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M4 SS304 Sunk Screw
QS Fastener: M4 SS304 Sunk Screw
Name: M4 SS304 Sunk Screw
Standard: DIN7991
Material: SS304
Size: M4
Lenght: 10 mm
Surface: Natural color
Standard: DIN7991
Material: SS304
Size: M4
Lenght: 10 mm
Surface: Natural color
Quantity
M4 SS304 Sunk Screw, made to DIN 7991 countersunk cup-head standard, is cut from premium SS304 austenitic stainless-steel wire, 10 mm long, natural finish, free of burrs or tool marks, visually minimal. Strength class A2-70, tensile ≥ 700 MPa, 1 000 h neutral-salt-spray, no rust spots. Mobile-phone frames, yacht decks, medical trolleys—wherever an “invisible + weather-proof” joint is needed, one turn and it is fixed for life.
Manufacturing a countersunk bolt is the superposition of “cold-forming art” and micrometre precision. Taking M4 SS304 Sunk Screw as the example: mill wire rod is spheroidised to ≥ 90 % globular pearlite, laying the foundation for heavy deformation; mechanical descaling → oxalic coating → borax soap cuts surface roughness to Ra ≤ 0.8 µm and the friction coefficient to 0.04, so metal flows “like liquid” during cold heading. A five-station high-speed former finishes in one stroke: blank-length tolerance ±0.05 mm; station 1 pre-forges the shank, station 2 creates the 90° cone, station 3 trims the 82° countersink and simultaneously extrudes the H2 cross-recess, station 4 sizes the flange, station 5 punches off the flash—metal fibre in the head follows the cone without interruption, raising torque capacity by 18 %. The M4 SS304 Sunk Screw then enters the “shank-reduction + thread-rolling” cell: the shank is cold-squeezed 0.15 mm smaller, grains elongate and harden, surface hardness rises from 180 HV to 280 HV; a high-speed roller then forms 4 h6 threads at 120 m/min, flank roughness ≤ 1.6 µm, guaranteeing 100 % 6 H go/no-go acceptance. To erase cold-work stress, a continuous mesh-belt furnace tempers 45 min at 650 °C under pure nitrogen—yield strength stays at 600 MPa while residual stress drops 70 %; 48 h cyclic salt-spray shows no red rust. The head cone is centreless-ground twice in through-feed mode, taper angle held to ±30′, contact area with the countersink ≥ 85 %, leaving a flush, step-free fit. Every part is 100 % vision-checked: head height, shank concentricity, pitch diameter monitored live by SPC, Cpk ≥ 1.67; laser-etched heat number and QR code give full-life traceability for each M4 SS304 Sunk Screw. From wire rod to finished part takes 8 s; one line outputs 120 000 pieces per day while keeping micrometre accuracy and aerospace-level consistency—this is why the modern M4 SS304 Sunk Screw can stay “invisible” in every assembly interface.
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