Metric Class 4 Nuts | McMaster-Carr

Filter by

Pipe Size

Thread Type

System of Measurement

Fitting Type

Material

Pipe Schedule

Pipe Material

Pressure Class

For Flange Class

Fitting Connection

Finish

Shape

RoHS Compliance

Connects To

Flange Material

REACH Compliance

DFARS Compliance

For Conduit Material

Certification

Specifications Met

Gender

Length

For Use With

Forward

How can we improve?

6 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

About Conduit

Low-Pressure Stainless Steel Threaded Pipe Fittings

Use these fittings in a low-pressure pipe line.

Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking. 304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.

Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.

NPTF (Dryseal) threads and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.

For technical drawings and 3-D models, click on a part number.

Locknuts

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class:
NPSL: 150
Fabrication:
NPSL: Heat Treated
Specifications Met:
NPSL: ANSI/MSS SP-114, ASTM A351
BSPP: DIN 431
Pipe Nipples and Pipe:
NPSL: Use Schedule 40 stainless steel
Flanges:
NPSL: Use Class 150 stainless steel

			304 Stainless Steel		316 Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure		Each		Each
NPSL Female
4	300 psi @ 72° F	150 psi @ 350° F	00000000	000000	00000000	000000

Locknuts for Metal Conduit Fittings

Zinc-Plated Steel,
316 Stainless
Steel, and Aluminum

Zinc-Plated Steel with PVC Molded Gasket

Zinc-Plated
Steel with
Serrated Facing

Secure threaded metal conduit fittings to a knockout in an outlet box or enclosure.

Zinc-plated steel, 316 stainless steel, and aluminum locknuts are compatible with NPSL and NPSM threads.

Locknuts with a PVC molded gasket create a seal for moisture protection.

Locknuts with serrated facing grip the material surface for more stability, compared to locknuts with smooth facing.

For technical drawings and 3-D models, click on a part number.

Zinc-Plated Steel
Pipe Size	Specifications Met		Each
NPSM Threads
4	CSA Certified	00000000	00000
Zinc-Plated Steel with PVC Molded Gasket
NPSM Threads
4	CSA Certified	00000000	00000
Zinc-Plated Steel with Serrated Facing
NPSM Threads
4	CSA Certified	00000000	00000
316 Stainless Steel
NPSL
4	UL Listed, C-UL Listed	00000000	00000