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M4 DIN976 Stud Bolt
QS Fastener: M4 DIN976 Stud Bolt
Name: M4 DIN976 Stud Bolt
Standard: DIN976
Material: SS304
Size: M4
Lenght: 1000mm
Surface: Natural color
Standard: DIN976
Material: SS304
Size: M4
Lenght: 1000mm
Surface: Natural color
Quantity
M4 DIN976 Stud Bolt – cold-rolled from solid SS304 austenitic stainless steel, completely chip-free. Tensile strength ≥ 520 MPa, acid/alkali resistant, marine-grade rust-proof down to –40 °C. Overall length 1 000 mm, plain finish all over, no plating, zero hydrogen embrittlement, can be cut to any length on demand. Ideal for high-strength, highly-corrosive applications such as sanitary tubing, food machinery and solar racking. Mill test report supplied, neutral labelling and laser marking supported, ex-stock 24 h shipment.
Three tricks to spot a fake stainless-steel M4 DIN976 Stud Bolt in seconds
The market is flooded with counterfeits; one wrong material and your equipment “rusts out and goes on strike”. Master these three steps and you’ll turn into a “steel detective” in ten minutes.
The market is flooded with counterfeits; one wrong material and your equipment “rusts out and goes on strike”. Master these three steps and you’ll turn into a “steel detective” in ten minutes.
01 First visual filter: check the mark, the lustre, the burrs
- Mark: reputable makers laser- or stamp-mark “A2-70” or “SUS304” on the threaded end of the M4 DIN976 Stud Bolt; letters are sharp and evenly spaced. Fakes are blank or hand-stamped with uneven depth.
- Mark: reputable makers laser- or stamp-mark “A2-70” or “SUS304” on the threaded end of the M4 DIN976 Stud Bolt; letters are sharp and evenly spaced. Fakes are blank or hand-stamped with uneven depth.
- Lustre: 304 shows a soft “silvery mist”, like a brushed spoon; 201 or nickel-plated items glare “like a mirror”. Rotate the M4 DIN976 Stud Bolt under fluorescent light—if you catch a dazzling “light-bulb” flash, be alert.
- Burrs: genuine 304 is precision-rolled; thread crests are round and smooth. Fakes are cut, leaving knife-like edges that scratch. Run a fingernail along the thread—if it snags, it’s probably a counterfeit.
02 Drop-of-reagent test: one drop, instant answer
Buy a “304 stainless ID reagent” online (15 yuan, free shipping). Polish the end of the M4 DIN976 Stud Bolt (to remove any coating) and add one drop:
- 304: no colour change or slight grey within 3 s;
- 201: instant brick-red;
- 410: red + small bubbles.
Rinse with water afterwards to stop further attack.
Buy a “304 stainless ID reagent” online (15 yuan, free shipping). Polish the end of the M4 DIN976 Stud Bolt (to remove any coating) and add one drop:
- 304: no colour change or slight grey within 3 s;
- 201: instant brick-red;
- 410: red + small bubbles.
Rinse with water afterwards to stop further attack.
03 Kitchen salt-spray: can be done at home
Soak a sponge in strong brine, wrap the M4 DIN976 Stud Bolt, seal it in a zip-bag and leave 48 h at room temperature:
- Real 304: still bright, only fingerprint-like water stains;
- 201 / “fake stainless”: rust spots or reddish-brown “tear streaks”.
For faster results, boil the M4 DIN976 Stud Bolt 10 min, then brine-soak 12 h—any rust means fake.
Soak a sponge in strong brine, wrap the M4 DIN976 Stud Bolt, seal it in a zip-bag and leave 48 h at room temperature:
- Real 304: still bright, only fingerprint-like water stains;
- 201 / “fake stainless”: rust spots or reddish-brown “tear streaks”.
For faster results, boil the M4 DIN976 Stud Bolt 10 min, then brine-soak 12 h—any rust means fake.
04 Extra quick checks
- Magnet: cold-worked 304 M4 DIN976 Stud Bolt is slightly magnetic, but head, shank and tail show the same pull; fakes often have a strongly magnetic weld or tail that sticks to a fridge door.
- Magnet: cold-worked 304 M4 DIN976 Stud Bolt is slightly magnetic, but head, shank and tail show the same pull; fakes often have a strongly magnetic weld or tail that sticks to a fridge door.
- Weight: 100 pcs M4×30 M4 DIN976 Stud Bolt in 304 ≈ 820 g; in 201 only ≈ 780 g. Noticeably lighter means short-weight material.
- Sparks: gently grind a thread with an angle-grinder—short, forked sparks = 304; long, firework-like = high-carbon steel or 201.
Remember the rhyme: “First check the mark, then drop the reagent, brine it, magnet-scan it.” Run through these three moves and the true identity of the stainless-steel M4 DIN976 Stud Bolt is revealed—no more “rust assassins” sneaking onto your line.
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