HKS Ratcheting Crimper for U-Shaped Terminals: A Practical Tool for Wire Connections from 20 to 10 AWG
The HKS crimping tool for non-insulated open barrel terminals is a ratcheting hand tool designed to work with U-shaped connectors and receptacles in the AWG 20-10 range (0.5 to 6 mm²). It is a specialized piece of equipment meant for electrical work where secure, repeatable crimps are needed on uninsulated terminals. While it may look like a standard pliers-style crimper, the ratcheting mechanism sets it apart, providing consistent pressure until the handle is fully cycled.
In practice, this tool is used in automotive wiring, appliance repair, or small-scale electrical projects where you need to attach ring, spade, or bullet connectors to stranded wire. The U-shaped die accommodates open barrel terminals, which are common in many aftermarket wiring kits. The ratchet ensures that the crimp is not released prematurely, which can happen with simple pliers if you lose grip or get distracted. Once you start squeezing, the tool locks and only opens when the crimp is complete, which reduces the chance of under-crimping.
The build quality is adequate for light to moderate use. The handles are covered with a rubberized grip that provides some comfort, though they are not heavily padded. The tool body is steel, and the dies are machined to match the terminal sizes. There are clearly marked positions on the die for AWG 20-18, 16-14, and 12-10, which helps you select the right cavity quickly. However, the markings are stamped and can be hard to read in dim light, so you may need to memorize the order.
Key functional features include the ratcheting mechanism, which provides a mechanical advantage and consistent crimp depth. The dies are U-shaped to match the terminal profile, and the tool can handle both bare wire and tinned wire without issues. The handle length gives decent leverage, so you do not need excessive hand strength to crimp larger 10 AWG wire. The tool also includes a built-in wire cutter and a bolt cutter near the hinge, which is a nice addition for trimming excess screws or studs.
One limitation is that this tool is only for non-insulated open barrel terminals. If you work with insulated connectors, nylon or vinyl closed barrel types, or coaxial cable, this crimper will not be suitable. The U-shaped die also means it does not work well with solid core wire, as the crimp may not be as secure. Additionally, the ratchet can feel stiff when new, and it may take a few dozen crimps to break it in. Some users report that the tool leaves a slight indentation on the terminal if not aligned perfectly, so you need to position the connector squarely in the die.
Compared to a generic pliers-style crimper, the HKS ratcheting tool offers more consistency and less hand fatigue for repetitive work. A simple pliers crimper costs less and is more versatile for different terminal types, but it relies on your feel and can produce uneven results. For someone doing a handful of connections occasionally, a basic crimper may be enough. For those wiring a fuse block or building a harness with many terminals, the ratchet feature is worth the extra cost.
- Who it is for: Hobbyists, auto electricians, and technicians who regularly crimp uninsulated U-shaped terminals on stranded wire from 20 to 10 AWG. It is also good for anyone who wants repeatable crimps without guessing the pressure.
- Who it is not for: Professionals working with insulated terminals, coaxial connectors, or solid core wire. It is also not ideal for very high volume production work, as a hydraulic or pneumatic crimper would be faster.
The tool does not include a carrying case or additional dies, which is typical at this price point. The wire cutter works adequately but may struggle with thicker multi-strand cables. Overall, the HKS crimper performs its intended task reliably, but it is a specialized tool with clear boundaries. If your work matches its design, it will save you time and frustration. If you need more versatility, look for a crimper with interchangeable die sets.