M4 Knurled Thumb Nuts High Type – A1 Stainless Steel DIN 466 Hand Tighten Round Knob Fasteners 16mm OD x 9.5mm for 3D Printers, Machines & Electronics (Pack of 4)

• A1 STAINLESS STEEL – CORROSION-RESISTANT & BUILT FOR LONG-TERM RELIABILITY Manufactured from A1 grade stainless steel — selected for its excellent corrosion resistance, strength, and clean machined finish. Unlike mild steel or plated alternatives that rust, pit, or discolour over time, these A1 stainless knurled thumb nuts maintain their appearance and performance in humid, industrial, and workshop environments, making them suitable for permanent installations in electronic enclosures, machine panels, and precision instruments.
• DIN 466 HIGH TYPE – PRECISION METRIC STANDARD FOR CONSISTENT FIT EVERY TIME Conforming to the DIN 466 high type standard, these M4 thumb nuts are precision-machined to tight dimensional tolerances: 16mm outer diameter, 9.5mm height, and M4 x 0.7mm thread pitch. The high type profile provides a deeper grip surface and greater thread engagement than low-type (DIN 467) variants, delivering more secure hand-tightened clamping with less risk of the nut working loose under vibration or repeated adjustment.
• KNURLED GRIP SURFACE – TOOL-FREE HAND TIGHTENING IN SECONDS The precision diamond-knurled outer surface provides exceptional finger grip for fast, secure hand tightening and loosening without spanners, screwdrivers, or any other tools. The knurl pattern bites firmly even with oily or damp hands, making these ideal for any application requiring frequent adjustment, removal, or repositioning — saving significant time compared to hex nuts in high-cycle assembly environments.
• PACK OF 4 – IDEAL FOR 3D PRINTERS, MACHINE TOOLS & ELECTRONIC EQUIPMENT Each pack contains 4 x M4 high type knurled thumb nuts — the most common quantity needed for 3D printer bed levelling, panel fastening, instrument enclosures, jigs, fixtures, machine guards, and toolbox fittings. Widely used across 3D printing, electronics, light engineering, laboratory equipment, and DIY fabrication wherever tool-free hand adjustment is required on M4 threaded bolts, studs, or rods.
• UNIVERSAL M4 THREAD – COMPATIBLE WITH ALL STANDARD M3 BOLTS, STUDS & SCREWS With a standard M4 x 0.7mm coarse pitch right-hand thread, these knurled thumb nuts are universally compatible with all M4 metric bolts, machine screws, threaded rods, and studs across all major brands and standards. Available across the full metric range — if you need M4, M5, M6 or larger sizes, our full knurled thumb nut range covers every common metric thread size in both high and low type configurations.

A1 stainless steel knurled thumb nuts / Bolt Knurled Nut Item Specifications: M3 Specifications Thread Diameter: 3mm Thread Pitch: 0.50mm Overall Diameter: 12mm Thin Type Overall Height: 3mm High Type Overall Height: 7.5mm M4 Specifications Thread Diameter: 4mm Thread Pitch: 0.70mm Overall Diameter: 16mm Thin Type Overall Height: 4mm High Type Overall Height: 9.5mm M5 Specifications Thread Diameter: 5mm Thread Pitch: 0.80mm Overall Diameter: 20mm Thin Type Overall Height: 5mm High Type Overall Height: 11.5mm M6 Specifications Thread Diameter: 6mm Thread Pitch: 1.0mm Overall Diameter: 24mm Thin Type Overall Height: 6mm High Type Overall Height: 15mm