M18 Screws | McMaster-Carr

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	System of Measurement System of Measurement

Metric

	Thread Size Thread Size	Show

M18

	Thread Size Thread Size	Hide

	Thread Pitch Thread Pitch

1.5 mm

2.5 mm

	Length Length

	Head Type Head Type


Socket	Hex

Flat	Headless

	Threading Threading

	Fully Threaded
	Partially Threaded

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Material Material

Stainless Steel

Steel

	Finish Finish

Zinc Yellow-Chromate Plated

	Thread Spacing Thread Spacing

Coarse

Fine

	Drive Style Drive Style


Hex	External Hex

	Thread Type Thread Type

Metric

	Head Height Head Height

	Head Width Head Width

27 mm

	Thread Direction Thread Direction

	Right Hand

	Thread Fit Thread Fit

Class 5g6g

Class 6g

Class 6h

	Hardness Hardness

	Specifications Met Specifications Met

ASTM

DIN

ISO

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

REACH Compliant

	Tensile Strength Tensile Strength

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Head Diameter Head Diameter

27 mm

33mm

	Minimum Thread Length Minimum Thread Length

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About Hex Head Screws and Bolts

Alloy Steel Socket Head Screws

The standard for high-strength fastening.

18-8 Stainless Steel Socket Head Screws

Use these general purpose 18-8 stainless steel screws for a variety of fastening applications. They have good chemical resistance.

High-Strength Metric Class 10.9 Steel Hex Head Screws

Choose these metric screws for high-strength fastening. Often used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems, these screws are at least 25% stronger than medium-strength steel screws.

Medium-Strength Metric Class
8.8 Steel Hex Head Screws

Choose these metric screws for fastening most machinery and equipment. They are twice as strong as low-strength steel screws.

18-8 Stainless Steel Hex Head Screws

Use these general purpose 18-8 stainless steel screws for a variety of fastening applications. They have good chemical resistance.

Super-Corrosion-Resistant 316
Stainless Steel Hex Head Screws

More corrosion resistant than 18-8 stainless steel screws, these 316 stainless steel screws have excellent resistance to chemicals and salt water.

Metric Alloy Steel Hex Drive Flat Head Screws

Metric Alloy Steel Cup-Point Set Screws

These alloy steel set screws have a thin edge that digs into hard surfaces for a secure hold. They're available in metric sizes.

Threaded Rods

Metric Medium-Strength Steel
Threaded Rods—Grade B7

These metric Grade B7 threaded rods meet the pressure and temperature requirements of ASTM A193 and are often used to secure pressure tanks, valves, and flanges.

Metric Fine-Thread Medium-Strength
Steel Threaded Rods—Grade B7

These metric Grade B7 fine-threaded rods meet the pressure and temperature requirements of ASTM A193 and are often used to secure pressure tanks, valves, and flanges.

Medium-Strength Steel Threaded Rods—Class 8.8

An economical alternative to Grade B7 and Grade B16 threaded rods, these metric Class 8.8 rods are suitable for fastening most machinery and equipment.

Metric Fine-Thread Low-Strength Steel Threaded Rods

About half the strength of medium-strength steel threaded rods, use these metric fine-thread rods for light duty hanging, mounting, and fastening.

Metric Low-Strength Steel Threaded Rods

These metric threaded rods are about half the strength of medium-strength steel threaded rods for light duty hanging, mounting, and fastening.

Metric High-Strength Steel Threaded Rods—Class 10.9

These Class 10.9 steel threaded rods are about 25% stronger than medium-strength steel rods.

Metric 18-8 Stainless Steel Threaded Rods

Available in metric sizes, these 18-8 stainless steel threaded rods have good chemical resistance.

Eyebolts—For Lifting

Also known as machinery eyebolts.

Eyebolts with Nuts—For Lifting

Also known as nut eyebolts, these are designed for through-hole applications.

Rotating Eyebolts—For Lifting

Unlike conventional eyebolts, you can rotate the eye 360° to match the angle of your load.

Nylon-Coated Eyebolts—For Lifting

Route wire and cable through the smooth eye without snagging.

Eye Nuts—For Lifting

Create your own lifting eye by adding an eye nut to a stud or bolt.

About Hex Head Screws and Bolts

Screws and Bolts

Alloy Steel Socket Head Screws

18-8 Stainless Steel Socket Head Screws

High-Strength Metric Class 10.9 Steel Hex Head Screws

Medium-Strength Metric Class8.8 Steel Hex Head Screws

18-8 Stainless Steel Hex Head Screws

Super-Corrosion-Resistant 316Stainless Steel Hex Head Screws

Metric Alloy Steel Hex Drive Flat Head Screws

Metric Alloy Steel Cup-Point Set Screws

Threaded Rods

Metric Medium-Strength SteelThreaded Rods—Grade B7

Metric Fine-Thread Medium-StrengthSteel Threaded Rods—Grade B7

Medium-Strength Steel Threaded Rods—Class 8.8

Metric Fine-Thread Low-Strength Steel Threaded Rods

Metric Low-Strength Steel Threaded Rods

Metric High-Strength Steel Threaded Rods—Class 10.9

Metric 18-8 Stainless Steel Threaded Rods

Eyebolts—For Lifting

Eyebolts—For Lifting

Eyebolts with Nuts—For Lifting

Rotating Eyebolts—For Lifting

Nylon-Coated Eyebolts—For Lifting

Eye Nuts—For Lifting

Medium-Strength Metric Class
8.8 Steel Hex Head Screws

Super-Corrosion-Resistant 316
Stainless Steel Hex Head Screws

Metric Medium-Strength Steel
Threaded Rods—Grade B7

Metric Fine-Thread Medium-Strength
Steel Threaded Rods—Grade B7