Counterbore Screws | McMaster-Carr

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System of Measurement

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Material

Carbide-Tipped Steel

Grade 2 Titanium

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Threading

Partially Threaded

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Titanium Nitride (TiN) Coated

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External 12-Point

Hex with Pilot Recess

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Specifications Met

Fed. Spec. FF-S-86

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Tensile Strength

Less than 100,000 psi

100,000 psi to 119,999 psi

120,000 psi to 149,999 psi

150,000 psi to 169,999 psi

170,000 psi or greater

Fastener Strength Grade/Class

Thread Fit

Metric Class 4g6g

Metric Class 4h

Metric Class 5g6g

Metric Class 6g

Unified Standard Class 2A

Unified Standard Class 3A

DFARS Specialty Metals

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8,667 Products

Fastening and Joining

Socket Head Screws

Socket Head Screws

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

12-Point Screws

12-Point Screws

12 contact points handle more torque than a hex head while a flange eliminates the need for a washer

Fabricating and Machining

Counterbores

Enlarge the top of a hole to install socket and hex head screws flush with the surface

Counterbore Insert Holders

Counterbore Insert Holders

Pair with inserts to create flat-bottom holes

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