Hand-adjustable fasteners for small assemblies, delivering secure, repeatable fixing for workshop and kit use, PrecisionGeek Knurled Shoulder Thumb Screws. Knurled heads make on-the-fly adjustments quicker and less fiddly so projects stay on track. Are these screws robust enough for regular use and worth adding to a toolbox?
⚡ At a Glance
- • Holding Strength: Secure fastening using M5 x 20mm thread and 29mm total length
- • Best for: Hobbyists, instrument makers and engineers needing quick hand adjustments
- • Not ideal for: High-load structural joints that require torque from tools
Set of four knurled shoulder thumb screws with M5 x 20mm threading and 29mm overall length. Manufactured in the EU from blackened steel 11SMN30 for a protective finish and sturdy feel.
Quick, tool-free adjustments – with knurled head and shoulder
Knurled head diameter measures 16mm with a head thickness of 4mm, and a shoulder length of 9mm creating a tactile grip and defined seating surface. The textured head surface gives purchase for thumb and finger operation.
Fast, repeatable thumb-tightening helps speed up setup and minor adjustments on jigs, panels and fixtures.
Consistent engagement – thanks to M5 x 20mm threading
Thread size specified as M5 x 20mm within a 29mm total length yields a predictable threaded portion relative to the shoulder. That geometry helps ensure reliable engagement with components designed for M5 fasteners.
Predictable fit reduces the chance of cross-threading and simplifies repeated assembly and disassembly.
Durable finish for workshop use – with blackened steel 11SMN30
Material listed as blackened steel 11SMN30 and manufacture noted as EU origin, indicating a heat-treated steel grade with a protective blackened surface. European production suggests consistent quality control.
Robust material and finish extend working life and keep fasteners looking consistent under regular use.
✨ The 4 Key Reasons for PrecisionGeek Knurled Shoulder Thumb Screws
- Knurled head (16mm) – Faster thumb-tightening with reliable non-slip grip during adjustments
- Shoulder stop (9mm) – Prevents over-insertion for consistent depth across repeated fittings
- Low-profile head (4mm) – Keeps clearance in tight assembly spaces for neater builds
- Set of 4 – Handy multi-pack for small projects and quick replacements
📋 Technical Details at a Glance
- Category: BISS
- Thread Size: M5 x 20mm
- Total Length: 29mm
- Head Diameter: 16mm
- Head Thickness: 4mm
❓ Frequently Asked Questions
Q: How many screws are included in the pack?
A: A set of four screws is supplied, suitable for small projects or as spares.
Q: What material and finish are used?
A: Blackened Steel 11SMN30 is specified, with manufacture in the EU indicating a protective dark finish and metal grade.
Q: Are the heads suitable for hand tightening?
A: Knurled head diameter of 16mm, head thickness 4mm and a 9mm shoulder create a design intended for comfortable thumb and finger operation.
🏆 Our Verdict
Ideal for hobbyists and technicians who need quick, repeatable hand adjustments, particularly on jigs, panels and light assemblies. The combination of knurled heads, defined shoulder and M5 threading delivers predictable fit and durable performance. While costs vary by seller, robust steel construction and EU manufacture suggest good long-term value for workshop use.
