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1-1/4" NPTF Threaded Head Spiral Gauges

Carl Frankenfield Photo


The 8685 Junior Top Mount Model Threaded Head Medium Duty Spiral Gauge is designed for use in measuring liquid levels in gasoline, diesel fuel, bio-diesel, hydraulic and lubricating oils where space restrictions prevent the use of a swing-arm style mechanical gauge. It is ideal for medium duty construction & agriculture, lawn & garden, marine and recreational vehicle applications.

General Information & Features

• Field Replaceable Snap-On Fractional Dial
• Solid One-Piece Head Construction, No-Leakage Path to Dial

The Threaded Head mounting of the 8685 Spiral Gauge allows a tight seal that restricts vapor loss. The “Screw In” mounting contributes to the gauges adaptability for use in restricted areas.

The 8685 Threaded Head Spiral Gauge is designed for top mounting with an easy to read fractional dial. It is available in lengths from 6 to 20 inches.


Data Sheet

MS-516 Installation Instructions

General Specifications*


Designed for top mounting only. Gauge uses 1-1/4" NPTF threaded head.


Accuracy depends upon proper gauge sizing. Direct read dials +/-7%. Accuracy may be less depending upon tank shape. Accuracy may be less near full and empty. Accuracy may be less if tank is not level. This gauge is not to be used for filling. All accuracy estimates are expressed as a percent of full scale.


Standard operating range is -40°F to 158°F, -40°C to 70°C.

Shock & Vibration

Suitable to mobile, off-road medium duty, and marine applications.

Tank Pressure

0 to 14.5 PSIG [0 to 1,0 Bar] maximum.

Tank Opening Details

See drawing below.

Materials of Construction*



Guide Rod

Stainless steel.


Stainless steel.

Tie Plate

Stainless steel.

Guide & Bearing Pin

Stainless steel.




Nitrile Ebonite.

Drive Magnet

Nylon 12 composite.

Standard Dial

Copolymer, hermetically sealed, gasoline resistant.

When Ordering Specify:

1. Gauge model number.

2. Tank depth.

3. Riser height if any.

*Materials and specifications are subject to change without notice. Pressure ratings subject to change due to temperature and other environmental considerations.