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M3 Stainless Steel 304 Stud Bolt
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Name: M3 Stainless Steel 304 Stud Bolt
Standard: DIN976
Material: Stainless Steel 304
Size: M3
Lenght: 1000 mm
Surface: Natural color
Standard: DIN976
Material: Stainless Steel 304
Size: M3
Lenght: 1000 mm
Surface: Natural color
Quantity
M3 Stainless Steel 304 Stud Bolt strictly follows DIN976, full length 1000 mm, can be cut to length as required, surface kept in natural 304 finish, offering excellent corrosion resistance and high strength. It is ideal for long-distance fastening and positioning in chemical, food and high-end equipment applications. Delivered as one continuous bar without pre-cutting, installation is more efficient.
In the fastener system, thread accuracy is determined jointly by the tolerance zone and the length of engagement. The current mainstream systems are ISO metric (ISO 965-1/2) and Unified Thread (ASME B1.1). Below, taking a metric 60° external thread as an example, the differences among common accuracy grades and their application fields are given; all data are taken directly from the original standards. — M3 Stainless Steel 304 Stud Bolt follows the same evaluation logic.
1. Accuracy grades and tolerances
ISO designates external threads as 4h, 6g, 6e, 8g and internal threads as 4H, 5H, 6H, 7H; the smaller the number, the narrower the tolerance zone. Take M10 × 1.5 as an example:
• 6g (most common): major diameter d upper deviation 0/-0.032 mm, pitch diameter d2 upper deviation 0/-0.020 mm; suitable for general machinery. When scaled down to the M3 Stainless Steel 304 Stud Bolt size, the major-diameter tolerance shrinks proportionally, but the grade logic remains unchanged.
ISO designates external threads as 4h, 6g, 6e, 8g and internal threads as 4H, 5H, 6H, 7H; the smaller the number, the narrower the tolerance zone. Take M10 × 1.5 as an example:
• 6g (most common): major diameter d upper deviation 0/-0.032 mm, pitch diameter d2 upper deviation 0/-0.020 mm; suitable for general machinery. When scaled down to the M3 Stainless Steel 304 Stud Bolt size, the major-diameter tolerance shrinks proportionally, but the grade logic remains unchanged.
• 4h (precision): major diameter 0/-0.018 mm, pitch diameter 0/-0.011 mm; used in optics and precision instruments. Miniature M3 Stainless Steel 304 Stud Bolt in semiconductor chambers often adopts this grade.
• 8g (coarse): major diameter 0/-0.075 mm, pitch diameter 0/-0.050 mm; used in construction formwork and other low-requirement applications.
• 6e (increased clearance): pitch diameter shifted down by a further 0.040 mm to allow an 8–10 µm coating while still maintaining a 6H/6H fit. For M3 Stainless Steel 304 Stud Bolt, 6e solves assembly issues after light coating.
2. Influence of length of engagement
ISO divides the length of engagement into three groups: S (short), N (normal), L (long). Taking M10 6g as an example:
• S tolerances tighten by 15 %, L tolerances loosen by 25 %, yet a longer engagement inherently reduces loosening risk, so high-precision applications still prefer N. For small parts such as M3 Stainless Steel 304 Stud Bolt, the short-engagement S group is often chosen to balance space and strength.
ISO divides the length of engagement into three groups: S (short), N (normal), L (long). Taking M10 6g as an example:
• S tolerances tighten by 15 %, L tolerances loosen by 25 %, yet a longer engagement inherently reduces loosening risk, so high-precision applications still prefer N. For small parts such as M3 Stainless Steel 304 Stud Bolt, the short-engagement S group is often chosen to balance space and strength.
3. Typical application comparison
• 4h/4H: semiconductor vacuum chambers, aerospace hydraulic valves, guaranteeing ±0.01 mm sealing repeatability. A typical part is M3 Stainless Steel 304 Stud Bolt used in wafer fixtures.
• 4h/4H: semiconductor vacuum chambers, aerospace hydraulic valves, guaranteeing ±0.01 mm sealing repeatability. A typical part is M3 Stainless Steel 304 Stud Bolt used in wafer fixtures.
• 6g/6H: general machinery, automotive chassis, pressure-vessel flanges, accounting for over 80 % of the market.
• 6e/6H: hot-dip-galvanized bolts on outdoor power-transmission towers with 50 µm coating thickness, still meeting the minimum-material condition; miniature M3 Stainless Steel 304 Stud Bolt in outdoor sensor housings can also use the 6e grade.
• 8g/7H: concrete formwork, temporary scaffolding, single-use applications, torque coefficient K allowed 0.18–0.28.
4. Unified Thread comparison (UNC/UNF)
• 3A/3B: tolerances equivalent to ISO 4h/4H, used in aerospace fasteners, pitch-diameter tolerance only 0.13 mm (1/4-20).
• 3A/3B: tolerances equivalent to ISO 4h/4H, used in aerospace fasteners, pitch-diameter tolerance only 0.13 mm (1/4-20).
• 2A/2B: equivalent to 6g/6H, dominant in the North-American market.
• 1A/1B: pitch-diameter tolerance relaxed by 50 %, used for rapid assembly in agricultural machinery; when converted to metric, it is close to the 8g grade of M3 Stainless Steel 304 Stud Bolt.
Conclusion: the accuracy grade determines fit tightness and cost. Precision grades (4h/4H) serve high-sealing, high-fatigue applications; conventional grades (6g/6H) balance performance and economy; enlarged grades (6e/8g) solve thick-coating or low-requirement scenarios. Regardless of size, M3 Stainless Steel 304 Stud Bolt can always find an optimum solution within the above system, achieving a precise match between performance and cost.
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