Oil Level Indicator

Factory-direct oil level indicators with PMMA or PC transparent windows — compact, lightweight sight glasses for monitoring oil levels in gearboxes, compressors, hydraulic power units, and industrial machinery. The transparent plastic window provides clear visibility of oil level and condition without the weight or fragility of glass. Available in multiple thread sizes and body materials.

Key Properties

  • Window material: PMMA (acrylic) or PC (polycarbonate) — impact-resistant and lightweight
  • Body material: Nylon, POM, or aluminum alloy
  • Max. operating temperature: Up to 80°C (PMMA); up to 120°C (PC)
  • Pressure rating: Low-pressure applications (up to 3 bar)
  • Thread standards: BSP, NPT, metric — specify on order
  • Seal: NBR O-ring standard; other materials on request
  • Color indicator: Some models include red/green float for quick level check

Oil Level Indicator vs. Oil Sight Glass

Feature Oil Level Indicator (PMMA/PC) Oil Sight Glass (Brass/SS)
Window material PMMA / PC plastic Borosilicate glass
Max. temperature Up to 120°C Up to 120°C+
Impact resistance High Moderate
Chemical resistance Moderate (oil only) High
Cost Lower Higher

Typical Applications

  • Gearboxes and speed reducers — oil level monitoring
  • Air compressors and vacuum pumps — lubricant level check
  • Hydraulic power units — fluid level inspection
  • CNC machines and industrial equipment — routine maintenance
  • Agricultural and construction machinery — field-serviceable oil check

Need a custom thread size, body material, or bulk order? Contact us for a quote within 24 hours →