Optical Mount Adaptor, 101.6 mm to 76.2 mm (4 to 3 inch)

The A-4-3 Optical Mount Adapter allows a 3 inch (76.2 mm) diameter optic to be mounted in a 4 inch (76.2 mm) diameter optical mount adding additional utility to your existing optical mounts.
Resources & Downloads
2D Product Drawings
A-4-3-S(67.2 kB, PDF)
Other
A-4-3 RoHS Certificate(278.2 kB, PDF) A-4-3_RoHS2021.pdf(681.6 kB, PDF)
Related Products
Accessories
| Compare | Description | Drawings, CAD & Specs | Avail. | Price | ||
|---|---|---|---|---|---|---|
![]() | AW-1Adaptor Washers, 1/4-20 (M6) to 8-32 (M4), Qty 10 | In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More | ||||
![]() | BB-LOptical Beam Block, Tool Holder, Magnetic-Base, Large | In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More | ||||
![]() | SW-OMSpanner Wrench, Compact, 6.35 to 50.8 mm Diameter Optics | In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More | ||||
![]() | BDK-1Ball Driver Allen Wrench Set, Includes 9 Ball drivers | In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More | ||||
![]() | SK-ASocket Head Cap Screw Kit, Stainless Steel, 8-32 & 1/4-20, Qty 805 | In Stock |
Similar
| Compare | Description | Drawings, CAD & Specs | Avail. | Price | ||
|---|---|---|---|---|---|---|
![]() | A-2-1Optical Mount Adaptor, 50.8 mm to 25.4 mm (2 to 1 inch) | In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More | ||||
![]() | A-2-1.5Optical Mount Adaptor, 50.8 mm to 38.1 mm (2 to 1.5 inch) | In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More | ||||
![]() | A-75-50Optical Mount Adaptor, 19.1 mm to 12.7 mm (0.75 to 0.5 inch) | In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More | ||||
![]() | UPA-OMObjective Lens Adapter, RMS Thread, 1 inch Mount | In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More |
Compatible
| Compare | Description | Drawings, CAD & Specs | Avail. | Price | ||
|---|---|---|---|---|---|---|
![]() | 605-4Gimbal Optic Mount, Low-distortion Axial Clamping, 4.0 in. Diameter | In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More | ||||
![]() | 30D20ER.2Silver Mirror, Borofloat, 76.2 mm, λ/10, 480-20,000 nm | In Stock | ||||
![]() | 30D20BD.1Dielectric Mirror, Broadband, 76.2 mm, λ/10, 488-694 nm | In Stock | ||||
![]() | KPX232Plano-Convex Lens, N-BK7, 76.2 mm Diameter, 300 mm EFL, Uncoated | In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More |














