Product Description
Thorlabs P6 Ø1.5″ Mounting Post – Stainless Steel Optical Post for Rigid 3D Structures
This used Thorlabs P6 is a Ø1.5″ diameter mounting post fabricated from solid, non-magnetic 303 stainless steel . With a length of 6.0 inches (152.4 mm) , it is part of Thorlabs’ P-Series of large-diameter posts designed for constructing extremely rigid optomechanical assemblies with demanding structural integrity requirements .
Each end features a 1/4″-20 (M6) tapped hole, allowing multiple posts and post spacers to be stacked together to achieve a wide range of mounting heights . The large-diameter relief cuts at the end interfaces provide exceptional strength and rigidity when components are clamped. A side-located clearance hole accommodates a 3/16″ (5 mm) balldriver, providing the leverage needed to securely tighten stacked components .
Condition Note: This unit is used and sold as-is. It may show signs of normal laboratory wear such as minor scuffs or marks from mounting. No mounting hardware is included.
Key Specifications
| Specification | Details |
|---|---|
| Manufacturer | Thorlabs, Inc. |
| Model | P6 |
| Type | Mounting Post |
| Diameter | 1.5 inches (38.1 mm) |
| Length | 6.0 inches (152.4 mm) |
| Material | Non-magnetic 303 Stainless Steel |
| Threading | 1/4″-20 (M6) tapped holes on both ends |
| Thread Depth | 0.375″ – 0.400″ (9.5 – 10.2 mm) |
| Drive Feature | Side-lateral clearance hole for 3/16″ (5 mm) balldriver |
| Comparable New Price | 60–70 (estimated, similar to P5 at $58.36) |
| Condition | Used – As-is |
Applications
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Laser Beam Steering: Rigid mounting for mirrors, mounts, and other optomechanical components
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Optical Breadboard Construction: Stackable design for creating custom-height support structures
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Interferometry: Stable platform for vibration-sensitive optical setups
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OEM Systems: Integration into custom laboratory or industrial equipment
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Education: Teaching laboratory setups requiring sturdy, reconfigurable mounting
Compatible Accessories
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P-Series Post Spacers: For achieving intermediate heights between standard post lengths
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P-Series Post Bases: For securely fastening posts to optical tables or breadboards
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Thread to Dowel Pin Adapters: For aligning posts over tapped holes in mounting surfaces
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PH Series Post Holders: For clamping and positioning these posts



