Obstruction Wrenches | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Size Size

	Material Material

	For OD For OD

	Wrench Style Wrench Style


Open End	Box

Combination	Socket

Spanner	Strap

	Retaining Ring Style Retaining Ring Style


Side Mount	Push On

Spiral

	Individual/Set Individual/Set

Individual

Set

	For Drive Style For Drive Style


External Hex	External 12-Point	External Square

	Square Drive Size Square Drive Size

1/4"

3/8"

1/2"

	Head Style Head Style


Standard	Flex

	Overall Length Overall Length

	Retaining Ring Type Retaining Ring Type

	External
	Internal

	Finish Finish

Corrosion-Resistant-Coated

Galvanized

Nickel Plated

Zinc Yellow-Chromate Plated

	For Groove Diameter For Groove Diameter

	Ring OD Ring OD

	Socket Style Socket Style


Offset	Flex

	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

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

REACH Compliant

	Ring Thickness Ring Thickness

	Head Thickness Head Thickness

	Ratcheting or Nonratcheting Ratcheting or Nonratcheting

Nonratcheting

Ratcheting

	Opening Shape Opening Shape


Rounded	12-Point

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857 Products

Socket Sets

Box-End Tight-Clearance Offset Socket Sets

Make maximum contact on all sides of a fastener to reduce slipping. These sockets are also known as torque adapters.

Ratcheting Box-End Tight-Clearance Offset Socket Sets

A ratchet mechanism allows you to turn fasteners without removing and repositioning the socket.

Secure-Grip Tight-Clearance Offset Socket Sets

The opening shape makes more contact with fasteners for a better grip than standard open-end sockets. Also known as flare-nut or line wrench sockets, they're often used with flared tube fittings and fuel and hydraulic lines.

Tight-Clearance Offset Socket Sets

Often used with an extension, these sockets turn fasteners and fittings in obstructed areas that a regular socket can't reach. They are also known as crowfoot wrenches.

12-Point Flex Socket Sets

Pivot the head to access fasteners from an angle.

6-Point Flex Impact Socket Sets

Pivot the head to access fasteners from an angle.

Sockets

Box-End Tight-Clearance Offset Sockets

Make maximum contact with all sides of a fastener to reduce slipping. These sockets are also known as torque adapters.

Ratcheting Box-End Tight-Clearance Offset Sockets

A ratchet mechanism allows you to turn fasteners without removing and repositioning the socket.

Tight-Clearance Offset Sockets

Often used with an extension, these sockets turn fasteners and fittings in obstructed areas that a regular socket can't reach. They are also known as crowfoot wrenches.

Secure-Grip Tight-Clearance Offset Sockets

12-Point Flex Sockets

Pivot the head to access fasteners from an angle.

Flex Spark Plug Sockets

Pivot the head to access fasteners from an angle.

6-Point Flex Sockets

Pivot the head to access fasteners from an angle.

12-Point Flex Impact Sockets

Pivot the head to access fasteners from an angle.

6-Point Flex Impact Sockets

Pivot the head to access fasteners from an angle.

Socket Retaining Rings

One-Piece Socket Retaining Rings

Two-Piece Socket Retaining Rings

Curved Box Wrenches

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

Open-End Wrenches

Tight-Clearance Open-End Wrenches

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

Two-Head Tight-Clearance Open-End Wrenches

These are also known as tappet wrenches.

75° Angle Tight-Clearance Open-End Wrenches

One head is angled for access to hard-to-reach fasteners. These are also known as ignition wrenches.

Tight-Clearance Open-End Wrench Sets

Fit the narrow head into tight spaces and around thin fasteners.

Two-Head Tight-Clearance Open-End Wrench Sets

The slim heads fit into tight spaces and around thin fasteners.

75° Angle Tight-Clearance Open-End Wrench Sets

One head is angled 75° for access to hard-to-reach fasteners. These are also known as ignition wrenches.

Combination Wrenches

Flex-Head Ratcheting Combination Wrench Sets

Pivot the box end for access to fasteners in tight spots.

Flex-Head Ratcheting Combination Wrenches

Pivot the box end for access to fasteners in tight spots.

Flex-Head Socket Wrenches

Pivot the socket end to access hard-to-reach fasteners.

Adjustable Wrenches

Adjustable-Length Flex-Head Adjustable Wrenches

Extend the handle for additional reach.

Wide-Opening Tight-Clearance Adjustable Wrenches

The jaws on these wrenches are shaped to turn slip nuts, jam nuts, and large hex nuts.

Flex-Head Adjustable Wrenches

Also known as a basin wrench, this tool has a pivoting head and spring-close jaws for working in tight spaces where it’s difficult to adjust a traditional wrench.

Tight-Clearance Adjustable Wrenches

Fit the thin head and long jaws into narrow spaces.

Tight-Clearance Adjustable Pin Spanner Wrenches for Holes on the Face

Tight-Clearance Adjustable Pin Spanner
Wrenches for Holes on the Face

The slim profile fits the flanges and nuts on the backing pads of portable sanders and grinders.

Flex-Head Strap Wrenches

Pivot the head to clear obstructions and turn filters and other cylindrical objects in hard-to-reach areas.

Tag Rings

Loop these rings onto tags.

Fasteners

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.

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.

Single-Turn Spiral Internal Retaining Rings

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

Side-Mount External Retaining Rings

Also known as E-style rings.

Single-Turn Spiral External Retaining Rings

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

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.

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.

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

Push-On Internal Retaining Rings

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

Socket Sets

Box-End Tight-Clearance Offset Socket Sets

Ratcheting Box-End Tight-Clearance Offset Socket Sets

Secure-Grip Tight-Clearance Offset Socket Sets

Tight-Clearance Offset Socket Sets

12-Point Flex Socket Sets

6-Point Flex Impact Socket Sets

Sockets

Box-End Tight-Clearance Offset Sockets

Ratcheting Box-End Tight-Clearance Offset Sockets

Tight-Clearance Offset Sockets

Secure-Grip Tight-Clearance Offset Sockets

12-Point Flex Sockets

Flex Spark Plug Sockets

6-Point Flex Sockets

12-Point Flex Impact Sockets

6-Point Flex Impact Sockets

Socket Retaining Rings

One-Piece Socket Retaining Rings