Technical Guide
Deutsch connector size can mean several different things: the size of the electrical contact, the number of positions in the housing, the wire gauge accepted by a terminal or the physical size of the connector itself.
These measurements are related, but they are not interchangeable. A Size 16 contact, for example, does not mean 16 AWG wire, a 16-position connector or a particular housing dimension.
This guide explains the differences so you can identify the correct connector family, contact and housing without confusing contact size, wire size, cavity count and physical connector dimensions.
Quick Recommendation
When choosing a Deutsch connector, separate these four questions:
| Sizing Question | What It Describes | Example |
|---|---|---|
| Contact size | The electrical pin or socket interface used by the connector. | Size 20, 16, 12, 8 or 4. |
| Wire size | The conductor size supported by the exact terminal. | 16-20 AWG on a particular Size 16 contact. |
| Number of positions | The number of electrical circuits or contact cavities in the housing. | 2-way, 4-way, 6-way or 12-way. |
| Housing / shell size | The physical connector body or shell configuration. | Varies by family and exact housing. |
Start by determining the electrical and circuit requirements, then choose the connector family and exact housing. Do not use any one of these measurements as a substitute for the others.
What Does Deutsch Connector Size Mean?
In many Deutsch specifications, a designation such as Size 20, Size 16 or Size 12 refers to the contact size, not the outer dimensions of the connector.
The contact is the conductive pin or socket attached to the wire. Larger electrical loads generally use physically larger contacts, although the numbering runs in the opposite direction: Size 12 is larger than Size 16, and Size 8 is larger than Size 12.
This is why two connectors can have the same number of cavities but use completely different contacts. A 2-way DTM connector and a 2-way DTP connector are both two-position housings, but their contact systems are not the same.
If you are still choosing between connector families rather than trying to understand sizing terminology, use the DT vs DTM vs DTP comparison.
Deutsch Contact Size Chart
The table below shows the main Deutsch contact sizes and their published typical current ratings. Treat these values as contact-system references rather than a complete circuit-sizing recommendation.
| Contact Size | Typical Current Rating | Common Family Examples | General Role |
|---|---|---|---|
| Size 20 | 7.5 A | DTM and selected circular / high-density systems | Compact signal and lower-current circuits. |
| Size 16 | 13 A | DT, DTV and selected circular systems | General-purpose power and signal wiring. |
| Size 12 | 25 A | DTP, DTHD and selected circular systems | Higher-current circuits. |
| Size 8 | 60 A | DTHD and selected heavy-duty connector systems | Higher-power circuits. |
| Size 4 | 100 A | DTHD and selected heavy-duty circular systems | Heavy-duty power connections. |
TE Connectivity publishes these typical ratings for its Deutsch solid-contact range. Actual connector and circuit selection still depends on the exact contact, wire, temperature, duty cycle and installation.
For electrical-load selection, use the Deutsch Connector Current Rating Guide.
Deutsch Contact Size vs Wire Gauge
Contact size and wire gauge are not the same measurement.
A Size 16 contact does not automatically mean 16 AWG wire. Different Size 16 contact part numbers can support different conductor ranges.
| Example Contact | Contact Size | Supported Wire | What This Shows |
|---|---|---|---|
| 0462-201-16141 | Size 16 | 16-20 AWG | The contact-size number does not equal the wire gauge. |
| 0460-204-12141 | Size 12 | 12-14 AWG | The exact terminal determines the supported wire range. |
Always use the wire range listed for the exact contact part number. Other terminals of the same contact size can support different wire gauges.
For contact selection rather than sizing terminology, see the Deutsch Contacts, Terminals & Accessories Guide.
Deutsch Contact Size by Connector Family
Connector family can provide a useful starting point because some families are built around a particular contact size.
| Connector Family | Common Contact Size | Sizing Role | Browse |
|---|---|---|---|
| DTM | Size 20 | Compact rectangular connector system. | DTM Series |
| DT | Size 16 | General-purpose rectangular connector system. | DT Series |
| DTP | Size 12 | Higher-current rectangular connector system. | DTP Series |
| DTV | Size 16 | 18-position rectangular connector system. | DTV Series |
| DTHD | Size 12, 8 or 4 | Single-position higher-power connector system. | DTHD Series |
| HD10 | Varies by configuration | Circular connector family using different contact arrangements. | HD10 Series |
| HD30 | Varies by configuration | Heavy-duty circular connector family. | HD30 Series |
For HD10, HD30 and other mixed-contact families, do not infer contact size from the family name alone. Check the exact contact arrangement or product specification.
