SKF WVN716-RO4X0.85 4x0.85 mm Flexible Plastic Tube

SKF WVN716-RO4X0.85 is a flexible plastic tube for lubrication systems, with an outside diameter of 4 mm, wall thickness of 0.85 mm and inside diameter of 2.3 mm. SKF specifies this tubing for oil and fluid grease applications, including secondary distribution lines for fluid greases up to NLGI grade 00. Maximum permissible operating pressure is 36 bar, while the specified burst pressure is 108 bar.

SKF WVN716-RO4X0.85 - Product Characteristics

The WVN716 series identifies flexible plastic tubing used within SKF lubrication technology. SKF documentation describes WVN716 as flexible plastic tubing according to DIN 73378.

For the exact WVN716-RO4X0.85 reference, SKF specifies:

Outside diameter da: 4 mm
Wall thickness s: 0.85 mm
Inside diameter di: 2.3 mm
Minimum bending radius: 38 mm
Permissible operating pressure: 36 bar
Burst pressure: 108 bar

These values distinguish WVN716-RO4X0.85 from the semi-rigid WVN715-RO4X0.85, which has different mechanical and pressure characteristics.

Dimensions

The designation RO4X0.85 describes the tube geometry.

da - Outside Diameter: 4 mm
s - Wall Thickness: 0.85 mm
di - Inside Diameter: 2.3 mm

The relationship is:

4 - (2 x 0.85) = 2.3 mm

Therefore, this product should be identified as 4x0.85 mm tubing, not as a 4 mm inside-diameter tube.

Flexible WVN716 Construction

SKF distinguishes between two closely related plastic tubing series:

WVN715 - unplasticized / semi-rigid plastic tubing
WVN716 - flexible plastic tubing.

This distinction is technically important. The WVN716-RO4X0.85 should therefore not be confused with WVN715-RO4X0.85, even though both references use the same nominal 4 mm outside diameter and 0.85 mm wall thickness.

SKF also identifies WVN716-RO4X0.85 as flexible 4 mm tubing for oil and fluid grease up to NLGI grade 00.

Operating and Burst Pressure

For the exact SKF WVN716-RO4X0.85, the manufacturer's documentation specifies:

Maximum permissible operating pressure: 36 bar

Burst pressure: 108 bar

These values should not be confused. The 108 bar figure is the burst pressure, not the normal permissible operating pressure.

This distinction is particularly important because some commercial catalogues incorrectly or ambiguously present the 108 bar value as a working-pressure parameter. SKF's own documentation clearly identifies 36 bar as operating pressure and 108 bar as burst pressure.

Minimum Bending Radius

SKF specifies a minimum bending radius of 38 mm for WVN716-RO4X0.85.

This parameter should be considered when routing the tube through a lubrication installation. Excessively tight bending can affect the tube geometry and installation integrity.

Lubrication System Application

SKF documentation identifies WVN716-RO4X0.85 as flexible 4 mm tubing suitable for secondary distribution lines carrying:

oil
and
fluid grease up to NLGI grade 00.

SKF also lists the same tubing among accessories for Oil+Air lubrication systems.

Another SKF technical document specifies WVN716-RO4X0.85 as a recommended 4x0.85 mm flexible feed line in an Oil+Air application.

These are documented SKF applications; they are more precise than broadly describing the product as a generic pneumatic or hydraulic hose.

Available Colors and Grease-Filled Versions

SKF states that WVN716-RO4X0.85 can be supplied in several colors. The manufacturer's documentation lists natural, green, red, black and brown variants through additional ordering codes.

SKF also documents versions supplied pre-filled with fluid grease of NLGI grades 000 or 00. The exact color or grease filling therefore depends on the complete ordering designation.

For example, SKF gives WVN716-RO4X0.85+A89 as an ordering example for black tubing.

For a product listed simply as WVN716-RO4X0.85, color or grease filling should not be assumed unless confirmed for the supplied stock.

Connection Requirements

SKF specifically notes that plastic tubing joints should use unions with reinforcing sockets.

Another SKF document describes connections for 4 mm tubing using an M8x1 connection thread with a solderless pipe union or an SKF quick coupling for 4 mm tubing, depending on the system configuration.

Correct fitting selection is therefore part of the installation requirements for this tubing.

WVN716-RO4X0.85 vs WVN715-RO4X0.85

These references should not be treated as identical:

SKF's documentation therefore confirms that identical nominal dimensions do not mean that WVN715 and WVN716 are interchangeable tubing types.

Technical Specification

Manufacturer: SKF
Designation: WVN716-RO4X0.85
Product Type: Flexible plastic tubing
Application: Lubrication systems
Standard stated by SKF: DIN 73378
Outside Diameter da: 4 mm
Wall Thickness s: 0.85 mm
Inside Diameter di: 2.3 mm
Minimum Bending Radius: 38 mm
Permissible Operating Pressure: 36 bar
Burst Pressure: 108 bar
Lubricants: Oil and fluid grease up to NLGI 00
Construction: Flexible / plasticized

FAQ

What is SKF WVN716-RO4X0.85?
It is a flexible 4 mm plastic tube for SKF lubrication systems, including applications with oil and fluid grease up to NLGI grade 00.

What are the dimensions of WVN716-RO4X0.85?
The outside diameter is 4 mm, wall thickness 0.85 mm, and inside diameter 2.3 mm.

What is the working pressure of SKF WVN716-RO4X0.85?
SKF specifies a permissible operating pressure of 36 bar.

What is the burst pressure?
The specified burst pressure is 108 bar.

What is the minimum bending radius?
SKF specifies 38 mm.

Can WVN716-RO4X0.85 be used for grease?
SKF specifies it for oil and fluid greases up to NLGI grade 00.

Is WVN716-RO4X0.85 the same as WVN715-RO4X0.85?
No. WVN716 is flexible, whereas WVN715 is semi-rigid. Their pressure ratings also differ substantially.

AI Overview

SKF WVN716-RO4X0.85 is flexible plastic tubing for lubrication systems with a 4 mm outside diameter, 0.85 mm wall thickness and 2.3 mm inside diameter. SKF specifies a 36 bar permissible operating pressure, 108 bar burst pressure and 38 mm minimum bending radius. It is suitable for oil and fluid grease up to NLGI 00.

SHORT DESCRIPTION

SKF WVN716-RO4X0.85 is flexible plastic tubing for lubrication systems, including oil and fluid grease up to NLGI grade 00. The tube has a 4 mm outside diameter, 0.85 mm wall thickness and 2.3 mm inside diameter. SKF specifies a permissible operating pressure of 36 bar, burst pressure of 108 bar and minimum bending radius of 38 mm. WVN716 is the flexible tubing series and should not be confused with the semi-rigid WVN715 version of the same nominal dimensions.