Manufacturer-documented die fit
The tool/head manufacturer explicitly says the die family or competitive die is accepted.
Home Crimping Dies & Crimper Die Compatibility Guide
Electrical crimp die systems
Crimping Dies & Crimper Die Compatibility Guide
Crimping dies are selected by a complete connection system, not by conductor size alone. This reference separates W- and U-style fit, adapter paths, die indexes and documented cross-brand relationships.
Crimping evidence chain
Tool → head/jaw → die family → conductor → connector → die/index → documented approval or classification. Physical fit alone is not enough.
Last technical review: August 26, 2026.
Crimping dies are not a universal size chart
A crimp die defines the compression profile, not merely the wire size. Two dies for the same AWG/kcmil conductor can differ because the connector material, barrel geometry, manufacturer, crimp type or tool system differs. Use conductor size as a filter, not as the final answer.
Common professional die families
| Die family | Typical tool context | Documented cross-brand examples | Do not infer |
|---|---|---|---|
| W-style | 6-ton utility crimpers/jaws | Milwaukee states its W dies fit crimping tools that accept W dies; Milwaukee 49-16-BGD3 accepts Milwaukee and competitive W dies. Greenlee CJD3 supports industry W-style dies. | That every W die is approved for every connector in every W-die tool. |
| U-style | Common 12-ton C-head systems | Greenlee EK1230/EK1240 families accept industry U-style dies. Burndy Y750/PAT750 uses U dies. Milwaukee 2778-20 requires U dies. | That all 12-ton heads accept U dies or that a cross-brand connector system is automatically listed. |
| Greenlee KC/KA/KD 12T | Greenlee 12-ton tools; adapter paths on selected larger tools | Greenlee 48802 die-holder documentation names Greenlee 12T, Burndy 12T, ILSCO ILD, T&B 15500 and Blackburn 15500 dies for that holder. | That the adapter validates every connector application across those brands. |
| Kearney | Utility crimpers with Kearney-specific jaw/head | Milwaukee and Greenlee publish specific Kearney jaw/head paths on selected tools. | That W/U dies and Kearney dies can be swapped without the documented jaw/adapter. |
Greenlee publishes unusually useful competitive-die evidence
Greenlee's 2025 Utility Catalog includes a 12-ton crimping die cross-reference with Greenlee, Burndy, T&B, ILSCO, Huskie, Panduit, Blackburn and Penn-Union numbers for selected color-coded lug/splice applications. Greenlee also states that the referenced 12-ton dies can be used with its 1230, 1240 and E12CCXL tools up to the tool's capacity.
This is excellent evidence for a specific tool/die relationship. It is not permission to create a generic equivalency table for every connector series.
Physical fit and approved connection are separate statuses
Documented with adapter
A named adapter or die holder is required and becomes part of the setup.
Physical fit only
The die seats in the head, but the reviewed manufacturer/connector documentation does not establish the termination system.
Unknown
The evidence is incomplete, conflicting or too broad to support a connector-specific claim.
Die index and color code: use both, trust neither alone
Burndy and other connector systems use color coding as a field identification aid, while the die index identifies the required groove/profile. A connector can also specify number and location of crimps. The safest workflow is to match the exact connector catalog family to the die/index table and then verify the tool/head that accepts that die.
For a source-backed example, see the Burndy Die Chart.
Why this page does not recommend a generic “crimp die set”
A mixed die set can be convenient only if its dies match the tool and the connector system you actually use. Buying a box labeled by AWG sizes before identifying the connector family reverses the correct selection order. For professional terminations, compatibility should be established first and shopping second.
Technical sources used for this guide
- Greenlee 2025 Utility Catalog — Crimping Die Reference — 12-ton competitive die cross-reference across Greenlee, Burndy, T&B, ILSCO, Huskie, Panduit, Blackburn and Penn-Union.
- Greenlee 48802 12-Ton Die Holder Kit — explicit Greenlee/Burndy/ILSCO/T&B/Blackburn die-adapter scope.
- Greenlee EK1240 12-Ton Crimper — Greenlee KC12/KA12/KD12 plus industry U-style die support.
- Greenlee EK628 6-Ton Crimper — optional industry W-style and T&B 6-ton jaw paths.
- Milwaukee 49-16-BGD3 6T BG Jaw — accepts Milwaukee and competitive W dies.
- Milwaukee 2778-20 12T Manual — U-die requirement and approved-combination warning.
- Burndy Dies & Gauges — current die-family categories including 6T W and 12T U dies.
Crimping Dies & Crimper Die Compatibility Guide FAQs
Are crimping dies interchangeable between brands?
Sometimes a manufacturer explicitly documents a shared die form or competitive die path. Examples include industry W-style die support and some 12-ton U-die systems. That establishes only the documented scope; it does not make every connector application cross-brand approved.
What is the difference between W and U dies?
They are different physical die families commonly associated with 6-ton and 12-ton tooling respectively. The exact tool head/jaw and connector instructions determine which family is appropriate.
Can a 12-ton U die be used in any 12-ton tool?
No universal assumption should be made. Some tools explicitly accept industry U-style dies, while others require adapters or different die systems. Check the exact head/tool documentation.
Why do crimp dies have colors and numbers?
Color codes help identify the intended connector/conductor range, while die indexes identify the groove/profile required by the connector system. The catalog number and index are more reliable than color alone.
What is a die adapter?
A die adapter allows one head or higher-force tool to hold a different die family when the manufacturer documents that path. The adapter itself becomes part of the approved tooling chain.