A wastewater treatment plant with cylindrical tanks, metal pipes, and railings hosts a person in protective gear managing the industrial equipment.

Polychem® Stub Shafts

Brentwood’s Polychem sprockets are molded from a specially selected, high-strength Nylon material that outwears and outlasts UHMW-PE and polyurethane sprocket alternatives. All sprockets are equipped with standard integral teeth to maintain tooth alignment and are designed for use with Polychem collector chain.

Two dark steel chamfer-style weights with cylindrical tops and wider, tapering bases resemble stub shafts. The weights are uniform in color with a smooth, matte surface finish.
Features
Split design allows use of both sides of sprocket teeth
Not susceptible to rust
High-strength Cast Nylon 6 material
Navigate Within Polychem® Systems

Specifications

English Metric
Stub Shaft #Max. Sprocket Centerline Distance From Wall
inches		Standard Journal Length
inches		Base Diameter
inches		Max. Overall Length
inches		Min. Overall Length
inches		Base & Journal MaterialBearing MaterialRetainer Plate Material
5
29
5.38
15
30.5
10.69
Cast Nylon 6
UHMW-PE
Polycarbonate
6
20
5.38
11.56
24
10.69
Cast Nylon 6
UHMW-PE
Polycarbonate
Stub Shaft #Max. Sprocket Centerline Distance From Wall
mm		Standard Journal Length
mm		Base Diameter
mm		Max. Overall Length
mm		Min. Overall Length
mm		Base & Journal MaterialBearing MaterialRetainer Plate Material
5
736.6
136.65
381
774.7
271.53
Cast Nylon 6
UHMW-PE
Polycarbonate
6
508
136.65
293.62
609.6
271.53
Cast Nylon 6
UHMW-PE
Polycarbonate
A close-up view of industrial machinery with cogwheels, head shafts, and a chain, all shown in a blue-tinted color scheme.
System Animation

Learn how all the components in a standard Polychem system are assembled and installed.

Watch Video

Complementary Components

Retainer Plate
Bearings
Hardware
Retainer Plate

Sprockets can be secured to the stub shaft with a single bolt using the polycarbonate retainer plate.

Bearings

The water-lubricated UHMW-PE tubular bearings spin on the spindle and are keyed to the outer end tubes to support the shaft. Oil-filled Nylon 6 bearings are available for specific cases where high temperatures and chemicals corrode UHMW-PE.

Hardware

The hardware kit utilizes 316 SS leveling bolts to allow for proper alignment and adjustability in the field.

an image showing the retainer plate of a stub shaft an image showing two stub shaft bearings side by side A small plastic bag containing three metal bolts, two washers, and two nuts on a white background.

Articles & Literature

Rectangular clarifier systems
Rectangular vs. Circular Clarifiers: What is the Best Option?
Clarifiers are crucial in water and wastewater treatment processes as they help separate solid particles from liquids. However, selecting the right type of clarifier can be a daunting task. This article will compare the two most commonly used clarifier shapes, rectangular and circular, to help you decide which is best for your application.
Read Article
Literature
Polychem Chain & Flight Brochure Polychem Field Services

Water & Wastewater Treatment Products

an image showing three head shafts
Head Shafts
an image showing a close up of a sprocket for PolyChem Systems
Sprockets
Close-up view of multiple metal channel sections, displayed in varying angles. The channels, likely made of steel or aluminum, exhibit smooth, reflective surfaces and sharp, clean edges
Flights
an image of a close up featuring an overview of a collector chain
Collector Chain
A blue motorized mechanical device, known as a drive unit assembly, is mounted on a concrete surface with bolts. It connects to a chain and sprocket system adjacent to a metal frame.
Drive Unit Assembly
A close-up of water flowing over a weir at a wastewater treatment plant. The image shows sediment and debris, part of the scum removal process, on the water surface as it moves over a red and brown barrier before falling into a lower section. The structure is surrounded by concrete.
Scum Removal
A shield emblem with the letters "SG" is at the center of the image. "SMARTGUARD" stands out in large, bold letters, while "COLLECTOR MONITORING SYSTEM" appears in smaller text beneath it. The background features a wavy, abstract pattern in dark and light shades.
SmartGuard®
A worker wearing a high-visibility vest and a hard hat is standing in an industrial setting, using a tape measure to gauge a section of a large pipe.
Field Services
Abstract image featuring a minimalist design of white and light gray geometric shapes. The background has a subtle gradient, creating a clean and modern aesthetic.
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