Vacuum-Compatible Ø1/2" Post System

• Constructed of 304L and 316 Stainless Steel for Vacuum Applications
• One 8-32 (M4) Tapped Hole on Top and One 1/4"-20 (M6) Tapped Hole at Base
• Removable 8-32 (M4) Threaded Setscrew
• Available in Lengths Ranging from 3/4" to 3" (20 mm to 75 mm)
• We Also Offer a Complete Line of Standard Ø1/2" Posts

These nonmagnetic, vacuum-compatible stainless steel posts are precision ground to Ø1/2" (Ø12.7 mm). One end has a 1/4"-20 (M6) tapped hole, while the other end has a removable, 8-32 (M4) threaded setscrew (5/64" [2 mm] hex). A side-located Ø0.13" (Ø3.1 mm) hole is bored straight through the post; a balldriver can be inserted through the hole to provide extra leverage when tightening mounted components. This hole also serves to vent the 8-32 (M4) threaded hole. The 1/4"-20 (M6) hole in the bottom of the post is not vented, so we recommend using a vented cap screw.

• Vacuum-Compatible, Unanodized Design (>10^-6 Torr)
• Double Vacuum Bagged for Cleanroom Environments
• Extra Wide Relief Cut Provides a Two-Line Stable Contact for Post
• 1/4"-20 (M6) Tapped Hole on Bottom
• We Also Offer a Complete Line of Standard Ø1/2" Post Holders

These vacuum-compatible post holders are constructed from 6061-T6 and 2024-T3 aluminum and are designed with a wide, square relief cut that provides two lines of contact for highly stable post mounting. The imperial and metric post holders are equipped with our 3/16" (TS25HV) and 5 mm (TS6HV/M) vacuum-compatible hex-locking thumbscrews, respectively (also available separately below).

Please note that we do not recommend using an L wrench to tighten the thumbscrews included with these post holders, as this may break off the screw head. The recommended maximum torque is 28 in·lbs (3.2 N·m).

Item #	BA1SV(/M)	BA1V(/M)	BA2V(/M)
Image (Click to Enlarge)
Slots	1	2	2
Slot Type	Straight	Straight	Straight
Slot Length	1.10" (27.9 mm)	0.81" (20.1 mm)	1.25" (31.8 mm)
Mounting Holes	1	1	3
Dimensions (W x L x H)	1" x 2.3" x 3/8" (25 mm x 58 mm x 10 mm)	1" x 3" x 3/8" (25 mm x 75 mm x 10 mm)	2" x 3" x 3/8" (50 mm x 75 mm x 10 mm)
Vacuum Compatibility	>10-6 Torra
Material	6061-T6 Aluminum
Outgassing Rate at 20 °C	7.6 x 10-9 Torr-Liters/s/cm2
Packaging	Double Vacuum Bagged

• This is the pressure at which these components can be used directly out of the packaging with no additional processing. They can be used at even lower pressures with additional cleaning and processing.

• Mount Ø1/2" Post Holders and Other Components to an Optical Table or Breadboard
• Vacuum-Compatible Design (>10^-6 Torr)
• Double Vacuum Bagged for Cleanroom Environments
• Same Stability and Footprint as Our Standard Mounting Bases

These vacuum-compatible bases are similar to our standard mounting bases, which allow post holders to be secured to an optical table in a variety of position. A 3/8" (10 mm) long 1/4"-20 (M6) vented cap screw (SH25S038V for imperial or SH6MS10V for metric) is recommended for attaching post holders to our mounting bases.

The TS25HV and TS6HV/M are 1/4"-20 or M6 x 1.0-threaded for compatibility with our imperial or metric Vacuum-Compatible Ø1/2" Post Holders, respectively. Please note that we do not recommend using an L wrench hex key to tighten these thumbscrews, as this may break off the screw head. The recommended maximum torque is 28 in·lbs (3.2 N·m). We also offer standard spring-loaded thumbscrews.

TS25HV Drawing