- METRIC PRODUCTS
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Metric Bolts have external coarse or fine machine screw threads. In general, bolts are larger than screws but the exceptions are Flange Screws and Hex Head Cap Screws, which are available in many of the same sizes as Hex Head Bolts. Head types are mostly hex head, but Carriage Bolts have a low-height dome head, Flange Bolts have a hex flange head and Shoulder Bolts have a cylindrical head. All are externally wrenched except for Carriage Bolts (their head remains stationary) and Shoulder Bolts (they have a hex socket recess that is internally wrenched). All are fastened using a nut or installed in a threaded hole. The group is comprised of: Carriage Bolts, Flange Bolts, Hex Head Bolts, Machine Bolts, Shoulder Bolts and Tap Bolts.
Metric Nuts are internally threaded with coarse or fine machine screw threads and mate with external threads. Most are free-spinning, but some lock nuts exhibit prevailing torque, which is constant friction that requires them to be wrenched on and off. Most are hex and reversible (installed either way) but there are some differences: Flange Nuts have a hex top section and a large protruding flange; Keps and K-Lock Nuts are hex nuts with free-spinning permanently attached washers; Nylon Insert Lock Nuts have a captive undersized nylon washer opposite their bearing surface; All Metal Prevailing Torque Lock Nuts have a cone-shaped top; Weld Nuts have weld projections on one side only; and Wing Nuts have, well, a unique wing shape of their own. Ranging from very small sizes to very large sizes, the family includes Coupling Nuts, Flange Nuts, Hex Nuts, Jam Nuts, Keps Nuts, K-Lock Nuts, Machine Screw Nuts, Nylon Insert Lock Nuts, Prevailing Torque Lock Nuts, Weld Nuts and Wing Nuts.
Metric Pins are usually not threaded. Still, they can be used to retain or fasten items. Cotter Pins have what resembles a head (an eye). Dowel Pins are solid parallel pins; Pull Out Dowel Pins have internals threads to assist in removal; and Slotted Spring Pins are hollow with a lengthwise slot.
Metric Rings are either external or internal type and are either axially or radially installed into a shaft groove to create a removal shoulder that is used to retain components. Based on their design, some can tolerate high thrust loads. Popular types are External Retaining Rings, External E-Type Circlips and Internal Retaining Rings.
Metric Rods have coarse or fine machine screw threads, are fully threaded from end to end and are usually 1 meter (1000 mm) in length. It is not uncommon to see nuts at each end.
Metric Screws have external coarse or fine machine screw threads and sizes run from very small to really large—so large that they are considered bolts. Some are headless, like Set Screws, some are externally wrenched, like Flange Screws and Hex Head Cap Screws, but most are internally wrenched. Aside from hex and hex flange heads and headless Set Screws, head types are Button, Cheese, Flat, Oval and Pan and cylindrical Socket Heads. Drive styles include 6 Lobe, Hex Socket, Phillips, Pozi and Slotted. Thread Rolling Screws form threads in a drilled or punched hole; all others require a nut or threaded hole. The collection encompasses a wide selection of Flange Screws, Hex Head Cap Screws, Machine Screws, Set Screws, Shoulder Screws, Socket Cap Screws and Threading Rolling Screws.
Metric Studs are not continuously threaded from end to end—an unthreaded shoulder separates the unequal lengths of coarse machine screw threads. They are short—less than about 200 mm long—and the tap end, which is the short threaded end, is supplied with an interference thread fit.
Metric Tools are Hex Keys formed in the shape of the letter "L" and are used to drive hex sockets found in Set Screws, Socket Cap Screws and Shoulder Bolts. Short Arm and Long Arm styles are available.
Metric Washers are divided into two groups: Flat Washers, which primarily serve to increase the bearing surface area, and Lock Washers, which help to "lock" the bolted joint. Washers are always matched to the bolt/screw size; some Flat Washers are available with different outside diameters. Lock Washers use different mechanisms to prevent loosening. Those methods include spring, split, tooth and serrated. For Flat Washers, there are three main types: Flat Washers without Chamfer, Small Pattern Flat Washers and Fender Washers. There are more different types of Lock Washers: Curved Spring Lock Washers, Waved Spring Lock Washers, Split Lock Washers with Flat Ends, High Collar Split Lock Washers, External Tooth Lock Washers, Internal Tooth Lock Washers, External Tooth Serrated Lock Washers, Internal Tooth Serrated Lock Washers and External Tooth Countersunk Serrated Lock Washers.
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