The Spectra Precision C61 is the OEM rod clamp assembly engineered specifically for use with the HR150U and HR220 handheld laser receivers. Whether you're replacing a worn or lost clamp on a working receiver or stocking a spare for the job box, the C61 delivers the same secure, tool-free mounting performance that contractors rely on for elevation work, grade checks, and layout day in and day out. As an authorized Spectra Precision dealer, Express Tools supplies genuine replacement hardware so your receiver stays properly seated on the rod — not improvised with zip ties or duct tape.
Overview: What the C61 Does on the Job
The C61 clamp assembly attaches your HR150U or HR220 laser receiver firmly to grade rods, leveling rods, story poles, and forming stakes. A properly functioning clamp keeps the receiver positioned at the correct height while you're reading grade, checking fill elevation, or setting forms — and lets you slide and reposition the receiver quickly without fumbling for tools. On active construction sites, the clamp is one of the first components to take damage from drops, heavy mud contact, and rough handling between trades. The C61 is the correct factory replacement that restores full functionality without compromising the fit or the receiver's secure hold on the rod.
Key Specifications
- Model: Spectra Precision C61
- Compatible Receivers: HR150U, HR220
- Mounting Type: Rod clamp assembly with tool-free adjustment
- Designed For: Grade rods, leveling rods, story poles, and forming stakes
- OEM Part: Yes — genuine Spectra Precision replacement hardware
- Condition: New
Key Features
- Secure, wobble-free grip on standard contractor grade rods and story poles
- Tool-free tightening and height adjustment for fast positioning in the field
- OEM fit — designed and tested to work with HR150U and HR220 receiver housings
- Durable construction suited to repeated jobsite use in dirt, mud, and wet conditions
- Compact and lightweight — easy to carry as a backup in any tool bag
- Restores full receiver functionality when original clamp is damaged or missing
Job Applications
Grade Checking During Earthwork: Keep your HR150U or HR220 locked at the correct rod height while an operator checks cut and fill elevations. The C61 clamp holds the receiver steady on the rod so your grade readings stay accurate even on rough terrain.
Concrete Form Setting: Slide the receiver up and down the story pole quickly to hit your form elevation and lock it in place. The tool-free clamp design saves time when you're setting multiple form sections in sequence.
Site Layout and Elevation Transfer: Use the C61-mounted receiver on a leveling rod to transfer benchmark elevations across a site. The firm rod grip prevents the receiver from drifting between readings.
Utility and Pipe Grade Work: Clip your receiver to a grade rod in a trench or excavation and dial in the required pipe slope. The C61 holds position while you work, without requiring a second set of hands to stabilize the rod setup.
Compatible Accessories
- Spectra Precision HR150U Handheld Laser Receiver
- Spectra Precision HR220 Handheld Laser Receiver
- Spectra Precision LL300N Self-Leveling Laser Level
- Spectra Precision HV302 Rotating Laser Level
- Contractor Grade Rod — Fiberglass, 13 ft
Related Guides
- How to Mount a Laser Receiver to a Grade Rod
- Spectra Precision HR150U vs HR220: Which Receiver Is Right for Your Job?
- Laser Receiver Troubleshooting: Common Field Issues and Fixes
- Jobsite Laser Level Accessories Guide
Frequently Asked Questions
- Is the C61 clamp compatible with receivers other than the HR150U and HR220?
- The C61 is designed and spec'd specifically for the Spectra Precision HR150U and HR220 handheld laser receivers. It may not fit other Spectra receiver models or third-party receivers due to differences in housing geometry and clamp attachment points. Check your receiver model before ordering.
- Can I use the C61 on a fiberglass grade rod and an aluminum story pole?
- Yes. The C61 clamp assembly is suitable for standard contractor-grade rods and story poles regardless of material — fiberglass, aluminum, or wood — as long as the rod diameter falls within the clamp's range. Most standard contractor rods are compatible.
- What if my receiver is functional but the clamp arm is cracked or the tightening mechanism is stripped?
- That's exactly the use case the C61 is designed for. Rather than replacing a fully functional HR150U or HR220 receiver, you can restore it with a new OEM clamp assembly at a fraction of the cost. It's one of the most cost-effective repairs in the field.
- Does the C61 ship quickly from Express Tools?
- Yes. Express Tools ships in-stock items fast, and the C61 qualifies for free shipping. If you're mid-project and need a replacement clamp, check current availability on the product page or contact our team directly for lead time confirmation.
