ZGA-25 Ø25 mm Stainless Steel Optical Posts

This ZGA-25 listing offers stainless steel optical posts with a 25 mm body and round pedestal flange. All 17 individual model cards have been checked, covering metric and inch-equivalent lengths. ZGA-25-05 is labeled 12.7 mm and ZGA-25-12.5 is labeled 12.5 mm; select these separately. The geometry matches the other ZGA-25 source listing, while SKU identities and evidence remain separate.

Models and stated lengths

Individual cards label suffixes 05, 1, 1.5, 2, 2.5, 3, 4 and 6 as 12.7, 25.4, 38.1, 50.8, 63.5, 76.2, 101.6 and 152.4 mm. Other cards state 12.5, 20, 25, 30, 38, 50, 75, 100 and 150 mm. Promotional copy gives a 12.7–152.4 mm range, yet the separate 12.5 mm card is present; the model-specific label is retained. No formal drawing establishes flange diameter, thickness or whether the stated length includes the flange.

Threads and tool access

The series image identifies an M4 top thread and M6 underside thread and shows one removable screw of each size offered with the product. Confirm this supply arrangement for the selected model. Longer post photographs show a transverse tool hole, labeled 5 mm through-hole in the series image; it is not a mounting thread. No side hole is visible in the 12.5 or 12.7 mm stub-post cards, so it is not assumed for those options.

Mounting compatibility

The M4 top thread can connect compatible optical hardware, while the M6 underside thread provides a mounting connection. Confirm how the pedestal is secured to the selected table or clamp. This listing does not show a complete optical assembly; mirror mounts, fork clamps, tables and spacers are not automatically included. Check optical center height and flange-clamping clearance. The stated length alone does not establish final assembly height.

Material and supply details

The source describes stainless steel and precision grinding, with silver surfaces in the photographs. No steel grade, roughness, straightness, dimensional tolerance or load rating is supplied, so the grinding claim does not establish a numerical accuracy class. Confirm supplied screws and order quantity by model. Several posts shown together do not define a kit.

Selection checklist

Complete model and card-stated length

Length datum and flange dimensions

M4/M6 thread fit and supplied screws

Tool-hole needs and foot-clamping clearance

Quantity, accessories and final assembly height

To be confirmed

Flange diameter, thickness and length datum

Steel grade, accuracy and loading

Model-specific threads and tool-hole position

Supplied screws and mounting accessories