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

Screw Size

Fastener Head Type

Rounded Head Style

Drive Size

Head Height

Threading

Partially Threaded

Finish

Thread Spacing

Thread Direction

Socket Shape

REACH

RoHS

DFARS Specialty Metals

Export Control Classification Number (ECCN)

Thread Type

Performance

Tamper Resistant

Tip Type

For Nut Size

Thread Fit

Unified Standard Class 3A

Hardness

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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

Screwdriver Bits

Screwdriver Bits

Pair with drivers to turn screws

Sockets

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

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