Machine screws M4-M8 | assortment box | 375 pieces

Machine screw assortment box with various nuts, washers, hose clamps, and split pins, totaling 375 parts. It is made of A4 / AISI 316 acid-proof stainless steel and designed to withstand moisture, salt, chemicals, and large temperature fluctuations. The assortment box is used where durability and maximum corrosion resistance are critical – especially in marine environments, industry, or outdoor installations.

AREA OF USE

The A4 machine screw assortment box with 375 parts is intended for fastening and mounting machines, panels, fixtures, and other equipment in environments such as coastal areas, wet rooms, food production, or chemical plants. The metric thread provides a secure, vibration-resistant, and permanent fastening in combination with nuts and washers, without the need for extra fittings. The screws are easily installed with a screwdriver or socket wrench depending on the head type and are suitable for both thin sheet metal and solid structures. Thanks to the acid-proof stainless steel, the product requires minimal maintenance and has a long service life even under extreme conditions.

TECHNICAL SPECIFICATIONS

• Product type: Assortment box
• Standard: Various
• Grade: A4 / AISI 316
• Material class: A4-70
• Functions: Various machine screws with accessories

FREQUENTLY ASKED QUESTIONS (FAQ)

What does the 375-piece assortment box contain and which applications does it cover?

This large-scale assortment box is a complete service and maintenance kit developed to solve urgent or planned assembly and repair needs. It contains a wide variety of:

• Threaded fasteners: Machine screws in several lengths together with matching hex nuts and flat washers.

• Locking elements: Split pins for secure mechanical locking of bolts, rigging pins, and castle nuts.

• Hose and pipe fastening: Worm gear hose clamps in A4 for leak-free hose connections in cooling, bilge pump, and fuel systems.

Why is such a versatile kit in acid-proof A4 / AISI 316 indispensable on a boat or in a workshop?

When hose leaks, loose bolts, or faulty fasteners occur in harsh environments, standard galvanized steel components that quickly rust away are not enough. Acid-proof A4 steel (AISI 316 / 1.4401) is alloyed with molybdenum, which provides maximum resistance to pitting, saltwater, and aggressive chemicals. Having all these essential components in A4 quality gathered in one box saves critical time during emergency maintenance.

What should one consider when mounting hose clamps and threaded fasteners in A4 steel?

• Use the right tools: When tightening A4 hose clamps, a socket or hex driver is recommended over a flat-head screwdriver to prevent the tool from slipping and damaging the hose.

• Reduce friction: Stainless steel threads can suffer from galling during hard tightening. A drop of assembly paste on screw threads and the hose clamp screw ensures smooth tightening and easy future disassembly.

• Lock with a split pin: Always bend the legs of the split pin out properly after insertion to ensure it cannot vibrate loose.