Half-Moon Wrenches | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	For OD For OD

	Material Material

Steel

Stainless Steel

Plastic

	Finish Finish

Black Phosphate

Zinc Yellow-Chromate Plated

Corrosion-Resistant-Coated

Brass Plated

Galvanized

	Retaining Ring Style Retaining Ring Style


Side Mount	Push On

Spiral

	Retaining Ring Type Retaining Ring Type

	External
	Internal

	For Groove Diameter For Groove Diameter

	Ring OD Ring OD

	Ring Thickness Ring Thickness

	For Groove Width For Groove Width

	For ID For ID

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

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

RoHS Compliant

	Size Size

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

REACH Compliant

	Magnetic Properties Magnetic Properties

Magnetic

May Be Mildly Magnetic

	Minimum Hardness Minimum Hardness

	Wrench Style Wrench Style

	Box
	Open End

	Thrust Load Capacity Thrust Load Capacity

Less than 1,000 lbs.

1,000 to 1,999 lbs.

2,000 to 9,999 lbs.

10,000 to 19,999 lbs.

20,000 lbs. or greater

	Height Height

	Length Length

	Passivation Passivation

Passivated

Not Passivated

	Ring ID Ring ID

335 Products

Fastening and Joining

Side-Mount External Retaining Rings

Also known as E-style rings.

Wide-Grip Side-Mount External Retaining Rings

Also known as poodle rings, these thick rings have "ears" that form a large retaining surface to withstand stronger forces than other side-mount retaining rings.

Push-On External Retaining Rings

No groove required—press these rings onto the end of a shaft for a firm grip.

Push-On Retaining Caps

Use these caps to hold components in place and protect shaft ends.

Rectangular Push-On External Retaining Rings

Also known as flat-style speed nuts, these have a large surface to distribute loads better than standard and flanged external push rings.

Single-Turn Spiral External Retaining Rings

Slide these rings into place with one twist—no tools required—for applications with high thrust loads.

Push-On Internal Retaining Rings

No groove required—these rings have teeth that firmly grip the bore.

Single-Turn Spiral Internal Retaining Rings

Slide these rings into place by hand with a single twist for applications with high thrust loads.

Rectangular Push Nuts

Also known as flat-style speed nuts, these have large sides, so they're easy to push over threads by hand.

Rectangular Push Nuts for Tapping Screws

Side-Mount External Retaining Ring Assortments

Also known as E-Style and C-style rings, slide these into the groove from the side of the shaft. They provide a wider shoulder than other external retaining rings for a larger retaining surface.

6-Point Flex Impact Sockets

Pivot the head to access fasteners from an angle.

Tight-Clearance Open-End Wrenches

The slim head fits into tight spaces and around thin fasteners.

Curved Box Wrenches

Also known as half-moon and obstruction wrenches, the shape lets you reach around obstacles and into machinery.

Tag Rings

Loop these rings onto tags.