The Andrew GKT-L4SG is a grounding kit preparation tool for 1/2 in corrugated coaxial cable. It strips 1.5 in (38 mm) of jacket so an Andrew SG-series or CSG-series grounding kit can be attached. Each tool includes one steel cutting blade rated for 150 cable preparations. Andrew, formerly sold under the CommScope name, makes it for the HELIAX® product line.
Manufacturer part number: GKT-L4SG. Also searched as GKTL4SG, GKT L4SG and CommScope GKT-L4SG.
Andrew GKT-L4SG specifications
| Manufacturer | Andrew (an Amphenol company), formerly CommScope |
|---|---|
| Part number | GKT-L4SG |
| Product type | Tool |
| Tool type | Grounding kit preparation tool |
| Application | Prepares cable for grounding kit attachment |
| Nominal cable size | 1/2 in corrugated cable |
| Jacket removed | 1.5 in (38 mm) |
| Grounding kits | SG-series and CSG-series |
| Cutting blades included | 1 |
| Cutting blade life | 150 cable preparations |
| Replacement blade kit | GBK-SG1278 |
| Material | Aluminum and steel |
| Packed dimensions | 3.1 in H x 0.9 in W x 0.9 in L (78.74 x 22.86 x 22.86 mm) |
| Gross weight | 0.926 lb (0.42 kg) |
| Package quantity | 1 |
| Compliance | RoHS, UK RoHS, China RoHS (below maximum concentration value), REACH-SVHC, ISO 9001:2015 |
Grounding kits for 1/2 in cable
Andrew lists these 1/2 in kits for use with the GKT-SG series tools.
| Kit | Description |
|---|---|
| SG12-06B2A | SureGround grounding kit for 1/2 in coaxial cable |
| SG12-12B2U | SureGround grounding kit for 1/2 in coaxial cable |
| CSG12-06B1A | SureGround Universal Compact grounding kit for 1/2 in corrugated and smoothwall coaxial cable |
| CSG12-12B2U | SureGround Universal Compact grounding kit for 1/2 in corrugated and smoothwall coaxial cable |
Choose the right Andrew grounding kit tool
- 1/2 in corrugated cable with SG or CSG kits: GKT-L4SG (this tool).
- Other sizes with SG or CSG kits: GKT-78SG for 7/8 in, GKT-114SG for 1-1/4 in, GKT-158SG for 1-5/8 in.
- SGL-series kits: Andrew pairs these with its GKT-series jacket strippers, such as the GKT-L4A for 1/2 in cable, which remove 2.25 in of jacket. Do not substitute the GKT-L4SG.
Replacement blade
The GBK-SG1278 replacement blade kit fits the GKT-L4SG and the GKT-78SG. It is a single steel blade, also rated for 150 cable preparations.
Safety and use
- The cable must be straight before you use the tool.
- Handle the tool carefully to avoid accidental contact with the cutter blade.
- Do not attempt grounding kit installation in the presence of thunderstorms. Andrew warns that failure to obey this may result in injury or death.
- Andrew writes its installation instructions for qualified, trained personnel.
Manufacturer documents
- GKT-L4SG product specifications (PDF, revised August 21, 2024)
- Jacket stripping tool installation instructions, bulletin 237663 (PDF)
- SureGround grounding kit installation instructions, bulletin 7598195 (PDF)
- Andrew GKT-L4SG product page
- RoHS and REACH statement of compliance
- ANDREW terms, conditions and warranty
About Andrew and the CommScope name
ANDREW was founded in 1937 and was acquired by CommScope in 2007. Amphenol completed its acquisition of CommScope's Outdoor Wireless Networks and Distributed Antenna Systems businesses in February 2025, and those businesses now operate as ANDREW, an Amphenol company. GKT-L4SG is the same part number on Andrew's current product page and on the older CommScope datasheets.
Frequently asked questions
What does the Andrew GKT-L4SG do?
It prepares 1/2 in corrugated coaxial cable for an SG-series or CSG-series grounding kit by removing 1.5 in (38 mm) of the outer jacket. It includes one steel cutting blade rated for 150 cable preparations.
What cable size does the GKT-L4SG fit?
It fits 1/2 in corrugated cable. Andrew lists its 1/2 in HELIAX LDF4-50A corrugated copper coax among related products. For 7/8 in cable use the GKT-78SG, for 1-1/4 in cable the GKT-114SG, and for 1-5/8 in cable the GKT-158SG.
Which grounding kits does it work with?
Andrew's SG-series and CSG-series grounding kits. For 1/2 in cable that includes the SG12-06B2A, SG12-12B2U, CSG12-06B1A and CSG12-12B2U.
Can I use the GKT-L4SG with SGL-series grounding kits?
No. Andrew bulletin 237663 pairs SGL-series kits with its GKT-series jacket strippers, such as the GKT-L4A for 1/2 in cable, which remove 2.25 in of jacket. The GKT-SG series tools, including the GKT-L4SG, remove 1.5 in and are for SG-series kits.
Is the CommScope GKT-L4SG the same as the Andrew GKT-L4SG?
Yes. It is the same part number. Amphenol completed its acquisition of CommScope's outdoor wireless business in February 2025, and these products now carry the Andrew name. The core specifications match between CommScope's 2012 datasheet and Andrew's current one.
How long does the cutting blade last, and how do I replace it?
One blade is rated for 150 cable preparations. The replacement blade kit is the GBK-SG1278, which fits both the GKT-L4SG and the GKT-78SG.
Does the GKT-L4SG include a grounding kit?
No. It is a preparation tool only and includes one cutting blade. Grounding kits are sold separately.
What safety precautions apply?
Andrew's bulletins say the cable must be straight before you use the tool, and the cutter blade must be handled carefully to avoid accidental contact. Andrew also warns against installing grounding kits during a thunderstorm, which can result in injury or death.
Is the GKT-L4SG RoHS compliant?
Yes. Andrew lists it as RoHS compliant and UK RoHS compliant, with China RoHS below the maximum concentration value and REACH-SVHC compliant.
Specifications on this page were checked against Andrew's current product page, its datasheet revised August 21, 2024, and installation bulletins 237663 and 7598195. Last reviewed October 2026.
