Lag Screws (Hex Wood Screws) manufactured in A4 Stainless Steel (A4-80 (316)) are dimensioned to DIN 571. 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 Lag Screws (Hex Wood Screws)
Specified for marine, coastal and chemical applications. For lag screws (hex wood screws), this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | A4-80 (316) |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C |
| 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 Lag Screws (Hex Wood Screws) in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Lag Screws (Hex Wood Screws), the alternative stainless grade is A2 (304). A2 (304) suits general indoor and outdoor service; A4 (316) adds molybdenum for marine and chloride environments. Where higher strength matters more than corrosion, switch to plated alloy-steel class 8.8 or 10.9.
Sizes of Lag Screws (Hex Wood Screws) Available in A4 Stainless Steel
| Nominal diameter (mm) | Pitch (mm) | Width across flats s (mm) | Head height k (mm) | Pilot/guide hole (mm) | Common length range (mm) | Reference standard | Notes |
|---|---|---|---|---|---|---|---|
| 5 | 2.0 | 8.0 | 3.5 | 3.0 | 25~100 | DIN 571 | Wood screw, self-tapping point |
| 6 | 2.5 | 10.0 | 4.0 | 4.0 | 30~150 | DIN 571 | Wood screw, self-tapping point |
| 8 | 3.0 | 13.0 | 5.5 | 5.0 | 40~200 | DIN 571 | Wood screw, self-tapping point |
| 10 | 3.5 | 16.0 | 6.5 | 7.0 | 50~250 | DIN 571 | Wood screw, self-tapping point |
| 12 | 4.0 | 18.0 | 7.5 | 8.5 | 60~300 | DIN 571 | Wood screw, self-tapping point |
| 14 | 4.0 | 21.0 | 9.0 | 10.0 | 60~300 | DIN 571 | Wood screw, self-tapping point |
| 16 | 4.5 | 24.0 | 10.0 | 11.5 | 80~300 | DIN 571 | Wood screw, self-tapping point |
| 18 | 5.0 | 27.0 | 11.5 | 13.0 | 80~300 | DIN 571 | Wood screw, self-tapping point |
| 20 | 5.0 | 30.0 | 12.5 | 14.5 | 100~300 | DIN 571 | Wood screw, self-tapping point |
| 22 | 5.5 | 32.0 | 14.0 | 16.0 | 100~300 | DIN 571 | Wood screw, self-tapping point |
| 24 | 6.0 | 36.0 | 15.0 | 17.5 | 100~300 | DIN 571 | Wood screw, self-tapping point |