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LDI INDUSTRIES

LDI Industries is a manufacturer of lubrication and fluid-level monitoring components for industrial machinery. The company's product line centers on oil level gauges, constant-level oilers, and metered lubrication systems used in gearboxes, hydraulic reservoirs, bearing housings, compressors, and pump reservoirs. LDI Industries products are distributed globally, and 3G Electric supplies the line as part of its industrial equipment catalog.

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About LDI INDUSTRIES

LDI Industries is a manufacturer of lubrication and fluid-level monitoring components for industrial machinery. The company's product line centers on oil level gauges, constant-level oilers, and metered lubrication systems used in gearboxes, hydraulic reservoirs, bearing housings, compressors, and pump reservoirs. LDI Industries products are distributed globally, and 3G Electric supplies the line as part of its industrial equipment catalog.

The LDI Industries range includes several distinct families. Closed high-pressure oil level gauges, such as the G615-12-A-1, are built for pressurized systems and feature a sight height of 10 1/2 inches, a 1/2"-20 UNF male connection, and an integrated thermometer for fluid temperature monitoring. Vented oil level gauges, including the G400 and G200 series, provide visual level indication while allowing air to escape to prevent pressure buildup; these are available with 1/4", 3/8", and 1/2" NPTF connections, sight heights from 2 1/4 to 4 1/4 inches, and Buna N seals rated to 250°F. Air-operated closed constant-level oilers, such as the A/OR205 series, automatically maintain oil level in bearing housings, gearboxes, and pump reservoirs; the plastic unit has a 26 oz capacity, a 9-inch overall height, and a 1/4"-20 UNF mounting thread. Precision metering lubrication systems, including the 1TMU1 and 1TMU2, are machine-mount oil-dispensing units with 0.5 or 1 qt reservoirs, 4 or 8 NPT feeds, a 9:0 pump ratio, and an integrated timer for automated lubrication cycles.

These components are specified by plant engineers and maintenance managers for applications where reliable lubrication and accurate fluid-level indication are required. The gauges and oilers are constructed with Buna N seals for compatibility with petroleum-based lubricants and are rated for operating temperatures up to 250°F in vented configurations. Connection types include NPTF and UNF threads to match common port standards. 3G Electric stocks a broad selection of LDI Industries SKUs—over 110 part numbers—covering oil level gauges, drip-feed oilers, valves, and metering systems. The catalog includes closed and vented gauges in multiple sight heights and connection sizes, constant-level oilers in plastic and metal, and metered lubrication systems with varying feed counts and reservoir capacities. 3G Electric supports the line with global shipping and technical product data, allowing buyers to match thread type, seal material, temperature rating, and capacity to their specific equipment requirements.

Common Applications

  • Hydraulic power units — LDI Industries closed high-pressure oil level gauge G615-12-A-1 with thermometer for pressurized reservoir monitoring
  • Gearbox lubrication — LDI Industries vented oil level gauge G421-3 with 3/8" NPTF female connection and 4 1/4 in sight height
  • Bearing housing oil level maintenance — LDI Industries air-operated constant-level oiler A/OR205 with 26 oz capacity and 1/4"-20 UNF mounting
  • Compressor crankcase — LDI Industries vented oil level gauge G261-3 with 3/8" NPTF male connection and Buna N seal
  • Machine tool lubrication — LDI Industries precision metering lubrication system 1TMU1 with 8 NPT feeds and 0.5 gal reservoir
  • Pump reservoir level indication — LDI Industries vented oil level gauge G404-2 with 1/4" NPTF female connection and 2 1/4 in sight height

Guides & Resources

Frequently asked questions

Common questions about LDI INDUSTRIES from 3G Electric.

What is the difference between LDI Industries closed and vented oil level gauges?

Closed high-pressure oil level gauges, such as the G615-12-A-1, are designed for pressurized systems and do not vent to atmosphere. They typically include a thermometer and use a UNF male connection. Vented oil level gauges, including the G400 and G200 series, allow air to escape to prevent pressure buildup in reservoirs and gearboxes. Vented models are available with NPTF female or male connections, sight heights from 2 1/4 to 4 1/4 inches, and Buna N seals rated to 250°F. Selection depends on whether the reservoir operates under pressure or at atmospheric conditions.

What capacity and mounting options are available for LDI Industries air-operated constant-level oilers?

The LDI Industries air-operated closed constant-level oiler, represented by the A/OR205 series, has a 26 oz capacity and a 9-inch overall height. It features a 1/4"-20 UNF mounting thread and includes two pipe plugs for filler and equalizer ports. The unit is made of plastic and is designed to automatically maintain oil level in bearing housings, gearboxes, and pump reservoirs. It uses a single feed type. For specific mounting configurations or larger capacities, consult the LDI Industries catalog or contact 3G Electric for available SKUs.

What are the feed and reservoir options for LDI Industries precision metering lubrication systems?

LDI Industries precision metering lubrication systems are machine-mount oil-dispensing units available with either a 0.5 gal reservoir and 8 NPT feeds (SKU 1TMU1) or a 1 qt reservoir and 4 NPT feeds (SKU 1TMU2). Both include a timer for automated lubrication cycles and have a pump ratio of 9:0. These systems deliver metered oil to multiple points and are used where consistent, timed lubrication is required. The NPT connections allow integration with standard piping. Reservoir capacity and feed count should be matched to the number of lubrication points and the desired service interval.

What seal material and temperature rating do LDI Industries vented oil level gauges use?

LDI Industries vented oil level gauges, including the G400 and G200 series, use Buna N seals. The maximum temperature rating for these vented gauges is 250°F. Buna N is compatible with petroleum-based lubricants and many industrial fluids. The gauges are available with 1/4", 3/8", or 1/2" NPTF connections, either male or female, and sight heights of 2 1/4 or 4 1/4 inches. They do not include a thermometer. For applications outside these temperature or fluid compatibility limits, alternative seal materials or gauge types may be required.

Which LDI Industries oil level gauges include a thermometer?

The LDI Industries closed high-pressure oil level gauge, model G615-12-A-1, includes a thermometer for fluid temperature monitoring. This gauge has a 10 1/2 inch sight height, a 13.62 inch body height, and a 1/2"-20 UNF male connection. Vented oil level gauges in the G400 and G200 series do not include a thermometer. If temperature indication is required on a vented reservoir, a separate thermometer or a different gauge model would be needed. 3G Electric stocks both thermometer-equipped and non-thermometer LDI Industries gauges.

What thread types are available on LDI Industries oil level gauges?

LDI Industries oil level gauges are offered with several thread types. Closed high-pressure gauges, such as the G615-12-A-1, use a 1/2"-20 UNF male connection. Vented gauges in the G400 and G200 series are available with 1/4", 3/8", or 1/2" NPTF connections, in either female or male configurations. For example, the G421-3 has a 3/8" NPTF female connection, the G261-3 has a 3/8" NPTF male connection, and the G404-2 has a 1/4" NPTF female connection. Thread type must match the port on the reservoir or gearbox.