A4 Stainless Steel Left-Hand Thread Hex Nuts are supplied to DIN 934. The grade provides superior, including marine and chloride environments and is largely non-magnetic; the practical service range is approx. -200 °C to +400 °C, subject to the property class and the joint. Property data, grade comparison and the full size table follow.
Why Choose A4 Stainless Steel for Left-Hand Thread Hex Nuts
Specified for marine, coastal and chemical applications. For left-hand thread hex nuts, 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 Left-Hand Thread Hex Nuts in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Galvanic & Galling Considerations
Two important notes for stainless left-hand thread hex nuts: (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.
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 Left-Hand Thread Hex Nuts Available in A4 Stainless Steel
| Thread size | Pitch (mm) | Across flats s (mm) | Across corners e (mm) | Nut height m (mm) | Thread direction | Reference standard |
|---|---|---|---|---|---|---|
| M6 | 1.0 | 10 | 11.05 | 5.0 | Left-hand | DIN 934 LH |
| M8 | 1.25 | 13 | 14.38 | 6.5 | Left-hand | DIN 934 LH |
| M10 | 1.5 | 17 | 18.90 | 8.0 | Left-hand | DIN 934 LH |
| M12 | 1.75 | 19 | 21.10 | 10.0 | Left-hand | DIN 934 LH |
| M16 | 2.0 | 24 | 26.75 | 13.0 | Left-hand | DIN 934 LH |
| M20 | 2.5 | 30 | 33.53 | 16.0 | Left-hand | DIN 934 LH |
| M24 | 3.0 | 36 | 39.98 | 19.0 | Left-hand | DIN 934 LH |
Dimensions are independent of the material: every size above is available in A4 Stainless Steel.
Custom manufacturing · Made to drawing
Need this nut in a grade that is not listed?
A4 Stainless Steel is one of the grades the catalog describes. Height and across-flats are the two most often changed — a thinner nut for clearance, a larger hex for a tool that is already on the line. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
