Flat Head Undercut Machine Screws

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Standard	Undercut

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

0-80
1-64
1-72
2-56
2-64
3-48
4-40
4-48
5-40
6-32
8-32
10-24
10-32
12-24
1/4"-20
1/4"-28
5/16"-18
3/8"-16
1/2"-13
M2
M2.5
M3
M4
M5
M6
M8
M10
M12

	Head Type Head Type

	Flat

	Length Length

	Material Material

	Finish Finish

	Drive Style Drive Style


Drilled Spanner	Hex	Phillips

Slotted	Tamper- Resistant Hex	Tamper- Resistant Torx

Tamper- Resistant Torx Plus	Torx

	Countersink Angle Countersink Angle

82°

90°

100°

	Head Height Head Height

	Head Diameter Head Diameter

	Threading Threading

	Fully Threaded
	Partially Threaded

	Specifications Met Specifications Met

	Size Size

	Thread Direction Thread Direction

	Right Hand

	Thread Type Thread Type

UNC

Metric

UNF

	Thread Spacing Thread Spacing

Coarse

Fine

	Tensile Strength Tensile Strength

40,000 to 59,999 psi

60,000 to 99,999 psi

100,000 psi or greater

Not Rated

	Thread Fit Thread Fit

Class 2A

Class 3A

Class 6g

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

RoHS Compliant

	Hardness Hardness

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

REACH Compliant

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

DFARS Specialty Metals
Compliant

DFARS Specialty Metals
COTS-Exempt

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About Flat Head Screws

Mil. Spec. Stainless Steel Phillips Flat Head Screws

Choose these screws for their adherence to strict military standards for material and construction.

18-8 Stainless Steel Phillips Flat Head Screws

These screws have good chemical resistance and may be mildly magnetic.

316 Stainless Steel Phillips Flat Head Screws

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

Steel Phillips Flat Head Screws

These steel screws have a zinc plating for mild corrosion resistance.

Mil. Spec. Steel Phillips Flat Head Screws

Choose these screws for their adherence to strict military standards for material and construction.

Brass Phillips Flat Head Screws

Brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Aluminum Phillips Flat Head Screws

Aluminum screws are lightweight and have good corrosion resistance.

Hex Drive Flat Head Screws

18-8 Stainless Steel Hex Drive Flat Head Screws

These 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic.

316 Stainless Steel Hex Drive Flat Head Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Metric 316 Stainless Steel Hex Drive Flat Head Screws

More corrosion resistant than 18-8 stainless steel screws, these metric screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Alloy Steel Hex Drive Flat Head Screws

Slotted Flat Head Screws

18-8 Stainless Steel Slotted Flat Head Screws

These 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic.

316 Stainless Steel Slotted Flat Head Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Brass Slotted Flat Head Screws

Brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Steel Slotted Flat Head Screws

A zinc plating provides mild corrosion resistance.

Nylon Slotted Flat Head Screws

These screws are chemical and oil resistant, nonconductive, and lightweight. Exposure to moisture may cause them to expand.

Aluminum Slotted Flat Head Screws

Aluminum screws are lightweight and have good corrosion resistance.

Steel Torx Flat Head Screws

Lower strength than alloy steel, use these screws for light duty fastening.

Tamper-Resistant Flat Head Screws

Tamper-Resistant Torx Flat Head Screws

With a tamper-resistant Torx or Torx Plus drive (also known as a pin-in Torx or Torx Plus drive), these screws are difficult to remove without special tools.

Metric Sealing Tamper-Resistant Torx Flat Head Screws

With an O-ring under the head, these metric screws seal out leaks and contaminants while also preventing unwanted removal.

Sealing Tamper-Resistant Torx Flat Head Screws

Prevent unwanted removal, leaks, and contamination with these sealing Torx screws.

Tamper-Resistant Drilled Spanner Flat Head Screws

These screws have a tamper-resistant drilled spanner drive, which makes them difficult to remove without special tools.

Tamper-Resistant Hex Drive Flat Head Screws

A tamper-resistant hex drive (also known as pin-in hex drive) makes these screws difficult to remove without special tools.

Sealing Flat Head Screws

Metric Sealing Flat Head Screws

To prevent leaks and seal out contaminants, these metric screws have an O-ring under the head.

Sealing Flat Head Screws

With an O-ring under the head, these screws prevent leaks and seal out contaminants.

Tapping Screws for Metal

Steel Phillips Flat Head Thread-Cutting Screws for Metal

These steel screws cut threads in drilled holes as they’re turned, so they require less driving torque and cause less stress on your material than thread forming screws.

Stainless Steel Phillips Flat Head
Thread-Cutting Screws for Metal

Made from 410 stainless steel, these screws are strong, wear resistant, and mildly chemical resistant.

Hinge Screws

Commonly used with door hinge hardware, these screws cut threads in material such as aluminum and brass.

Steel Flat Head Blunt Screws for Sheet Metal

These steel screws are zinc plated to resist corrosion in wet environments.

Stainless Steel Flat Head Blunt Screws for Sheet Metal

Made from 18-8 stainless steel, these screws are chemical resistant.

About Flat Head Screws

Phillips Flat Head Screws

Mil. Spec. Stainless Steel Phillips Flat Head Screws

18-8 Stainless Steel Phillips Flat Head Screws

316 Stainless Steel Phillips Flat Head Screws

Steel Phillips Flat Head Screws

Mil. Spec. Steel Phillips Flat Head Screws

Brass Phillips Flat Head Screws

Aluminum Phillips Flat Head Screws

Hex Drive Flat Head Screws

18-8 Stainless Steel Hex Drive Flat Head Screws

316 Stainless Steel Hex Drive Flat Head Screws

Metric 316 Stainless Steel Hex Drive Flat Head Screws

Alloy Steel Hex Drive Flat Head Screws

Slotted Flat Head Screws

18-8 Stainless Steel Slotted Flat Head Screws

316 Stainless Steel Slotted Flat Head Screws

Brass Slotted Flat Head Screws

Steel Slotted Flat Head Screws

Nylon Slotted Flat Head Screws

Aluminum Slotted Flat Head Screws

Steel Torx Flat Head Screws

Steel Torx Flat Head Screws

Tamper-Resistant Flat Head Screws

Tamper-Resistant Torx Flat Head Screws

Metric Sealing Tamper-Resistant Torx Flat Head Screws

Sealing Tamper-Resistant Torx Flat Head Screws

Tamper-Resistant Drilled Spanner Flat Head Screws

Tamper-Resistant Hex Drive Flat Head Screws

Sealing Flat Head Screws

Metric Sealing Flat Head Screws

Sealing Flat Head Screws

Tapping Screws for Metal

Steel Phillips Flat Head Thread-Cutting Screws for Metal

Stainless Steel Phillips Flat HeadThread-Cutting Screws for Metal

Hinge Screws

Steel Flat Head Blunt Screws for Sheet Metal

Stainless Steel Flat Head Blunt Screws for Sheet Metal

Stainless Steel Phillips Flat Head
Thread-Cutting Screws for Metal