FAMILY 02 · SIBLING COMPONENT
2.2 Encoder Protective Back Covers
Impact-resistant, dustproof rear enclosures shielding optical and magnetic motor encoders.
Explore Encoder Covers →Home › Products › 02 End Caps & Covers › Motor End Caps
Precision Plastic Motor End Caps & Bearing Housings (PA66 / PPS)
Front and rear structural motor end housings engineered to seal internal stator/rotor assemblies, locate ball or sleeve bearings, and dampen operational vibration. Molded with DuPont/BASF modified UL94 V-0 PA66+GF and PPS as a lightweight, electrically insulating replacement for die-cast metal end bells.
✓ 100% Bearing Bore Concentricity QC
✓ Tight Snap-Fit Bobbin Locking
✓ Anti-Blistering 200°C+ Thermal Stability
PRECISION TOLERANCE
±0.02mm Bearing Bore
CORE POLYMERS
PA66+GF, PPS, PBT+GF, Phenolic
SAFETY & COMPLIANCE
UL94 V-0 · RoHS/REACH
TOOLING & LEAD TIME
15–25 Days T1 · 7–10 Days Insert Swap
WHY ENGINEERS CHOOSE RUNHENG MOTOR END CAPS
Engineered for Coaxial Bearing Alignment, Low Noise & Zero Thermal Warping
01. High Bearing Bore Concentricity (±0.02mm)
Machined via high-speed CNC and Swiss Charmilles Wire EDM, our mold cores maintain strict bearing pocket roundness and coaxiality—eliminating rotor rubbing and reducing motor running noise.
02. Zero Blistering or Cracking Under Heat
Pre-modified UL94 V-0 PA66+GF and PPS compounds resist thermal blistering, dimensional creep, and warping during prolonged high-temperature motor operation.
03. Precision Snap-Fit & Pilot Alignment
Crisp, burr-free locking hooks and pilot rabbet diameters snap seamlessly onto original motor bobbins and stator housings without loosening under vibration.
04. Integrated Brush Holders & Terminal Slots
Complex internal features—such as carbon brush guides, thermal protector pockets, and lead-wire exits—are formed in a single molding shot.
TECHNICAL SPECIFICATIONS
Motor Plastic End Cap Engineering Parameters
Available Base Resins
Modified PA66, PA66+GF (15%–35%), PPS, PBT+GF, Phenolic (DuPont / BASF Partners)
Flame Retardancy Grade
UL94 V-0 Certified
Critical Bore & Pilot Tolerance
±0.02mm (100% Outgoing Inspection on Bearing Bore & Snap Dimensions)
Thermal Resistance
150°C to 220°C+ Continuous Operating Temperature
Minimum Wall & Rib Capability
Structural Walls 0.8mm–3.5mm; Thin Insulating Barriers Down to 0.12mm
Mold Machining Standard
High-Speed CNC, Swiss Charmilles Wire EDM & Japanese Sodick Mirror EDM
Quality & Defect Control
≤ 50 PPM Defect Rate; ISO 9001:2015, ISO 14001:2015, UL Process Certified
Environmental Compliance
Full RoHS & REACH Certified
STANDARD & CUSTOM CONFIGURATIONS
Supported Motor End Cap Configurations
Square & Octagonal Stepper/Servo End Caps
Precision front and rear end bells with symmetric mounting thru-holes and recessed bearing seats.
Inquire Standard End Caps → End Caps with Integrated Brush & Connector Pockets
Complex rear housings featuring molded-in terminal blocks, capacitor clips, and wire strain reliefs.
Request Custom Quote → Metal-Bearing Insert Overmolded End Caps
Direct overmolding around bronze sleeve bearings or brass threaded inserts for heavy-load axial retention.
Discuss Insert Molding →HOW WE GUARANTEE CONSISTENCY
How We Guarantee Bearing Alignment & Snap Fit
01. Low-Shrinkage GF-Reinforced Compounding
Controlled glass-fiber dispersion minimizes roundness distortion around the central bearing pocket.
02. Coaxial Core-and-Cavity EDM Tooling
Interlocked mold taper locks ensure zero core shift between the outer housing pilot and inner bearing bore.
03. 100% Bearing Plug-Gauge & Snap-Fit QC
Every production batch undergoes go/no-go bearing bore plug gauging, flatness checks, and mating bobbin assembly testing.
02 / MOTOR END CAPS & PROTECTIVE COVERS FAMILY
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FAMILY 02 · SIBLING COMPONENT
2.3 Cable Clamp & Wire Tray Covers
100% burr-free mirror-molded wire harness covers for strain relief and short-circuit prevention.
Explore Cable Covers →FAMILY 04 · RELATED COMPONENT
4.1 Plastic Motor Mounting Flanges
High-strength structural front mounting flanges with knurled brass threaded inserts.
Explore Mounting Flanges →DIRECT ENGINEERING SUPPORT
Need Motor End Cap Samples or Custom Bearing Housing Molds?
Upload or email your 2D/3D component drawing (STEP, IGES, DWG, PDF) or share your motor frame size. Free standard stock samples are available (freight collect), and custom DFM reviews are returned within 24 business hours.
✓ Free Standard Stock Samples (Freight Collect)
✓ 24-Hour Engineering DFM & Quote Response
✓ 100% NDA Confidentiality Protection
Send Your 2D/3D Drawing or Sample Request
Fill out the project specs below or attach your CAD files. Our engineering team responds within 24 business hours.
