Stainless Steel Worm Gear for CNC Machinery – DIN 5-7, M1-M4

Stainless steel worm gears for CNC machinery are precision worm gear and worm wheel sets manufactured to ANSI or DIN standard dimensions — module M1 to M3 (up to M4), tooth count Z15 to Z70, finished bore, precision grade DIN 5 to DIN 7, pressure angle 20°, surface hardness 55–60 HRC. Available in stainless steel, 1045 carbon steel, SCM 415 alloy steel, brass, bronze, aluminium alloy, copper, POM, nylon, PA66, MC, PEER, MSM, and Delrin. Korea Ever-Power's stainless steel worm gears for CNC machinery are the specification choice for corrosion-resistant, precision, high-load worm drive applications in CNC machines, electronic and electrical equipment, food processing machinery, chemical machinery, and all environments where corrosion resistance is as important as gear precision.

Produced to ISO 9001:2008 certified quality management. Full machining process from material preparation through normalising, rough turning, heat treatment, semi-finish turning, thread/spiral surface machining, inner hole and keyway finishing, grinding, and final product inspection — all in-house at Korea Ever-Power's manufacturing facility.

Product Parameters

Materials Available

ANSI/DIN Standard Compliance

Produced strictly to ANSI or DIN standard dimensions — the worm gear is a drop-in replacement for standard catalogue worm gears in the specified module and tooth count. No special adaptation required for worm gearbox units designed to these standards. This interchangeability reduces machine downtime for maintenance parts replacement.

DIN 5–7 Precision for CNC Accuracy

DIN 5 is the highest precision grade available — pitch error, profile error, and lead error all controlled to DIN 5 tolerances. For CNC machine tool worm drives where the table positioning accuracy depends directly on the worm gear accuracy, DIN 5 is the correct specification. Korea Ever-Power supplies DIN 5, 6, and 7 as standard options — select based on the required positioning accuracy of the application.

55–60 HRC Surface Hardness

The 55–60 HRC thread surface hardness, achieved by carburising and quenching (SCM415 alloy steel) or high-frequency induction hardening (1045 carbon steel), provides the wear resistance required for long service life in continuously-operating CNC machine worm drives. The ground thread surface at this hardness level resists pitting and scuffing fatigue at the highest contact stresses encountered in CNC machine tool worm gear drives.

Finished Bore with Keyway

Finished bore to AH7 tolerance with optional keyway enables direct installation on the motor or intermediate shaft without additional boring or keyway machining at the customer's facility. This shortens machine maintenance time and eliminates the dimensional variability that results from field boring operations. Pilot bore is available when the customer requires machining to their own shaft specification.

CNC Machinery

DIN 5–7 stainless steel or alloy steel worm gears in CNC machining centre rotary table drives, CNC lathe turret indexing drives, and CNC grinding machine wheel dressing drives. The combination of corrosion resistance (coolant exposure), precision (DIN 5–7), and high surface hardness (55–60 HRC) makes Korea Ever-Power stainless worm gears the specified choice for CNC machine tool worm drives operating in coolant-flood environments.

Electronic and Electrical Appliances

M1–M2 stainless steel or POM worm gears in automated electronic assembly equipment, PCB handling drives, and precision electrical appliance adjustment mechanisms. Non-magnetic stainless steel worm gears are required in applications near sensitive magnetic sensors or where magnetic contamination of electronic assemblies is a concern.

Food Machinery

SS316 / SS316L stainless steel worm gears in food processing conveyor drives, portioning machine drives, and packaging machine right-angle drives. SS316L is the correct specification for food contact applications — its low carbon content prevents sensitisation (chromium carbide precipitation at grain boundaries) that would reduce corrosion resistance in the heat of welding or repeated steam sterilisation cycles.

Chemical Machinery

SS316 stainless steel worm gears in chemical reactor agitator drives, pump drive units, and valve actuator gearboxes in chemical plant service. The molybdenum content of SS316 provides resistance to chloride-induced pitting and crevice corrosion — the failure mode that eliminates SS304 from chloride-containing chemical environments. Korea Ever-Power supplies material certificates confirming Mo content for chemical industry procurement documentation.

Environmental Protection Machinery

Stainless steel worm gears in wastewater treatment plant aerator drives, sludge scraper drives, and environmental monitoring equipment positioning drives. These are continuous-duty, outdoor or humid-environment applications where the gear drive must operate without maintenance for extended periods. Stainless steel worm gears eliminate the corrosion-related maintenance that plagues carbon steel worm gears in wastewater plant environments.

Mining, Rubber, and Cement Machinery

High-surface-hardness alloy steel (SCM415, carburised to HRC 58–62) worm gears in heavy-duty mining conveyor drives, rubber mixing mill auxiliary drives, and cement plant kiln auxiliary drives. The extreme duty cycle and shock loading of these applications require the highest available combination of surface hardness, core toughness, and thread accuracy — all achievable with Korea Ever-Power's SCM415 carburised and ground worm gear sets.

What is the difference between 1045 carbon steel and SCM415 alloy steel worm gears?

1045 carbon steel worm gears are produced by high-frequency induction hardening of the thread surface, achieving HRC 55–58 surface hardness with a shallow hardened layer (0.5–1.5 mm). This is adequate for moderate duty CNC machinery applications. SCM415 alloy steel (equivalent to 20CrMo) is case-carburised to achieve a 1.0–2.0 mm deep hardened layer at HRC 58–62, with a tough core at HRC 30–40 — providing superior fatigue life under cyclic contact stress. SCM415 is specified for high-duty-cycle CNC applications and wherever the thread must withstand heavy loads over long service lives. For food machinery, stainless steel (SS316L) is specified regardless of load.

What worm gear precision grade is needed for CNC machine tool applications?

DIN 5 is the correct specification for the most demanding CNC positioning applications — CNC rotary tables with positioning repeatability requirements of ±0.01 mm or better. DIN 6 is adequate for standard CNC machining centre table drives with ±0.02–0.05 mm positioning repeatability. DIN 7 is the standard for general industrial CNC drives without tight positioning requirements. Korea Ever-Power supplies all three grades; specify the positioning accuracy requirement and Korea Ever-Power will recommend the correct precision grade. Contact our team to begin.

"We manufacture CNC machining centres and use Korea Ever-Power SCM415 worm gears for CNC machinery (DIN 6, M2.0, carburised HRC 60) in our rotary table indexing drives. Gear measurement at incoming: pitch error 4.2 µm, profile error 3.8 µm — both within DIN 6 tolerance. Table positioning repeatability: ±0.018 mm bidirectional — within our ±0.02 mm specification. 26 months in production; no tooth wear detectable at last inspection."

Kim Sang-cheol  |  CNC Machine Tool Design Engineer, Incheon Precision Manufacturing Co.  ·  Q1 2026

"We build food processing conveyor line drives and specified SS316L worm gears M2.5 from Korea Ever-Power. Daily hot washdown at 80°C with caustic detergent — no corrosion on thread surface or bore after 20 months. Material certificate with Mo content confirmed: 2.12% Mo — within SS316L specification. FDA food-grade lubricant compatibility confirmed by Korea Ever-Power before order placement. ISO 9001 certificate supplied for our supplier qualification file."

Lee Jae-hyun  |  Food Processing Equipment Engineer, Gyeonggi Food Machinery Co.  ·  Q3 2025