About Rounded Head Screws
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How to Install Key-Locking Inserts
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Metric 18-8 Stainless Steel Button Head Torx Screws


18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. All are passivated for added protection against oxidation and corrosion. A Torx drive has more points of contact than other drives, allowing you to tighten the screw without damaging the recess. For Torx tools, see Torx bits, keys, and drivers. Length is measured from under the head.
Lg., mm | Threading | Head Dia., mm | Head Ht., mm | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|
M4.5 × 0.75 mm | |||||||||
8 | Fully Threaded | 8.54 | 2.20 | T20 | 100,000 | ASME B18.3.4M | 50 | 000000000 | 000000 |
10 | Fully Threaded | 8.54 | 2.20 | T20 | 100,000 | ASME B18.3.4M | 50 | 000000000 | 00000 |
12 | Fully Threaded | 8.54 | 2.20 | T20 | 100,000 | ASME B18.3.4M | 50 | 000000000 | 00000 |
18-8 Stainless Steel Key-Locking Inserts

Made of stainless steel, these inserts have good corrosion resistance. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. Inserts may be mildly magnetic. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.
Inserts with a thin wall are often used in small holes or near the edge of a workpiece.
Screw-Locking Key-Locking Inserts

Forming the strongest hold of any of our threaded inserts, these inserts have a distorted internal thread to lock screws into place and keys that drive into surrounding material to prevent slipping and rotating. This creates a mechanical lock, which is stronger than the chemical lock from adhesive on thread-locking inserts. Because they’re made of a solid piece of metal, these inserts are also stronger than helical inserts, which are made of coiled wire. They're often used in molds, tools and dies, and suspension systems in vehicles to create completely new threads, add strong threads in soft metal, or replace existing threads that are damaged or need to be resized.
A dry-film lubricant makes it easy to install them and screw fasteners in. To install, use a tap to create the threads in your material and an installation tool to drive the keys into the material. All are made to tight tolerances with strictly controlled materials. Many inch sizes also meet military or aerospace standards for dimensions and material.
These inserts resist corrosion in wet environments. Inserts with thin walls are best for small holes or near the edge of a workpiece. They’re often used in electronics that require small fasteners.
Parallel Handscrew Clamps

The matching jaws are ground flat for a firm grip and even pressure when clamping smooth surfaces. The two screws turn independently to make small, individual adjustments to each jaw.
Opening | |||||||
---|---|---|---|---|---|---|---|
Max. | Min. | Reach | Holding Capacity | Arm Material | Thumb Screw Hole Dia. | Each | |
1 1/4" | 0" | 3/4" | Not Rated | Steel | 1/8" | 0000000 | 000000 |