{"id":1662,"date":"2026-07-16T09:10:09","date_gmt":"2026-07-16T09:10:09","guid":{"rendered":"https:\/\/gearrack.top\/product\/worm-and-wheel-high-precision-brass-m3-m12-201-3001\/"},"modified":"2026-07-16T09:10:13","modified_gmt":"2026-07-16T09:10:13","slug":"worm-and-wheel-high-precision-brass-m3-m12-201-3001","status":"publish","type":"product","link":"https:\/\/gearrack.top\/it\/product\/worm-and-wheel-high-precision-brass-m3-m12-201-3001\/","title":{"rendered":"Worm and Wheel – High Precision Brass, M3-M12, 20:1-300:1"},"content":{"rendered":"
\n

<\/p>\n

Product Overview<\/h2>\n
\n
\n \"Worm\n <\/div>\n
\n

Worm and wheel<\/strong> \u2014 also called worm gear transmission \u2014 is a gear pair in which a helical screw-form worm meshes with a mating worm wheel to transmit motion and power between two shafts whose axes are perpendicular and non-intersecting. The standard shaft angle is 90\u00b0. The worm resembles a bolt externally; the worm wheel resembles a helical spur gear. What makes the worm-and-wheel pair unique is the tooth contact geometry: the worm wheel tooth face is curved in the axial direction to partially envelop the worm thread, so the mating surfaces meet in line contact<\/strong> rather than the point contact that occurs in crossed-helical (skew) gears. This conformal contact dramatically increases the load capacity of the pair and is the geometric foundation of Korea Ever-Power’s high-precision brass worm and wheel sets.<\/p>\n

Korea Ever-Power supplies custom special high-precision worm and wheel<\/a> sets for transmission \u2014 manufactured in brass, C45 steel, stainless steel, copper, POM, aluminium, and alloy steel. Module M3, M4, M5, M8, M12, and custom. Payment before shipment; T\/T, L\/C. Sample fee refunded on bulk order. Reverse engineering from damaged gear accepted. All metric sizes available.<\/p>\n<\/p><\/div>\n<\/div>\n

If a large gear reduction ratio is needed, the worm and wheel is the solution. Reduction ratios of 20:1 are typical; ratios as high as 300:1 or more are achievable in a single stage. For worm transmissions with lead angle smaller than the equivalent friction angle, the mechanism is self-locking: the worm can drive the wheel, but the wheel cannot back-drive the worm \u2014 eliminating the need for a separate brake or backstop in lifting and positioning applications.<\/p>\n

<\/p>\n

Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Worm and Wheel \u2014 Product Specification<\/th>\n<\/tr>\n<\/thead>\n
Module<\/strong><\/td>\nM3, M4, M5, M8, M12 \u2014 custom modules per drawing<\/td>\n<\/tr>\n
Material<\/strong><\/td>\nBrass, C45 steel, stainless steel, copper, POM, aluminium, alloy steel<\/td>\n<\/tr>\n
Worm Wheel Material<\/strong><\/td>\nCast tin bronze, aluminium iron bronze, cast iron (standard); brass, POM (light duty)<\/td>\n<\/tr>\n
Surface Treatment<\/strong><\/td>\nZinc-plated, nickel-plated, passivation, oxidation, anodisation, Geomet, Dacromet, black oxide, phosphatising, powder coating, electrophoresis<\/td>\n<\/tr>\n
Standard<\/strong><\/td>\nISO, DIN, ANSI, JIS, BS \u2014 and non-standard<\/td>\n<\/tr>\n
Precision Grade<\/strong><\/td>\nDIN 6, DIN 7, DIN 8, DIN 9<\/td>\n<\/tr>\n
Teeth Treatment<\/strong><\/td>\nHardened, milled, or ground<\/td>\n<\/tr>\n
Tolerance<\/strong><\/td>\n0.001 mm \u2013 0.01 mm \u2013 0.1 mm<\/td>\n<\/tr>\n
Transmission Ratio Range<\/strong><\/td>\n20:1 typical; up to 300:1 single stage<\/td>\n<\/tr>\n
Shaft Angle<\/strong><\/td>\n90\u00b0 standard<\/td>\n<\/tr>\n
Confezione<\/strong><\/td>\nPlastic bag + cartons or wooden packing<\/td>\n<\/tr>\n
Payment Terms<\/strong><\/td>\nT\/T, L\/C (payment before shipment)<\/td>\n<\/tr>\n
Sample Lead Time<\/strong><\/td>\n20 business days<\/td>\n<\/tr>\n
Bulk Lead Time<\/strong><\/td>\n25 business days<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Worm and Wheel \u2014 Meshing Conditions and Geometry<\/h2>\n

