SECO 6402-20 Rear Locking 62mm Premier Prism Assembly with 6 × 9 in Target

Overview

The SECO Rear Locking 62 mm Premier Prism Assembly is a professional total station prism system designed for accurate layout, control, and surveying work. Built with a heavy-duty 62 mm silver-coated prism sealed inside a durable canister, this assembly is made to perform reliably in tough field conditions.

This model features a simple stainless steel rear locking mechanism that is easy to set while adjusting the prism and target tilt. The large 6 × 9 inch target improves visibility at longer distances, making it a strong choice for construction layout, boundary work, and general total station applications.

Available Models

• Part Number: 6402-20-FOB – Flo Orange with Black Target
• Part Number: 6402-20-YLB – Yellow with Black Target
• Part Number: 6402-20-FLB – Flo Yellow with Black Target

Key Features

• 62 mm silver-coated prism
• Prism offset: 0 mm or -30 mm
• Heavy-duty prism sealed in a strong canister
• O-ring sealed to help prevent water and dust intrusion
• Simple stainless steel rear locking mechanism
• Easy prism and target tilt adjustment
• Large 6 × 9 inch target
• Available in Flo Orange/Black, Yellow/Black, or Flo Yellow/Black
• Tilting axis height: 115 mm
• Weight: 1.75 lb (0.79 kg)

Built for Accurate Total Station Work

The 62 mm prism provides reliable reflector performance for everyday surveying and construction measurement tasks. Its larger target makes sighting easier in the field, especially on larger sites or when working at longer distances.

Ideal for:

• Construction layout and staking
• Boundary and land surveying
• Control point measurements
• Topographic surveys
• General total station workflows

Rear Locking Design

The rear locking mechanism allows crews to quickly secure the prism and target tilt from the back of the assembly. This makes adjustments simple while helping keep the target firmly positioned during measurement work.

The stainless steel mechanism is built for daily field use and adds durability to the overall prism assembly.

Flexible 0 mm or -30 mm Offset

This prism assembly can be mounted in either 0 mm or -30 mm offset positions, allowing crews to match common prism constants used across different total station brands and field workflows.

This flexibility makes it a practical option for crews using mixed instrument fleets or switching between different prism settings.

What’s Included

• 62 mm silver-coated prism
• Rear locking prism holder
• 6 × 9 inch target in selected color