Stainless Steel Countersunk Socket Screw
Specification
Stainless Steel Countersunk Socket Screws | Metric Sizes
Keep panels, covers, and mating surfaces clear of protruding screw heads. PO JUN offers stainless steel countersunk socket screws in metric sizes M3–M16, with lengths from 6 to 100 mm depending on diameter.
Also known as stainless steel flat head socket screws, these fasteners combine a countersunk head with an internal hex drive. When paired with a correctly sized countersink, the head can sit flush with the assembly surface—useful for equipment housings, mounting plates, and components where clearance matters.
A Flush Profile for Close-Fitting Assemblies
Less Head Protrusion
The tapered head fits into a matching countersunk hole rather than sitting above the component. This helps keep fastening points out of the path of adjacent parts and gives exposed panels a more uniform appearance.
Hex Socket Installation
The internal hex drive accepts a matching hex key or driver bit, allowing installation from above the screw head. It is useful where side access for an external wrench is limited, provided sufficient clearance remains for the hex tool.
Stainless Steel Construction
Stainless steel offers an alternative to plated carbon-steel fasteners when material selection and corrosion exposure are important. Specify your required grade and service environment when ordering; suitability depends on the grade, surface condition, and exposure.
Stainless Steel Countersunk Socket Screw Specifications
Available Metric Sizes
All lengths below are in mm.
| Thread Diameter | Available Lengths (mm) |
|---|---|
| M3 | 6, 8, 10, 12, 16, 20, 25, 30 |
| M4 | 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50 |
| M5 | 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50 |
| M6 | 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100 |
| M8 | 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100 |
| M10 | 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100 |
| M12 | 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100 |
| M16 | 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100 |
Countersunk screw length is normally measured from the top of the head to the tip. Confirm the measurement basis, thread pitch, and thread length against your drawing before ordering.
Where Countersunk Socket Screws Fit Best
These screws are a practical choice when the fastening position needs a recessed head rather than an exposed cylindrical or hex head.
- Equipment covers and access panels: Keep screw heads close to the outer surface while retaining hex-key access for servicing.
- Mounting plates and brackets: Reduce head protrusion where another component sits against or passes over the fastening location.
- Machine guards and instrument housings: Combine removable fastening with a flat-head appearance on visible surfaces.
- Fixtures and assembly plates: Keep designated working surfaces clear where the plate has sufficient thickness for a countersink.
A flush result depends on matching the head angle and diameter to the countersink. For thin sheet or shallow mounting sections, check that the material can accommodate the head without excessive deformation.
Selecting the Right Screw
Start with the mating thread and the space available for the head. Diameter and length identify the basic size, while thread pitch, countersink geometry, and stainless steel grade determine whether it fits your assembly.
For replacement orders, a drawing or existing sample helps distinguish similar-looking screws with different head dimensions or thread lengths. If your project specifies a DIN or ISO standard, include its number so the required dimensions and material properties can be reviewed before quotation.
Request a Quote from PO JUN
Whether you are sourcing fasteners for equipment production or replacing an existing component, send PO JUN your diameter, length, thread pitch, stainless steel grade, and quantity.
Attach a drawing or sample details if available, and include the delivery country and requested delivery date. Any packaging, labeling, or material-document requirements can be added to the same inquiry for review.
Not sure which size matches your assembly? Send the mating-hole dimensions and a photo or drawing to start the discussion.
Frequently Asked Questions
Can these screws replace cylindrical socket head cap screws?
Not as a direct substitution. Countersunk screws need a matching tapered seat, whereas cylindrical socket head screws use a different bearing surface. The joint design and length measurement must be reviewed before changing head styles.
Can they cut their own threads?
No. These are machine-thread fasteners intended for matching tapped holes or nuts, not self-tapping or self-drilling screws.
Are all listed lengths fully threaded?
Thread coverage should be confirmed for the selected size. If your assembly requires a particular threaded length or an unthreaded section, mark it on the drawing.
How can I reduce stainless steel thread galling during assembly?
Use clean, undamaged mating threads and controlled installation speed. Where permitted, a suitable lubricant or anti-seize treatment may help, but tightening torque must account for the changed friction conditions.