25# Six-petals Flower M6 Yellow Thumb Screws Hand Grip Knob Bolts Thumbscrew

These thumb screws use a standard M6 metric coarse thread with a 1.0mm pitch. They are compatible with any M6-tapped hole, M6 T-nut, or M6 threaded insert that accepts a standard coarse-pitch fastener.

Measure the total thickness of the panels or material the screw must pass through, then add 3–5mm for full thread engagement in the nut or insert. For example, a 10mm panel with a standard M6 nut typically works well with the M6×16 or M6×20 option. If in doubt, size up — a longer shank can always be used with a spacer or deeper insert.

These thumb screws are intended for indoor workshop and light-industrial use. For outdoor or high-humidity environments, consider applying a thin coat of anti-corrosion spray to the shank, or contact us to confirm suitability for your specific conditions.

Yes. M6 flower thumb screws are widely used for bed leveling on FDM 3D printers that use M6 threaded rods or M6 T-nuts in the bed carriage. The 25mm head diameter provides comfortable finger adjustment during repeated leveling cycles. Verify your printer's thread specification before ordering.

For a 25mm-diameter knob head, typical hand-tightening generates approximately 1–3 N·m of torque depending on grip force. These screws are designed for clamping and positioning loads, not structural tension. Do not use them as a substitute for hex-head bolts in load-bearing joints.

Multi-piece packs (2, 5, or 10 pieces) are cost-effective when you need matching knobs across a machine build — for example, four bed-leveling points on a 3D printer or six access-panel fasteners on an enclosure. A single-piece pack is ideal for a direct replacement when one knob is lost or damaged.

Yes. The M6 shank is fully threaded and accepts any standard M6 nut — hex, flange, nylon-insert lock nut, or wing nut. Pair with a flange nut for a wider bearing surface on softer materials like plywood or acrylic.