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.
CABLE TRY CLAMP, DIRECT BURIAL-6 SOL-1/0 STR

GTCDB1/0-L

CABLE TRY CLAMP, DIRECT BURIAL-6 SOL-1/0 STR
1/2 inch to 1 inch Brass Ground Clamp. Wire size #8 to #4. Bare/armored wire.

L181B-B1-15

1/2 inch to 1 inch Brass Ground Clamp. Wire size #8 to #4. Bare/armored wire.
Rack Cabinet Ground Kit

BWK6A12

Rack Cabinet Ground Kit
The LICC4-22-TL Copper Lay-In-Lug, one-hole, is used for quick installation of a continuous grounding conductor. The wide wire range-taking capability minimizes inventory requirements. Copper body lugs are UL Listed for direct burial in earth or concrete.

LICC4-22-TL

The LICC4-22-TL Copper Lay-In-Lug, one-hole, is used for quick installation of a continuous grounding conductor. The wide wire range-taking capability minimizes inventory requirements. Copper body lugs are UL Listed for direct burial in earth or concrete.
The LIAS250-56-X Tin-Plated Aluminum Lay-In-Lug, one-hole, is designed for quick installation of a continuous grounding conductors. The wide wire range-taking capability minimizes inventory requirements. UL Listed and temperature rated to 90 C.

LIAS250-56-X

The LIAS250-56-X Tin-Plated Aluminum Lay-In-Lug, one-hole, is designed for quick installation of a continuous grounding conductors. The wide wire range-taking capability minimizes inventory requirements. UL Listed and temperature rated to 90 C.
The LICC4-22TP-TL Tin-plated copper Lay-In-Lug, one-hole, is used for quick installation of a continuous grounding conductor. The wide wire range-taking capability minimizes inventory requirements. Copper body lugs are UL Listed for direct burial in earth or concrete.

LICC4-22TP-TL

The LICC4-22TP-TL Tin-plated copper Lay-In-Lug, one-hole, is used for quick installation of a continuous grounding conductor. The wide wire range-taking capability minimizes inventory requirements. Copper body lugs are UL Listed for direct burial in earth or concrete.
The CTAPR2/0-2-L Compression Connector Tap provides high-strength and premium electrical properties. It is suitable for use with solid and stranded copper Code conductors. Used for tapping conductor to conductor and conductor to ground rod applications. UL listed per UL486 for use suitable for direct burial in earth and concrete. UL 486A-486B Listed for wire to wire power applications up to 36kV and temperature rated 90C with select Panduit or industry standard crimp tools and crimp dies.

CTAPR2/0-2-L

The CTAPR2/0-2-L Compression Connector Tap provides high-strength and premium electrical properties. It is suitable for use with solid and stranded copper Code conductors. Used for tapping conductor to conductor and conductor to ground rod applications. UL listed per UL486 for use suitable for direct burial in earth and concrete. UL 486A-486B Listed for wire to wire power applications up to 36kV and temperature rated 90C with select Panduit or industry standard crimp tools and crimp dies.

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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