1/8 Pipe Size Fittings | McMaster-Carr

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5,530 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Pipe and Fittings

Stainless Steel Threaded Pipe and Fittings

Low-Pressure Stainless Steel Threaded Pipe Fittings

For pressures up to 500 psi

173 products

Standard-Wall Stainless Steel Threaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

113 products

Precision Extreme-Pressure Stainless Steel Threaded Pipe Fittings

The tightest tolerances of our stainless steel fittings; also called instrumentation fittings

48 products

High-Pressure Stainless Steel Threaded Pipe Fittings

Strong enough for pressures up to 3,000 psi

67 products

Miniature Medium-Pressure Stainless Steel Threaded Pipe Fittings

Less than two inches to fit in medium-pressure lines with limited space

88 products

Extreme-Pressure Stainless Steel Threaded Pipe Fittings

Our strongest stainless steel threaded fittings withstand pressures as high as 15,000 psi

65 products

Medium-Pressure Stainless Steel Threaded Pipe Fittings

For pressures up to 1,000 psi

18 products

Thick-Wall Stainless Steel Threaded Pipe Nipples and Pipe

Pair with high-pressure fittings; also known as Schedule 80

46 products

Standard-Wall Stainless Steel Threaded Pipe Nipples and Pipe with Sealant

Male threads have sealant applied for extra leak protection in low-pressure lines

24 products

Low-Pressure Stainless Steel Threaded Pipe Fittings with Sealant

Male threads have sealant applied for extra leak protection in low-pressure lines

19 products

Premium Medium-Pressure Stainless Steel Threaded Pipe Fittings

Cast in the U.S. and include certificate with traceable lot number

1 product

Brass and Bronze Threaded Pipe and Fittings

High-Pressure Brass and Bronze Threaded Pipe Fittings

Strong enough for pressures up to 3,900 psi

218 products

Low-Pressure Brass and Bronze Threaded Pipe Fittings

For pressures up to 300 psi

107 products

High-Pressure Brass and Bronze Threaded Pipe Fittings with Sealant

Male threads have sealant applied for extra leak protection in high-pressure lines

21 products

High-Pressure Brass and Bronze Threaded Pipe Nipples and Pipe

Strong enough for pressures up to 2,170 psi

26 products

Standard-Wall Brass and Bronze Threaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

42 products

High-Pressure Brass and Bronze Threaded Pipe Fittings for Drinking Water

NSF/ANSI rated for drinking water systems up to 1,200 psi

28 products

Medium-Pressure Brass and Bronze Threaded Pipe Fittings

For pressures up to 700 psi

10 products

Precision High-Pressure Brass and Bronze Threaded Pipe Fittings

The tightest tolerances of our brass pipe fittings; also known as instrumentation fittings

33 products

Universal-Thread Medium-Pressure Brass and Bronze Threaded Pipe Fittings

Compatible with the most common thread types for when you're unsure which one you need

6 products

Miniature High-Pressure Brass and Bronze Threaded Pipe Fittings

No bigger than an inch to fit in high-pressure lines with limited space

10 products

Low-Pressure Brass and Bronze Threaded Pipe Fittings with Sealant

Male threads have sealant for extra leak protection in low-pressure lines

6 products

Easy-Install High-Pressure Brass and Bronze Threaded Pipe Fittings

Install and remove with a socket wrench or hex key

3 products

High-Pressure Brass and Bronze Threaded Pipe Nipples and Pipe for Drinking Water

NSF/ANSI rated for drinking water systems up to 1,000 psi

3 products

Standard-Wall Brass and Bronze Threaded Pipe Nipples and Pipe with Sealant

Threads have sealant applied for extra leak protection in low-pressure lines; known as Schedule 40

12 products

Thick-Wall Brass and Bronze Threaded Pipe Nipples and Pipe

Pair with high-pressure fittings; also known as Schedule 80

18 products

Miniature Low-Pressure Brass and Bronze Threaded Pipe Fittings

Less than an inch to fit in low-pressure lines with limited space

3 products

High-Pressure Brass and Bronze Threaded Pipe Nipples and Pipe with Sealant

Male threads have sealant applied for extra leak protection in high-pressure lines

