NSI Industries GRC-50 - We built the NSI GRC-50 Standard Duty Silicon Bronze Grounding Rod Clamp for demanding applications including direct burial, where the simple mechanical design and reliable clamping power of the screw outperform other options. The GRC-50 Grounding Rod Clamp fits over 1/2" grounding rod and 3/8" rebar with room to tighten the clamping screw onto a range of 10 AWG solid to 2 AWG stranded conductors. GRC-family clamps with the -SB suffix have a body and screw made from silicon bronze for maximum strength, and the clamp is UL-listed for direct burial in earth or concrete. Stock products you can rely on—stock NSI.
NSI Industries

GRC-50

UPC: 662381010513

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Overview

The NSI GRC-50 Standard Duty Silicon Bronze Grounding Rod Clamp (SKU: GRC-50) is a UL-listed grounding solution for direct burial in earth or concrete, meeting stringent safety and performance standards. Engineered for 1/2" grounding rods and 3/8" rebar, the clamp accommodates conductors ranging from 10 AWG solid to 2 AWG stranded, providing versatility for various grounding applications. Its silicon bronze body and screw deliver maximum strength and superior corrosion resistance, outperforming standard clamps in harsh, corrosive environments. The mechanical screw clamp design ensures a secure, long-term connection that resists loosening over time, even under demanding conditions. Unlike compression or crimp-style clamps, the GRC-50’s simple yet robust mechanical design simplifies installation and maintenance while maintaining reliable performance. Certified for direct burial in both earth and concrete, the GRC-50 is ideal for industrial, utility, and construction applications where durability, compliance, and long-term reliability are critical. With a focus on practical performance, the GRC-50 eliminates the need for specialized tools or complex installation procedures, making it a dependable choice for professionals. NSI Industries’ GRC-50 is in stock and ready for immediate deployment, ensuring quick availability for critical grounding projects.
  • Standard Duty: Don’t be fooled, when ordered with a suffix of -SB, these standard duty silicon bronze clamp bodies and tightening screw are durably strong in demanding environments
  • Range of Sizes: Clamp body fits over 1/2" grounding rods and 3/8" rebar, with room to tighten the clamping screw onto a range of 10 AWG solid to 2 AWG stranded conductors
  • Simple Design: The simple mechanical design features only a tightening screw and a clamp body, making this an ideal choice for heavy-duty buried grounding
  • Direct Burial: The reliable NSI grounding and bonding products meet or exceed UL performance standards for direct burial in earth or concrete
  • Mechanical screw clamp ensures reliable, long-term connections

Specifications

Application
Grounding Wire
Clamp Material
10 SOL - 2 STR
Connection Type
Screw
Connection Type
Screw Clamp
Insulation Material
Silicon Bronze
Material
Silicon Bronze
Material
Brass
Mounting Type
Direct Burial
Series
GRC
Size
1/2 Inch
Size
Fits 1/2" grounding rod and 3/8" rebar
Size
1/2" grounding rod, 3/8" rebar
Special Features
1/2 Ground Rod Clamp - Stainless Steel Hardware IN
Standard
UL467
Type
Ground Rod Clamps Standard Duty
Warranty
1 yr
Package Dimensions (L x W x H)
0.62 IN x 0.79 IN x 1.2 IN
Package Dimensions (L x W x H)
15.748 mm x 20.066 mm x 3.048 cm
Package Weight (Imperial)
0.114 L
Package Weight (Metric)
0.052 kg
The NSI G-1-SDB Heavy Duty Bronze Ground Clamp for Direct Burial grips on pipes between 1/2" to 1" in diameter and is suitable for direct burial applications. The 304 stainless steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. UL Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.

G-1-SDB

The NSI G-1-SDB Heavy Duty Bronze Ground Clamp for Direct Burial grips on pipes between 1/2" to 1" in diameter and is suitable for direct burial applications. The 304 stainless steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. UL Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.
The NSI G-1-SDBR Heavy Duty Bronze Ground Clamp for Direct Burial grips on pipes between 1/2" to 1" in diameter and rebar from 3/8" to 1" in diameter for quick and easy wire grounding. Suitable for direct burial, this ground clamp comes with 304 stainless steel screws and a cast bronze clamp body. These economical, high-quality metals provide durable performance in a range of applications. cULus Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.

