Request Quote	3-5 days ×
5.0 - 25.0mm Optic Height, Metric Bar-Type Optic Holder	Fixed	#55-529	S$139.50 Qty 10+ S$125.55 Request Quote	Contact Us ×
7.0 - 40.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-676	S$142.50 Qty 10+ S$128.25 Request Quote	3-5 days ×
12.5/12.7mm Optic Dia., Compact Kinematic Mount, 2-Screws	Adjustable - Tip-Tilt	#34-720	S$144.00 Qty 5+ S$129.60 Request Quote	3-5 days ×
12.5/12.7mm Optic Dia., Kinematic Mount, 3-Screws	Adjustable - Tip-Tilt	#58-853	S$144.00 Qty 5+ S$129.60 Request Quote	3-5 days ×
10.0 - 60.0mm Optic Height, Metric Bar-Type Optic Holder	Fixed	#55-530	S$151.50 Qty 10+ S$136.35 Request Quote	3-5 days ×
7.0 - 67.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-669	S$154.50 Qty 10+ S$139.05 Request Quote	3-5 days ×
12.5/12.7mm Optic Dia., Compact Kinematic Mount, 3-Screws	Adjustable - Tip-Tilt	#34-721	S$157.50 Qty 5+ S$141.75 Request Quote	3-5 days ×
8.0 - 118.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-666	S$160.50 Qty 10+ S$144.45 Request Quote	3-5 days ×
4.0 - 36.0mm Optic Dia., Self-Centering Jaw Clamp	Fixed	#16-077	S$211.50 Qty 5+ S$186.15 Request Quote	3-5 days ×
2"/50.8mm Diameter, Bar Type Lens / Filter Holder, Quick Start Optical Mounts	Fixed	#17-530	S$215.55 Request Quote	Contact Us ×
12.5/12.7mm Optic Dia., X-Y Translating Optic Mount	Adjustable - Linear (XY)	#62-955	S$358.50 Qty 5+ S$340.65 Request Quote	3-5 days ×
5.0 - 100.0mm Optic Dia., Self-Centering Jaw Clamp	Fixed	#16-078	S$550.50 Qty 5+ S$485.55 Request Quote	3-5 days ×
12.5/12.7mm Optic Dia., Precision Gimbal Mount	Adjustable - Gimbal	#84-640	S$577.50 Qty 5+ S$519.75 Request Quote	3-5 days ×
12.5/12.7mm Optic Dia., X-Y-Z Translating Optic Mount	Adjustable - Linear (XYZ)	#62-958	S$589.50 Qty 5+ S$560.10 Request Quote	3-5 days ×