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Quanzhou Stainless Steel 304 Hex Screw
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Name: Quanzhou Stainless Steel 304 Hex Screw
Standard: DIN933
Material: SS304
Size: M4
Lenght: 40 mm
Surface: Natural color
Standard: DIN933
Material: SS304
Size: M4
Lenght: 40 mm
Surface: Natural color
Quantity
Stainless Steel 304 Hex Screw, strictly conforming to DIN933, is made of premium SS304 stainless steel, offering outstanding corrosion resistance and mechanical strength. With an overall length of 40 mm, it retains the natural finish of stainless steel, giving a clean look and wide applicability. It is ideal for machinery, electronic assemblies and outdoor installations that demand high rust-resistance, ensuring joints remain secure and durable.
How strong is the Stainless Steel 304 Hex Screw?
What is"strength"for a screw?
Strength covers three main aspects:
1. Tensile strength – the maximum pulling force the screw can bear before breaking.
2. Yield strength – the force at which the screw begins to deform permanently and can no longer return to its original shape; this is the more critical value for safe fastening.
3. Shear strength – the force required to cut the screw across its axis.
Strength covers three main aspects:
1. Tensile strength – the maximum pulling force the screw can bear before breaking.
2. Yield strength – the force at which the screw begins to deform permanently and can no longer return to its original shape; this is the more critical value for safe fastening.
3. Shear strength – the force required to cut the screw across its axis.
The"M4"in M4 Stainless Steel 304 Hex Screw means its nominal diameter is 4 mm. This is only a size; final strength is chiefly decided by property class and material.
Property class: the strength ID
Property classes (e.g. 4.8, 8.8, 10.9, 12.9) are international standards that directly define mechanical performance.
Property classes (e.g. 4.8, 8.8, 10.9, 12.9) are international standards that directly define mechanical performance.
Ordinary class (e.g. 4.8):
Tensile strength ≈ 400 MPa
Yield strength ≈ 320 MPa
Used for computer side panels, light bookshelves, appliance housings, etc. If used to hang a heavy shelf, it may stretch slowly and loosen.
Tensile strength ≈ 400 MPa
Yield strength ≈ 320 MPa
Used for computer side panels, light bookshelves, appliance housings, etc. If used to hang a heavy shelf, it may stretch slowly and loosen.
High-strength class (e.g. 8.8):
Tensile strength ≈ 800 MPa
Yield strength ≈ 640 MPa
Tensile strength ≈ 800 MPa
Yield strength ≈ 640 MPa
Common"high-strength"screws found on bicycle parts (bottle-cage bosses, brake calipers), small machines and car interiors. An 8.8 Stainless Steel 304 Hex Screw can easily carry the hanging weight of an adult (~70 kg) without harm.
Ultra-high-strength class (e.g. 12.9):
Tensile strength ≈ 1200 MPa
Yield strength ≈ 1080 MPa
Tensile strength ≈ 1200 MPa
Yield strength ≈ 1080 MPa
Used where extreme reliability is required—die fixtures, precision instruments, robot joints, racing-engine parts. A 12.9 Stainless Steel 304 Hex Screw stays secure under the vibration and shock of a small CNC mill.
Material sets the ceiling
Material is the foundation of every class.
Carbon steel: most common; heat-treatment achieves higher classes (≥8.8 requires treatment).
Stainless steel 304: the grade cited here. Tensile strength is typically 500–700 MPa, roughly equal to 5.6 or 6.8 carbon-steel screws. Its key merit is corrosion resistance, not ultimate strength. Suited to damp settings—outdoor lamps, kitchen gear, non-critical deck hardware on boats.
Stainless steel 316: better against acids and seawater, strength similar to 304.
Alloy steel: used for 12.9 ultra-high screws, usually zinc-plated or blackened for protection.
Material is the foundation of every class.
Carbon steel: most common; heat-treatment achieves higher classes (≥8.8 requires treatment).
Stainless steel 304: the grade cited here. Tensile strength is typically 500–700 MPa, roughly equal to 5.6 or 6.8 carbon-steel screws. Its key merit is corrosion resistance, not ultimate strength. Suited to damp settings—outdoor lamps, kitchen gear, non-critical deck hardware on boats.
Stainless steel 316: better against acids and seawater, strength similar to 304.
Alloy steel: used for 12.9 ultra-high screws, usually zinc-plated or blackened for protection.
Quantified feel: how much can an M4 Stainless Steel 304 Hex Screw really hold?
Simplified theory for an 8.8 grade:
Minimum tensile strength ≈ 800 MPa
Stress area of M4 ≈ 8.78 mm²
Theoretical max pull = 800 × 8.78 ≈ 7 024 N
≈ 716 kg mass at fracture
Simplified theory for an 8.8 grade:
Minimum tensile strength ≈ 800 MPa
Stress area of M4 ≈ 8.78 mm²
Theoretical max pull = 800 × 8.78 ≈ 7 024 N
≈ 716 kg mass at fracture
Note: 716 kg is the ultimate breaking load! In practice a safety factor of 2.5–4 is applied for dynamic or critical joints. Thus, an 8.8 M4 Stainless Steel 304 Hex Screw should be loaded to no more than about 180–280 kg in regular service—still remarkably strong.
Summary
So,"How strong is the M4 Stainless Steel 304 Hex Screw?"It can be as ordinary as a plastic cable-tie (class 4.8) or as rugged as a precision load-bearing member (class 12.9). Its strength is the combined result of property class and material. Always choose according to applied loads, environmental corrosion and safety standards—never by the"M4"size alone.
So,"How strong is the M4 Stainless Steel 304 Hex Screw?"It can be as ordinary as a plastic cable-tie (class 4.8) or as rugged as a precision load-bearing member (class 12.9). Its strength is the combined result of property class and material. Always choose according to applied loads, environmental corrosion and safety standards—never by the"M4"size alone.
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