G-1-SDBR

The NSI G-1-SDBR Heavy Duty Bronze Ground Clamp for Direct Burial grips on pipes between 1/2" to 1" in diameter and rebar from 3/8" to 1" in diameter for quick and easy wire grounding. Suitable for direct burial, this ground clamp comes with 304 stainless steel screws and a cast bronze clamp body. These economical, high-quality metals provide durable performance in a range of applications. cULus Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.
The NSI G-6-S Bronze Ground Clamp for Water Pipe, grips on water pipes between 4-1/2" to 6" in diameter for quick and easy assembly. The zinc-plated steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to easily bond bare copper wire to a water pipe or for use as a water meter shunt. cULus Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.

G-6-S

The NSI G-6-S Bronze Ground Clamp for Water Pipe, grips on water pipes between 4-1/2" to 6" in diameter for quick and easy assembly. The zinc-plated steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to easily bond bare copper wire to a water pipe or for use as a water meter shunt. cULus Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.
The NSI G-2-S Bronze Ground Clamp for Water Pipe grips on water pipes between 1-1/4" to 2" in diameter for quick and easy assembly. The zinc-plated steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to easily bond bare copper wire to a water pipe or for use as a water meter shunt. cULus Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.

G-2-S

The NSI G-2-S Bronze Ground Clamp for Water Pipe grips on water pipes between 1-1/4" to 2" in diameter for quick and easy assembly. The zinc-plated steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to easily bond bare copper wire to a water pipe or for use as a water meter shunt. cULus Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.
The NSI G-2 Heavy Duty Bronze Ground Clamp for Water Pipe grips on water pipes between 1-1/4" to 2" in diameter with its serrated body. The zinc-plated steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to quickly and easily ground wires to water pipes with the included set screw. Designed for use alone or with heavy-duty bronze adapters. UL Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.

G-2

The NSI G-2 Heavy Duty Bronze Ground Clamp for Water Pipe grips on water pipes between 1-1/4" to 2" in diameter with its serrated body. The zinc-plated steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to quickly and easily ground wires to water pipes with the included set screw. Designed for use alone or with heavy-duty bronze adapters. UL Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.
The NSI G-2-SDB Heavy Duty Bronze Ground Clamp for Direct Burial grips on pipes between 1-1/4" to 2" in diameter and is suitable for direct burial applications. The 304 stainless steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. UL Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.

G-2-SDB

The NSI G-2-SDB Heavy Duty Bronze Ground Clamp for Direct Burial grips on pipes between 1-1/4" to 2" in diameter and is suitable for direct burial applications. The 304 stainless steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. UL Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.
The NSI G-4-S Bronze Ground Clamp for Water Pipe grips on water pipes between 2-1/2" to 4" in diameter for quick and easy assembly. The zinc-plated steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to easily bond bare copper wire to a water pipe or for use as a water meter shunt. UL Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.

G-4-S

The NSI G-4-S Bronze Ground Clamp for Water Pipe grips on water pipes between 2-1/2" to 4" in diameter for quick and easy assembly. The zinc-plated steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to easily bond bare copper wire to a water pipe or for use as a water meter shunt. UL Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.
The NSI G-4-SBS Direct Burial Bronze Ground Clamp grips on water pipes between 2-1/2" to 4" in diameter for quick and easy bonding in direct burial applications. The copper alloy screws and bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to easily bond bare copper wires up to 2 AWG to water pipes, rebar and ground rods. UL Listed for direct burial in both earth and concrete and well as UL listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.

G-4-SBS

The NSI G-4-SBS Direct Burial Bronze Ground Clamp grips on water pipes between 2-1/2" to 4" in diameter for quick and easy bonding in direct burial applications. The copper alloy screws and bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to easily bond bare copper wires up to 2 AWG to water pipes, rebar and ground rods. UL Listed for direct burial in both earth and concrete and well as UL listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.
We built the NSI GRC-100H Heavy Duty Silicon Bronze 1" Ground Clamp for demanding applications including direct burial, where the simple mechanical design and reliable clamping power of the screw outperform other options. GRC-family clamps with the -SB suffix have a body and screw made from silicon bronze for maximum strength, and the clamp is UL-listed for direct burial in earth or concrete. Stock products you can rely on—stock NSI.

