M3 DIN933 Hex Bolt

QS Fastener: M3 DIN933 Hex Bolt

Name: M3 DIN933 Hex Bolt
Standard: DIN933
Material: SS304
Size: M3
Lenght: 8
Surface: Natural color

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M3 DIN933 Hex Bolt, natural SS304 stainless steel, 8 mm fully threaded, corrosion resistant and high tensile—first choice for electronics, instruments and miniature structural parts.

M3 DIN933 Hex Bolt Specification Range
1. Nominal diameter d
1.1 Standard series: ISO 4014/4017 (GB/T 5782/5783) cover nominal diameters from M1.6 to M52. M1.6, M2 and M2.5 are mainly used in micro-electronic devices, while M45 and above are employed in heavy steel structures. The M3 DIN933 Hex Bolt sits in the middle of the series, balancing strength and versatility.
1.2 Regular availability: M3 DIN933 Hex Bolt and sizes M4–M36 are kept in stock, accounting for over 92 % of sales; M42, M45, M48 and M52 require 3–4 weeks’ lead time.

1.3 Limit tolerance: the 6g tolerance band for the thread major diameter has an upper deviation es=0; the lower deviation ei varies with pitch—for example, M3 DIN933 Hex Bolt has ei=-20 μm (P=0.5 mm), ensuring smooth engagement with 6H nuts.

2. Length L
2.1 Standard lengths: ISO stipulates increments of 2 mm (L≤12 mm), 5 mm (12 mm

2.2 Range: 2 d–500 mm, i.e., M3 DIN933 Hex Bolt is 6 mm minimum, M52 is 104 mm minimum; when L>500 mm, extra-long versions can be produced by friction welding of segmented blanks or local upsetting, with 100 % UT inspection of the weld.

2.3 End chamfer: for L≤100 mm, the thread end is chamfered 45°×0.5P; for L>100 mm, a 20° chamfer plus protective sleeve is used to prevent handling damage. M3 DIN933 Hex Bolt is usually L≤100 mm, so 45° chamfer is standard.

3. Thread
3.1 Metric coarse: standard pitches per ISO 724, e.g., M3 DIN933 Hex Bolt×0.5; the 6g pitch-diameter tolerance band width is TD2=90 μm, surface formed by rolling or thread-rolling, Ra≤3.2 μm.

3.2 Fine pitch: one or two steps finer than coarse, e.g., M3 DIN933 Hex Bolt×0.35, supplied to order; fine threads require a larger root radius (Rmin=0.125P) to reduce stress concentration, suitable for vibrating conditions.

3.3 Thread length b: ISO 4014 specifies b=2 d+6 mm (short thread) or b≈L-5P (long thread) to define clamp length and engagement with mating nuts. For M3 DIN933 Hex Bolt, short thread b=12 mm covers most thin-plate connections.

4. Material & mechanical properties
4.1 Carbon steel: grade 8.8 uses cold-heading wire rod ML40Cr, quenched and tempered to 26-34 HRC; grade 10.9 uses SCM435, tempered at 420 °C, ensuring tensile strength Rm≥1040 MPa. M3 DIN933 Hex Bolt grade 8.8 has a minimum breaking torque of 0.9 N·m.

4.2 Stainless steel: A2-70 is produced from 304 (06Cr19Ni10), solution-treated at 1010 °C/water quenched, grain size ≥5; A4-80 uses 316L (022Cr17Ni12Mo2) with Mo≥2.5 % and pitting resistance index PREN≥24. A2-70 M3 DIN933 Hex Bolt is commonly used in food machinery.

4.3 Surface treatment: carbon steel parts receive 5–8 μm Zn-Ni alloy plating, showing no red rust after 96 h neutral salt spray; stainless parts are passivated to form a 1–3 nm Cr2O3 film, withstanding 500 h salt spray. Zn-Ni plated M3 DIN933 Hex Bolt triples salt-spray life.

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