4-40 Spacers | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size	Show

4-40

	Thread Size Thread Size	Hide

	Length Length

	Material Material

	Hex Size Hex Size

	Shape Shape


Round	Hex

	Gender Gender


Female	Male

	Threading Threading

	Fully Threaded
	Partially Threaded

	Thread Length Thread Length

	OD OD

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Hardness Hardness

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Tensile Strength Tensile Strength

	Specifications Met Specifications Met

ASTM

NAS

SAE

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

REACH Compliant

	Thread Fit Thread Fit

	Finish Finish

Black Oxide

Passivated

Yellow-Chromate Plated

Zinc Plated

Zinc Yellow-Chromate Plated

	PEM® Part Number PEM® Part Number

	Color Color

	Black
	Off-White

	Hex Length Hex Length

	For Hole Diameter For Hole Diameter

0.166"

0.188"

	Mount Type Mount Type

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1,008 Products

Spacers and Standoffs

Male-Female Threaded Hex Standoffs

NAS Male-Female Threaded Hex Standoffs

These standoffs are made to NAS specifications.

Female Threaded Hex Standoffs

NAS Female Threaded Hex Standoffs

Choose these standoffs for their adherence to NAS 1831 specifications.

Female Threaded Round Standoffs

Male Threaded Standoffs

Hinged Male-Female Threaded Round Standoffs

Hinged Male Threaded Round Standoffs

Hinged Female Threaded Round Standoffs

Jack Screws

Secure computer cables and panels.

Press-Fit Threaded Standoffs with Open End

Press-Fit Threaded Standoffs with Closed End

Splined Press-Fit Threaded Standoffs with Open End

Crimp-On Female Threaded Round Standoffs

Often called swage standoffs because you permanently crimp them into a panel.

Thread Adapters

Inch-to-Inch Male-Female Hex Thread Adapters

Change thread sizes or types, such as fine to coarse threads, on parts without changing gender.

Inch-to-Metric Male-Female Hex Thread Adapters

Change inch threads to metric with these adapters, or swap metric threads for inch. An external hex lets you tighten or loosen them with a wrench.

Inch-to-Inch Male Hex Thread Adapters

Need to join two female-threaded parts, such as coupling nuts, with dissimilar inch thread sizes? Attach them to these adapters and tighten the exterior hex nut for a secure connection.

Inch-to-Metric Male Hex Thread Adapters

One side inch, one side metric, and a hex in the middle—these handy fasteners connect two female-threaded parts, such as coupling nuts, adapting from inch threads to metric. Tighten with a standard wrench.

Inch-to-Inch Female Hex Thread Adapters

Connect two differently sized male-threaded parts, such as threaded rods, and tighten with a standard wrench.

Inch-to-Metric Female Hex Thread Adapters

Adapt threaded rods from inch to metric. These adapters connect two male-threaded fasteners, so you can change the gender of a mating part or increase or decrease its thread size. The hex-shaped body fits into the head of a standard wrench.

Left-Hand to Right-Hand Female Hex Thread Adapters

Often called sleeve nuts, these thread adapters fasten parts with right-hand threads to parts with left-hand threads.

Bumpers

Load-Rated Threaded-Stud Bumpers

Select these bumpers for applications that require specific load capacities. All are reinforced with a base plate for strength. Often used as feet, spacers, and vibration dampers, they absorb shock to prevent damage to equipment and surfaces. They're also good for starting and stopping motion on automated machines and conveyors. Twist these bumpers into a threaded hole.

Load-Rated Threaded Bumpers