High Strength Steels
Mirraloy® FM TGP (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. Call or email us for a quote.
Features
Free Machining
Precision TGP Finish
Machine Straightened
Fatigue Resistant
Clean Steel Technology
Typical Properties*
| 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
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Available Sizes
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″
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Lengths
10/12 Ft. R/L, 20/24 Ft. R/L and Custom Cuts
Strength Comparison Chart (Based on 1/2″ Dia. Specimen)
| 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 |
*Small diameter shafts may have modified analysis and/or variations in thermal treatment.
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”) |
Applications
- Arbors
- Bolts
- Crank Shafts
- Drive Shafts
- Drag Line Parts
- Feed Screws
- Gears
- Hoist Shafts
- Hubs
- Journals
- King Bolts
- Lead Screws
- Line Shafts
- Mandrels
- Pinions
- Rings
- Stub Shafts
- Tie Rods
- Worm Gears
- Wrist Pins
Boxing is recommended to protect during shipment.
(Equivalent to Sheffield™ #20 FM)
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