3 products

Standard-Wall Brass and Bronze Threaded Pipe Nipples and Pipe for Drinking Water

NSF/ANSI rated for drinking water systems; also known as Schedule 40

11 products

Iron and Steel Threaded Pipe and Fittings

Low-Pressure Iron and Steel Threaded Pipe Fittings

For pressures up to 300 psi

49 products

Extreme-Pressure Iron and Steel Threaded Pipe Fittings

Our strongest iron and steel threaded fittings withstand pressures up to 7,500 psi

91 products

Standard-Wall Iron and Steel Threaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

48 products

High-Pressure Iron and Steel Threaded Pipe Fittings

Strong enough for pressures up to 6,000 psi

24 products

Thick-Wall Iron and Steel Threaded Pipe Nipples and Pipe

Pair with medium-pressure fittings; also known as Schedule 80

43 products

Low-Pressure Iron and Steel Threaded Pipe Fittings with Sealant

Male threads have sealant applied for extra leak protection in low-pressure lines

7 products

Medium-Pressure Iron and Steel Threaded Pipe Fittings

For pressures up to 2,000 psi

3 products

Standard-Wall Iron and Steel Threaded Pipe Nipples and Pipe with Sealant

Threads have sealant applied for extra leak protection in low-pressure lines; known as Schedule 40

6 products

Quick-Tighten Standard-Wall Iron and Steel Threaded Pipe Nipples and Pipe

Tighten both ends at the same time by turning with a wrench; also known as Schedule 40

2 products

Galvanized Iron and Steel Threaded Pipe and Fittings

Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

For pressures up to 300 psi

37 products

Precision Extreme-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

The tightest tolerances of our iron and steel fittings; also known as instrumentation fittings

21 products

Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings with Sealant

Male threads have sealant applied for extra leak protection in low-pressure lines

8 products

Medium-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

For pressures up to 2,000 psi

2 products

Standard-Wall Galvanized Iron and Steel Threaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

6 products

High-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

Strong enough for pressures up to 3,000 psi

12 products

Thick-Wall Galvanized Iron and Steel Threaded Pipe Nipples and Pipe

Pair with medium-pressure fittings; also known as Schedule 80

4 products

Aluminum Threaded Pipe and Fittings

Low-Pressure Aluminum Threaded Pipe Fittings

For pressures up to 250 psi

29 products

Miniature Low-Pressure Aluminum Threaded Pipe Fittings

Less than two inches to fit in low-pressure lines with limited space

27 products

Standard-Wall Aluminum Threaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

33 products

Medium-Pressure Aluminum Threaded Pipe Fittings

For pressures up to 1,000 psi

5 products

Plastic Pipe and Fittings

High-Temperature PTFE Pipe Fittings for Harsh Chemicals

Withstand the widest temperature range of our plastic pipe for chemicals; known as Schedule 80

11 products

Plastic Pipe Fittings for Oil

Won’t deteriorate when exposed to oil

28 products

Flame-Retardant PVDF Pipe Fittings for Food and Beverage

IEC rated for flame retardance, NSF/ANSI rated for drinking water, and FDA compliant

12 products

Standard-Wall Plastic Pipe Fittings for Water

The industry standard for low-pressure water lines; also known as Schedule 40

7 products

UV-Resistant Polypropylene Pipe Fittings for Chemicals

Withstand sunlight as well as acids, solvents, and other chemicals

6 products

Thick-Wall Plastic Pipe Fittings for Water

Withstand heavy duty applications, such as water processing; also known as Schedule 80

4 products

Plastic Pipe Fittings for Food and Beverage

Won't transfer tastes or odors to food or beverages

13 products

CPVC Pipe Fittings for Chemicals

Withstand salt solutions, acids, and other harsh substances

3 products

Plastic Pipe Fittings for Gasoline

Connect gasoline fuel lines to machines and equipment

6 products

Crack-Resistant PFA Pipe Fittings for Harsh Chemicals

Resist cracking in heavy duty chemical flow processes; also known as Schedule 80

9 products

High-Temperature PTFE Pipe Nipples and Pipe for Harsh Chemicals

Withstand the widest temperature range of our plastic pipe for chemicals; known as Schedule 80

