Inch Sight Glass | McMaster-Carr

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	For Use With For Use With

Acetic Acid

Air

Alcohol-Based Solvents

	System of Measurement System of Measurement	Show

Inch

	System of Measurement System of Measurement	Hide

Inch

Metric

	Connection Center-to-Center Connection Center-to-Center

	Material Material

Aluminum

Brass

Bronze

Corning® Willow® Glass

	OD OD

	Maximum Temperature Maximum Temperature

	Length Length

	Diameter Diameter

	Shape Shape

	Window Diameter Window Diameter

	Thread Type Thread Type

NPT

NPTF

UNF

	Maximum Pressure Maximum Pressure

	Connection Style Connection Style

	Window Material Window Material

Glass

Plastic

	Minimum Temperature Minimum Temperature

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Thread Size Thread Size

	Pipe Size Pipe Size

	Mount Type Mount Type

	For Tube OD For Tube OD

	Color Color

	Clear		Black
	Gray		White
	Amber

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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720 Products

Sights

High-Visibility Sights

Easily view liquid movement and level changes from a distance—these sights have an indicator ball inside the glass window.

Weld-On Sights

Weld these sights to single-wall tanks.

Through-Wall Sights

Mount these sights from the inside of your tank and secure with a lock nut.

Press-Fit Through-Wall Sights

Press these sights into a hole in your tank wall; no additional mounting nuts are needed. They mount from the outside.

Sights for Quick-Clamp Sanitary Tube Fittings

Monitor food, brewery, chemical, pharmaceutical, and biotech processing lines with these sights that attach to quick-clamp fittings for fast installation and easy removal for cleaning.

High-Vacuum Flanged Sights

Add a window to your high-vacuum system. With a pane of borosilicate glass sealed inside a high-vacuum CF flange, these sights bolt onto vacuum chambers, tee fittings, and manifolds.

High-Vacuum Sights for Quick-Clamp Fittings

Designed with quick-clamp (KF) connections, these sights connect to a port on a high-vacuum chamber, so you can monitor what's happening inside.

Liquid-Level Indicators

High-Pressure Oil-Level Indicators

Monitor hydraulic fluid or oil level in pressurized applications.

Shatter-Resistant Oil-Level Indicators

The nylon body and window make these indicators shatter resistant.

Water-Level Indicators

These flexible indicators bend to follow the contours of a tank.

Tubular Gauge Glass

Replace existing gauge glass or combine with valves and guard rods to build your own level indicator.

Gauge Glass for Heavy-Duty Level Indicators

Use this gauge glass with heavy duty level indicators.

Build-Your-Own Level Indicators with Shut-Off Valve

Combine a pair of valves with a gauge glass and four guard rods to build a complete level indicator.

High-Pressure Oil-Level and Temperature Indicators

These indicators mount from the outside of your tank.

Through-Wall High-Pressure
Oil-Level and Temperature Indicators

Mount these indicators from the inside of your tank through unthreaded holes.

Shatter-Resistant Oil-Level and Temperature Indicators

The nylon body and window make these indicators shatter resistant.

Gaskets for Tubular Gauge Glass

Seal the glass on your level indicator.

Gaskets for Heavy-Duty Level Indicators

Use these gaskets with heavy duty level indicators to seal the glass.

Flow Sights

Full-View Flow Sights for Water and Oil

A large tubular window provides an unobstructed view of liquid color, clarity, and movement from multiple angles.

Full-View Flow Sights with Indicator for Water and Oil

A ball indicator increases the visibility of flow for checking at a distance.

Flow Sights with Indicator for Water and Oil

The indicator moves when flow is present, so it’s easy to visually confirm flow from a distance.

Flow Sights for Water and Oil

Often used in cooling, lubrication, and process systems.

High-Temperature Flow Sights for Water and Oil

Withstand twice the temperature of standard sights. These are rated for temperatures up to 400° F.

High-Pressure Flow Sights for Water and Oil

Rated for more than double the pressure of standard flow sights, these can withstand pressures up to 400 psi.

Flow Sights with Barbed Fittings
for Water, Oil, Air, and Inert Gas

Barbed fittings slide into soft plastic and rubber tubing.

Panel-Mount Flow Sights for Water, Oil, and Inert Gas

The included mounting ring lets you install these sights in instrument panels.

Flow Sights for Food and Beverage

Made of FDA-listed materials, these sights can be used with food and beverage. They have sanitary quick-clamp connections for easy disassembly and cleaning.

