When a project demands hand-tightened fasteners that can be adjusted without reaching for a screwdriver, standard hex bolts fall short. Makers, engineers, and DIY builders who work with enclosures, jigs, fixtures, and panel assemblies need a fastener that combines grip, corrosion resistance, and visual clarity — all in one compact package. These M4 knurled thumb shoulder screws are designed for exactly that scenario.
Each pack contains 5 screws combining a stainless steel threaded shank with an aluminum knurled head. The M4 thread diameter (4 mm / ~0.157 in) pairs with shoulder lengths ranging from 5 mm to 100 mm (~0.20 in to ~3.94 in). The knurled grip ring is typically 10–14 mm in outer diameter, providing a secure finger purchase even in confined spaces. Ten anodized color options — including Jewel Blue, Emerald, Golden Yellow, Burgundy Red, Black, Silver, Dark Purple, Rosy Red, Sky Blue, and Brownish Orange — allow color-coding by function, zone, or assembly stage.
Typical use cases include 3D printer frame assemblies where tool-free bed leveling knobs are needed, electronics enclosures requiring frequent panel removal, woodworking jigs with adjustable stops, and laboratory or prototyping fixtures where repeated hand-adjustment is part of the workflow. The anodized aluminum head resists light corrosion and surface wear, while the stainless steel shank handles the mechanical load.
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Tool-Free Hand Tightening
The knurled aluminum grip ring allows firm finger tightening and loosening without any tools, speeding up adjustments on jigs, fixtures, and access panels.
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Dual-Material Construction
Stainless steel threaded shank provides tensile strength and corrosion resistance; the aluminum knurled head keeps overall weight low while adding a tactile grip surface.
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Wide Length Range: 5–100 mm
23 shoulder length options from 5 mm to 100 mm (~0.20 in to ~3.94 in) cover thin panel fastening through deep-reach fixture applications in a single product family.
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10 Anodized Color Options
Anodized finishes in 10 distinct colors enable color-coded assembly systems, making it easy to identify adjustment points, torque zones, or component groups at a glance.
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Corrosion-Resistant Shank
The stainless steel shank resists rust and oxidation in workshop, light outdoor, and humid environments, extending service life compared to plain carbon steel alternatives.
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5-Piece Pack for Practical Quantities
Sold in packs of 5, these screws suit single-project builds, prototyping runs, and replacement needs without requiring bulk minimum orders.