\"Customized<\/p>\n

For a worm and wheel pair to mesh correctly, two mandatory conditions must be satisfied simultaneously:<\/p>\n

\n

Condition 1 \u2014 Module and Pressure Angle Equality:<\/strong>
\nThe axial module and axial pressure angle of the worm must equal the transverse module and transverse pressure angle of the worm wheel in the middle plane. In standard worm gearing, the axial module of the worm is the standard module value; the transverse pressure angle of the worm wheel equals the axial pressure angle of the worm (standard 20\u00b0).<\/p>\n

Condition 2 \u2014 Helix Direction Match:<\/strong>
\nThe helix direction of the worm wheel must match the helix direction of the worm. A right-hand worm mates with a right-hand worm wheel; a left-hand worm with a left-hand worm wheel. Mixing helix hands prevents mesh engagement and is the most common cause of incorrect worm gear set assembly.<\/p>\n<\/div>\n

The line-contact geometry of the worm wheel \u2014 achieved by the crowned (arc-shaped in the axial cross-section) tooth face that partially envelops the worm thread \u2014 is what distinguishes a proper worm gear from a simple crossed-helical gear. The line contact produces 3\u20135 times higher load capacity than point contact at the same module and centre distance. Korea Ever-Power controls the worm wheel crowning geometry to achieve confirmed line contact across the full face width in every matched worm and wheel set delivered.<\/p>\n

<\/p>\n

Six Characteristics of Worm and Wheel Transmission<\/h2>\n

\"Ever-Power<\/p>\n

\n
\n

\u2460 Large Transmission Ratio \u2014 Compact<\/h3>\n

Single-stage ratios of 20:1 to 300:1 in a right-angle package smaller than an equivalent planetary or spur gear multi-stage train. The ratio i = Zwheel<\/sub> \/ nstarts<\/sub> (worm wheel teeth \/ worm thread starts). More compact than crossed-shaft helical gear mechanisms at the same ratio \u2014 ideal for applications where both high ratio and small footprint are required simultaneously.<\/p>\n<\/p><\/div>\n

\n

\u2461 Line Contact \u2014 High Bearing Capacity<\/h3>\n

The enveloping tooth geometry produces line contact between the meshing surfaces \u2014 the worm wheel’s concave tooth face wraps around the worm thread, distributing the contact load across a line rather than a point. This conformal contact gives worm-and-wheel transmission significantly higher bearing capacity than crossed-helical gears at the same module, and is the geometric explanation for the high torque density achievable in compact worm reducers.<\/p>\n<\/p><\/div>\n

\n

\u2462 Multi-Tooth Meshing \u2014 Smooth and Quiet<\/h3>\n

Worm drive is equivalent to a helical gear drive \u2014 it is a multi-tooth meshing drive where several worm wheel teeth engage the worm thread simultaneously at any instant. This simultaneous multi-tooth contact averages out individual tooth errors, reduces the transmission error at the mesh frequency, and produces smooth, low-vibration, low-noise operation \u2014 quieter than equivalent spur or even helical gear pairs at the same power and ratio.<\/p>\n<\/p><\/div>\n

\n

\u2463 Self-Locking \u2014 Safety Protection<\/h3>\n

When the worm lead angle is smaller than the equivalent friction angle between the meshing surfaces, the transmission is self-locking: the worm can drive the wheel, but the wheel cannot back-drive the worm. This reverse self-locking property provides built-in safety protection in heavy machinery lifting drives \u2014 if the motor fails or power is lost, the load cannot lower the worm, preventing uncontrolled descent without a separate brake.<\/p>\n<\/p><\/div>\n

