303081 Piston Assembly, 4.5 Inch, Bonded
The 303081 Piston Assembly is a 4.5-inch bonded piston for the fluid end of a reciprocating pump. The piston transmits force from the power end to the pumped fluid inside the cylinder liner, carrying its sealing element and reciprocating within the liner bore on every stroke. This is an aftermarket replacement part supplied under part number 303081 and ships at about 7 lb.
What it is
A pump piston transmits force from the power end to the pumped fluid inside the cylinder liner. It carries the sealing element and reciprocates within the liner bore on every stroke.
Specifications
| Property | Value |
|---|---|
| Weight | 7.00 lb (≈ 3.18 kg, converted) |
Manufacturer technical notes
4.5" Bonded Piston Assembly (SKU:303081), API 7K-certified 42CrMo alloy steel core (tensile strength ≥1100MPa) with ASTM D2000 BG-grade polyurethane bonding (Shore A85±3 hardness), induction hardened (HRC58-62) + hard chrome plated (≥50μm), salt spray tested >1500hrs corrosion-free. Compatible with API 7K mud pumps, dynamic leakage ≤0.02mL/min.
Verbatim from the Dongli product page on dlhddrilling.com.
Replacement / interchange
Aftermarket replacement cross-referencing 303081.
FAQ
- What does the 303081 piston assembly do?
- It transmits force from the power end to the fluid inside the cylinder liner and carries the sealing element as it reciprocates in the liner bore. It is sized at 4.5 inches.
- What does "bonded" mean for this piston?
- "Bonded" refers to the bonded construction of this 4.5-inch piston assembly, as stated in the product name.
- Is 303081 an OEM part?
- It is an aftermarket replacement piston assembly supplied under part number 303081 to match the original by form and fit.
Related parts
All brand names, model numbers and part numbers are used for identification and cross-reference only and do not imply original-equipment manufacture. This is an aftermarket replacement part.
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