Clevis Pins (ISO 2341 / DIN 1444) manufactured in A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80) are dimensioned to ISO 2341. 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 Clevis Pins (ISO 2341 / DIN 1444)
Specified for marine, coastal and chemical applications. For clevis pins (iso 2341 / din 1444), 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 Clevis Pins (ISO 2341 / DIN 1444) in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Clevis Pins (ISO 2341 / DIN 1444), the alternative stainless grade is A2 (304). The practical dividing line is chlorides: A2 (304) is fine until salt is involved, and A4 (316) exists for the cases where it is — coastal, marine and road-salt service. Neither reaches the strength of a plated class 8.8 or 10.9 fastener.
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 Clevis Pins (ISO 2341 / DIN 1444) Available in A4 Stainless Steel
| Pin diameter d (mm) | Grip length (mm) | Head diameter (mm) | Head height (mm) | Cross hole diameter (mm) | Split pin size | Material | Reference standard |
|---|---|---|---|---|---|---|---|
| 4 | 12 | 7 | 2.5 | 1.6 | 1.6 x 16 | Steel 4.6 / A2 | ISO 2341 |
| 5 | 16 | 9 | 3.0 | 1.6 | 1.6 x 20 | Steel 4.6 / A2 | ISO 2341 |
| 6 | 20 | 10 | 3.5 | 2.0 | 2 x 20 | Steel 4.6 / A2 | ISO 2341 |
| 8 | 25 | 14 | 4.0 | 2.5 | 2.5 x 25 | Steel 4.6 / A2 | ISO 2341 |
| 10 | 32 | 18 | 4.5 | 3.2 | 3.2 x 32 | Steel 4.6 / A2 | ISO 2341 |
| 12 | 40 | 20 | 5.5 | 3.2 | 3.2 x 36 | Steel 4.6 | ISO 2341 |
| 16 | 50 | 27 | 7.0 | 4.0 | 4 x 40 | Steel 4.6 | ISO 2341 |
