Nylon Gear Rack | Plastic Gear Rack, Custom OEM Manufacturer Machining

Question 1

Will the rack be exposed to regular washing, immersion, or humid outdoor conditions?

Yes → Use POM acetal. Absorbs below 0.2% moisture vs 1.5-3.5% for nylon — tooth pitch stays accurate after wash-down. Preferred for food-processing lines, pharmaceutical packaging, and outdoor gate systems in wet climates.
No → Continue to Q2.

Question 2

Is the operating temperature above 100°C or is creep under sustained load a concern?

Yes → Use GF30-PA66. 30% glass fibre raises stiffness and creep resistance and extends continuous temperature limit to 150°C. Note: GF content is abrasive to soft metal pinions — use a steel pinion.
No → Continue to Q3.

Question 3

Is face width above 30 mm, or annual cycle count above 500,000?

Yes → Use MC nylon (MC901). Cast nylon has far higher molecular weight than extruded PA, giving better fatigue resistance and wear life at heavy section and high cycle count. Available in oil-impregnated blue grade for extended dry-run life.
No → Continue to Q4.

Question 4

Standard light-duty drive — gate, conveyor diverter, consumer automation?

Cost-critical → Use PA6. Lowest cost, easy to machine, adequate for loads below 200 N in controlled indoor environments.
Performance-first → Use PA66. Higher tensile strength and lower moisture uptake than PA6; the most common all-round nylon rack grade for industrial and residential applications.

🌿 Greenhouse and Agricultural

Ventilation window drives, shading screen actuators, and irrigation boom systems in greenhouses run in humid, salt-laden air where steel racks corrode rapidly. Flexible nylon racks can be bent to follow curved ventilation rail paths, simplifying installation. Module M4 or M6 PA66 is the standard specification. Long total travel lengths use butted sections with half-tooth ends.

🏽 Sliding Gates and Automated Doors

Residential, commercial, and industrial automated sliding gates use nylon racks where quiet operation is required — particularly in residential settings where steel rack noise would disturb neighbours during night-time opening. Module M4 PA66 nylon racks in 1,000 mm sections with half-tooth ends are the European standard for residential gate motor systems.

🦻 Food Processing and Pharmaceutical

Conveyor diverter gates, product pusher arms, and packaging lane indexing use POM or food-grade PA66 racks that withstand wash-down with water and sanitiser. POM is preferred in direct-product-contact zones because its very low moisture absorption maintains pitch accuracy after repeated wetting. FDA-compliant POM and natural PE grades available on request.

🤖 Robotics and Light Automation

End-effector positioning arms, semiconductor wafer handling, medical imaging stages, and cleanroom linear drives specify nylon or POM racks where lubricant contamination is prohibited. The low axis inertia of a plastic rack is a further advantage in high-acceleration pick-and-place systems where minimising moving mass directly reduces cycle time.

🚚 Material Handling and Conveyors

Conveyor transfer diverters, carton pusher arms, and pallet lane management systems in distribution centres and warehouses use PA66 or MC nylon racks for quiet, maintenance-free operation. The self-lubricating surface eliminates the oil spray and drip that a steel rack drive would require near packaging lines and finished goods.

🚘 Automotive and Consumer Products

Adjustable seat mechanisms, sunroof drives, power window regulators, and height-adjustable furniture use nylon racks for their combination of quiet operation, low weight, and corrosion immunity in the humid cabin environment. MC nylon at larger modules is used in hospital bed height-adjustment drives and dental chair positioning systems where higher loads are combined with a strict no-lubricant requirement.

🌡 Thermal Expansion

Nylon expands approximately 5-8 times more than steel per degree Celsius. For a 1,000 mm PA66 rack, the length change from 10°C to 40°C is approximately 1.5 mm. For long butted-section systems, leave a gap of 0.5-1.0 mm at each joint — do not press sections hard together or the rack will bow in summer heat.

