Post Holder

LDTGJ1-xx Series High-precision Optical Post Holders Optical Constitute Different Optical Path Systems and Optical Instruments

Nanchang Leadtop Technology Co.,Ltd

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The center hole has a finely machined V-shaped groove, which does not produce other position changes when adjusting the height of the connecting rod. The M6 threaded hole at the bottom is convenient for connecting with other optical mounts. It is an intermediate connector with products of different height series. The upper end is ...

Specifications
Max Post Diameter:	25 mm
Length:	150 mm
Model:	LSGB1-4
Installation Thickness:	4mm
Installation Width:	35-300mm

Data Sheet

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Guide to Opto‑Mechanical Post Holders

In photonics and laser systems, precision alignment and mechanical stability are critical. That’s why post holders are indispensable components in any opto‑mechanical setup. At FindLight, our category of posts and post holders offers high‑quality, reliable solutions from over 30 global suppliers.

What Is a Post Holder?

A post holder (also called a post clamp or mounting base) is a mechanical fixture featuring a finely machined inner bore, often with a V‑shaped groove, that secures optical posts in exact alignment—vertically or rotationally—without introducing shift when adjusting height. These holders sit on optical tables or breadboards, anchoring posts via ¼‑20 or M6 threads.

Why Use a Post Holder?

Precise centering. Many use three‑point inner contact to auto‑center posts, ensuring repeatable setups and minimal drift.
Height and rotation control. Adjustable or fixed holders allow fine-tuning in Z‑axis and yaw orientation.
Strong stability. Materials like anodized aluminium with brass inserts deliver rigidity and vibration resistance.

Types of Post Holders

Standard static holders – Secure a fixed post height. Ideal for long-term, stable mounts.
Height‑adjustable holders – Offer vertical translation via collar or spring mechanisms, with locking thumbscrews for stability.
Specialized designs – Cam‑lock, brake‑shoe, swivel‑clamp, and magnetic‑base options enable quick adjustments or flexible positioning.

Integration in Optical Systems

Post holders are central to foundational optical systems. As seen in Thorlabs’ instructional videos, choosing the right holder height and mounting method significantly reduces vibration and alignment drift. For larger optics, using paired holders and bases enhances stability and beam path integrity.

Choosing the Right Post Holder

Post diameter & thread type: Ensure compatibility with 0.5″ (12.7 mm) posts and ¼‑20 or M6 bases.
Height & adjustment needs: Choose between fixed or translating holders.
Base design: Magnetic, slotted, or pedestal bases add flexibility.
Material quality: Opt for anodized aluminium with brass inserts for durability and precision fit.

Did You know?

Did you know that post holders do much more than clamp optical posts? Some feature internal V‑grooves that hold posts centered without shifting, even when adjusting height! This design ensures you can raise or lower optics without misalignment—a huge benefit during critical experiments. Many post holders use a three‑point contact system, especially in metric or English threaded versions. These contact pads run along the inner bore, centering posts with unmatched precision—eliminating the need for manual centering and reducing setup time. Manufacturers like Newport and Edmund Optics also offer magnetic or cam‑lock base types that allow quick repositioning on optical tables without removing the post. The result? Flexible adjustments in lab setups without sacrificing mechanical stability. So next time you're aligning a lens or mirror, remember: the right post holder design makes all the difference between stable experiments and frustrating drift!

External links:
1 - Optimizing Your Setup: How to Choose Optical Posts and Post Holders
2 - Optical Mount (3 Things to Consider when Choosing)

Posts and Post Holders