Description

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Precision-machined nuts matched to trapezoidal or ACME lead screws. Two architectural options: Zero-Backlash (axial spring-loaded dual-nut) for bidirectional positioning repeatability (< ±5 µm), and Standard Clearance for continuous unidirectional transport or cost-sensitive manual adjustment axes.

Thread Form: ACME / Trapezoidal (Tr series)

Standard Diameters: Ø6 mm ~ Ø40 mm

Pitch Range: 1 mm ~ 12 mm (Single/Multi-start)

Interface Standard: DIN / ISO / Custom Flange Profiles

Technical Specifications

Parameter	Ampco 18 Bronze Series	POM-C Acetal Series	Torlon PAI Series
Material Designation	CuAl10Fe5Ni5 / Ampco 18	POM-C (Polyacetal)	Polyamide-imide
Max PV Limit	1.75 MPa·m/s	0.15 MPa·m/s	1.40 MPa·m/s
Operating Temp.	-40°C ~ +250°C	-40°C ~ +90°C	-40°C ~ +220°C
Dry Run Capability	Marginal (Oil/Grease recommended)	Self-lubricating (Dry or low lube)	Self-lubricating (High load/temp)
Lead Accuracy Grade	G9 / G7 (10 µm / 300 mm)	G9 (25 µm / 300 mm)	G9 / G7 (10 µm / 300 mm)
Default Backlash	0.02 ~ 0.08 mm (Std)	0.03 ~ 0.10 mm (Std)	0.02 ~ 0.06 mm (Std)

Key Features

Constant-Force Axial Preload Mechanism: Zero-backlash series utilizes calibrated 304 stainless wave springs/compression springs; preload force factory-set at 10% ~ 15% of dynamic load rating to eliminate deadband without binding.

Low-Friction Thread Geometry: Root/crest clearance optimized (0.1 mm radial relief) to prevent particulate jamming in dry laboratory environments.

Material-Specific Tribology:
Ampco 18 bronze prevents galling against rolling-grade stainless steel screws under shock loads.
POM-C provides stick-slip-free motion at low velocity (< 5 mm/s).

Concentricity Control: Flange pilot-to-thread pitch circle runout ≤ 0.015 mm TIR, minimizing whip and eccentric wear.

Applications

Medical Diagnostics: Z-axis pipetting probe drivers (high cycle life, low particle generation).

Optical Inspection/Metrology: Manual/motorized stage fine-adjustment focus locks.

Laboratory Automation: Multi-channel microplate dispenser gantry positioning.

Semiconductor Light Handling: Low-contamination wafer cassette elevation sub-assemblies.

Customization Capabilities

Modify standard SKUs or supply drawings (STEP/IGES/PDF) for OEM integration:

Flange & Mount: Custom bolt-circle diameter (BCD), counterbores, keyways, pin holes, or square block bodies.

Preload Tuning: Specific drag-torque targets (N·cm) for vertical vs. horizontal orientation.

Thread Modifications: Non-standard leads, multi-start helix, left-hand threads, or coated threads (MoS2 dry-film).

Minimum Batch for Custom: 25 pcs per geometry revision.

Quality Control

Thread Form Verification: GO/NO-GO custom threaded ring gauges verified against master thread calibration blocks.

Runout & Geometry: 100% CMM sampling on pilot runlots for flange perpendicularity and pitch diameter.

Wear & Drag Torque Audit: Rotational drag torque logged via digital torque transducer on preloaded assemblies (± 10% tolerance window).

Traceability: Heat-lot number laser-engraved on OD for bronze/PAI batches; material test reports (MTR EN 10204 3.1) supplied upon request.

Manufacturing & Certifications

Machining Assets: Citizen/Star Swiss-type CNC turning centers (OD/ID co-axial turning in single setup) + high-speed 5-axis milling for complex flange geometries.

Thread Generation: Single-point CNC thread whirling / precision hobbing.

Quality Management: ISO 9001:2015 certified facility.

Environmental Compliance: EU RoHS 3 (2015/863/EU) and REACH SVHC compliant material declarations.

Packaging & Delivery

Corrosion Protection: VCI anti-corrosion film bag sealed per batch (bronze/steel components).

Physical Protection: Individual ESD/foam grid pocket tray or anti-roll individual PVC transport tubes; zero inter-part impact during international air/ocean transit.

Incoterms & Logistics: FOB (Ningbo/Shanghai), EXW, or DDP support for US/EU scheduled deliveries via air/ocean forwarding partners. DDP air freight available for US (IL/CA regional distribution hubs) and EU (DE/NL custom-cleared) scheduled forecasts.

Lead Time:
• Standard catalog samples: 3–5 working days.
• Custom geometry prototype: 12–15 working days.
• Production release batches: 20–25 working days (stock safety program available for annual forecasts).

FAQ

Q: How do I select preload force for a vertical Z-axis?

A: Preload force must exceed the hanging payload mass plus carriage friction component by ≥ 30%, while staying below 0.2 × C_dyn to avoid premature thermal wear. Share your mass/acceleration profile for factory calculation.

Q: Can your nuts mate with lead screws rolled by third-party suppliers?

A: Yes, provided the screw complies with ISO/DIN metric trapezoidal tolerance grade 7e/7h. Send screw 3D CAD or major/minor/pitch micrometer data for fit verification.

Q: What lubricant is recommended for bronze nuts under high humidity?

A: EP grease containing PTFE or synthetic PAO base oil (ISO VG 150–220). Avoid water-emulsifying coolants or silicone oils.

Request a Quote / RFQ Submission

To receive a formal quotation within 24 hours, provide:
SKU / Part Number or Drawing (Drop .STEP/.PDF via portal below)
Material Preference (Ampco 18 / POM-C / Torlon)
Backlash Requirement (Zero-backlash vs. Standard ± X mm)
Annual Quantity & Release Schedule
Operating Environment (Load, Speed, Duty Cycle, Temp)

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