Characteristics for Special Material Screws

Physical Properties

	Titanium	Hastelloy	Inconel	Nickel	Molybdenum	Phosphor Bronze	Aluminum
Specific Gravity	4.5	8.69	8.47	8.89	10.2	8.89	2.64
Longitudinal Elastic Modulus(N/mm²)	106.4×10³	206×10³	214×10³	204×10³	327×10³	110×10³	70×10³
Transverse Elastic Modulus(N/mm²)	－	－	80.8×10³	80.7×10³	121×10³	－	26×10³
Electric Resistance(μΩ/cm)	55	114(Room Temperature)	103(Room Temperature)	9.6(Room Temperature)	5.7(20°C)	－	－
Specific Heat(J/kg/K)	－	414(Room Temperature)	444(Room Temperature)	456(Room Temperature)	260(20°C)	－	－
Thermal Conductivity(W/(m·K))	17.16	10.1(48°C)	14.9(Room Temperature)	70.2(Room Temperature)	142.4(20°C)	70	110(25°C)
Linear Expansion Coefficient(K^-1)	8.4×10^-6	12.4×10^-6 (24°C~204°C)	13.8×10^-6 (21°C~204°C)	13.3×10^-6 (21°C~93°C)	5.2×10^-6 (100°C)	17.6×10^-6	24×10^-6

Mechanical Properties

	Titanium	Hastelloy	Inconel	Nickel	Molybdenum	Phosphor Bronze	Aluminum
Tensile Strength(N/mm²)	400(0°C)	800	670	450	550	590~685	294
0.2%Proof Stress(N/mm²)	－	405	370	240	－	－	245
Elongation(％)	38(0°C)	57	36	43	2.9	8~	12
Hardness	－	93(HRB)	87(HRB)	72(HRB)	95(HRB)	180~230(HB)	98(HB)

●The numerical values listed above are for reference only; they are not guaranteed under performance conditions.

Tensional Breaking Force of Special Material Screws (N)

	Titanium*	Hastelloy	Inconel	Nickel	Molybdenum	Phosphor Bronze	Aluminum
M3	3210	4020	2760	2110	3720	3370	1650
M4	5610	7020	4820	3680	6490	5880	2890
M5	9080	11300	7810	5960	10500	9510	4680
M6	12800	16000	11000	8440	14800	13400	6630
M8	23400	29200	20100	15300	27000	24500	12000
M10	37100	46400	31900	24300	42900	－	－
M12	53900	－	－	－	－	－	－

●The numerical values listed above are for reference only; they are not guaranteed under performance conditions.
*The values are for Titanium Socket Head Cap Screws SNST .

Tensional Breaking Torque Special Material Screws (N/m)

	Titanium*	Ceramic
M3	1.5	0.6
M4	3.4	0.8
M5	7.1	1.3
M6	12	2
M8	29	4
M10	59	5
M12	103	－

●The numerical values listed above are for reference only; they are not guaranteed under performance conditions.
*These values are for Titanium Socket Head Cap screws SNST .

Magnetic Flux Density of Titanium Screws and Phosphor Bronze Screws

	Titanium^*	Phosphor Bronze^*	SUSXM7 (SUS304 Equivalent)
Magnetic Flux Density (T)	0	0	5×10^-5

Measuring Device: FW Bell 5080 Gauss/Tesla Meter
Measuring conditions: DC Magnetic Measuring Field 5mm distance between the probe and the sample

Chemical Resistance

Chemical Names	Composition (%)	Titanium
Hydrochloric Acid	10	B
Hydrochloric Acid	30	D
Sulfuric Acid	10	C
Sulfuric Acid	50	D
Nitric Acid	10	A
Nitric Acid	50	A
Nitrohydrochloric Aid (HCl:HNO³)	3:1	A
Chromic Acid	5	A
Hydrofluoric Acid	5	D
Phosphoric Acid	50	C
Ferric Chloride	10~30	A
Cupric Chloride	10~30	B
Sodium Chloride	10~40	A
Calcium Chloride	50	A
Ammonium Chloride	40	A
Magnesium Chloride	40	A
Ferrous Sulfate	10~50	A
Ammonia	10~30	A
Sodium Hydroxide	50	A
Sodium Carbonate	10	A
Hydrogen Sulfide	Dry Gas	A
Hydrogen Sulfide	Wet Gas	A
Chlorine	Dry Gas	D
Chlorine	Wet Gas	A
Sulfur Dioxide	Dry/Wet Gas	A
Seawater	High Speed Stream	A
Formic Acid	10~50	B
Lactic Acid	50	A
Oxalic Acid	20	D
Citric Acid	10~50	A

Testing Temperature: Room Temperature
A：<0.127 mm/year
B：0.127~0.508 mm/year
C：0.508~1.27 mm/year
D：>1.27 mm/year

Chemical Resistance for Hastelloy/Inconel/Nickel

Chemical Names	Temperature	Hastelloy	Inconel	Nickel
Dilute Sulfuric Acid	Room Temperature	AA	A	A
Dilute Sulfuric Acid	Boiling Point	A	D	D
Concentrate Sulfuric Acid	Room Temperature	AA	C	C
Concentrate Sulfuric Acid	Boiling Point	D	D	D
Dilute Hydrochloric Acid	Room Temperature	AA	B	A
Dilute Hydrochloric Acid	Boiling Point	D	D	D
Concentrate Hydrochloric Acid	Room Temperature	AA	D	D
Concentrate Hydrochloric Acid	Boiling Point	B	D	D
Dilute Nitric Acid	Room Temperature	AA	D	D
Dilute Nitric Acid	Boiling Point	AA	－	D
Concentrate Nitric Acid	Room Temperature	AA	A	D
Concentrate Nitric Acid	Boiling Point	D	－	D
Dilute Phosphoric Acid	Room Temperature	AA	AA	AA
Dilute Phosphoric Acid	Boiling Point	AA	－	D
Concentrate Phosphoric Acid	Room Temperature	AA	AA	AA
Concentrate Phosphoric Acid	Boiling Point	B	－	D
Sodium Hydroxide (Diluted)	Room Temperature	－	AA	AA
Sodium Hydroxide (Diluted)	Boiling Point	－	C	AA
Sodium Hydroxide (Concentrated)	Room Temperature	－	AA	AA
Sodium Hydroxide (Concentrated)	Boiling Point	－	C	AA

AA：Excellent
A ：Good
B ：Useable
C ：Useable under certain conditions
D ：Non Useable

Chemical Resistance for Ceramic Screws

Chemical Names	Temperature	Time	Ceramic
35% Hydrochloric Acid	Boiling	30 minutes	A
70% Sulfuric Acid	Boiling	30 minutes	A
98% Nitric Acid	Boiling	30 minutes	A
90% Phosphoric Acid	Boiling	30 minutes	B
60% Hydrofluoric Acid	20°C	24 hours	C
10% Potassium Hydroxide	80°C	7 Days	A
Potassium Hydroxide	500°C(Boiling)	24 hours	C
Sodium Hydroxide	500°C(Boiling)	24 hours	B
Sodium Carbonate	900°C(Boiling)	24 hours	B
Sodium Sulfate	1000°C(Boiling)	24 hours	A
Potassium Fluoride	90°C(Boiling)	4 hours	D

A : No Corrosion
B : Slight Corrosion
C : Moderate Corrosion
D : Heavy Corrosion