S-99607A281 M4 x 30 mm Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual grip and torque application with knurled round head design, eliminating the need for tools in frequent adjustments
• Superior corrosion resistance in demanding environments due to 18-8 Stainless Steel construction, ensuring long-term reliability
• High mechanical strength and durability with 80,000 psi tensile strength and Rockwell B85 hardness, resisting deformation under load
• Secure and precise fit with Class 6g coarse metric thread (M4 x 0.7 mm), enabling quick assembly and reliable fastening
• Stable seating and reduced surface damage from the flared collar design, distributing pressure evenly on mounted surfaces
• Full 30mm thread engagement for maximum holding power in a wide range of material thicknesses
• Compliance with global environmental and safety standards including RoHS 3 and REACH, ensuring safe use in regulated industries

Professional Applications & Engineering Value

This M4 thumb screw is engineered to solve common industrial challenges where tool-less, rapid access and corrosion resistance are critical. The 18-8 stainless steel material provides excellent resistance to rust and oxidation, making it ideal for use in electronics enclosures, machinery panels, and outdoor equipment. The knurled head texture and flared collar deliver a non-slip grip and prevent over-tightening damage, while the fully threaded M4 x 0.7 mm coarse thread ensures quick installation and strong retention in plastics, sheet metal, and assembled components. Its right-hand thread and Class 6g fit offer consistent performance in high-vibration or frequent-adjustment settings, reducing maintenance downtime and improving operational efficiency.

Specification Summary & Compliance

This thumb screw adheres to metric thread standards with M4 size, 0.7 mm pitch, and Class 6g thread fit for precise dimensional accuracy. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances. The product features a 30 mm length, fully threaded design, and is made from 18-8 stainless steel with specified mechanical properties including 80,000 psi tensile strength and Rockwell B85 hardness.