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Nuts & Bolts

Nuts, bolts, setscrews, and grub screws in metric and imperial thread. Sealey assortments cover common workshop sizes—M4 to M16 metric, ¼″ to ½″ UNF—so you can match fastener to hole without hunting for loose singles. Steel hex nuts, nylon locknuts, serrated flange nuts for vibration, and socket-head grub screws where the head needs to sit flush.

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Showing 1–48 of 115 results

Pick an assortment by thread system and application. If you work on older British or American machinery, UNF assortments (¼″, ⅜″, ½″) keep the correct pitch ready. Metric threading dominates newer equipment—M5, M6, M8, M10 cover most frame, bracket, and cover-plate jobs. Nylon locknuts grip without needing a split pin or thread-locking compound; the nylon insert deforms under load and resists backing out under vibration. Serrated flange nuts combine a wider bearing surface with teeth that bite into the material, useful on sheet metal or soft alloy where a plain nut might spin. Grub screws (DIN 916 cup-point common in these sets) lock pulleys, collars, and shaft components without protruding—tighten into a flat or dimple on the shaft so the part can't rotate. High-tensile setscrews (grade 8.8 or above) matter when the fastener itself takes shear or tensile load, not just clamping force; standard mild-steel fixings will stretch or shear under those loads. Check thread engagement—metric fine-pitch threads (not common in these assortments) need more turns to develop the same strength as coarse. If you're replacing a fastener, match the grade marking on the head; mixing grades in a joint can cause uneven preload and early failure.