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Ø1.5" Post Basics![]() PF175B Clamping Fork Securing a Ø1.5" Post with a PB4 Base Adapter PF175B Clamping Fork Securing a Ø1.5" Post with a PB4 Base Adapter P1 P1 P1.5 P1.5 P2 P2 P3 P3 P4 P4 P5 P5 P6 P8 P6 P10 P8 P12 P10 P14 P12 PS1M P14 PS1M PS4M PS4M PS7M PS7M PS10M PS10M PB2 PB2 PB1 PB1 PB4 PB4 1/4" (M6) Counterbored Slots 1/4" (M6) Counterbored Slots 1/4" (M6) Counterbores 1/4" (M6) Counterbores Ø1.5" Post Spacers Ø1.5" Post Spacers 1/4"-20 Tapped Holes On Both Ends 1/4"-20 Tapped Holes On Both Ends
Related Items ![]() Please Wait Our Ø1.5" Mounting Posts, which are fabricated from nonmagnetic 303 stainless steel, offer a wide range of basic building blocks for assembling large, rigid, 3D structures. The post products detailed on this page are the most essential construction elements onto which a host of accessories can be fastened. The solid stainless steel construction of our posts, post spacers, and post bases are complimented by large-diameter relief cuts at end interface points to provide exceptional strength and rigidity. The stackable P-Series Posts and Post Spacers can be combined to offer a wide range of achievable mounting heights, while the P-Series Bases offer versatility when fastening posts to an optical table. A 1/4"-20 (M6) tapped hole in each post end provides sufficient clamping strength to join to posts, effectively making them one longer rigid post.
![]() ![]() Click to Enlarge Our Ø1.5" posts can also be used to mount our Post-Mounted ScienceDesk™ shelves, brackets, and monitor mount. ![]() Click to Enlarge Top of Metric Ø1.5" Post. ![]() Click to Enlarge Top of Imperial Ø1.5" Post.
These solid stainless steel Ø1.5" (Ø38 mm) P-series posts, offered in heights ranging from 1" (25 mm) to 14" (350 mm), are designed for constructing extremely rigid assemblies with demanding structural integrity requirements. The stackable design, which has 1/4"-20 (M6) tapped holes on both ends, allows the joining of multiple mounting posts to achieve an array of lengths. These posts have a thread depth between 0.375" (9.525 mm) and 0.400" (10.16 mm). Using a 3/16" (5 mm) balldriver inserted through the side clearance hole, sufficient torque can be achieved to securely tighten stacked posts. These posts also feature a large-diameter relief cut on both ends for mounting stability. For ease in distinguishing between the imperial and metric versions, the tops and bottoms of the metric posts have a ring engraved on them, while the imperial posts have no such engraving (see images above on the right). Post spacers are also available below to provide greater flexibility in height. Please note that if your application requires tighter tolerances than those offered by the P-series [±0.005" (±0.127 mm)] or height adjustability, we recommend using the BLP01 Adjustable Height Post. ![]()
These solid stainless steel Ø1.5" (Ø38 mm) post spacers are designed to achieve post heights that are between those offered by any two P-Series posts. For example, a post height of 28 mm is achieved simply by attaching a PS3M (3 mm post spacer) to a P25/M (25 mm post). The spacer provides a center-located 1/4" (M6) clearance hole for access to the P-series posts as well as a large-diameter relief cut on both spacer ends for mounting stability. Please note that for applications requiring tight height tolerances, we recommend using a BLP01 Adjustable Height Post. ![]()
Pedestal Base Adapter Clamping Fork Made from stainless steel, the PF175B clamping fork creates three points of contact with the table for high stability. The 2.12" (53.8 mm) long counterbored slot for 1/4"-20 (M6) cap screws allows the most convenient mounting hole to be selected and creates flexibility in the positioning of post assemblies. Please note that significant overtightening of clamping forks can deform the surface of an optical table, which can cause misalignment of components and decrease stability. The PF175B clamping fork is available idividually or in packs of five. ![]() PB1 PB2 and PB2/M Pedestal Base Adapter ![]() ![]() Click to Enlarge CL8 Clamps Securing P4 Ø1.5" Post on PB4 Pedestal ![]() Click to Enlarge CL8 Cross-Sectional View
Thorlabs' CL8 pedestal post clamp secures our Ø1" and Ø1.5" pedestal posts to an optical table or breadboard. Its V-shaped tip provides two-point contact with the post perimeter and its rounded edge increases the contact area along the table. ![]()
Thorlabs' Position Retainers can be used to realign posts that have been removed from an optical system. They act as markers on the breadboard or optical table in the event that you need to remove a post from your setup. The two dots near the ends of the outer arms of the retainer mark the two points of post contact. The third dot, located within the V-groove, is for retaining the position of a square base or other squared-off component. For more information on using our retainers with square components, click here. The RSPC Fixed Retainer is a compact solution for use with Ø1" and Ø1.5" Pedestal Posts. The post should be independently clamped down before aligning the RSPC retainer. After the retainer is mounted in place, the post can be removed from the setup and then later placed back into the same position. The RSPCS(/M) Swivel Retainer features a swivel head for 200° of rotational adjustment. This allows for access to additional mounting holes on the breadboard. The post should be independently locked before aligning RSPCS(/M) retainer. Partially loosen the tension adjuster screw and then mount the retainer to a breadboard tap while maintaining contact with the post. Lastly, tighten the tension adjuster screw. After this the component can be removed from the setup and then later placed back into the same position. ![]() Click to Enlarge RSPCS Swiveling Position Retainer | |||||||||||||||||
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