 HIGH TENSILE ALLOY FASTENERS |
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We manufacture high tensile fastener’s (studs, hex head bolts, sq.hex head, foundation bolts, jack screws, jack bolts and hex heavy series nuts etc.) from alloy, stainless and carbon steel materials to various grades as per the sizes and specifications acc. to ASTM A 193 GR. B7/L7/B7M/B8/B16 & ASTM A 194 GR. 2H/2HM/4/7.
We have all the necessary gauges and tools available for maintaining the sizes and the quality of the material. We have a good capacity of producing goods for more than 80 mt per month. |
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| ASTM A193 B7 (Cr-Mo AISI 4140,4142,4145) |
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| This material is ccnsidered suitable for bolts to be used at temperature below 450ºC, with ia minimum effect on its structual strength during application at a high temperature. The material has the following chemical composition and physical properties |
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C |
Mn |
P |
S |
Si |
Cr |
Mo |
0.37 ~ 0.49 |
0.65 ~ 1.10 |
Max 0.035 |
Max 0.04 |
0.15 ~ 0.35 |
0.75 ~ 1.20 |
0.115 ~ 0.25 |
Dia |
Minimum Tempering Temperature |
Tensile Strength min Ksi |
Yield Strength min. 0.2% offset Ksi |
Elongation in 2" min.% |
Reduction of area min.% |
Hardness Max. |
2½" and under |
1.100 (593ºC) |
125 (860) |
105(720) |
16 |
50 |
max. 35HRC |
Over 2½" to 4" |
1.100 (593ºC) |
115 (795) |
95(665) |
16 |
50 |
max. 35HRC |
Over 4" to 7" |
1.100 (593ºC) |
100 (690) |
75(515) |
18 |
50 |
max. 29HRC |
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| ASTM A193 B7M (Cr-Mo AISI 4140,4142,4145) |
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C |
Mn |
P |
S |
Si |
Cr |
Mo |
0.37 ~ 0.49 |
0.65 ~ 1.10 |
Max 0.035 |
Max 0.04 |
0.15 ~ 0.35 |
0.75 ~ 1.20 |
0.115 ~ 0.25 |
Dia |
Minimum Tempering Temperature F |
Tensile Strength min Ksi |
Yield Strength min. 0.2% offset Ksi |
Elongation in 2" min.% |
Reduction of area min.% |
Hardness Max. |
2½" and under |
1.150 (620ºC) |
105 (690) |
80(550) |
18 |
50 |
235HB 99HBB |
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| ASTM A194 Gr.2H |
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| This is the nut material for bolts made from ASTM A-193 B7, considered to be used with suitable heat treatment.
The chemical composition and physical properties are as follows: |
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C |
Mn |
P |
S |
Si |
Brinell Hardness |
Rockwell hardness |
min. 0.40 |
max. 1.00 |
max. 0.040 |
max. 0.050 |
max. 0.40 |
To 1½" 248 to 352 |
C 24 to 38 |
over 1½" 212 to 352 |
C max. 38, Bmin 95 |
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| ASTM A194 Gr.2HM |
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C |
Mn |
P |
S |
Si |
Brinell Hardness |
Rockwell hardness |
min. 0.40 |
max. 1.00 |
max. 0.040 |
max. 0.050 |
max. 0.40 |
159 to 237 |
C max 22 |
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