M8 Shoulder Bolts | McMaster-Carr

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	System of Measurement System of Measurement

Metric

	Shoulder Length Shoulder Length

	Shoulder Diameter Shoulder Diameter

	Thread Size Thread Size	Show

	Thread Size Thread Size	Hide

	Thread Pitch Thread Pitch

1.25 mm

	Material Material

Steel

Stainless Steel

Brass

	Thread Length Thread Length

	Head Type Head Type


Socket	Hex

Headless

	Socket Head Profile Socket Head Profile


Standard	Low

	Drive Style Drive Style


Hex	Slotted	External Hex

	Head Height Head Height

	Head Texture Head Texture


Knurled	Smooth

	Head Diameter Head Diameter

	Shoulder Fit Shoulder Fit

Standard

Precise

	Finish Finish

	Minimum Shear Strength Minimum Shear Strength

	Size Size

4 mm

5 mm

6 mm

	Tensile Strength Tensile Strength

	Thread Direction Thread Direction

	Right Hand

	Hardness Hardness

	Thread Type Thread Type

Metric

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

RoHS Compliant

RoHS Compliant with
Exemptions

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

REACH Compliant

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317 Products

About Shoulder Screws

Metric Alloy Steel Shoulder Screws

Comparable to Class 12.9 steel.

Short-Thread Alloy Steel Shoulder Screws

Use these screws in thin materials; they have a shorter threaded portion than our standard shoulder screws. They’re comparable in strength to Grade 8 steel.

Metric Same-Size Thread Alloy Steel Shoulder Screws

The metric-sized threads on these screws are the same diameter as the shoulder. Comparable in strength to Class 12.9 steel.

Metric 18-8 Stainless Steel Shoulder Screws

These screws have metric thread sizes. They are 18-8 stainless steel for good chemical resistance.

Same-Size Thread 18-8
Stainless Steel Shoulder Screws

With inch-sized threads the same diameter as the shoulder, these screws can handle heavy loads. They’re 18-8 stainless steel for good chemical resistance.

Metric 316 Stainless Steel Shoulder Screws

For metric thread sizes with excellent resistance to chemicals and salt water, choose these 316 stainless steel shoulder screws.

Metric Slotted Low-Profile Steel Shoulder Screws

With a reduced head size and an unthreaded shoulder, use these screws as a shaft or dowel pin for small rotating parts in low-clearance applications.

Metric Low-Profile Shoulder Screws

These metric screws have a head height that's about two-thirds the head height of a standard shoulder screw. Use them in low-clearance applications such as inside machines.

Metric Steel Hex Head Shoulder Screws

Also known as wheel and axle bolts, these metric screws have an unthreaded shoulder that acts as a shaft, so material attached to the threaded end can rotate.

Metric Alloy Steel Thread-Locking Shoulder Screws

Available in metric sizes, these screws have a locking element on the threads that adds friction to resist loosening. Comparable to Grade 8 steel, they are the strongest screws we offer.

Precision Shoulder Screws

Metric 18-8 Stainless Steel Precision Shoulder Screws

Metric Slotted 18-8 Stainless
Steel Precision Shoulder Screws

With a shoulder that’s twice as precise as standard shoulder screws, these metric shoulder screws act as a shaft or axle for bearings and other moving parts in applications that require smooth and accurate movement, such as measuring and lab equipment. Made of 18-8 stainless steel, they’re nearly as strong as steel but won’t rust in outdoor or washdown environments.

Metric 316 Stainless Steel Precision Shoulder Screws

These metric 316 stainless steel shoulder screws are more corrosion resistant than 18-8 stainless steel shoulder screws. They also have excellent resistance to chemicals and salt water.

Headless Alloy Steel Precision Shoulder Screws

Without a head to get in the way, these screws fit in tight spaces where standard shoulder screws cannot. Either thread them in a countersunk hole for a flush mount, or install them with the shoulder sticking out to use them as pins or dowels for aligning and locating components.

Metric Brass Precision Shoulder Screws

Offered in metric sizes, these brass shoulder screws are electrically conductive, nonmagnetic, and have good corrosion resistance.