Custom DB25 cable
- Male, female, and mixed-gender DB25 combinations
- Straight and directional-exit molded cable options
- Customer-defined serial, parallel, or proprietary pin maps
- Bare-wire, flat-ribbon, and panel-mount configurations
- Shielding and shell-bonding choices for the installation
- Custom length, identification, hardware, and packaging
- Continuity, shorts, and pin-map inspection to the released drawing
Custom DB25 Cable Assemblies for Serial, Parallel, and Industrial I/O
The 25-position D-sub shell has supported many interfaces, including RS-232 equipment, legacy parallel peripherals, test systems, and manufacturer-specific control I/O. “DB25” therefore identifies a connector format, not a protocol or universal wiring map. BespokeCable manufactures each DB25 assembly to the two endpoint definitions, signal schedule, mechanical envelope, and revision you approve.
Available formats include standard and directional DB25 cables, bare-wire extensions, ribbon assemblies, and panel-mount tails. They cover equipment links, control-cabinet termination, internal chassis routing, and enclosure service ports. For other contact counts and mixed connector families, browse our D-Sub cable collection.
Technical Specifications
| Parameter | Available Specification |
| Connector family | 25-position D-sub; DB-25 |
| Gender | Male or female at either end |
| Product formats | DB25-to-DB25, bare-wire, flat-ribbon and panel-mount tail |
| Cable exit | Straight, up or down options shown below; orientation defined on the drawing |
| Wiring | 1:1, serial, parallel, partial population or approved proprietary map |
| Backshell | Molded assembly, specified hood or panel-mount construction |
| Shielding | Unshielded, foil, braid or combined shielding as specified |
| Retention | Mating screws, jack screws or panel hardware to drawing |
| Length | Standard or custom, subject to interface and installation review |
| Identification | Printed label, heat-shrink ID, customer part number and OEM packing |
| Inspection | Visual, continuity, shorts, and pin-map checks to the released specification |
Confirm the final conductor, jacket, plating, dimensions, signal suitability, electrical limits, and compliance documents on the quotation or controlled drawing.
Click here to find more information about: What is a DB25 Cable?
1# Standard and Directional DB25 Cables
P/N: BC-CBD003-MM
Straight male-to-male DB25 assembly; define the interface and pin map.
P/N: BC-CBD003-MF
Straight male-to-female DB25 assembly for a controlled extension or equipment link.
P/N: BC-CBD003-FF
Straight female-to-female cable with project-specific signal mapping.
P/N: BC-CBD003-UMM
Male-to-male DB25 cable with an upward exit, as defined from an approved view.
P/N: BC-CBD003-DMM
Directional male-to-female DB25 cable with a downward exit, as defined from an approved view.
2# DB25 Bare-Wire Extension Cables
P/N: BC-CBD003-MT
Male DB25 to flying leads; define the populated pins, colors, breakout length, and wire-end finish.
P/N: BC-CBD003-FT
Female DB25 to flying leads for controlled cabinet or equipment termination.
3# DB25 Ribbon Cables
P/N: BC-CBD003-MM-RR
Color-coded flat-ribbon assembly with male DB25 connectors at both ends.
P/N: BC-CBD003-MF-RR
Male-to-female flat-ribbon cable for protected internal equipment routing.
P/N: BC-CBD003-FF-RR
Female-to-female flat-ribbon assembly with pin-1 orientation controlled on the drawing.
4# Panel-Mount DB25 Cables
P/N: BC-CBD003-FM-RG
Male panel-mount DB25 tail for an enclosure or equipment service interface.
P/N: BC-CBD003-FF-RG
Female panel-mount DB25 tail; define flange side, panel thickness, and internal termination.
P/N: BC-CBD002-FF-RG-P
Bracketed panel-mount DB25 assembly for a mechanically controlled enclosure installation.
Specify the Interface Behind the DB25 Connector
A DB25 shell can appear on serial equipment, a parallel printer connection, or a proprietary multi-signal port. Those applications don’t share a universal connection map. The connector gender and a “25-pin” description tell us what must mate, but not what may safely be connected.
