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FAQs

A hexagon head bolt, listed here to D931, has a plain shank under the head with thread on the lower part only. A hexagon head screw, listed to D933, is threaded up to the head and is often called a setscrew. Choose a bolt for a through hole with a nut, and a screw for a tapped hole or thin parts.

8.8 and 12.9 are strength grades for steel fasteners, and 12.9 is the stronger of the two. On this page 12.9 appears on socket head cap screws, and 8.8 on countersunk socket screws, carriage bolts, setscrews and threaded rod. A2 is a stainless steel grade chosen for corrosion resistance, and is not a like-for-like swap for 12.9 on highly loaded joints.

Match the thread to the nut or tapped hole first; the thread filter runs from M2 through common sizes such as M6, M8, M10 and M12 to M36 and larger. Length is measured from under the head on hexagon and socket cap screws, and overall on countersunk screws. Length bands go from up to 25mm to over 200mm.

The three are tightened with a hex key and differ in head shape. A socket cap screw (D912) has a tall cylindrical head that can sit in a counterbore, and is listed in 12.9 graded steel, plain steel and A2 stainless. A button head screw has a low domed head, and a countersunk screw sits flush in a countersunk hole.

Pick a nut with the same thread as the bolt, such as M6 or M16, in a matching material and finish, zinc plated with zinc plated or A2 stainless with A2. The Nuts section includes hex nuts, hex lock nuts and spring nuts. Flat washers spread the load under the head or nut, and spring lock washers help resist loosening.

A parallel key is a rectangular bar that sits in the keyways of a shaft and a hub, pulley or gear so the two turn together. Sizes are given as width x height x length, for example 4x4x25mm, 10x8x20mm or 22x14x90mm. Measure the keyway and the old key before ordering, as the key needs a close fit.

Screws Nuts Bolts & Washers

Fasteners and fixings hold equipment together across every trade sector, and the right thread form, material grade, and head pattern matter as much as the component being joined. This section covers the full range of mechanical fasteners listed on PartsForMachines for direct trade order, from hex bolts and machine screws through to nuts, washers, threaded rods, parallel keys, and retaining clips. Screws & Bolts is the workhorse sub-section, covering machine screws, hex-head bolts, socket-head cap screws, set screws, and self-tapping variants across metric and imperial thread forms. Nuts contains hex nuts, nyloc nuts, flanged nuts, and dome nuts. Washers covers flat, spring, and penny types sized to match the bolt range. Threaded Rods lists continuous studding and cut-length rod for framing, mounting, and adjustment applications. Parallel Keys and Retaining Clips serve shaft and housing assemblies in drivetrains, gearboxes, and power transmission units. Trade buyers select fasteners by thread standard (metric, UNF, UNC), nominal diameter, thread pitch, material grade (zinc-plated, stainless A2 or A4, high-tensile Grade 8.8), and head or drive type. Pack quantities vary from small assortment bags to bulk trade boxes. If a specific application such as track shoe fixings or specialist machinery hardware is uncertain, use Ask Simon on the relevant product page for an instant fitment check. PartsForMachines is an Authorised Distributor and Seller for the fastener brands listed within this section. For bulk pack pricing or trade account queries, contact the team at [email protected] or via WhatsApp 07754288583.
FAQs

A hexagon head bolt, listed here to D931, has a plain shank under the head with thread on the lower part only. A hexagon head screw, listed to D933, is threaded up to the head and is often called a setscrew. Choose a bolt for a through hole with a nut, and a screw for a tapped hole or thin parts.

8.8 and 12.9 are strength grades for steel fasteners, and 12.9 is the stronger of the two. On this page 12.9 appears on socket head cap screws, and 8.8 on countersunk socket screws, carriage bolts, setscrews and threaded rod. A2 is a stainless steel grade chosen for corrosion resistance, and is not a like-for-like swap for 12.9 on highly loaded joints.

Match the thread to the nut or tapped hole first; the thread filter runs from M2 through common sizes such as M6, M8, M10 and M12 to M36 and larger. Length is measured from under the head on hexagon and socket cap screws, and overall on countersunk screws. Length bands go from up to 25mm to over 200mm.

The three are tightened with a hex key and differ in head shape. A socket cap screw (D912) has a tall cylindrical head that can sit in a counterbore, and is listed in 12.9 graded steel, plain steel and A2 stainless. A button head screw has a low domed head, and a countersunk screw sits flush in a countersunk hole.

Pick a nut with the same thread as the bolt, such as M6 or M16, in a matching material and finish, zinc plated with zinc plated or A2 stainless with A2. The Nuts section includes hex nuts, hex lock nuts and spring nuts. Flat washers spread the load under the head or nut, and spring lock washers help resist loosening.

A parallel key is a rectangular bar that sits in the keyways of a shaft and a hub, pulley or gear so the two turn together. Sizes are given as width x height x length, for example 4x4x25mm, 10x8x20mm or 22x14x90mm. Measure the keyway and the old key before ordering, as the key needs a close fit.

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