\n

\u2464 Lower Efficiency \u2014 Design Consideration<\/h3>\n

The high relative sliding velocity between the worm thread and worm wheel tooth produces significant friction losses \u2014 efficiency ranges from 40\u201350% at low lead angles (self-locking range) to 80\u201390% at high lead angles (multi-start worms). The high sliding velocity also causes accelerated tooth surface wear and heat generation, requiring good-quality lubricant with anti-wear and anti-scuffing additives, and adequate oil cooling in high-duty-cycle applications.<\/p>\n<\/p><\/div>\n

\n

\u2465 Large Axial Worm Force<\/h3>\n

The worm transmits torque through an axial thrust force on the worm shaft, which is reacted by the worm shaft bearings. The axial force Fa<\/sub> = 2T \/ dworm<\/sub>, where T is the worm shaft torque and dworm<\/sub> is the worm pitch diameter. For high-torque worm drives, the worm shaft axial bearing selection is critical \u2014 typically angular contact or tapered roller bearings arranged in pairs to handle both the axial and radial loads on the worm shaft simultaneously.<\/p>\n<\/p><\/div>\n<\/div>\n

<\/p>\n

Worm Wheel Material Selection<\/h2>\n

\"measuring<\/p>\n

The worm wheel material is the most critical material selection decision in a worm and wheel pair. The worm is almost always made of hardened steel (case-hardened or nitrided, ground); the worm wheel material is selected based on the sliding speed, duty cycle, and cost target:<\/p>\n

\n
\n

Cast Tin Bronze (GB: ZCuSn10P1)<\/h3>\n

The standard high-duty worm wheel material. Excellent anti-friction properties, excellent anti-scuffing (galling) resistance, and good conformability \u2014 the bronze yields slightly under contact stress, improving the actual contact area progressively during run-in. Price is higher than aluminium bronze due to the tin content. Slightly lower ultimate strength than aluminium bronze. Best for:<\/strong> all high-duty, continuous-operation worm drives where long service life is the primary requirement.<\/p>\n<\/p><\/div>\n

\n

Aluminium Iron Bronze (GB: ZCuAl10Fe3)<\/h3>\n

Higher ultimate tensile strength than tin bronze, lower cost, good wear resistance. Slightly inferior anti-friction and anti-scuffing properties compared with tin bronze \u2014 requires better lubrication conditions and lower sliding velocity to achieve equivalent service life. Best for:<\/strong> medium-duty worm drives where cost is a consideration and the sliding speed is moderate (\u2264 5 m\/s).<\/p>\n<\/p><\/div>\n

\n

Cast Iron (Grey \/ Ductile)<\/h3>\n

Grey cast iron: adequate for low-speed, non-critical worm drives with sliding velocity \u2264 1 m\/s. Ductile (nodular) cast iron: better toughness, suitable for low-speed medium-duty. Aging treatment required for cast iron worm wheels to relieve residual casting stress and prevent dimensional distortion in service. Best for:<\/strong> open drives, low-speed index drives, and cost-sensitive non-critical applications.<\/p>\n<\/p><\/div>\n

\n

Brass (for Light Duty)<\/h3>\n

Brass worm wheels (see Korea Ever-Power’s dedicated Brass Worm Wheel product) are used for light-duty, low-sliding-velocity worm drives \u2014 consumer electronics, instruments, and light mechanisms. Brass machines easily to fine tolerances at small modules, enables the combination shaft-and-wheel miniature worm sets used in precision instruments, and is corrosion-resistant. Not suitable for high sliding speeds or heavy loads where bronze is required.<\/p>\n<\/p><\/div>\n<\/div>\n

<\/p>\n

Applications<\/h2>\n

\"Ever-Power<\/p>\n

\n
\n
<\/div>\n

Industrial Worm Gear Reducers<\/h3>\n

Tin bronze worm wheels M5\u2013M12 in industrial worm gearbox reducers for conveyor drives, agitator drives, packaging machinery, and material handling equipment. The right-angle output and high single-stage ratio make the worm gearbox the standard compact right-angle reducer for industrial drives requiring 20:1 to 60:1 in one stage.<\/p>\n<\/div>\n

