Material page for pocket-hole screws in A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80). The sizes below are the ones we supply; there is no published dimensional standard for this article, so the table rather than a standard number is what to quote. Corrosion behaviour is superior, including marine and chloride environments and the service range is approx. -200 °C to +400 °C, subject to the property class and the joint.
Why Choose A4 Stainless Steel for Pocket-Hole Screws
Specified for marine, coastal and chemical applications. For pocket-hole 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 Pocket-Hole Screws in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Pocket-Hole Screws, the alternative stainless grade is A2 (304). Choose A2 (304) for general use and A4 (316) wherever chlorides are present; the molybdenum in A4 is the whole difference. Remember that stainless is the corrosion answer, not the strength answer — for load, look at class 8.8 or 10.9 instead.
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 Pocket-Hole Screws Available in A4 Stainless Steel
| Length (mm) | Thread | Head form | Material options | Point |
|---|---|---|---|---|
| 19 | coarse / fine | pan / Maxi-Loc | zinc-plated steel / stainless steel | self-tapping pocket-hole point |
| 25 | coarse / fine | pan / Maxi-Loc | zinc-plated steel / stainless steel | self-tapping pocket-hole point |
| 32 | coarse / fine | pan / Maxi-Loc | zinc-plated steel / stainless steel | self-tapping pocket-hole point |
| 38 | coarse / fine | pan / Maxi-Loc | zinc-plated steel / stainless steel | self-tapping pocket-hole point |
| 51 | coarse / fine | pan / Maxi-Loc | zinc-plated steel / stainless steel | self-tapping pocket-hole point |
| 64 | coarse / fine | pan / Maxi-Loc | zinc-plated steel / stainless steel | self-tapping pocket-hole point |
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. Head form and drive can be specified to the assembly rather than to a standard: a larger bearing face, a security drive, or a socket sized for the tool already on the bench. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
