Material page for hex standoffs, female-female 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 Hex Standoffs, Female-Female
Specified for marine, coastal and chemical applications. For hex standoffs, female-female, 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 Hex Standoffs, Female-Female in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Hex Standoffs, Female-Female, 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
Expect the aluminum to corrode, not the fastener — stainless sits higher in the galvanic series, so the aluminum is the one that gives up material. A small fastener in a thick section spreads the loss over a large area and is usually fine; a large fastener in thin sheet concentrates it and is not. Keep water out of the joint, or isolate the two metals with a nylon or coated washer and a sealant.
Sizes of Hex Standoffs, Female-Female Available in A4 Stainless Steel
| Thread size | Pitch (mm) | Across flats s (mm) | Across corners e (mm) | Length range L (mm) | Thread depth each end (mm) | Reference standard |
|---|---|---|---|---|---|---|
| M2.5 | 0.45 | 5 | 5.8 | 5~40 | 5 | Industry standard |
| M3 | 0.5 | 5.5 | 6.4 | 5~50 | 6 | Industry standard |
| M4 | 0.7 | 7 | 8.1 | 6~60 | 8 | Industry standard |
| M5 | 0.8 | 8 | 9.2 | 8~80 | 10 | Industry standard |
| M6 | 1.0 | 10 | 11.5 | 10~100 | 12 | Industry standard |
| M8 | 1.25 | 13 | 15.0 | 12~100 | 16 | Industry standard |
| M10 | 1.5 | 17 | 19.6 | 15~100 | 20 | Industry standard |
Dimensions are independent of the material: every size above is available in A4 Stainless Steel.
Custom manufacturing · Made to drawing
Need this standoff & spacer in a grade that is not listed?
A4 Stainless Steel is one of the grades the catalog describes. Dimensions, material, finish and form are specified from the drawing — a standoff & spacer outside the standard range is a variation on existing tooling rather than a new design. Made by tapping or turning.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
