NAS Cap Screws | McMaster-Carr

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100,000 psi or greater

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626 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.

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.

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.

Mil. Spec. Stainless Steel Phillips Flat Head Screws

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

Mil. Spec. Steel Phillips Flat Head Screws

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

Metric 18-8 Stainless Steel
Slotted Flat Head Screws

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

Screws and Bolts

Mil. Spec. Alloy Steel Socket Head Screws

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

High-Strength A286 StainlessSteel Socket Head Screws

High-Strength Steel Hex HeadScrews with Phillips Drive

Mil. Spec. Stainless Steel Pan Head Phillips Screws

Mil. Spec. Steel Pan Head Phillips Screws

18-8 Stainless Steel NarrowCheese Head Slotted Screws

Wire-Lockable Rounded Head Screws

Vibration-Resistant Sealing Rounded Head Screws

Mil. Spec. Stainless Steel Phillips Flat Head Screws

Mil. Spec. Steel Phillips Flat Head Screws

Metric 18-8 Stainless SteelSlotted Flat Head Screws

High-Strength A286 Stainless
Steel Socket Head Screws

High-Strength Steel Hex Head
Screws with Phillips Drive

18-8 Stainless Steel Narrow
Cheese Head Slotted Screws

Metric 18-8 Stainless Steel
Slotted Flat Head Screws