8 products

Standard-Wall Plastic Pipe Nipples and Pipe for Water

The industry standard for low-pressure water lines; also known as Schedule 40

3 products

Stainless Steel Unthreaded Pipe and Fittings

Standard-Wall Stainless Steel Unthreaded Pipe Nipples and Pipe

Pair with low- and medium-pressure fittings; also known as Schedule 40

16 products

High-Pressure Stainless Steel Socket-Connect Pipe Fittings

Easier to weld than butt-weld fittings and withstand pressures up to 3,000 psi

13 products

Iron and Steel Unthreaded Pipe and Fittings

High-Pressure Iron and Steel Socket-Connect Pipe Fittings

Easier to weld than butt-weld fittings and withstand pressures up to 3,000 psi

11 products

Standard-Wall Iron and Steel Unthreaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

10 products

Thick-Wall Iron and Steel Unthreaded Pipe Nipples and Pipe

Pair with high-pressure fittings; also known as Schedule 80

3 products

Brass and Bronze Unthreaded Pipe and Fittings

Standard-Wall Brass and Bronze Unthreaded Pipe Nipples and Pipe

Braze to low-pressure pipe and fittings for a strong, leak-free connection; known as Schedule 40

3 products

Aluminum Unthreaded Pipe and Fittings

Standard-Wall Aluminum Unthreaded Pipe Nipples and Pipe

Pair with low- and medium-pressure fittings; also known as Schedule 40

8 products

Other Products

Tube Fittings

Make threaded, push to connect, barbed, and other types of connections between lengths of tube

1,770 products

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

328 products

Grease Fitting Adapters

Mate grease fittings when the sizes and thread types don't match

32 products

Thread Adapters

Join threads of a different type, size, and gender

3 products

Grease Fittings

Create an inlet on equipment and machinery for injecting lubricant; also known as Zerk fittings

62 products

Manifolds

Distribute air or fluid to multiple places from a single source; also called headers

164 products

Rotary Joints

Transfer air, water, oil, and steam from supply lines to continuously revolving drums and rollers

3 products

Air Valves

Fill tanks, tires, and other pressurized equipment

14 products

Pipe Locknuts

Thread onto the male end of a pipe fitting so it won't loosen from vibration

11 products

Air Chucks

Connect air hose to Schrader valves, which are common on tires and hydraulic systems

2 products

Orifice Valves

Restrict the flow of liquids and gases to precisely control rate and pressure

223 products

Breather Vents

Maintain even pressure and vacuum as temperatures change by allowing airflow in tanks and enclosures

8 products

Manual On-Off Valves

Start and stop flow through a line

221 products

Junction Blocks

Organize and separate multiple lines in a pipe system; air and fluid flow through the threaded holes

21 products

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

8 products

Grease Gun Tips

Attach to grease gun nozzles and direct a stream of lubricant into grease fittings on machinery

55 products

Pressure-Relief Valves

Protect equipment by opening at a set pressure and closing when the pressure drops; for repeated use

10 products

Hose Nozzle Swivels

Rotate to prevent hose from kinking, twisting, and wearing

4 products

Grease Gun Nozzles

Replace nozzles on grease guns

101 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

12 products

Solenoid On-Off Valves

A solenoid withstands rapid cycling for applications with frequent opening and closing

54 products

Drain Valves

Vent air or discharge liquids to remove excess fluid from your system

6 products

Grease Fitting Repair Tools

Remove and repair broken or clogged grease fittings and re-tap threaded holes

1 product

Grease Gun Tip Adapters

Quickly switch between standard, button-head, and flush-style grease fittings

1 product

Vacuum Fittings

Connect to vacuum cups and compressed air to create suction; also known as venturi devices

5 products

Grommets

Protect wire, cable, and cords from holes with sharp or rough edges

1 product

Protective Caps

Protect just about anything, including pipe, flanges, screws, and posts

4 products

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

6 products

Oil Fittings

Install in engine blocks and other machinery to pour in oil while keeping dust out

4 products

Air-Actuated On-Off Valves

Operate on compressed air to start and stop flow faster than motor-driven valves

68 products

Compressed Air Filter/Regulator/Lubricator Manifolds

Distribute compressed air to multiple locations from a single source

12 products