Material page for miniature captive pan-head screws in A2 Stainless Steel (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70). 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 good general corrosion resistance and the service range is approx. -200 °C to +400 °C, subject to the property class and the joint.
Why Choose A2 Stainless Steel for Miniature Captive Pan-Head Screws
The most common stainless group for indoor and general outdoor fasteners. For miniature captive pan-head screws, this matters when good general corrosion resistance is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70 |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Good general corrosion resistance |
Corrosion Behavior in Service
A2 (304) gives excellent atmospheric and most-water corrosion resistance and is the most common stainless for Miniature Captive Pan-Head Screws in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).
Comparable Grades
For Miniature Captive Pan-Head Screws, the alternative stainless grade is A4 (316). 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 Miniature Captive Pan-Head Screws Available in A2 Stainless Steel
| Thread size | Length options (mm) | Head diameter (mm) | Captive length (mm) | Under-head length (mm) | Maximum torque (N·m) |
|---|---|---|---|---|---|
| M1.4 | 4 / 5 / 6 / 8 / 10 | 2.0 | 2.0 | 0.5 | 0.03 |
| M1.6 | 4 / 5 / 6 / 8 / 10 | ||||
| M1.7 | 4 / 5 / 6 / 8 / 10 | ||||
| M2.0 | 4 / 5 / 6 / 8 / 10 | ||||
| M2.5 | 4 / 5 / 6 / 8 / 10 | ||||
| M2.6 | 4 / 5 / 6 / 8 / 10 | 4.0 | 1.8 | 0.16 |
Dimensions are independent of the material: every size above is available in A2 Stainless Steel.
Custom manufacturing · Made to drawing
Need this screw in a grade that is not listed?
A2 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.
