AISI 1045TGP

Typical analysis

C	Mn	P	S	Si
0.43 - 0.50	0.60 - 0.90	max. 0.04	max. 0.05	0.15 - 0.35

Precision ground shafting represents the highest degree of over-all accuracy, concentricity, straightness and surface perfection attainable in commercial practice. After being ground on a centreless grinder, bars are polished to a surface finish of RMS 25 max.

Typical applications

All forms of close tolerance shafting. This product is also referred to as pump shafting, due to its high degree of straightness, that is so important in high-speed shafting applications. Precision shafting is also used for motor shafts, camshafts mill shafts and similar applications where high-speed work necessitates straightness and accuracy along with the ability to be machined not symmetrically with practically no danger of warping.

Mechanical properties

	unit	1"	3"	7"
Tensile strength	PSI	115,000	102,500	90,000
Yield strength	PSI	85,000	79,000	59,000
Elongation	% in 2"	19	17	18
Reduction in area	%	32	42	35
Brinell hardness		223	212	187

Machinability

Machinability rating is approximately 70% of AISI B-112. Average surface cutting speed is 95 to 105 feet per minute.

Shear strength

The ultimate shear strength is approximately 66% of the ultimate tensile strength.

Weldability

Due to high carbon content, this material is not readily welded. With thin sections and flexible design, gas or arc welding may be used without preheating, but in joints over 1/4" to 3/4" thick, preheating is necessary. To develop equivalent strength in a weld, a low alloy filler is recommended. The grade of welding rod to be used depends on thickness of section, design, service requirements and so on.

Size tolerance

Diameter	Tolerances
1 - 1/2" and under	- 0.001"
>1 - 1/2" to 2 - 1/2"	- 0.0015"
>2 - 1/2" to 3"	- 0.002"
>3" to 4"	- 0.003"
>4" to 6"	- 0.005"
>6" to 7"	- 0.006"

Available in metric and imperial sizes.