Contact Size vs Number of Positions
The number of positions tells you how many contact cavities or circuits the connector housing provides. It is separate from the size of each contact.
| Example | Positions | Contact Size | Meaning |
|---|---|---|---|
| DT 2-way | 2 | Commonly Size 16 | Two electrical cavities using the DT contact system. |
| DT 12-way | 12 | Commonly Size 16 | Twelve electrical cavities using the same broad DT contact size. |
| DTP 2-way | 2 | Size 12 | Two cavities using a larger contact system than DT. |
| DTV 18-way | 18 | Commonly Size 16 | A higher-position-count housing does not automatically mean larger contacts. |
This is particularly important when searching for “2-pin,” “4-pin” or “6-pin” Deutsch connectors. The pin count tells you the number of circuits, but you still need to choose the correct connector family and contact size.
Contact Size vs Connector Shell Size
Circular Deutsch connector families can introduce another sizing term: shell size.
A shell-size designation describes the connector housing configuration and should not be confused with the contact size installed inside it.
For example, an HD30 housing may have a shell-size designation in its part number while using a particular arrangement of Size 16, Size 12 or other compatible contacts. The shell number therefore does not tell you the wire gauge or current rating by itself.
For help interpreting housing codes and contact arrangements, use How to Read Deutsch Connector Part Numbers and the HD, HD10 & HD30 Connector Guide.
What About Physical Deutsch Connector Dimensions?
Contact size does not provide the overall length, width or height of a connector housing.
Physical dimensions depend on factors including:
- Connector family.
- Number of positions.
- Plug or receptacle configuration.
- Mounting style.
- Keying and modification suffixes.
- Rear-cap, flange or other housing features.
If installation space is critical, use the dimensions or product drawing for the exact SKU rather than trying to infer housing dimensions from contact size or cavity count.
This is also why this guide does not reproduce dimensions for every housing: those specifications belong with the exact connector product rather than a general sizing guide.
How to Choose the Right Deutsch Connector Size
Use this sequence rather than starting from a contact-size number alone.
- Determine the circuit load. Know what the circuit powers and the expected current.
- Choose appropriate wire. Size the conductor for the electrical and installation requirements.
- Choose the connector family. Decide whether DTM, DT, DTP, DTHD, HD or another family suits the circuit and harness layout.
- Confirm the contact size. Match the connector housing to the correct pin or socket contact system.
- Confirm the exact contact supports the wire. Contact size alone is not enough.
- Choose the number of positions. Match the housing to the number of circuits needed.
- Check the physical housing. Verify mounting, keying, dimensions and mating configuration.
If you want a side-by-side family overview, use the Deutsch Connector Selection Chart. If you want an application-led recommendation, use the Complete Deutsch Connector Selection Guide.
Mistakes We See
Treating contact size as wire gauge
A Size 16 contact is not automatically for 16 AWG wire. Check the wire range of the exact terminal.
Confusing cavity count with contact size
A 4-way connector has four positions. It does not mean Size 4 contacts.
Assuming a lower size number means a smaller contact
Within the common Deutsch contact system, Size 4 is physically larger and supports substantially more current than Size 20.
Choosing current rating from contact size alone
The contact rating is only one part of the electrical design. Wire size, temperature, duty cycle and installation conditions also matter.
Using family averages instead of the exact contact specification
Two contacts of the same nominal size can support different wire ranges or constructions.
Assuming contact size gives the outer connector dimensions
Use the exact housing drawing or product specification when packaging space matters.
Deutsch Connector Size FAQs
What do Deutsch contact sizes 20, 16 and 12 mean?
They identify different electrical contact sizes used inside compatible Deutsch connector housings. Size 20 is smaller than Size 16, while Size 12 is larger and typically supports higher-current circuits.
Is Deutsch Size 16 the same as 16 AWG wire?
No. Contact size and wire gauge are different measurements. A Size 16 contact can support a range of wire sizes depending on the exact terminal part number.
Which Deutsch connector uses Size 20 contacts?
DTM is a common rectangular Deutsch connector family using Size 20 contacts. Other connector systems can also use Size 20 contacts depending on their configuration.
Which Deutsch connector uses Size 16 contacts?
DT and DTV commonly use Size 16 contacts. Some circular connector configurations can also use Size 16 contacts.
Which Deutsch connector uses Size 12 contacts?
DTP commonly uses Size 12 contacts. Size 12 contacts are also used in DTHD and selected heavy-duty circular connector configurations.
Does a 4-pin Deutsch connector use Size 4 contacts?
Not necessarily. “4-pin” or “4-way” normally describes the number of positions in the housing. Contact size is a separate specification.
How do I know the physical dimensions of a Deutsch connector?
Check the specification or product drawing for the exact housing part number. Physical dimensions vary by connector family, position count, mounting style and configuration.
Final Recommendation
When you see a Deutsch connector “size,” first identify what is actually being measured. Contact size, wire gauge, number of positions and housing size are separate specifications.
Use the Deutsch Connector Selection Chart to compare families, then browse the relevant connector housings and contacts and terminals once you know the configuration you need.
