Product Overview
ASME B1.20.1 ASTM A351 Stainless Steel Hexagon Head Threaded Plugs are precision casting screw fittings engineered for high dimensional accuracy, superior surface finish, and complex geometries. These industrial-grade components are essential in applications requiring tight tolerances and premium finishes across aerospace, automotive, medical, and semiconductor manufacturing sectors.
Technical Specifications
| Product Name |
ASME B1.20.1 ASTM A351 Stainless Steel Hexagon Head Threaded Plug |
| Thread Types |
ASME B1.20.1 (NPT), BS 21 (NSPT), DIN2999/259 |
| Dimensions |
ISO 49-1994(E), MSS SP-114, ANSI B16.3 |
| Size Range |
1/8" to 4" |
| Pressure Class |
Class 150, 1000, 2000, 3000, 6000 and 9000 |
| Materials |
ASTM A351 (CF8, CF8M), JIS (SCS13, SCS14), AISI (304/L, 316/L), ASTM A182/A276 (304/L, 316/L) |
ASTM A351 CF8 & CF8M Material Properties
ASTM A351 CF8 and CF8M are austenitic stainless steel grades offering excellent strength and ductility. These materials are widely utilized in pump and valve systems, marine equipment, chemical processing, and food processing industries, with CF8 also serving nuclear and defense applications.
Chemical Composition (%)
| Grade |
C |
Mn |
Cr |
Mo |
Ni |
Fe |
Cu |
| CF8 |
0-0.08 |
0-1.5 |
18-21 |
0-0.5 |
9-11 |
Bal |
0.00-0.00 |
| CF8M |
0-0.08 |
0-1.5 |
18-21 |
2-3 |
9-12 |
Bal |
0.00-0.00 |
Mechanical Properties
| Grade |
Tensile Strength (ksi) |
Yield Strength (ksi) |
Elongation (%) |
Hardness (Brinell) |
| CF8 |
0.00-70 |
30 |
35 |
134-196 |
| CF8M |
0.00-70 |
30 |
30 |
146-212 |
ISO 49-1994(E) Dimensions
![ISO 49-1994(E) dimensional chart for stainless steel caps and plugs showing T1, T8, T9, T11 measurements]()
| Fitting Sizes (inch) |
T1 |
T8 |
T9 |
T11 |
a min (mm) |
b min (mm) |
c min (mm) |
d min (mm) |
| 1/8 |
1/8 |
1/8 |
-- |
13 |
11 |
20 |
-- |
| 1/4 |
1/4 |
1/4 |
-- |
15 |
14 |
22 |
-- |
| 3/8 |
3/8 |
3/8 |
3/8 |
17 |
15 |
24 |
11 |
| 1/2 |
1/2 |
1/2 |
1/2 |
19 |
18 |
26 |
15 |
| 3/4 |
3/4 |
3/4 |
3/4 |
22 |
20 |
32 |
16 |
| 1 |
1 |
1 |
1 |
24 |
23 |
36 |
19 |
| 1 1/4 |
1 1/4 |
1 1/4 |
-- |
27 |
29 |
39 |
-- |
| 1 1/2 |
1 1/2 |
1 1/2 |
-- |
27 |
30 |
41 |
-- |
| 2 |
2 |
2 |
-- |
32 |
36 |
48 |
-- |
| 2 1/2 |
2 1/2 |
2 1/2 |
-- |
35 |
39 |
54 |
-- |
| 3 |
3 |
3 |
-- |
38 |
44 |
60 |
-- |
| 4 |
4 |
4 |
-- |
45 |
58 |
70 |
-- |
Key Benefits
- Superior Corrosion Resistance & High Strength: Enables reduced wall thickness and weight while maintaining capability to withstand high flow rates and long-term environmental exposure
- Drinking Water Safe: Excellent resistance to all types of water including potable water with various chloride levels, plus full recyclability with high scrap value
- Low Maintenance & Long Lifespan: No additional coating required, with expected service life exceeding 50 years in both indoor and outdoor applications
- Cost-Effective Production: Affordable manufacturing for both high-volume and small-batch orders
