M20 Screws | McMaster-Carr

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	System of Measurement System of Measurement

	Thread Size Thread Size	Show

	Thread Size Thread Size	Hide

	Thread Pitch Thread Pitch

	Length Length

	Head Type Head Type


Socket	Rounded

Hex	Flat

Headless	Square

	Threading Threading

Partially Threaded

Threaded on Both Ends

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Material Material

Stainless
Steel

	Finish Finish

Black Zinc Plated

Hot-Dipped Galvanized

Zinc Yellow-Chromate Plated

	Drive Style Drive Style


Hex	External Hex

External Square	Hex with Pilot Recess

	Socket Head Profile Socket Head Profile


Standard	Low

	Head Width Head Width

	Head Height Head Height

	Thread Spacing Thread Spacing

	Thread Direction Thread Direction

Right Hand and Left Hand

	Specifications Met Specifications Met

ASTM

DIN

ISO

	Thread Type Thread Type

Metric Rounded Acme

	Tensile Strength Tensile Strength

	Hardness Hardness

	Thread Fit Thread Fit

	Head Diameter Head Diameter

	Drive Size Drive Size

	Minimum Thread Length Minimum Thread Length

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598 Products

Screws and Bolts

Socket Head Screws

With a deeper drive than flat and rounded head screws, socket head screws withstand more torque for a tighter hold. Install in a counterbored hole or above the surface.

Hex Head Screws

Hex head screws are easy to install with a wrench for a secure hold. Use them with a nut or in tapped holes.

Flat Head Screws

Flat and oval head screws are angled under the head to fit in countersunk holes.

Shoulder Screws

A cylindrical shoulder under the head allows parts to rotate around and slide along its length, so these screws are often used to guide and align components.

Set Screws

testString

Unlike screws that hold materials together with threads, set screws exert pressure at the tip to hold objects in place.

Carriage Bolts

testString

Carriage bolts have a smooth, rounded head for a finished look. The neck shape keeps them from turning when tightening a nut.

Other Screws

Threaded Rods

Lead Screws and Screw Jacks

testString

T-Slot Fasteners and Setup Studs

Designed to fit into T-slot tracks on machine tool tables, use these nuts, bolts, and studs to secure clamps or workpieces.

Eyebolts—For Lifting

Connecting Rods

Build linkages for push/pull and oscillating movement by fastening rod ends, swivel joints, or ball joint linkages to the ends of these rods.

Center-Locating Punches
for Threaded Holes

Use the included handle to screw a punch into a hole.

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The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)