High reduction gear
Worm and wheel gear pairings provide large speed reduction ratios with only one gear pairing in a more compact space when compared with other types of gears.  We offer up to a maximum ratio of 100:1 with our products. Another advantage of the Worm and Wheel gear pairings is the low level noise they produce. Some disadvantages are the general low efficiency and the fact that they generate heat.

Advantage of KG’s Worm Gears – “Cold rolled Worm Gears”
1) The hardness of the helicoid surface has been achieved by work hardening when the cold rolling was performed, providing Worm gears with better mechanical properties than machined worms due to fact that the metallic fibrous structure has not been cut.

2) The surface hardness after cold rolling is increased by 1.2 to 1.3 times when compared with the hardness of the original material, and the hardness of the helicoid surface increases to around HB240 to 260.

3) Cold rolled worms are suitable for miniature gear applications since this can be rotated smoothly without damaging the worm wheels made out of POM or other soft materials.

4) Due to the implementation of this cold rolling method, the helicoid surface of KG-Worm (M0.5 to 2.0) comes out with a mirror like finish. Thus, KG-Precision Cold Rolled Worms provide a smooth operation and long term durability.

Worm Gear Pair Design – 3D CAD models and 2D CAD drawings
Now you can verify the dimensions of our standard Worm Gear pairings through our PDF catalog or our Gear Selector provided by Part Community. Free CAD data is available on the website. Click the logo below to access the Worm Gear Pairing Selector

Quotation of Standard Worm Gear Pair
Please request your Quotation for Worm Gear pairings through our “Request For Quotation” page.

Worm Gear Pair Modification
We can customize our standard Worm Gear pairings to suit your specific applications, please consult with us. We are offering gear modification services. Please check the details and examples of modifications at our “Gear Modification” page.

Precaution of Usage
Please refer to the following precautions before using our Worm Gear pairings.
(PDF : “Precaution of usage for Worm Gear Pair” from our Catalog)

COLD ROLLED -304 STAINLESS STEEL WORMS	COLD ROLLED STEEL WORMS	STEEL WORMS
Material (ISO) : SUS304 Module : 0.5 – 1.5 Finish of tooh : Cold rolling	Material (ISO) : S45C Module : 0.5 – 2.0 Finish of tooth : Cold rolling	Material (ISO) : S45C Module : 2.5 – 5.0 Finish of tooth : Cut
304 stainless steel has better corrosion resistance than 303 stainless steel.
PDF CATALOG	PDF CATALOG	PDF CATALOG

BRASS WORM WHEELS	ALUMINUM BRONZE WORM WHEELS	CAST IRON WORM WHEELS
Material : C3604 Module : 0.5 Number of teeth : 20 – 50	Material (JIS) : CAC702 Module : 0.8 – 4.0 Number of teeth : 20 – 50	Material (ISO) : FC200  Module : 1.0 – 5.0 Number of teeth : 20 – 100
PDF CATALOG	PDF CATALOG	PDF CATALOG

POM WORM WHEELS	POM WORM GEARS	POM WORM GEARS with BRASS BUSH BEARING
Material : POM (Blue) Module : 0.5 – 2.0 Number of teeth : 20 – 100	Material : POM (White) Module : 0.5 – 1.5 Number of teeth : 20 – 100	Material : Poly Acetal (White) Module : 1.0, 1.5 Number of teeth : 20, 30
Blue Polyacetal (Blue POM) gears have a lower water absorption rate and dimensional stability compared with nylon gears, due to this greater material integrity POM has lower chances of bacterial and mold contamination and is therefor  approved by regulating authorities in the food industries of the US and Europe.	Polyacetal (POM) gears have a lower water absorption rate and better dimensional stability when compared with nylon gears.	Polyacetal (POM) gears with a brass bush bearing, the bore diameter tolerance is H8. This gear was intended for applications that require smaller gap tolerances between the shaft and bore that only plastic gears can’t provide.
PDF CATALOG	PDF CATALOG	PDF CATALOG