Compact Flow Sights for Chemicals

About half the height of other flow sights for chemicals, these fit in areas with limited clearance.

Flow Sights for Chemicals

Built to withstand harsh chemicals.

Clear Glass, Mica, and Ceramic

Borosilicate Glass Rods and Discs

Also called Pyrex and Schott glass, these glass rods and discs resist clouding and pitting and are highly chemical and heat resistant.

Pressure-Rated Borosilicate Glass Discs

Commonly used as sight glass.

Borosilicate Glass Tubes

Also called Pyrex and Schott glass, these glass tubes resist clouding and pitting and are highly chemical and heat resistant.

Pressure-Rated Borosilicate Glass Tubes

These short glass tubes can be used as glass bowls in oil dispensers.

Borosilicate Glass Sheets

Also known as Pyrex and Schott glass, borosilicate sheets are heat resistant, clear, and have a super-smooth surface. They're used in a range of applications, from high-temperature viewports to 3D printing.

Borosilicate Glass Balls

Also called Pyrex and Schott glass, these glass balls resist clouding and pitting and are highly chemical and heat resistant.

Ultra-High-Temperature Quartz Glass Rods and Discs

Able to withstand temperatures up to 2100° F, this quartz glass is useful in high-temperature applications that also require optical clarity, such as high-intensity lighting, fiber-optic production, and optical lens systems.

Ultra-High-Temperature Quartz Glass Tubes

Blistering temperatures won’t melt these quartz tubes, and rapid temperature shifts won’t cause them to crack.

Ultra-High-Temperature Quartz Glass Sheets

These sheets won't deform when exposed to temperatures up to 2100° F or from drastic temperature changes.

Clear Very High-Temperature Glass Ceramic

Combining the transparency of glass with the high heat resistance of ceramic, glass ceramic withstands temperatures up to 1255° F and resists rapid temperature changes.

Wire-Reinforced Glass

Wire reinforcement and an acrylic coating increase this glass's impact resistance. It's often used in doors.

Tough Corning® Gorilla® Glass

Very thin yet extremely durable, this glass has been chemically strengthened to maximize toughness and scratch resistance. It's often used for mobile device screens.

Super-Flexible Corning® Willow® Glass

This glass bends like plastic but is eight times harder—it’s harder than tooth enamel but softer than quartz.

Sights

High-Visibility Sights

Weld-On Sights

Through-Wall Sights

Press-Fit Through-Wall Sights

Sights for Quick-Clamp Sanitary Tube Fittings

High-Vacuum Flanged Sights

High-Vacuum Sights for Quick-Clamp Fittings

Liquid-Level Indicators

High-Pressure Oil-Level Indicators

Shatter-Resistant Oil-Level Indicators

Water-Level Indicators

Tubular Gauge Glass

Gauge Glass for Heavy-Duty Level Indicators

Build-Your-Own Level Indicators with Shut-Off Valve

High-Pressure Oil-Level and Temperature Indicators

Through-Wall High-PressureOil-Level and Temperature Indicators

Shatter-Resistant Oil-Level and Temperature Indicators

Gaskets for Tubular Gauge Glass

Gaskets for Heavy-Duty Level Indicators

Flow Sights

Full-View Flow Sights for Water and Oil

Full-View Flow Sights with Indicator for Water and Oil

Flow Sights with Indicator for Water and Oil

Flow Sights for Water and Oil

High-Temperature Flow Sights for Water and Oil

High-Pressure Flow Sights for Water and Oil

Flow Sights with Barbed Fittingsfor Water, Oil, Air, and Inert Gas

Panel-Mount Flow Sights for Water, Oil, and Inert Gas

Flow Sights for Food and Beverage

Compact Flow Sights for Chemicals

Flow Sights for Chemicals

Clear Glass, Mica, and Ceramic

Borosilicate Glass Rods and Discs

Pressure-Rated Borosilicate Glass Discs

Borosilicate Glass Tubes

Pressure-Rated Borosilicate Glass Tubes

Borosilicate Glass Sheets

Borosilicate Glass Balls

Ultra-High-Temperature Quartz Glass Rods and Discs

Ultra-High-Temperature Quartz Glass Tubes

Ultra-High-Temperature Quartz Glass Sheets

Clear Very High-Temperature Glass Ceramic

Wire-Reinforced Glass

Tough Corning® Gorilla® Glass

Super-Flexible Corning® Willow® Glass

Through-Wall High-Pressure
Oil-Level and Temperature Indicators

Flow Sights with Barbed Fittings
for Water, Oil, Air, and Inert Gas