Flat Lubrication Brushes for Chains, Rails and Gear Faces
A flat lubrication brush lays a film of oil or grease across a known width. The bristle face meets the target as a line rather than a point, so a single pass covers roller and conveyor chains, slideways, broad gear faces and belt edges. The body holds the bristles at a fixed angle, which keeps contact even when the brush is mounted in a lubricator body or a valve-brush assembly. Operators choose the width to match the surface, then set the brush so the tips touch lightly and drag is low. For a full view of the range, see the lubrication brush category.
Flat or Round: Choosing the Shape
The flat brush is the right choice when the target is a broad, open surface: chain link plates, rail heads, gear teeth across the face, and belt edges. A round brush suits narrow grooves, recessed points and curved targets, where a small contact patch reaches into a confined space. If your surface is wide and flat, stay with the flat side of the range. The brush overview shows how the two shapes sit in the same family, and the brush product page covers the shared body and thread options.
Bristle Materials and Working Temperatures
Bristle choice follows the surface and the heat at the contact point. Nylon and horsehair give a gentle film transfer on polished rails and fine chain. Polyamide blends and synthetic fiber sit between the soft and stiff options. Hog bristle holds oil well and resists flattening. Bronze is stiffer and scrubs without marring most steel surfaces. Stainless steel handles heat to about 350°C and resists wear where the brush runs continuously. Nylon is suitable to about 100°C.
| Bristle material | Typical use | Working temperature |
|---|---|---|
| Nylon | Gentle film transfer | To about 100°C |
| Polyamide blends | General oiling | Moderate heat |
| Horsehair | Fine chain and rail | Moderate heat |
| Hog bristle | Oil retention | Moderate heat |
| Synthetic fiber | General purpose | Moderate heat |
| Bronze | Stiffer scrubbing | Elevated heat |
| Stainless steel | Hot surfaces and wear | To about 350°C |
Size Range and Mounting Threads
Widths run from 5 mm to 171 mm, and bristle lengths are 7 mm, 30 mm, 32 mm and 40 mm. Bodies are aluminum or ABS. The mounting connection is 1/8 inch NPT female or 1/4 inch NPT female. The 1/8 inch NPT female thread is the common connection for standard lubricator bodies; the 1/4 inch NPT female thread suits heavier bodies and larger brush heads. A useful rule is to pick the widest flat brush that lightly contacts the surface without heavy drag.
| Feature | Options |
|---|---|
| Width | 5, 25, 40, 57, 70, 100, 114, 171 mm |
| Bristle length | 7, 30, 32, 40 mm |
| Body | Aluminum or ABS |
| Mounting thread | 1/8 inch NPT female, 1/4 inch NPT female |
What Is Supplied
Each unit arrives as a brush head with its bristles set in the body and the mounting thread cut into the base. No separate adapter is needed for the two thread sizes listed. The brush fits directly into a lubricator body or a valve-brush assembly. If you need the brush with a chain oiling body already assembled, the chain oil brush assembly pairs the head with a matched body. Related holders, brackets and fittings sit in the lubrication accessories range.
Mounting, Cleaning and Replacement
Thread the brush into the body by hand, then bring the bristle tips to the surface until they touch lightly. Heavy drag bends the bristles and spreads the film unevenly. Clean the brush between lubricant types so the old oil does not carry into the new charge; a wipe with a compatible solvent and a dry-out period is enough. Replace the brush when the bristles collapse, flare or stop returning to shape. Keep a spare head on the shelf so a worn brush does not interrupt a lubrication round. For a quotation on a specific width and bristle, contact us for a quote.
Frequently Asked Questions
Flat or round for a roller chain?
Use flat for the link plates and pin rows across the chain width. Round suits only recessed pins or tight curved runs.
Which bristle for hot surfaces?
Stainless steel is the choice for heat to about 350°C. Bronze covers elevated heat where a softer touch is wanted.
Which bristle for gentle oiling?
Nylon and horsehair transfer a light film on polished rails and fine chain. Hog bristle holds oil well for steady feed.
What widths are available?
Widths are 5, 25, 40, 57, 70, 100, 114 and 171 mm. Pick the widest that lightly contacts the surface.
What mounting thread do the brushes use?
The connection is 1/8 inch NPT female or 1/4 inch NPT female. The larger thread suits heavier bodies.
Are aluminum and ABS bodies both offered?
Yes, both body materials are available across the range. Choose by the weight and the mounting you need.
Can brushes be cleaned between lubricants?
Yes, clean the bristles when you change lubricant type. Wipe with a compatible solvent and let the brush dry.
How often should a brush be replaced?
Replace it when bristles collapse, flare or stop returning to shape. Keep a spare head on the shelf.
Where do I confirm a size list?
Send your width, bristle length and thread to our team through the quotation request page and we will confirm the match.
Who supplies these brushes?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
