UNF Thread Hex Head Screws | McMaster-Carr

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System of Measurement

Thread Size

Length

Material

651 Silicon Bronze

Stainless Steel

Fastener Head Type

Threading

Partially Threaded

Drive Style

Tamper-Resistant Hex

Finish

Corrosion-Resistant Coated

Phosphate Coated

Titanium Carbon Nitride (TiCN) Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Fastener Strength Grade/Class

Thread Spacing

Thread Type

Head Height

Head Width

Thread Direction

Specifications Met

Federal Specification

Socket Head Profile

Tensile Strength

Less than 20,000 psi

20,000 psi to 29,999 psi

30,000 psi to 49,999 psi

50,000 psi to 99,999 psi

100,000 psi or greater

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Tip Type

Screw Features

Head Diameter

Drive Size

DFARS Specialty Metals

REACH

RoHS

Compliant with Exemptions

Export Control Classification Number (ECCN)

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Fastening and Joining

Hex Head Screws

Hex Head Screws

Used with nuts to create a stronger joint than flat and rounded screws

Socket Head Screws

Socket Head Screws

With a deeper drive than flat and rounded head screws, these withstand more torque for a tighter hold

Tapping Screws

Fasten a range of materials together without needing to tap the hole first

Rounded Head Screws

Rounded Head Screws

Sit just above the surface for a low-profile finish and hold tighter than flat head screws

Flat Head Screws

Flat Head Screws

Fit in countersunk holes for a flush finish that won't snag on surrounding parts

Set Screws

Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads

Shoulder Screws

Shoulder Screws

Rotate parts around the cylinder under the head to guide and align them during installation

Captive Panel Screws

Captive Panel Screws

Secure panels and enclosures while still having access to them

Tighten and loosen by hand without the need for tools

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)