AISI 4140TGP

Typical analysis

C	Mn	P	S	Si	Cr	Mo
0.38-0.43	0.75-1.00	max 0.035	max 0.04	0.15-0.35	0.80-1.10	0.15-0.25

Manufactured to ASTM A434-90A, CLASS BD. High strength 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. Motor shafts, camshafts, hydraulic shafts and similar applications where high-speed work necessitates straightness and accuracy along with the ability to be machined unsymmetrically with practically no danger of warping; bolts, pins, studs and so on.

Mechanical properties

	unit	1 - 1/2"	2 - 1/4"	4 - 1/2"
Tensile strength	PSI	155,300	150,900	140,700
Yield strength	PSI	132,600	133,600	116,700
Elongation	% in 2"	15	17	14
Reduction in area	%	57	54	49
Brinell hardness		321	321	288

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"	- 0.005"

Available in metric and imperial sizes.