Spring-loaded device material grades and descriptions as well as finish plating's are summarized in the tables and notations shown below:
| Material | Description | Key* |
|---|---|---|
| Stainless Steel | Good in corrosive environments food processing and high temperature applications (spring can withstand 600°F) Grades: 440C***, 300 Series per ASTM A-484 or ASTM A-582, 17-PH |
B,P,L,S |
| Carbon Steel | Less expensive material than stainless steel and better wear resistance of the plunger tip due to case hardening.** Grades: 11L17 or 12L14A or Ledloy AX |
B,P |
| Music Wire | Used on most carbon steel products. | S |
| Nylon or Delrin® | Will not mar soft material such as aluminum or brass. |
B,P,L |
| Phenolic | Will not mar soft material such as aluminum or brass. More brittle than nylon or Delrin. |
B,P |
Delrin® is a registered trademark of DuPont Corp.
*(B) Body • (P) Plunger • (L) Ball • (S) Spring
**NOTE: All steel plungers are typically case hardened to 0.15-.010 inches in depth to a hardness of between RC 58-62.
Finish Platings
| Material Grade | Tensile PSI | Yield PSI | Elong.* | Hardness** |
|---|---|---|---|---|
| 440C | 110,000 | 65,000 | 14 | Br230 |
| 302,304,304L | 65,000 | 35,000 | 80 | Br150 |
| 303S | 100,000 | 60,000 | 40 | Br228 |
| 316,316L | 80,000 | 35,000 | 55 | Br149 |
| 321,347 | 85,000 | 35,000 | 55 | Br150 |
| 12L14 | 80,000 | 60,000 | 10 | Rc B85 |
| LEDLOY AX | 80,000 | 60,000 | 10 | Rc B85 |
| 11L17 | 80,000 | 60,000 | 10 | Rc B85 |
* Elongation 2°, %
** Br = Brinell, Rc = Rockwell
*** Stainless steel components are passivated prior to assembly
| Material Grade | Max Temp°F | Max Temp°C | Hardness* |
|---|---|---|---|
| Music Wire | 250 | 121 | Rc C41-60 |
| 17-7PH | 650 | 343 | Rc C38-57 |
* Rc = Rockwell
| Material Description | Service Temperature°F | Tensile(1) | Ln. Exp.(2) | Hardness* |
|---|---|---|---|---|
| Delrin** | 195 | 9,000 | 5.0 | Rc M80-90 |
| Nylon | 180 | 12,000 | 4.5 | Rc R120 |
| Phenolic | 284 | 20,000 | - | Rm 110 |
(1) Yield Strength, PSI
(2) Linear Thermal Expansion IN/IN F°10(-5)
* Rc = Rockwell, Br = Brinell
** Acetal (Celcon, Delrin)