THORLABS RA135 Clamp Posts Hex 45 1/2 3/16

( Brand: Thorlabs ), ( Manufacturer Part Number: RA135 ), ( Type: Right-angle Clamp ), ( Unit Type: Unit )

Review THORLABS Lot Of 45 Degree Clamp 1/2 Inch Posts 3/16 Hex Read

The **Thorlabs RA135 45 Clamp for 1/2" Posts with 3/16" Hex Bolt** is a precision-engineered optical mounting solution designed for secure, repeatable, and versatile attachment of optical components, fixtures, or experimental setups to Thorlabs robust 1/2" post systems. Crafted from high-quality aluminum alloy, this clamp combines durability with exceptional rigidity, ensuring stability even under moderate to heavy loads while maintaining minimal vibration transmission a critical consideration in sensitive optical, laser, or precision measurement applications. Its 45-degree orientation provides a convenient angle for mounting components such as mirrors, lenses, or detectors at an optimal tilt, facilitating efficient beam steering, alignment, or spatial arrangement within a lab environment. The clamp features a **3/16" hex bolt** for secure fastening, allowing for precise torque adjustment to prevent over-tightening while ensuring a snug, vibration-resistant grip. The design incorporates a **self-centering mechanism**, enabling quick and accurate alignment of the mounted component, reducing setup time and minimizing the risk of misalignment during adjustments. Compatible with Thorlabs extensive range of 1/2" post accessories, including post holders, bases, and adapters, this clamp seamlessly integrates into modular optical benches, experimental rigs, or custom setups. Whether used in laser physics, spectroscopy, microscopy, or industrial metrology, the RA135 delivers a balance of strength, flexibility, and ease of use, making it an indispensable tool for researchers and engineers demanding both precision and reliability in their optical systems.

The Thorlabs RA135 45 Clamp for 1/2-inch posts with a 3/16-inch hex adjustment screw is a versatile optical mounting component commonly used in precision optical setups. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Precision and Stability**

The clamp is designed for high-precision optical applications, ensuring that components like lenses, mirrors, or mounts remain securely and stably positioned. The 45 angle allows for flexible alignment in optical paths, reducing the need for additional adapters or complex mounting setups.

2. **Compatibility with Thorlabs Ecosystem**

Thorlabs components are widely used in optics and laser systems, and this clamp is fully compatible with other Thorlabs 1/2-inch post mounts, including kinematic mounts, translation stages, and post holders. This interoperability simplifies system integration and reduces the need for third-party adapters.

3. **Adjustability**

The 3/16-inch hex adjustment screw allows for fine-tuning the position of the clamped component. This is particularly useful for aligning optical elements where slight adjustments are critical for optimal performance (e.g., focusing a lens or aligning a beam).

4. **Durability and Build Quality**

Thorlabs components are known for their robust construction, often featuring hardened steel or precision-machined parts. This clamp is likely to withstand repeated adjustments and high-precision applications without significant wear or drift.

5. **Modularity**

The clamp can be used in conjunction with other Thorlabs accessories, such as post holders, kinematic mounts, or translation stages, allowing for scalable and adaptable optical setups. This modularity is ideal for research labs, industrial applications, or educational environments where flexibility is key.

6. **Easy Installation**

The design is straightforward, requiring minimal tools (typically just a hex key) for installation and adjustment. This makes it accessible for both experienced technicians and those new to optical alignment.

7. **Wide Range of Applications**

Beyond basic optical alignment, this clamp can be used in laser systems, interferometry, microscopy, and other precision instrumentation where secure and adjustable mounting is required.

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### **Cons**

1. **Cost**

Thorlabs components are often more expensive than generic or third-party alternatives. For budget-conscious users or those with limited funding, this clamp may represent a significant investment, especially if multiple units are needed.

2. **Limited to Thorlabs Ecosystem**

While the compatibility with Thorlabs parts is a pro, it also means that the clamp may not be directly compatible with non-Thorlabs mounts or posts (e.g., those from Newport, Edmund Optics, or other manufacturers). Users may need additional adapters or conversion parts, which can add to the overall cost and complexity.

3. **Potential for Overkill**

For very simple or low-precision applications (e.g., basic educational demonstrations or non-critical optical setups), the precision and features of this clamp may be unnecessary. A simpler, cheaper clamp could suffice without sacrificing performance.

4. **Hex Key Dependency**

The adjustment requires a 3/16-inch hex key, which must be available and accessible during setup or alignment. Losing or misplacing the key could temporarily halt work, though this is a minor inconvenience for most users.

5. **Weight Limitations**

While Thorlabs clamps are generally sturdy, there may be limits to the weight of components they can securely hold without loosening or slipping. For very heavy or large optical elements, additional support (e.g., reinforced mounts or multiple clamps) may be required.

6. **Learning Curve for Alignment**

Achieving precise alignment with this clamp may require some practice, especially for users unfamiliar with optical setup techniques. Inexperienced hands might struggle to achieve optimal positioning without trial and error.

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### **Conclusion**

The Thorlabs RA135 45 clamp is an excellent choice for users working in high-precision optical systems where stability, adjustability, and compatibility with Thorlabs components are critical. Its durability, modularity, and ease of use make it a reliable tool for research, industrial, or educational applications. However, its higher cost and ecosystem-specific compatibility may not justify its purchase for simple or budget-limited setups. Additionally, users outside the Thorlabs ecosystem may need to invest in additional adapters or consider alternatives.

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### **Recommendation**

- You are already using Thorlabs components in your optical setup and need a reliable, high-precision clamp for alignment.

- Your application demands fine adjustability and stability, such as in laser systems, interferometry, or microscopy.

- You prioritize long-term compatibility and modularity with Thorlabs extensive product line.

- You have the budget to invest in high-quality optical hardware and are willing to pay for precision and durability.

- Your application is simple or low-precision, and a cheaper, generic clamp would suffice.

- You are working with non-Thorlabs mounts or posts, as compatibility may require additional adapters.

- Budget constraints are a significant factor, and you can find equally effective (or nearly so) alternatives from other manufacturers at a lower cost.

- You are new to optical alignment and may benefit from a simpler, more forgiving clamp to learn the basics.

For users on a tight budget or those outside the Thorlabs ecosystem, alternatives like Newport s or Edmund Optics clamps may offer comparable functionality at a lower price, though they may lack the same level of integration with Thorlabs broader product line. Always weigh the specific requirements of your project against the features of the clamp to make the best decision.

Details:

4 x THORLABS RA135 45 degree CLAMP FOR 1/2 POSTS, 3/16 HEX, Read 2 are marked Thorlabs and not with or PN Please see images, SLOC KDK 104.

part #: ra135 price

• $35.00

specifications linactuat:

• brand: Thorlabs
• mpn: Ra135
• type: Right-angle Clamp
• unit type: Unit

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• availability: In Stock
• started: June 2, 2026
• quantity: 1
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• Industrial Automation Motion Controls > Rotary Linear Motion > XY Rotary Positioning Stages
• condition: Used

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• rating: 100.0%
• city: Redwood City, California
• # reviews: 4517

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• policy: Returns Accepted
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• paid by: Seller

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