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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Length Length

	Material Material

Stainless Steel

Steel

Nickel

	Finish Finish

Cadmium Plated

Passivated

Zinc Yellow-Chromate Plated

Black Oxide

	Specifications Met Specifications Met

Mil. Spec.

Fed. Spec.

NAS

ASTM

ASME

SAE

	Head Type Head Type


Socket	Hex

Rounded	Flat

Headless

	Drive Style Drive Style


Hex	External Hex

Phillips	Slotted

	Threading Threading

	Fully Threaded
	Partially Threaded

	Head Height Head Height

	Head Diameter Head Diameter

	Thread Type Thread Type

	Countersink Angle Countersink Angle

82°

100°

	Tensile Strength Tensile Strength

	Thread Fit Thread Fit

Class 2A

Class 3A

Not Rated

	Hardness Hardness

	Thread Spacing Thread Spacing

Coarse

Fine

	Rounded Head Style Rounded Head Style


Pan	Cheese

Fillister

	Drive Size Drive Size

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 5	Grade 8

	Head Width Head Width

	Flat Head Profile Flat Head Profile


Standard	Undercut

	Shoulder Length Shoulder Length

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989 Products

Screws and Bolts

Mil. Spec. 18-8 Stainless
Steel Socket Head Screws

Choose these screws for their adherence to strict military standards for material and construction. Screws are 18-8 stainless steel for good chemical resistance.

Mil. Spec. Alloy Steel
Socket Head Screws

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

Mil. Spec. 18-8 Stainless
Steel Hex Head Screws

Choose these screws for their adherence to strict military standards for material and construction. Screws are 18-8 stainless steel for good chemical resistance.

Mil. Spec. High-Strength
Steel Hex Head Screws

Choose these screws for their adherence to strict military standards for material and construction. Their high tensile strength means they can be used in demanding, high-stress applications.

Mil. Spec. Medium-Strength
Steel Hex Head Screws

Choose these screws for their adherence to strict military standards for material and construction. Use them to fasten most machinery and equipment.

Nickel Alloy Hex Head Screws

More corrosion resistant than 316 stainless steel, nickel alloy screws have excellent resistance to salt water and some acids.

Mil. Spec. Stainless Steel
Pan Head Phillips Screws

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

Mil. Spec. Steel Pan
Head Phillips Screws

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

18-8 Stainless Steel Narrow
Cheese Head Slotted Screws

More corrosion resistant than steel, and almost as strong, these 18-8 stainless steel screws have a narrower head than pan head screws to fit into tight spaces. They’re often used in electrical panels and next to flanges and raised surfaces in humid, damp, and washdown environments, but will corrode if exposed to salt water or chemicals.