\n
<\/div>\n

Security Gates and Lifting Drives<\/h3>\n

Self-locking worm and wheel sets in security shutter drives, rolling gate actuators, lifting platform drives, and vehicle barrier mechanisms. The self-locking property holds the gate or barrier in position without motor power and prevents back-driving if power is cut \u2014 a required safety feature in security and lifting applications.<\/p>\n<\/div>\n

\n
<\/div>\n

Automatic Control Machines<\/h3>\n

High-precision worm and wheel sets in CNC rotary table drives, indexing heads, and robotic wrist joint drives where the right-angle output and high ratio are required in a compact, backlash-controlled assembly. Korea Ever-Power’s DIN 6\u20137 worm and wheel sets provide the accuracy needed for positioning and indexing applications.<\/p>\n<\/div>\n

\n
\u2600\ufe0f<\/div>\n

Solar Energy Tracking<\/h3>\n

Alloy steel worm and wheel sets in solar tracker azimuth and elevation drives. The worm gear’s self-locking property holds the solar panel at the correct angle without motor power between tracking steps, reducing energy consumption and extending motor life in solar tracker drives that run for 25+ years in outdoor environments.<\/p>\n<\/div>\n

\n
<\/div>\n

Machine Tools<\/h3>\n

Precision worm and wheel sets DIN 6\u20137 in lathe cross-slide drives, milling machine table feeds, and grinding machine wheel dresser drives. Machine tool worm drives require fine pitch control (low backlash), smooth low-speed motion (no stick-slip), and adequate rigidity \u2014 all achievable with Korea Ever-Power’s ground worm thread and precision-hobbed bronze worm wheel sets.<\/p>\n<\/div>\n

\n
<\/div>\n

High-Speed Rail and Aviation<\/h3>\n

Alloy steel worm and wheel sets in aircraft flap actuator drives, rail switch machine drives, and aircraft ground support equipment steering drives. These applications require full material traceability, precision tooth grinding, and independent inspection confirmation \u2014 all supplied by Korea Ever-Power with each batch delivery.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Frequently Asked Questions<\/h2>\n
\n
\n

Can Korea Ever-Power accept payment after shipment?<\/p>\n

No \u2014 Korea Ever-Power only accepts payment before shipment. Standard payment terms are T\/T or L\/C. The sample fee and freight are paid by the customer; after the sample is confirmed, the sample fee is refunded when the bulk order is placed. This payment structure ensures both parties’ commitments are clear before production and shipment begin.<\/p>\n<\/div>\n

\n
\n

Can Korea Ever-Power manufacture worm and wheel sets not listed on the website?<\/p>\n

Yes \u2014 all standard and custom worm and wheel sets are available with the same excellent delivery options. We have tooling to manufacture any metric module. For non-standard configurations (unusual ratios, non-standard centre distances, or special materials), send the drawing or specification and Korea Ever-Power will confirm feasibility and lead time. Reverse engineering from a damaged worm and wheel set is also available.<\/p>\n<\/div>\n

\n
\n

How do I get the lowest price on worm and wheel sets?<\/p>\n

Increasing order quantity reduces the unit price \u2014 the more parts ordered, the lower the price. Material selection also significantly affects cost: cast iron worm wheels are the least expensive; aluminium iron bronze is moderate; tin bronze is higher due to tin content; stainless steel is the highest. Send the specification and target quantity and Korea Ever-Power will provide a tiered price schedule. Contact our team<\/a> to begin.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Customer Reviews<\/h2>\n
\n
\n

“We manufacture industrial conveyor drive worm gearboxes and source tin bronze worm and wheel<\/a> sets M8 from Korea Ever-Power. The worm thread grinding and worm wheel hobbing quality produced confirmed line contact across 85% of the face width at our incoming contact pattern check. No scuffing failures in 14 months of continuous operation at 3 m\/s sliding velocity. Lead time 24 business days bulk \u2014 within the 25-day commitment.”<\/p>\n

Kim Jae-hyeon<\/strong>  |  Worm Gearbox Design Engineer, Incheon Industrial Drive Systems Co.  ·  Q1 2026<\/em><\/p>\n<\/div>\n

\n

“We build solar tracker azimuth drives and specified alloy steel worm and wheel sets with self-locking lead angle from Korea Ever-Power. Self-locking confirmed at our test bench: applied 120% rated torque to the wheel shaft \u2014 zero back-drive rotation recorded. Panel position holds without motor power. 30 tracker units installed and operating for 18 months without worm gear maintenance.”<\/p>\n

