SECO 5070-051 Pole Vial Assembly for 1.50 in OD Poles | 8, 20, & 40 min Options

Overview

The SECO 5070-051 Pole Vial Assembly is designed for use with survey poles measuring 1.50 inches in outside diameter. It provides a convenient leveling reference for prism poles, GNSS rods, range poles, and other compatible surveying setups where keeping the pole plumb is important.

The assembly is available with three vial sensitivities—8-minute, 20-minute, and 40-minute—allowing users to choose the level of sensitivity that best matches their field application. Each version includes the appropriate SECO replacement vial and mounting screws.

Key Features

• Pole vial assembly for 1.50-inch OD poles
• SECO product series: 5070-051
• Fits poles measuring 1.50 inches in outside diameter
• Available with 8-minute, 20-minute, or 40-minute vial
• Helps keep prism, GNSS, and survey poles plumb
• Includes the appropriate vial for the selected model
• Mounting screws included
• Three part-number configurations available
• Replacement vial part numbers identified for each version
• Suitable for surveying, construction layout, GNSS, and prism applications

Designed for 1.50-Inch OD Poles

The SECO 5070-051 series is specifically designed for poles with an outside diameter of:

• 1.50 in
• Approximately 38.1 mm

The correct pole diameter should be confirmed before ordering to ensure a proper fit.

The assembly can be used with compatible prism poles, rover rods, antenna poles, range poles, and other survey poles that use the specified 1.50-inch outside diameter.

Available Vial Sensitivities

The series is available with three vial sensitivity options:

• 8-minute vial
• 20-minute vial
• 40-minute vial

A lower minute rating indicates a more sensitive vial. More sensitive vials show smaller deviations from vertical more readily, while less sensitive versions may be easier to use for general field positioning.

The best choice depends on the accuracy requirements and working conditions of the application.

40-Minute Vial – 5070-051-40

The SECO 5070-051-40 includes a 40-minute vial and provides a practical leveling reference for routine survey and construction applications.

Included vial:

• SECO vial p/n: D11232

This configuration is well suited for general prism-pole and field positioning where a straightforward visual indication of plumb is required.

20-Minute Vial – 5070-051-20

The SECO 5070-051-20 uses a more sensitive 20-minute vial.

Included vial:

• SECO vial p/n: D11143

The increased sensitivity makes smaller deviations from vertical easier to identify compared with the 40-minute version.

8-Minute Vial – 5070-051-08

The SECO 5070-051-08 is the most sensitive configuration in the series.

Included vial:

• SECO vial p/n: D11234

Its 8-minute sensitivity is suited for applications where more precise pole leveling is desired.

Helps Maintain a Plumb Survey Pole

A properly leveled pole helps position the prism, GNSS antenna, or other mounted equipment directly above the intended survey point.

This is particularly important during:

• GNSS observations
• Robotic total station measurements
• Construction stakeout
• Control surveys
• Topographic measurements
• Precise prism positioning

The vial provides a quick visual reference so the operator can correct the pole position before collecting a measurement.

Replaceable Vial Design

Each configuration uses an identified SECO replacement vial, allowing the leveling component to be replaced if it becomes damaged or worn.

Replacement vial part numbers are:

This serviceable design allows the pole assembly to remain in use without replacing the complete mounting component.

Mounting Screws Included

Each SECO 5070-051 assembly includes the screws required for installation.

The hardware should be tightened securely after mounting, and the vial should be checked for proper adjustment before precision survey work begins.

Available Models and Part Numbers

All three models use the same 1.50-inch OD pole fitment, with the vial sensitivity being the primary difference.

Choosing the Right Vial

8-Minute

Choose the 8-minute version when greater vial sensitivity is preferred for precision pole positioning.

20-Minute

The 20-minute version provides a middle ground between high sensitivity and easy field use.

40-Minute

The 40-minute version provides a straightforward leveling reference for general surveying and construction applications.

Ideal Applications

• Prism pole leveling
• GNSS rover rod leveling
• Construction layout
• Robotic total station surveying
• Survey stakeout
• Topographic surveying
• Boundary surveying
• Control-point work
• Antenna pole setups
• General survey pole leveling

Technical Specifications

What’s Included

Each selected configuration includes:

• 1 × SECO Pole Vial Assembly for 1.50-inch OD poles
• 1 × Corresponding vial
• Mounting screws

Available configurations:

• 5070-051-08 – 8-minute vial, includes vial p/n D11234
• 5070-051-20 – 20-minute vial, includes vial p/n D11143
• 5070-051-40 – 40-minute vial, includes vial p/n D11232

Survey pole and other surveying accessories are sold separately.

Vial Options for 1.50-Inch Survey Poles

The SECO 5070-051 series provides a simple leveling solution for 1.50-inch OD survey poles, with 8-, 20-, and 40-minute vial options available. Each model includes the correct replacement-style vial and installation screws, allowing crews to select the sensitivity best suited to their surveying or construction workflow.