6-40 Fasteners | McMaster-Carr

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	System of Measurement System of Measurement

	Thread Size Thread Size	Show

	Thread Size Thread Size	Hide

	Thread Type Thread Type

	Length Length

	Head Type Head Type


Socket	Rounded

Flat	Headless

	Material Material

Stainless
Steel

	Finish Finish

	Drive Style Drive Style


Hex	External Hex	Phillips

	Threading Threading

	Fully Threaded
	Partially Threaded

	Head Diameter Head Diameter

	Thread Spacing Thread Spacing

	Thread Fit Thread Fit

	Thread Direction Thread Direction

	Right Hand

	Head Height Head Height

	Specifications Met Specifications Met

Fed. Spec.

Mil. Spec.

NAS

	Hardness Hardness

	Tensile Strength Tensile Strength

	Drive Size Drive Size

	Socket Head Profile Socket Head Profile

	Standard

	Rounded Head Style Rounded Head Style


Button	Pan

	Flat Head Profile Flat Head Profile

	Standard

	Nut Type Nut Type


Cap	Hex

Locknut

	Hex Length Hex Length

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122 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.

Rounded Head Screws

testString

A domed head sits above the surface of your material. Includes screws such as pan, button, binding, and truss head screws.

Flat Head Screws

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

Set Screws

testString

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

Other Fasteners

Nuts

testString

Helical Inserts for Metal

Wound like springs, the coil of these inserts expands once installed to securely anchor the insert.

Thread Adapters

Thread Adapters

Adapters connect two female threads, two male threads, or a male thread and a female thread.

Extension Spring Stud Anchors

Attach an extension spring to a stud and then thread the stud into your part for a secure connection.

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