OEM Custom Linear Motion Solutions: From Drawing to Delivery

When Standard Catalogue Products Are Not Enough

Machine tool builders, automation integrators, and specialty equipment manufacturers frequently require linear motion components that deviate from standard catalogue specifications: custom rail lengths, non-standard mounting hole patterns, special preload classes, unique end-machining configurations, or stainless steel variants of products normally offered in chrome steel. Sourcing these custom configurations from a trading company that cannot control production leads to dimensional inconsistencies, extended lead times, and quality documentation gaps.

Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd. operates as a factory-direct manufacturer with in-house capabilities for every stage of customization - from raw material selection through final CMM inspection. This guide walks through the OEM customization process from initial drawing to delivery, with specific examples from Dongfeng's production history.history.

Customization Capabilities by Product Line

Linear Guideways (HGR Series)

• Custom rail lengths: Any length from 100 mm to 4,000 mm cut to specification. Rails over 4,000 mm supplied as joined sections with precision splice joints held to the same accuracy grade as individual rails.
• Custom mounting hole patterns: Non-standard bolt hole pitch, counterbore depths, or dowel pin holes per customer drawing. Available for 500+ piece orders.
• Special preload classes: C0, C1, and C2 standard; intermediate preload values available on request for applications requiring specific rigidity-to-drag ratios.
• Accuracy grade upgrades: SP (3 µm/1,000 mm) and UP (2 µm/1,000 mm) grades available beyond standard H and P grades.
• Stainless steel variant: HGR15-HGR35 available in 9Cr18Mo martensitic stainless (HRC 54-58) for food, medical, and marine applications.

Ball Screws (SFU/SFE/DFU Series)

• Custom end machining: Journal diameters, keyway slots, threaded sections, circlip grooves, and flange machining per 2D drawing or DXF. Compatible with BK/BF bearing blocks or custom housings.
• Special leads and diameters: Non-standard lead-to-diameter ratios for applications requiring specific resolution-speed tradeoffs. Custom leads available for 50+ piece orders.
• Pre-load customization: DFU double-nut pre-load force adjustable from light (P0) through heavy (P2). Pre-load measurement data provided per assembly.
• Stainless steel ball screws: SFU1605-SFU3205 available in 9Cr18Mo stainless for food-grade and medical applications. Note: stainless ball screws have lower hardness (HRC 54-58 vs 58-62) - size one diameter larger than the GCr15 equivalent for equivalent load capacity.

Linear Bearings (LM/LME/LMF/LMK Series)

• H5 precision grade: Available on request for LM8-LM40, LME8-LME40, and LMF8-LMF40. Bore tolerance ±2 µm for measurement and positioning applications.
• Custom seal materials: FKM (Viton) seals for high-temperature applications up to 200°C. Standard NBR seals rated to 110°C.
• Stainless steel variants: LM/LME/LMF/LMK available in 440C stainless steel for washdown and corrosive environments.

The OEM Customization Process: From Drawing to Delivery

Step 1: Technical Drawing Review (Day 1-2)

Submit your 2D drawing, DXF, or dimensional sketch to Dongfeng's technical team. Within 4 hours, our engineers review the drawing for manufacturability, identify any tolerance conflicts or material feasibility issues, and recommend alternatives where the specified configuration is not optimal. For complex customizations, a video call with the production engineer can be arranged.ged.

Step 2: Quotation and Lead Time (Day 2-3)

A formal quotation includes unit pricing based on the customized configuration, tooling setup charges (if applicable), lead time, and the documentation package included with each shipment. Lead times for custom configurations typically run:

• Custom rail lengths: 15-25 business days
• Custom end machining on ball screws: 20-30 business days
• Stainless steel variants: 25-35 business days
• SP/UP accuracy grade upgrades: 30-40 business days

Step 3: Production and Quality Control

Custom orders follow the same production process as standard products, with additional QC checkpoints:

• Raw material verification: Mill certificate with heat number for GCr15 or 9Cr18Mo bar stock, verified against the material specification on the drawing.
• In-process dimensional checks: Custom dimensions verified at each machining stage (turning, grinding, drilling) against the drawing tolerances.
• Final CMM inspection: Full dimensional verification on coordinate measuring machine, with inspection report referencing the customer drawing and lot number.
• Functional testing: Carriage running smoothness, ball screw lead accuracy, and bearing running torque tested per piece on custom orders.

Step 4: Documentation and Packaging (Day -2 to shipment)

Each custom order ships with:

• Material certificate (mill cert) with heat number traceability
• Dimensional inspection report (CMM data) referencing customer drawing
• Hardness test report per lot
• RoHS compliance statement (if required)
• OEM part marking (laser-engraved buyer part number) for 100+ piece orders

Packaging follows export standards: VCI anti-corrosion film, desiccant bags, humidity indicator card, and ISPM-15 compliant plywood cases for ocean freight.

OEM Case Examples

Case 1: Custom HGR35 Rails for German 5-Axis Machining Center

A German machine tool builder required HGR35 rails in P4 accuracy with custom mounting hole positions to match an existing machine base casting. Dongfeng produced 120 sets with CMM-verified hole positions within ±0.02 mm of the drawing datum, achieving 35% reduction in machine assembly time and zero field callbacks for spindle alignment over 12 months.

Case 2: Stainless SFU1605 for US Food Packaging Line

A US food packaging OEM needed corrosion-resistant ball screws for a 200 units/minute packaging line subject to daily washdown. Dongfeng supplied SFU1605 in 9Cr18Mo stainless with NSF H1 grease and double-seal nut wipers. The stainless ball screws operated 24 months without corrosion-related failures, extending maintenance intervals from 6 months to 2 years.

Case 3: MGN12 P2 Guides for Japanese Medical Device Assembly

A Japanese medical device manufacturer required MGN12 miniature guides in P2 accuracy class with 2-micron repeatability for an insulin pump assembly station. Dongfeng supplied stainless MGN12 with individual laser interferometer test certificates documenting sub-2-micron repeatability at 22°C and 28°C, reducing the customer's product rejection rate from 4% to 0.3%..3%.

Getting Started with an OEM Customization Inquiry

To initiate a custom linear motion project with Dongfeng Bearing, provide the following:

1. 2D drawing or DXF showing all critical dimensions, tolerances, and surface finish requirements
2. Annual quantity estimate - affects pricing tier and tooling amortization
3. Application description - load, speed, environment, and accuracy requirements
4. Material specification - GCr15 standard, or stainless 9Cr18Mo / 440C for corrosive environments
5. Documentation requirements - material certs, inspection reports, RoHS, CE Declaration of Incorporation

Our technical team responds within 48 hours with a reviewed drawing, manufacturability feedback, and a detailed quotation. For qualified buyers, sample units of custom configurations are available - sample cost is credited toward production orders of 100+ pieces.