What 125741 Actually Is
125741 is an air hose T-bolt clamp. Stainless steel band, stainless T-bolt and trunnion nut. It goes on the intake air hose connection on Cummins NT855 and N14 diesel engines. Unlike a worm-gear clamp, a T-bolt pulls the band evenly around the full circumference, which is what a pressurized charge hose needs to stay sealed under boost.
The clamp lives in the engine bay and eats heat cycles all day. Stainless resists the corrosion that kills plated steel bands, but the failure point is usually mechanical, not chemical. The band stretches slightly, the hose takes a compression set, and clamping load drops off. You end up with a slow leak that shows as low boost and higher pyro.
These engines run in Class-8 trucks including Kenworth W900 and T800 and Volvo VNL. That is the application range given for this part. Engine serial number is what confirms it, not the truck badge on the hood.
Why These Numbers Cross
The allowed cross-references are DS-125741 from Diesel Parts Direct and M-125741 from Interstate-McBee. Look at the pattern. Both suppliers took the base 125741 identifier and hung their own prefix on the front of it. DS- and M- are catalog prefixes, not different clamps.
That prefix habit is common in the heavy-duty aftermarket. A supplier lists a part in their own system, keeps the recognizable base number so counter staff can find it, and adds two characters so their inventory does not collide with anyone else's. The band diameter, band width, and T-bolt hardware behind those three listings are the same clamp.
So if a driver hands you a box marked M-125741 or a purchase order calls out DS-125741, you are looking at 125741. Those numbers are listed for identification only. PartStop is not affiliated with, endorsed by, or authorized by any of those companies or any OEM.
Check Before You Order
Pull the old clamp and read it. Stainless bands are often laser-marked or stamped on the band near the trunnion. If the number is legible, that beats any catalog lookup. If it is corroded off, measure the hose outside diameter with the clamp removed and measure the band width, then match against the engine serial number.
Replace the clamp any time you pull the intake hose. A used T-bolt that has been torqued and heat-cycled will not hold the same load twice. Also inspect the hose itself. If the rubber has a permanent groove where the old clamp sat, or feels soft and oily, a new clamp will not fix that leak. Cross-reference is a starting point only. Confirm fit by VIN or by the number on the part you removed.
125741 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 125741. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Diesel Parts Direct | DS-125741 |
| Interstate-McBee | M-125741 |
Frequently asked questions
Is M-125741 the same clamp as 125741?
Yes, they identify the same air hose T-bolt clamp. Interstate-McBee lists it with an M- prefix on the base number, which is a catalog convention rather than a different part. Confirm against your engine serial number or the marking on the clamp you pulled off before you order.
Why does my intake hose keep leaking after a new clamp?
The clamp is usually not the problem on a repeat leak. Check the hose for a permanent compression groove where the old band sat, and check for soft or oil-soaked rubber. Also check that the tube bead under the hose is not dented or corroded. A T-bolt clamp needs a round, firm surface to seal against.
Can I substitute a worm-gear clamp on an NT855 or N14 intake hose?
Not a good idea on a pressurized charge connection. A worm-gear band pulls hardest at the screw housing and leaves uneven load around the rest of the hose, which is where boost leaks start. The T-bolt design is specified here because it applies even clamping pressure across the full circumference.
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Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
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