The Donaldson DBF6776 alternative is Steinberg FF006, a direct OEM-grade equivalent for the Cummins ISX, ISX15, and X15 primary fuel filter position. DBF6776 is Donaldson's premium-tier filter for the Cummins X15 family, featuring synthetic media at 5 microns absolute. FF006 matches the spec sheet line by line: same micron rating, same dimensions, same threaded mount, same engine-mounted housing position. Where the two diverge is supply chain, not engineering. FF006 ships from our Hodgkins, Illinois warehouse with same-day shipping for orders before 2 PM CT and NET-30 terms for qualified fleet accounts.
What DBF6776 is and what it fits
The Donaldson DBF6776 is the Donaldson Blue Filter (DBF) series part for the Cummins ISX, ISX15, and X15 primary fuel filter position, EPA 2010 production through current Stage IV. DBF is Donaldson's premium tier: synthetic media, higher dust-holding capacity, longer service life under cold-weather and contaminated-fuel conditions than standard cellulose-paper-media filters. The DBF6776 specifically is engineered for the high-pressure common-rail injection systems on modern Cummins flagship engines.
The trucks running it: Kenworth T680 and T880, Peterbilt 579, Volvo VNL with Cummins option, Freightliner Cascadia with Cummins option, Mack Pinnacle with X15, and International LT and ProStar configurations. Anywhere a Cummins X15 is bolted into a Class 8 long-haul tractor, DBF6776 is one of the primary fuel filter options the operator can spec, alongside the Cummins-owned Fleetguard FF5825NN and the Steinberg FF006 aftermarket equivalent.
Spec parity: where DBF6776 and FF006 are identical
Cross-reference filters share the engineering spec by design. The whole point of an aftermarket equivalent is dimensional and performance parity. DBF6776 and FF006 share these specifications:
- Filter type: spin-on primary fuel filter, synthetic media
- Micron rating: 5 µm absolute (β₁₀₀₀ per ISO 19438)
- Outer diameter: 4.74 in (120 mm)
- Height: 5.6 in (143 mm)
- Thread: M16 x 1.5
- Service interval: 30,000–50,000 miles, depending on duty cycle and fuel quality
- Engine fit: Cummins ISX, ISX15, X15 primary fuel position (EPA 2010 through current Stage IV)
Where they differ
| Donaldson DBF6776 | Steinberg FF006 | |
|---|---|---|
| Brand position | Independent OEM-grade | Aftermarket OEM-grade |
| Pricing tier | Donaldson dealer (~$32–48/unit) | Wholesale fleet (~$18–25/unit) |
| Supply chain | Donaldson distributor network | Direct from Hodgkins, IL |
| Engine coverage | Multi-OEM, large catalog | Heavy-duty diesel focus |
| Shipping | Distributor lead time | Same-day before 2 PM CT |
| Payment terms | Standard | NET-30 for qualified fleet accounts |
Is Donaldson a good filter brand, and is Donaldson American?
Donaldson Company is American, headquartered in Bloomington, Minnesota, founded in 1915. It is one of the three independent top-tier filter manufacturers in the heavy-duty diesel space (alongside Baldwin and WIX), and it is independent: not owned by an engine OEM, which means it competes for spec across the Cummins, Detroit, Volvo, Mack, PACCAR, and International engine families on technical merit and price rather than corporate alignment.
That independence is the reason Donaldson shows up so often as an OE-supplied factory filter on truck builders that ship with multiple engine options. For a Cummins-only fleet, Fleetguard is the natural OEM match. For a mixed-engine fleet, Donaldson's multi-OEM catalog simplifies sourcing into one supplier. The DBF series specifically is Donaldson's premium synthetic-media line, engineered for the spec demands of modern high-pressure common-rail injection.
Cross-reference: every DBF6776 equivalent in one table
The full industry cross-reference for Donaldson DBF6776, mapped from Cummins QuickServe documentation and manufacturer cross-reference catalogs:
| Manufacturer | Part number |
|---|---|
| Steinberg (aftermarket) | FF006 |
| Fleetguard (OEM Cummins) | FF5825NN |
| Baldwin | BF46129 |
| WIX | WF10515 |
| Cummins (OEM) | 5365988 |
| Luber-Finer | LFF6776XL |
For any other Donaldson part number not in this table, run it through the Steinberg cross-reference search. Updated continuously as Donaldson revises its catalog and aftermarket brands cross-issue parts.
How DBF6776 differs from Cat 1R-0750
If you landed here from a search that included Caterpillar 1R-0750, this is not your filter. Cat 1R-0750 is a 2-micron primary fuel filter for the Caterpillar C-series engine families (C7, C9, C13, C15, C18) — a different engine maker, a different injection system, a different threaded mount. It does not fit the Cummins X15 fuel system, and DBF6776 does not fit a Caterpillar C-series. Both are top-tier synthetic-media filters; they just live on different engines. For Cat C-series cross-references, see the Cat-engine fuel filtration content separately. For Cummins X15, this post is the right one.
Why fleet operators switch from Donaldson to Steinberg
Donaldson DBF6776 at distributor pricing runs $32–48 per filter depending on volume and account terms. Steinberg FF006 lands in the $18–25 range at fleet pricing, same micron rating, same fitment. For a fleet running 50 trucks on 30,000-mile fuel filter intervals, that is roughly 100 filter changes per year — between $700 and $2,300 in line-item savings annually, before any volume discount.
The bigger arithmetic is on the supply-chain side. Friday morning, 80 miles into a 600-mile run, a truck pulls into a TA outside of Effingham, Illinois with a fuel restriction code. The shop has the wrong-size filter on the rack. The truck sits for a heavy-duty tow back to the home yard ($1,200), a yard tractor pulls the load forward ($400), and a relay driver covers the last 400 miles ($1.65 per mile, $660). The filter that prevented the situation was $20. The filter that did not was $48. The difference between them was sitting in the dealer's warehouse instead of the truck's housing. Spec discipline does not feel like savings until something else goes wrong, and then it stops being abstract very quickly.
What ships and how
Steinberg FF006 ships from our Hodgkins, Illinois warehouse, same-day for orders placed before 2 PM CT, with NET-30 payment terms for qualified fleet accounts. Mixed-engine fleets sourcing Donaldson, Fleetguard, Baldwin, and Cummins OEM parts through one supplier: email sales@steinbergus.com with your fleet size and engine breakdown for a tailored cross-reference list and pricing.
For the broader Cummins X15 catalog (water separators, lube filters, air intake), see the Cummins ISX 15 / X15 Filters collection. For the FAQ-format quick lookups, see cross-reference for FF5825NN (the OEM-Cummins equivalent of DBF6776).
Browse the Cummins ISX 15 / X15 Filters collection →
Sources & further reading
- Donaldson Company catalog — DBF series specifications, cross-reference matrix, and engine fitment data.
- Cummins QuickServe Online — OEM service documentation for ISX, ISX15, and X15 fuel system part numbering.
- Filter Manufacturers Council cross-reference standards (β-ratio testing per ISO 19438).
Photo: Pexels (35996049).