Begin with the two equipment models and port functions. A DB25-to-CN36 cable is a separate option for an appropriate parallel printer interface; it should not be substituted for an RS-232 connection because one end looks familiar.
Fit the Cable Format to the Assembly Task
Molded DB25 cables suit finished equipment links, while bare-wire versions let you terminate circuits at a terminal strip or fixture. Ribbon constructions address protected internal routing. Panel-mount versions bring a connection to the enclosure wall without requiring the internal electronics to sit directly behind the cutout.
Directional exits can help with restricted depth, but must be specified from an agreed connector view. Check the full hood and bend envelope, including the space needed to operate the mating screws. The shortest-looking exit is not necessarily the easiest one to install or service.
Match the Cable Construction to the Signal Schedule
Twenty-five contacts do not necessarily mean twenty-five identical circuits. A custom harness may combine data, control lines, returns, and intentionally unused positions. Conductor size, grouping, and shielding should follow that schedule and the connected equipment’s requirements.
An overall shield does not guarantee that all internal circuits are isolated from one another. Provide any pair, individual-screen, or separation requirements explicitly. We can review the proposed cable and hood together, since adding conductors or shielding changes the bundle diameter and the available termination space.
Plan for Handling and Maintenance
A service lead that is regularly unplugged needs different attention than a harness secured inside a cabinet. Discuss grip access, screw retention, strain relief, and the point where the cable is supported. The connector should not carry the weight or pulling force of an unsupported cable run.
For a bare-wire build, define how technicians will identify and terminate each circuit. For an external lead, consider a durable equipment-end label. Neither a plated contact nor a reinforced boot alone establishes an environmental or mating-cycle rating; those requirements need a documented component and assembly specification.
This can be evaluated. Provide the quantity by part number, individual labeling, bag labeling, and carton-separation rules so that receiving can distinguish them safely.
Review project-specific barcode or serial labels. Supply the data structure, size, position, and scan-verification requirements.
Evaluate an alternative against the mating interface and installation dimensions. Approve any difference that affects fit or performance before releasing the new component.
Related Products
Replacing a Legacy DB25 Cable When Records Are Incomplete
Separate the working reference from the failed part
If you have both a failed cable and a working example, label them before evaluation. Note repairs, added adapters, and any configuration changes around the time the fault appeared. A fault in an old assembly should not be reproduced as part of its design.
Photograph the complete installed connection, including intermediate hardware. An inline adapter may perform a crossover that is absent from the main cable, so testing only the long lead can produce an incomplete replacement map.
Reconstruct the design in stages
First establish the mating geometry and mechanical route. Then compare the measured connection table with the equipment documents. Where the two disagree, pause that part of the specification for equipment-owner review instead of treating the sample as unquestionable authority.
Record how length is measured and which installation dimensions are critical. This is particularly useful for panel and flying-lead versions, where overall length alone says little about whether each end will reach its intended connection.
Prove the replacement under normal use
A continuity check confirms the manufactured connections, but application testing confirms whether those connections serve the system. Exercise the relevant operating modes, not only a power-on check. For a printer, this can include status and recovery behavior; for an instrument, it can include the commands and return signals used in the actual process.
Keep the accepted test record with the released drawing. This gives future maintenance staff a replacement definition they can verify instead of another visually similar cable they must investigate.
Information for Your Quotation
Please include:
- Equipment make, model, and purpose of each DB25 port
- Connector gender, screw hardware, and viewing orientation
- Complete source-to-destination pin map with signal names
- Cable length, quantity, and measurement reference points
- Required straight or directional exit and surrounding clearance
- Molded, bare-wire, ribbon, or panel-mount construction
- Shield, drain, and shell-bonding requirements
- Flying-lead colors, breakout, strip length and end treatment
- Panel drawing, thickness and mounting direction where applicable
- Labels, packaging, documentation and revision requirements
