GN 509.4 Heavy Duty Ball Transfer Units Steel, without Flange


GN 509.4 Steel Heavy Duty Ball Transfer Units, without Flange

Product description


GN 509.4 heavy duty ball transfer units are typically used on conveyor tracks. They enable an effortless movement or rotation of even heavy loads in any direction.

They do not have a support flange, taking the load at the housing diameter d2 instead.



  • Turned
  • Zinc plated, blue passivated finish

Steel, plain finish


On request

Balls in plastic (polyamide)
Balls in stainless steel
Housings in stainless steel

Technical drawing

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GN 509.4 Steel Heavy Duty Ball Transfer Units, without Flange sketch

Part Options / Table

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Dimensions in: Inch (change to Metric)
d2 ±0.003d3
Sheet steel cover
h1 ±0.012h2 ±0.012h3Load rating C
80.310.710.710.470.080.2026.98 lbf (120 N)
120.500.870.870.690.220.3044.96 lbf (200 N)
150.620.94-0.790.20-112 lbf (500 N)
220.871.44-1.180.24-292 lbf (1300 N)
301.191.76-1.450.30-562 lbf (2500 N)
451.752.46-2.110.51-1349 lbf (6000 N)

Build & Price

3D Product Configurator

Arrangement and Size Selection

When determining the size of the ball transfer units, it is necessary to consider not only the weight but also the size and nature of the base area of the load.

The maximum distance between the ball transfer units „a2 (assuming a flat base area) is calculated by dividing the shortest edge length of the load by 2.5. This ensures that the load always rests on the ball transfer units, preventing it from tipping over into the spaces between them.

The required load capacity of the ball transfer units is calculated by dividing the weight of the load by 3. This results from the assumption that, due to tolerances of the load base area and the ball transfer units, only three ball transfer units are normally used.

Sketch GN 509

a1 = Shortest edge length of the load

a2 = Max. distance between ball transfer units

a2 = a1/2.5

F1 = Load weight

F2 = Load per ball transfer unit

F2 = F1/3

Speed and Friction

The permissible conveying speed is up to 2 m / sec. With larger ball transfer units at speeds exceeding 1 m / sec., depending on the load weight, an increase in temperature must be expected.

The friction values of the ball transfer units are about 0.005 µ at a speed of 1 m / sec. However, this value is subject to large variations depending on the operating conditions.

Compared to ball transfer units with steel sheet housing (GN 509), those with solid steel housing (GN 509.1) have a higher rigidity. In this case, the static values of steel balls can be applied.

Lubrication is recommended as protection against corrosion. The general rolling bearing regulations can be applied. In most applications, lubrication can be dispensed with.

Temperature Resistance

Ball transfer units from size 36 upwards are fitted with a felt seal as protection against ingress of dust and dirt. With this version, the max. operating temperature is 212 °F (100 °C) for balls made of steel.

Ball transfer units without felt seal can also be used at higher temperatures. However, this will lead to a reduced load rating (C). The following guide values apply:

257 °F (125 °C) ./. 10 %
302 °F (150 °C) ./. 20 %
338 °F (170 °C) ./. 30 %
392 °F (200 °C) ./. 50 %

The max. operating temperature for ball transfer units with plastic ball is 140 °F (60 °C).

Selected Part

Total US Dollars (net)
In Stock: 8
In Stock
Please note our quantity discounts (US Dollars).
≥ 250$5.09
Prop 65: Not compliant
Cancer and Reproductive Harm -
RoHS: Compliant
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).
Weight: 0.039 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
All Prices are in US Dollars. Taxes Not Included.

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