Mirraloy® FM TGP (1144 Mod)
1144 Mod Free Machining, TGP Shaft
Mirraloy FM is a modified 1144 steel. It is a high strength micro-alloyed, free machining carbon steel with a typical hardness of 260 BHN and typical tensile strength of 133,000 PSI. This material offers a high degree of machinability, like a carbon steel, and has the strength consistent with an alloy steel. It does not exhibit hard and/or soft spots like what is seen in most carbon steels. It is designed for ease of machining with high speed automatic equipment, such as screw machinery.
Mirraloy FM exhibits up to 50% more strength than that of an AISI 1018 carbon steel. Its high sulfur content gives this grade a machinability rating of 83% as compared to 1212 steel; welding is not recommended. It is an excellent choice for machined parts requiring better tensile strength and wear resistance than AISI 1045 or 1018. This is a “near” bearing-fit shaft with a precision finish of approximately RMS 15.
Features
| Hardness | 260 BHN |
| Tensile | 133,000 P.S.I. |
| Yield | 110,000 P.S.I. |
| Elongation in 2″ | 8% min. |
| Machinability | 83% of 1212 |
*Based on 1/2″ test piece
- 1/4″
- 5/16″
- 3/8″
- 7/16″
- 1/2″
- 9/16″
- 5/8″
- 11/16″
- 3/4″
- 13/16″
- 7/8″
- 15/16″
- 1″
- 1-1/16″
- 1-1/8″
- 1-3/16″
- 1-1/4″
- 1-5/16″
- 1-3/8″
- 1-7/16″
- 1-1/2″
- 1-9/16″
- 1-5/8″
- 1-11/16″
- 1-3/4″
- 1-13/16″
- 1-7/8″
- 1-15/16″
- 2-1/16″
- 2-1/4″
- 2-5/16″
- 2-3/8″
- 2-7/16″
- 2-1/2″
- 2-9/16″
- 2-5/8″
- 2-11/16″
- 2-3/4″
- 2-13/16″
- 2-7/8″
- 2-15/16″
- 3″
- 3-1/16″
- 3-1/4″
- 3-5/16″
- 3-3/8″
- 3-7/16″
- 3-1/2″
- 3-9/16″
- 3-5/8″
- 3-11/16″
- 3-3/4″
- 3-7/8″
- 3-15/16″
- 4″
Lengths
10/12 Ft. R/L, 20/24 Ft. R/L and Custom Cuts
Strength Comparison Chart
| Mirraloy FM | C1045 | C1018 |
|
|---|---|---|---|
| Tensile Strength | 133,000 PSI | 91,000 PSI | 70,000 PSI |
| Yield Strength | 110,000 PSI | 77,000 PSI | 50,000 PSI |
Typical Diameter Tolerances
| 1/4” to 1-1/2” Round | (+.000”/-.001”) |
| Over 1-1/2” to 3” Round | (+.000”/-.002”) |
| Over 3” to 4” Round | (+.000”/-.003”) |
Boxing is recommended to protect during shipment.