4575A-M25-330

4575A-M25-330 oil hose for the An-2

4575A-M25-330 is a engine oil hose assembly listed for the engine oil system of the Antonov An-2. The assembly has a catalogue length of 330 mm and is identified by drawing 181312-3M-25-029. It forms a flexible oil-transfer connection between engine-system components where a rigid pipe would not adequately accommodate installation tolerances, normal vibration and limited relative movement between connected parts.

The complete designation must be used when selecting the hose. An-2 hose assemblies may have similar external construction while differing in length, fitting size, fitting orientation, working medium or installation position. A visually similar item must not be accepted as a replacement without comparing the full part number, drawing, end connections and the applicable aircraft records.

Role in the engine oil system

During operation, the flexible body carries engine oil between the connected units while the end fittings maintain a sealed mechanical interface with the pipeline. Flexibility helps reduce loads transferred from vibration or small movements into adjacent rigid tubes and equipment connections. The exact installation point of drawing 181312-3M-25-029 should be confirmed from the illustrated parts catalogue, maintenance manual or system diagram for the individual aircraft.

This is not a general-purpose industrial hose. Its suitability depends on the approved working pressure, temperature range, internal diameter, material compatibility, bend radius and fitting configuration. These execution-specific parameters were not reliably confirmed in open sources. They should be taken from the product passport, drawing and current An-2 maintenance documentation instead of being inferred from another hose in the same category.

Construction and identification of 4575A-M25-330

The catalogue describes a reinforced flexible aviation hose with installed metal end fittings. Reinforcement supports the elastomer body against mechanical and pressure loads, while the fittings provide a repeatable connection to the aircraft pipeline. The catalogue data also identify an M25×1.5 threaded connection; the orientation and complete geometry of both ends still have to be checked against the removed assembly. Markings on the hose, ferrules or identification tag should remain legible for incoming inspection.

The available catalogue entry refers to the approved design documentation rather than naming a separate OST specification. The standard or drawing reference does not by itself establish the exact pressure rating of this execution. Length is likewise only one identification characteristic: 330 mm must be assessed together with connection dimensions, end orientation and the drawing number. The mass and precise overall dimensions other than catalogue length were not reliably found.

Installation and condition checks

Before installation, protective caps, internal cleanliness, fitting condition and the flexible surface should be checked. The hose must follow its intended route without stretching, twisting or forcing the fittings into alignment. It should have smooth bends and adequate clearance from hot zones, moving parts, sharp edges and points where vibration could cause abrasion. Tightening and support arrangements must follow the aircraft maintenance instructions.

Inspection should cover cracks, hardening, swelling, cuts, exposed reinforcement, damaged ferrules, corrosion and loose fittings. Evidence such as oil seepage, wet fittings or contamination around the connection requires evaluation under the approved maintenance procedure. The manufacturing date, storage conditions and permitted service life should be checked from the available documentation. Apparent good condition alone does not confirm airworthiness or interchangeability.

Ordering 4575A-M25-330 and related An-2 hoses

This position is included in the Aviamisto Hoses for An-2 category. Related catalogue positions are 4575A-M25-530; 4575A-M25-600; -12-2-330 ОСТ1 13816-81; -6-1-370 ОСТ1 13814-81. They are linked to simplify navigation within the An-2 hose range; the links do not indicate that the products are interchangeable.

For a supply enquiry, specify 4575A-M25-330, drawing 181312-3M-25-029, the required quantity and documentation requirements. Whenever possible, provide photographs of the removed hose, its marking and both fittings. Applicability to a particular An-2 aircraft and approval for installation must be verified against the aircraft configuration and current technical documentation before use.

Product Type: Engine oil hose assembly

Designation: 4575A-M25-330

Alternative Designations: 4575A-M25-330; 4575A M25 330; 4575А-М25-330

Aircraft: Antonov An-2

Application: Engine oil system

Function: Forms a flexible oil-transfer connection between engine-system components

Drawing: 181312-3M-25-029 / 181312-3М-25-029

Standard: Design documentation

Nominal Length: 330 mm

Construction: Reinforced flexible aviation hose with metal end fittings

Working Medium: Engine oil according to the applicable An-2 system documentation

Installation Area: An-2 engine oil system; exact position requires aircraft documentation

Thread Connection: M25×1.5

Exact Working Pressure: Reliable execution-specific data were not found; confirm from the passport or drawing

End Fittings and Orientation: Confirm against the removed unit and approved drawing

Internal Diameter: Reliable data for this exact configuration were not found

Temperature Range: Reliable data for this exact configuration were not found

Mass: Reliable data for this exact configuration were not found

Related Products: 4575A-M25-530; 4575A-M25-600; -12-2-330 ОСТ1 13816-81; -6-1-370 ОСТ1 13814-81

Interchangeability: Not confirmed; matching length or appearance alone is insufficient

Condition: New

Warranty: 6 Months

Stock Status: Pre-Order

Technical Documentation: Drawing, product passport and available conformity documents upon request

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In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.

Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.

Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.