M2.5 M5 Stainless Steel Thumb Screw ASTM B7 B7M Spade head thumb screw Custom size

Thumb screws are multi-purpose fasteners designed for manual tightening and loosening without requiring tools. Their large, knurled heads provide excellent grip for hand operation, making them ideal for applications where space constraints prevent tool use or where frequent access is needed.

• Tool-free installation and removal
• Knurled edges for enhanced grip
• Optional screwdriver slot in head
• No washers required for most applications
• Ideal for maintenance panels and frequently accessed components

Our thumb screws are manufactured from high-quality stainless steel alloys, offering excellent corrosion resistance and durability. Stainless steel is an alloy containing iron, chromium, and nickel that forms a protective chromium oxide layer for corrosion resistance.

• Clean with mild detergents and soft cloth
• Avoid acidic or alkaline cleaners
• Use stainless steel stain removers for stubborn dirt
• Alcohol or vinegar can be used for light cleaning
• Always dry thoroughly after cleaning

304 stainless steel is the most commonly used grade, offering excellent corrosion resistance and formability. It contains at least 18% chromium and 8% nickel. The "L" designation indicates lower carbon content (0.03%), reducing susceptibility to intergranular corrosion.

Our thumb screws are carefully packaged in small packs, cartons, and pallets to ensure safe delivery. Each shipment undergoes rigorous quality inspection before dispatch from our facility in Shenzhen.