Properties of Common Materials Used In Main Cap Manufacturing
Materials currently used by Pro-Gram Engineering are indicate by an ( * )
Material		SAE 1045*	SAE 4140*	1018 / 1020	6061 Aluminum	7075 Aluminum*	Grey Cast Iron Class 30	Nodular Iron	Titanium*
Tensile Strength	90,500	148,000	55,000	45,000	83,000	30,000	60,000	144,000
Coefficient of Thermal Expansion @ 212 - 750 deg F.	5.9 - 7.5	8 - 8.3 (@ 1000 - 1800 deg)	5.9 - 7.5	11.7 - 13.7	11.7 - 13.7	0 - 6	6.6 - 10.4	4.3 - 7.5 (@ 1000 - 1800 deg)
Hardness in bhn	197	302	101	95	150	100 - 120	150	320 - 380