A2 Stainless Steel (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70) is the most common stainless group for indoor and general outdoor fasteners. When trapezoidal (metric acme-type) threaded rod are specified in this grade, the dimensions remain per DIN 103; the material determines corrosion behavior (good general corrosion resistance) and the service temperature range (approx. -200 °C to +400 °C, subject to the property class and the joint). Both are covered below with the size table.
Why Choose A2 Stainless Steel for Trapezoidal (Metric ACME-Type) Threaded Rod
The most common stainless group for indoor and general outdoor fasteners. For trapezoidal (metric acme-type) threaded rod, 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 |
Galvanic & Galling Considerations
Two important notes for stainless trapezoidal (metric acme-type) threaded rod: (1) stainless can gall on stainless threads under load — use a thread lubricant or anti-galling compound, especially for M6 and below; (2) when joined to aluminum or galvanized steel, stainless can drive galvanic corrosion of the less-noble metal in wet service — isolate with a coating or sleeve where appropriate.
Comparable Grades
For Trapezoidal (Metric ACME-Type) Threaded Rod, 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 Trapezoidal (Metric ACME-Type) Threaded Rod Available in A2 Stainless Steel
| Size | Pitch P (mm) | Clearance ac (mm) | Reference standard |
|---|---|---|---|
| Tr8 | 1.5 | 0.15 | DIN 103 |
| Tr9 | 2 / 1.5 | DIN 103 | |
| Tr10 | 2 / 1.5 | DIN 103 | |
| Tr11 | 2 / 3 | DIN 103 | |
| Tr12 | 3 / 2 | DIN 103 | |
| Tr14 | 3 / 2 | DIN 103 | |
| Tr16 | 4 / 2 | DIN 103 | |
| Tr18 | 4 / 2 | DIN 103 | |
| Tr20 | 4 / 2 | DIN 103 | |
| Tr22 | 5 / 3 / 8 | DIN 103 | |
| Tr24 | 5 / 3 / 8 | DIN 103 | |
| Tr26 | 5 / 3 / 8 | DIN 103 | |
| Tr28 | 5 / 3 / 8 | DIN 103 | |
| Tr30 | 6 / 3 / 10 | DIN 103 | |
| Tr32 | 6 / 3 / 10 | DIN 103 | |
| Tr34 | 6 / 3 / 10 | DIN 103 | |
| Tr36 | 6 / 3 / 10 | DIN 103 | |
| Tr38 | 7 / 3 / 10 | DIN 103 | |
| Tr40 | 7 / 3 / 10 | DIN 103 | |
| Tr42 | 7 / 3 / 10 | DIN 103 | |
| Tr44 | 7 / 3 / 12 | DIN 103 | |
| Tr46 | 8 / 3 / 12 | DIN 103 | |
| Tr48 | 8 / 3 / 12 | DIN 103 | |
| Tr50 | 8 / 3 / 12 | DIN 103 | |
| Tr52 | 8 / 3 / 12 | DIN 103 | |
| Tr55 | 9 / 3 / 14 | DIN 103 | |
| Tr60 | 9 / 3 / 14 | DIN 103 | |
| Tr65 | 10 / 4 / 16 | DIN 103 | |
| Tr70 | 10 / 4 / 16 | DIN 103 | |
| Tr75 | 10 / 4 / 16 | DIN 103 |
Dimensions are independent of the material: every size above is available in A2 Stainless Steel.
Custom manufacturing · Made to drawing
Need this bolt in a grade that is not listed?
A2 Stainless Steel is one of the grades the catalog describes. Dimensions, material, finish and form are specified from the drawing — a bolt outside the standard range is a variation on existing tooling rather than a new design. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