Lee Seong-min<\/strong>  |  Solar Tracker Actuator Engineer, Gyeonggi Renewable Energy Systems Co.  ·  Q4 2025<\/em><\/p>\n<\/div>\n

\n

“We needed a non-standard worm and wheel set \u2014 M5, 75:1 ratio (3-start worm, 225-tooth wheel), stainless steel worm with POM wheel for a food processing application requiring FDA-compliant materials. Korea Ever-Power confirmed feasibility, produced a sample in 22 business days, and confirmed mesh pattern and backlash before bulk production. No material issues at FDA inspection.”<\/p>\n

Park Min-cheol<\/strong>  |  Food Processing Machine Engineer, Busan Food Machinery Co.  ·  Q2 2026<\/em><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Related Products<\/h2>\n
\n
\"Ingranaggio<\/a><\/p>\n
\n

Worm Gears<\/h3>\n

Plastic worm gears, brass worm wheels, cylindrical worm wheels, duplex worm gears and more.<\/p>\n

Browse \u2192<\/a><\/div>\n<\/div>\n

\"Planetary<\/a><\/p>\n
\n

Planetary Gears<\/h3>\n

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Browse \u2192<\/a><\/div>\n<\/div>\n

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Ring Gears<\/h3>\n

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Browse \u2192<\/a><\/div>\n<\/div>\n

\"Spur<\/a><\/p>\n
\n

Spur Gears<\/h3>\n

Steel, stainless, plastic spur gears \u2014 all modules and materials.<\/p>\n

Browse \u2192<\/a><\/div>\n<\/div>\n

\"Helical<\/a><\/p>\n
\n

Helical Gears<\/h3>\n

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Browse \u2192<\/a><\/div>\n<\/div>\n

\"Ingranaggi<\/a><\/p>\n
\n

Ingranaggi conici<\/h3>\n

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Browse \u2192<\/a><\/div>\n<\/div>\n<\/div>\n

\n

Request a Quotation for Worm and Wheel Sets<\/h3>\n

M3\u2013M12 standard; custom modules per drawing. Brass, tin bronze, aluminium bronze, C45, SS, POM. Sample 20 days; bulk 25 days. T\/T \/ L\/C. All metric sizes and reverse engineering accepted.<\/p>\n

Get a Quote Now<\/a>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Custom special high-precision brass worm and worm wheel sets for transmission. Module M3, M4, M5, M8, M12 and custom. Materials: brass, C45 steel, stainless steel, copper, POM, aluminium, alloy. Surface treatment: zinc-plated, nickel-plated, black oxide, Geomet, Dacromet, passivation, powder coating, electrophoresis. Standard: ISO, DIN, ANSI, JIS, BS and non-standard. Precision: DIN 6\u20139. Teeth treatment: hardened, milled or ground. Tolerance: 0.001 mm\u20130.1 mm. Transmission ratio 20:1 typical; up to 300:1 single stage. 90\u00b0 shaft angle standard. Line contact \u2014 3\u20135\u00d7 higher load capacity than crossed-helical gears. Self-locking available. Sample 20 days; bulk 25 days. T\/T, L\/C. Packaging: plastic bag + cartons or wooden packing.<\/p>","protected":false},"featured_media":1663,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[4562],"product_tag":[],"class_list":["post-1662","product","type-product","status-publish","has-post-thumbnail","product_cat-worm-gear","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/gearrack.top\/it\/wp-json\/wp\/v2\/product\/1662","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gearrack.top\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/gearrack.top\/it\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/gearrack.top\/it\/wp-json\/wp\/v2\/comments?post=1662"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gearrack.top\/it\/wp-json\/wp\/v2\/media\/1663"}],"wp:attachment":[{"href":"https:\/\/gearrack.top\/it\/wp-json\/wp\/v2\/media?parent=1662"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/gearrack.top\/it\/wp-json\/wp\/v2\/product_brand?post=1662"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/gearrack.top\/it\/wp-json\/wp\/v2\/product_cat?post=1662"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/gearrack.top\/it\/wp-json\/wp\/v2\/product_tag?post=1662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}