Recommended Tooling for Bulgin’s 400 Series Power Connectors

When you are specifying a sealed circular connector for a harsh-environment application, the part number on the bill of materials tells only part of the story. The long-term reliability of that connection depends just as much on how it is assembled, so the right tooling becomes crucial.

Bulgin designs its 400 Series Power Connectors to deliver IP68-rated performance across a wide range of industrial, marine, and outdoor applications, but achieving that level of protection in the field requires crimp terminations that are consistent, repeatable, and mechanically sound.

To help you get there, Bulgin recommends using a specific set of hand tools that work together with the 400 Series to ensure that every contact is seated, crimped, and retained exactly as the datasheet intends.

A quick look at the 400 Series

Before examining the tooling, it helps to understand what the 400 Series (Figure 1) is built to do. As the smallest member of the Buccaneer family, the 400 Series accommodates cable diameters from 3 to 7 mm and offers pole counts from 2 to 12. The current and voltage ratings scale with pole count: 2 and 3 pole versions handle 8 A at 250 V, while 4, 6, and 8 pole versions are rated for 5 A at 125 V, and 10 and 12 pole versions carry 1 A at 50 V. All variants are sealed to IP68 protection when mated, with the rating verified through immersion testing at roughly 1.054 kg per square cm, or a 10 meter depth for two weeks. Mounting options include front panel, rear panel, PCB, flex, and flex in-line styles, and connectors are available in plug and socket versions across all body styles.

Figure 1: Bulgin’s 400 Series power connectors. (Image source: Bulgin)

Since the cable connectors ship without contacts pre-loaded, you need to crimp the appropriate pin or socket contacts onto your cable and insert them into the connector body. That two-step process is where the recommended tooling set comes in.

The crimp tool: getting your terminations right

The first and most critical tool in the recommended set is the crimp tool. Bulgin specifies the 14025 (Figure 2), an 8 indent crimp tool for use with 400 Series crimp contacts, which matters because the 8 indent geometry applies uniform pressure around the contact barrel, producing a gas-tight mechanical and electrical bond between the contact and the conductor. A poorly crimped contact can easily introduce resistance, heat, and eventual failure, so a tool that delivers repeatable crimps every time is a quiet but crucial contributor to long-term reliability. The crimp tool works in conjunction with a positioner, which is where the pole count matching begins.

Figure 2: The 14025, an 8 indent crimp tool for use with 12 Contact 400 Series Connectors. (Image source: Bulgin)

The crimp positioner: matching the contact to the pole count

The 400 Series uses three different crimp contact sizes to accommodate various pole counts and current ratings. The 2 and 3 pole versions use the larger 8 A contacts (SA3349 sockets and SA3350 pins), the 4, 6, and 8 pole versions use 5 A contacts (SA3347 sockets and SA3348 pins), and the 10 and 12 pole versions use 1 A contacts (SA3179 sockets / SA3180 pins). Each contact size needs its own positioner to hold the contact correctly in the crimp tool during the operation.

Bulgin color codes the positioners to match the contact family, which makes it easy to identify the right positioner for the connector you are building. That simple visual cue helps reduce the risk of mismatching tooling on a busy assembly bench, and it pairs naturally with the similarly color coded insertion and extraction tool described next.

The insertion and extraction tool: seating and servicing contacts

Once a contact has been crimped to the wire, it needs to be seated into the connector body in the correct position. Bulgin offers a dedicated insertion and extraction tool for this purpose, and like the positioner it is color coded by pole count and contact rating. The 2 and 3 pole 8 A variant is the blue 13027/2, the 4, 6, and 8 pole 5 A variant is the red 13027/1 (Figure 3), and the 10 and 12 pole 1 A variant is the green 13027. Using the tool designed for the specific contact size ensures the contact is driven into the insert to the correct depth without damaging the seal or the retention mechanism.

Figure 3: Insertion/extraction tool for use with 5 A connectors. (Image source: Bulgin)

The extraction side of the tool is equally valuable. If a contact needs to be replaced in the field, or a wire needs to be reworked during assembly, the same tool can safely remove the contact without cutting or destroying the connector body. For applications where downtime is costly, that level of serviceability is a practical advantage.

Matching the tooling to your build

When you are planning a build around the 400 Series, your workflow becomes easier once you know your pole count. Start by selecting the connector body style and pole count that suit your mechanical and electrical requirements, then order the matching crimp contacts in pin or socket form as needed. From there, the tooling choices follow directly: the 8 indent crimp tool paired with the positioner that matches your contact size, and the insertion/extraction tool that shares the same color code. Keeping a full set on the bench means you can assemble any 400 Series variant without swapping base tools, which is helpful in mixed production environments where you might be building 2 pole power connections one hour and 12 pole signal connections the next.

Why this matters for your end product

The 400 Series earned an IP68 rating in Bulgin’s test lab, but the rating only carries over to your product if the field termination matches the design intent. A correctly crimped contact seated at the right depth maintains the integrity of the internal seal, preserves the contact retention force specified in the datasheet, and avoids the kind of intermittent failures that are almost impossible to diagnose once a product is deployed.

To see the entire range of Bulgin’s 400 Series Power Connector body styles, pole counts, and accessories, as well as recommended tooling, visit the 400 Series Power Connectors product highlights page.