Hexalobular Socket Pan Head Screws manufactured in A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80) are dimensioned to ISO 14583. The sections below give the mechanical and physical properties of the grade, its behavior in corrosive and elevated-temperature service, and the full size table.
Why Choose A4 Stainless Steel for Hexalobular Socket Pan Head Screws
Specified for marine, coastal and chemical applications. For hexalobular socket pan head screws, this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80 |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Superior, including marine and chloride environments |
Corrosion Behavior in Service
A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Hexalobular Socket Pan Head Screws in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Hexalobular Socket Pan Head Screws, the alternative stainless grade is A2 (304). A2 (304) covers general indoor and outdoor service. A4 (316) adds molybdenum, which is what buys the chloride resistance for marine and de-icing-salt exposure. Where strength matters more than corrosion, plated alloy steel in class 8.8 or 10.9 is the swap to make.
Using Stainless Fasteners in Aluminum
Stainless steel is more noble than aluminum, so with an electrolyte present — rain, condensation, salt spray — the aluminum becomes the anode and corrodes at the joint. Area ratio decides how bad it gets: a small stainless fastener in a large aluminum section is normally acceptable, a large stainless fastener in thin aluminum is not. Where the joint gets wet, isolate the metals with a coated or nylon washer and a sealant, or specify an aluminum or coated fastener instead.
Sizes of Hexalobular Socket Pan Head Screws Available in A4 Stainless Steel
| Size | Pitch P (mm) | a_max (mm) | b_min (mm) | d_a_max (mm) | Head diameter dk (mm) | Head height k (mm) | r_min (mm) | rf (mm) | x_max (mm) | tt (mm) | t (mm) | A_ref (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M2 | 0.4 | 0.8 | 25 | 2.6 | 4 | 1.6 | 0.1 | 3.2 | 1 | T6 | 0.7 | 1.75 | 3~20 | ISO 14583 |
| M2.5 | 0.45 | 0.9 | 25 | 3.1 | 5 | 2.1 | 0.1 | 4 | 1.1 | T8 | 0.975 | 2.4 | 3~25 | ISO 14583 |
| M3 | 0.5 | 1 | 25 | 3.6 | 5.6 | 2.4 | 0.1 | 5 | 1.25 | T10 | 1.14 | 2.8 | 4~30 | ISO 14583 |
| (M3.5) | 0.6 | 1.2 | 38 | 4.1 | 7 | 2.6 | 0.1 | 6 | 1.5 | T15 | 1.2 | 3.35 | 5~35 | ISO 14583 |
| M4 | 0.7 | 1.4 | 38 | 4.7 | 8 | 3.1 | 0.2 | 6.5 | 1.75 | T20 | 1.465 | 3.95 | 5~40 | ISO 14583 |
| M5 | 0.8 | 1.6 | 38 | 5.7 | 9.5 | 3.7 | 0.2 | 8 | 2 | T25 | 1.715 | 4.5 | 6~50 | ISO 14583 |
| M6 | 1 | 2 | 38 | 6.8 | 12 | 4.6 | 0.25 | 10 | 2.5 | T30 | 2.22 | 5.6 | 8~60 | ISO 14583 |
| M8 | 1.25 | 2.5 | 38 | 9.2 | 16 | 6 | 0.4 | 13 | 3.2 | T45 | 2.985 | 7.95 | 10~60 | ISO 14583 |
| M10 | 1.5 | 3 | 38 | 11.2 | 20 | 7.5 | 0.4 | 16 | 3.8 | T50 | 3.82 | 8.95 | 12~60 | ISO 14583 |
Dimensions are independent of the material: every size above is available in A4 Stainless Steel.
Custom manufacturing · Made to drawing
Need this screw in a grade that is not listed?
A4 Stainless Steel is one of the grades the catalog describes. Lengths and thread lengths outside the standard table are the commonest request, followed by a drive the standard does not offer and a head marked with your own part number. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
