NAS Screws | McMaster-Carr

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Specifications Met

NAS

System of Measurement

Thread Size

Length

Fastener Head Type

Material

Drive Style

Threading

Socket Head Profile

Finish

Zinc Yellow-Chromate Plated

Military Specification

Army-Navy Specification

Military Specification

Countersink Angle

82°

100°

Tensile Strength

30,000 psi to 99,999 psi

100,000 psi or greater

Head Height

Drive Size

Certification

Thread Direction

Thread Type

Rounded Head Style

Flat Head Profile

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Not Rated

DFARS Specialty Metals

REACH

RoHS

Compliant with Exemptions

Not Compliant

Export Control Classification Number (ECCN)

EAR99

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753 Products

Screws and Bolts

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 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.

High-Strength A286 Stainless
Steel Socket Head Screws

Often used to fasten parts in engines and turbines, these are our strongest stainless steel screws. They are comparable in strength to alloy steel with the corrosion resistance of 18-8 stainless steel.

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.

Wire-Lockable Rounded Head Screws

Wire these screws together through the hole in the head for better vibration resistance than any other rounded head screw.

Vibration-Resistant Sealing Rounded Head Screws

A nylon patch bonded to the threads adds friction to resist loosening from vibration.

High-Strength Steel Hex Head
Screws with Phillips Drive

When clearance for a wrench is limited, these screws have a Phillips drive so you can install them with a screwdriver. They are used for high-strength fastening.