GRC-100H

We built the NSI GRC-100H Heavy Duty Silicon Bronze 1" Ground Clamp for demanding applications including direct burial, where the simple mechanical design and reliable clamping power of the screw outperform other options. GRC-family clamps with the -SB suffix have a body and screw made from silicon bronze for maximum strength, and the clamp is UL-listed for direct burial in earth or concrete. Stock products you can rely on—stock NSI.
We built the NSI GRC-58 Standard Duty Silicon Bronze Grounding Rod Clamp for demanding applications including direct burial, where the simple mechanical design and reliable clamping power of the screw outperform other options. The GRC-58 Grounding Rod Clamp fits over 5/8" grounding rod and 1/2" rebar with room to tighten the clamping screw onto a range of 10 AWG solid to 2 AWG stranded conductors. GRC-family clamps with the -SB suffix have a body and screw made from silicon bronze for maximum strength, and the clamp is UL-listed for direct burial in earth or concrete. Stock products you can rely on—stock NSI.

GRC-58

We built the NSI GRC-58 Standard Duty Silicon Bronze Grounding Rod Clamp for demanding applications including direct burial, where the simple mechanical design and reliable clamping power of the screw outperform other options. The GRC-58 Grounding Rod Clamp fits over 5/8" grounding rod and 1/2" rebar with room to tighten the clamping screw onto a range of 10 AWG solid to 2 AWG stranded conductors. GRC-family clamps with the -SB suffix have a body and screw made from silicon bronze for maximum strength, and the clamp is UL-listed for direct burial in earth or concrete. Stock products you can rely on—stock NSI.
The NSI G-1 Heavy Duty Bronze Ground Clamp for Water Pipe with Brass Screws grips on water pipes between 1/2" to 1" in diameter with its serrated body. The brass screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to quickly and easily ground wires to water pipes with the included set screw. Designed for use alone or with heavy-duty bronze adapters. UL Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.

G-1BS

The NSI G-1 Heavy Duty Bronze Ground Clamp for Water Pipe with Brass Screws grips on water pipes between 1/2" to 1" in diameter with its serrated body. The brass screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to quickly and easily ground wires to water pipes with the included set screw. Designed for use alone or with heavy-duty bronze adapters. UL Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.
The NSI G-40BS 4/0 Armored Wire Adapter for Ground Clamps offers a convenient solution when grounding armored cable alongside interchangeable NSI ground clamps. The brass screws and bronze adapter body are made of economical, high-quality metals that provide durable performance in a range of applications. Adapter swing 360 degrees to make alignment simple and install from any direction. Use this adapter with NSI ground clamps to easily ground 4/0 armored cable to water pipes in indoor applications. Stock products you can rely on—stock NSI.

G-40BS

The NSI G-40BS 4/0 Armored Wire Adapter for Ground Clamps offers a convenient solution when grounding armored cable alongside interchangeable NSI ground clamps. The brass screws and bronze adapter body are made of economical, high-quality metals that provide durable performance in a range of applications. Adapter swing 360 degrees to make alignment simple and install from any direction. Use this adapter with NSI ground clamps to easily ground 4/0 armored cable to water pipes in indoor applications. Stock products you can rely on—stock NSI.

Frequently Asked Questions

Is the GRC-50 clamp UL Listed?

Yes, the GRC-50 clamp is UL Listed for direct burial in earth or concrete.

Can GRC-50 be used for direct burial?

Yes, the GRC-50 is UL Listed for direct burial applications.

What materials are used in the GRC-50 clamp?

The GRC-50 clamp is made from silicon bronze with zinc plated steel screws.

What is the ground rod size compatible with GRC-50?

The GRC-50 is compatible with a ground rod size of 1/2 inch.

What is the maximum ground wire size for GRC-50?

The GRC-50 can accommodate a maximum ground wire size of 10 SOL or 2 STR.

What type of screws are used in GRC-50?

The GRC-50 uses zinc plated steel screws for maximum strength.

Is GRC-50 compatible with rebar?

The GRC-50 is compatible with rebar size of 3/8 inch.

What is the standard carton quantity for GRC-50?

The standard carton quantity for the GRC-50 is 25 units.

What is the weight of the GRC-50 clamp?

The document does not specify the weight of the GRC-50 clamp.

What is the temperature range for GRC-50 operation?

The document does not provide specific temperature range information for the GRC-50.

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