Flat Head Undercut Screws

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	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
5/8"-11
3/4"-10
M2
M2.5
M3
M4
M5
M6
M8

	Flat Head Profile Flat Head Profile


Undercut	Standard

	Length Length

	Material Material

	Drive Style Drive Style


Phillips	Hex	Slotted

Tamper- Resistant Torx	Drilled Spanner	Torx

Tamper- Resistant Hex	Tamper- Resistant Torx Plus

	Countersink Angle Countersink Angle

	Head Height Head Height

	Head Diameter Head Diameter

	Threading Threading

	Fully Threaded
	Partially Threaded

	Screw Size Screw Size

	Finish Finish

Ultra-Corrosion-Resistant
Coated

	Tip Type Tip Type


Pointed	Blunt

Drilling

	Drive Size Drive Size

	Thread Spacing Thread Spacing

Coarse

Fine

	Thread Type Thread Type

UNC

UNF

Metric

	Thread Pitch Thread Pitch

	Tensile Strength Tensile Strength

	Thread Fit Thread Fit

Class 2A

Class 3A

Class 6g

	Hardness Hardness

	Specifications Met Specifications Met

ASME

DIN

ASTM

Mil. Spec.

Fed. Spec.

ISO

SAE

NAS

	Tapping Screw Type Tapping Screw Type

	A/AB
	F
	B
	BSD

	For Use In For Use In

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About Flat Head Screws

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.

Mil. Spec. Stainless Steel
Phillips Flat Head Screws

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

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.

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.

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.

18-8 Stainless Steel Hex
Drive Flat Head Screws

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

Alloy Steel Hex Drive
Flat Head Screws

Brass Slotted Flat Head Screws

Brass screws are electrically conductive, nonmagnetic, and have good 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 Slotted Flat Head Screws

A zinc plating provides mild corrosion resistance.

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.

Steel Torx Flat Head Screws

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

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

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.

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 a pin-in hex drive) makes these screws difficult to remove without special tools.

Tapping Screws for Metal

18-8 Stainless Steel Phillips Flat
Head Screws for Sheet Metal

18-8 stainless steel screws have good chemical resistance.

Super-Corrosion-Resistant 316
Stainless Steel Phillips Flat
Head Screws for Sheet Metal

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

Steel Phillips Flat Head
Screws for Sheet Metal

These steel screws are available with corrosion-resistant finishes.

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.

Hinge Screws

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

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.

Metric Steel Flat Head
Drilling Screws for Metal

With a drilling tip, these metric screws cut their own pilot hole and threads as you fasten them into material.

Steel Flat Head Drilling
Screws for Metal

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

Flat Head Drilling
Screws for Aluminum

Beveled under the head for use in countersunk holes.

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About Flat Head Screws

Flat Head Screws

18-8 Stainless SteelPhillips Flat Head Screws

316 Stainless SteelPhillips Flat Head Screws

Mil. Spec. Stainless SteelPhillips Flat Head Screws

Steel Phillips Flat Head Screws

Mil. Spec. Steel PhillipsFlat Head Screws

Brass Phillips Flat Head Screws

Aluminum Phillips Flat Head Screws

Metric 316 Stainless SteelHex Drive Flat Head Screws

316 Stainless Steel HexDrive Flat Head Screws

18-8 Stainless Steel HexDrive Flat Head Screws

Alloy Steel Hex DriveFlat Head Screws

Brass Slotted Flat Head Screws

Nylon Slotted Flat Head Screws

Aluminum Slotted Flat Head Screws

Steel Slotted Flat Head Screws

18-8 Stainless SteelSlotted Flat Head Screws

316 Stainless SteelSlotted Flat Head Screws

Steel Torx Flat Head Screws

Metric Sealing Flat Head Screws

Sealing Flat Head Screws

Tamper-ResistantTorx Flat Head Screws

Tamper-Resistant DrilledSpanner Flat Head Screws

Tamper-Resistant HexDrive Flat Head Screws