Tri-Groove Head Bolts | McMaster-Carr

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System of Measurement

Thread Size

Length

1 1/4" to 1 3/8"

Head Diameter

Material

High-Speed Steel

Fastener Head Type

Drive Size

Screw Size

Rounded Head Style

Head Height

Threading

Partially Threaded

Finish

Thread Spacing

Socket Shape

RoHS

REACH

DFARS Specialty Metals

Export Control Classification Number (ECCN)

Thread Type

Performance

Tamper Resistant

For Nut Size

Thread Fit

Unified Standard Class 3A

Tip Type

Hardness

Tensile Strength

30,000 psi to 99,999 psi

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40 Products

Rounded Head Screws

Tamper-Resistant Tri-Groove-Drive Steel Round Head Screws

Tamper-Resistant Tri-Groove-Drive Steel Round Head Screws

Sloped with three notches, so they're nearly impossible to grip without the proper tool

Other Products

Sockets

Turn fasteners with an external drive style without slipping and damaging the drive

Screwdriver Bits

Screwdriver Bits

Pair with drivers to turn screws

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