Jam Nuts (Thin Hex, Inch) manufactured in A2 Stainless Steel (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70) are dimensioned to ASME B18.2.2. 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 A2 Stainless Steel for Jam Nuts (Thin Hex, Inch)
The most common stainless group for indoor and general outdoor fasteners. For jam nuts (thin hex, inch), 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 Jam Nuts (Thin Hex, Inch) 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 Jam Nuts (Thin Hex, Inch), the alternative stainless grade is A4 (316). 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
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 Jam Nuts (Thin Hex, Inch) Available in A2 Stainless Steel
| Thread size | Across flats s (mm) | Across corners e (mm) | Nut height m (mm) | Across flats (in) | Nut height (in) | Reference standard |
|---|---|---|---|---|---|---|
| 1/4"-20 | 11.11 | 12.70 | 3.97 | 7/16 | 5/32 | ASME B18.2.2 |
| 5/16"-18 | 12.70 | 14.53 | 4.76 | 1/2 | 3/16 | ASME B18.2.2 |
| 3/8"-16 | 14.29 | 16.35 | 5.56 | 9/16 | 7/32 | ASME B18.2.2 |
| 7/16"-14 | 17.46 | 19.98 | 6.35 | 11/16 | 1/4 | ASME B18.2.2 |
| 1/2"-13 | 19.05 | 21.79 | 7.94 | 3/4 | 5/16 | ASME B18.2.2 |
| 9/16"-12 | 20.64 | 23.62 | 7.94 | 13/16 | 5/16 | ASME B18.2.2 |
| 5/8"-11 | 23.81 | 27.23 | 9.53 | 15/16 | 3/8 | ASME B18.2.2 |
| 3/4"-10 | 28.58 | 32.69 | 11.11 | 1-1/8 | 7/16 | ASME B18.2.2 |
| 7/8"-9 | 33.34 | 38.14 | 12.70 | 1-5/16 | 1/2 | ASME B18.2.2 |
| 1"-8 | 38.10 | 43.59 | 14.29 | 1-1/2 | 9/16 | ASME B18.2.2 |
| 1-1/8"-7 | 42.86 | 49.04 | 15.88 | 1-11/16 | 5/8 | ASME B18.2.2 |
| 1-1/4"-7 | 47.63 | 54.48 | 17.46 | 1-7/8 | 11/16 | ASME B18.2.2 |
Dimensions are independent of the material: every size above is available in A2 Stainless Steel.
Custom manufacturing · Made to drawing
Need this nut in a grade that is not listed?
A2 Stainless Steel is one of the grades the catalog describes. Thread size is the obvious variable and rarely the interesting one — height for clearance, across-flats for the tool already in the cell, and the locking feature for the vibration actually present. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