💧 Moisture Conditioning

PA6 and PA66 absorb atmospheric moisture causing a small dimensional increase — typically 0.2-0.3% linear growth at 50% RH indoors. Store nylon racks sealed in polyethylene bags before installation and allow them to reach equilibrium humidity before final alignment. POM requires no conditioning.

🔧 Fastener Torque

Do not over-torque mounting fasteners — nylon cold-flows under the fastener head if clamped too tightly, causing the rack to bow and lose pitch accuracy over time. Use a flat washer under each fastener head and torque to 40-60% of the value used for a steel rack of the same cross-section.

🔌 Centre Distance

Set pinion centre distance to provide light tip clearance against the nylon rack — a small amount of backlash is beneficial because the nylon tooth surface will compress slightly under load. A zero-backlash preloaded arrangement that works with a steel rack will generate excessive tooth stress on a nylon rack; allow 0.1-0.2 mm backlash for standard duty.

ISO 9001:2015 and Quality Certificates

Documentation supplied with every order:

• Material datasheet — polymer grade, mechanical properties, operating limits
• Batch inspection record — tooth pitch, face width, section length, straightness
• Dimensional report — critical dimensions verified against drawing
• Packing list with part number, quantity, and batch reference

Plastic Gears

Nylon and POM pinions for all-plastic, lubrication-free rack and pinion drives.

View Products

Ingranaggi cilindrici

Steel spur pinions to mesh with nylon racks — the most common paired configuration.

View Products

Ingranaggi elicoidali

Helical pinions for quieter, higher-load rack drives and speed reducer stages.

View Products

Planetary Gear Sets

Compact reducers for servo motor to pinion shaft in precision plastic rack drives.

View Products

Ingranaggi conici

Right-angle drive stages for compact gear motor input to the rack pinion shaft.

View Products

Worm Gear Wheels

Self-locking worm reducers for vertical rack axes holding position without a motor brake.

View Products

Corone dentate

Large-diameter ring gears for rotary kilns, slewing drives, and large machinery.

View Products

What is the maximum load a nylon gear rack can handle?

Load capacity depends on material grade, module, and face width. As a practical guideline: PA66 in M3 with 15 mm face width sustains approximately 150-250 N tangential tooth load; M4 with 20 mm face sustains 300-500 N. MC nylon at the same dimensions handles approximately 30-40% higher loads due to greater molecular weight. For loads above 1 kN, a steel gear rack is the correct choice. Send us your required force, speed, and module and we will verify feasibility.

Can a nylon rack mesh with a steel pinion, or must the pinion also be plastic?

A nylon rack can — and usually should — mesh with a steel pinion. The mixed pair gives the best balance of drive performance: the steel pinion provides stiffness and tooth accuracy, while the nylon rack provides noise absorption, self-lubrication, and corrosion resistance. The softer nylon rack wears preferentially, protecting the harder pinion. Fully plastic pairs are used only where metal is prohibited — high-field MRI environments or certain cleanrooms — at the cost of lower load capacity and faster wear.

PA6, PA66, or MC nylon — which grade should I choose?

PA6 is the low-cost entry grade for light-duty drives in dry indoor environments. PA66 is the most common industrial choice — higher tensile strength, lower moisture absorption, better performance at 100-130°C; covers the majority of sliding gate, conveyor, and greenhouse applications. MC nylon is preferred when the rack cross-section is large, the cycle count is very high, or impact loads are a factor. POM is the correct choice whenever the rack will be wet or washed repeatedly — its very low moisture uptake (below 0.2%) maintains tooth accuracy that would drift in a nylon rack under repeated wetting.

How do I join multiple nylon rack sections for long-travel drives?

Ever-Power supplies nylon racks with precision half-tooth machined ends on request. When sections are butted end-to-end and fastened to the machine base, the half-tooth geometry maintains correct tooth pitch across the joint. Leave a gap of 0.5-1.0 mm at each butt joint to accommodate thermal expansion. For outdoor greenhouse installations, apply a thin bead of neutral-cure silicone sealant to the butt face before joining to prevent moisture ingress and nylon swelling at the joint, which would otherwise introduce pitch error at that position over time.