Product Introduction
1 Inch Air Compressor Oil Level Sight Glass
G1 Inch Threaded Oil Mirror for Crankcase and Lubrication-System Monitoring
Seasummer 1 inch air compressor oil level sight glass
A Simple Way to Monitor Oil Level and Condition
The 1 inch oil level sight glass provides a convenient viewing point on an air-compressor crankcase, gearbox, oil tank or other lubricated housing. Instead of removing a cover or opening the housing, the operator can look through the window to get a quick visual check of the oil level and condition.
The connection is a G1 inch thread with 11 TPI. The body has an S36 hex section for installation, while the overall height is 18.5mm. A white backing and red center point are visible through the window, making the inspection area easy to identify.
For replacement work, the thread size and installation depth are the first things to compare with the existing sight glass. The position of the viewing window also matters, particularly where the part is installed in a confined area. The body is specified as metal and the viewing lens as transparent; the exact material combination can be confirmed for production orders when required.
Technical Profiles & Materials
G1 Inch Threaded Oil-Port Connection
The sight glass has a 1 inch G1 cylindrical pipe thread. The male thread measures 33.249mm in outside diameter, with a listed female-thread inside diameter of 30.291mm. Thread pitch is 2.309mm, or 11 TPI.
These dimensions should be matched with the existing oil port before installation, especially when replacing a sight glass from another supplier.
Hex Body and Compact Inspection Window
The S36 / 36mm hex section gives a standard tool-engagement surface for fitting the part. Overall height is 18.5mm and the effective viewing diameter is Φ20.0mm.
The relatively compact body makes it suitable for installation on the side of a crankcase, gearbox or oil reservoir where a small inspection point is preferred.
Transparent Window, Indicator and Sealing Ring
The viewing window has a white reflective backing with a red indicator point in the center. This provides a clear visual reference when checking the oil during routine maintenance.
An oil-resistant NBR O-ring is used for sealing. When servicing or replacing the sight glass, the O-ring seat and sealing surface should be checked along with the thread to make sure the new part fits the housing correctly.
Technical Specifications
| ITEM | DETAILS |
| Type | 1 Inch Air Compressor Oil Level Sight Glass |
| Application | Piston air compressors, gearboxes, oil tanks, storage housings and lubrication equipment |
| Code | 1401091 |
| Material | Metal body with transparent sight lens; exact body/lens material to be confirmed for the production order; oil-resistant NBR O-ring |
| Details explanation | G1 inch cylindrical pipe thread; 33.249mm male-thread OD; 30.291mm female-thread ID; 2.309mm pitch / 11 TPI; 11.0mm thread length reference; S36 hex; Φ20.0mm viewing diameter; 18.5mm overall height |
| Brand Name | SeaSummer |
| Operating Temp | -20°C to +120°C |
| Delivery Time | 30 Days |
| Packaging | Cardboard packaging |
Products Application
Air-Compressor Crankcase Oil Check
Mounted on a suitable crankcase oil port, the sight glass gives maintenance personnel a quick way to inspect the oil without opening the housing. The viewing window should remain visible after installation, with enough clearance around the S36 / 36mm hex for a tool.
Gearbox and Oil-Tank Inspection
The same type of oil sight glass can be used on gearboxes, oil tanks and other lubricated housings where a direct visual check is useful. The main points to match are the G1 thread, installation depth, sealing surface and the position of the viewing window.
Routine Maintenance and Replacement
When replacing an existing oil level sight glass, compare the thread, O-ring seat, window and overall installation depth with the original part. A damaged or cloudy window can make routine inspection difficult, while a worn or mismatched sealing interface may lead to leakage.
Quality and Craftsmanship Details
Products Package
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FAQ
Q: What thread does this oil level sight glass use?
A:It uses a 1 inch G cylindrical pipe thread with a listed 2.309mm pitch / 11 TPI. The listed male-thread OD is 33.249mm.
Q: What are the main installation dimensions?
A: The reference thread length is 11.0mm, the hex section is S36 / 36mm, the viewing diameter is Φ20.0mm and the overall height is 18.5mm.
Q: What can be seen through the window?
A:The visible window includes a white reflective backing and a central red indicator point. The exact reading method depends on the housing design and oil level position.
Q: What should be checked before ordering?
A: Confirm the G1 thread, thread depth, S36 clearance, viewing position, oil compatibility, pressure, temperature, sealing requirement and final body/lens material.
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