Name: HEX CAP SCREW OR BOLT DIN931Description :A cap screw made from medium carbon steel and heat-treated and stainless steel A2 and A4
Applications or Advantages: Has greater tensile strength than a Grade-2 or Grade-5 orGrade-8 Yield-to-tensile ratio is the lowest of all heat treated steels.
Length of a cap screw is measured from the underhead bearing surface to the extreme end of the screw.
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ASME |
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Nominal or |
E |
F |
G |
H |
J |
LT |
Y |
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Body |
Width Across Flats |
Width Across |
Head Height |
Wrenching |
Thread Length |
Transition |
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For Screw |
For Screw |
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Max |
Min |
Basic |
Max |
Min |
Max |
Min |
Basic |
Max |
Min |
Min |
Ref |
Ref |
Max |
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1/4 |
0.2500 |
0.2500 |
0.2450 |
7/16 |
0.438 |
0.428 |
0.505 |
0.488 |
5/32 |
0.163 |
0.150 |
0.106 |
0.750 |
1.000 |
0.250 |
|
5/16 |
0.3125 |
0.3125 |
0.3065 |
1/2 |
0.500 |
0.489 |
0.577 |
0.557 |
13/64 |
0.211 |
0.195 |
0.140 |
0.875 |
1.125 |
0.278 |
|
3/8 |
0.3750 |
0.3750 |
0.3690 |
9/16 |
0.562 |
0.551 |
0.650 |
0.628 |
15/64 |
0.243 |
0.226 |
0.160 |
1.000 |
1.250 |
0.312 |
|
7/16 |
0.4375 |
0.4375 |
0.4305 |
5/8 |
0.625 |
0.612 |
0.722 |
0.698 |
9/32 |
0.291 |
0.272 |
0.195 |
1.125 |
1.375 |
0.357 |
|
1/2 |
0.5000 |
0.5000 |
0.4930 |
3/4 |
0.750 |
0.736 |
0.866 |
0.840 |
5/16 |
0.323 |
0.302 |
0.215 |
1.250 |
1.500 |
0.385 |
|
9/16 |
0.5625 |
0.5625 |
0.5545 |
13/16 |
0.812 |
0.798 |
0.938 |
0.910 |
23/64 |
0.371 |
0.348 |
0.250 |
1.375 |
1.625 |
0.417 |
|
5/8 |
0.6250 |
0.6250 |
0.6170 |
15/16 |
0.938 |
0.922 |
1.083 |
1.051 |
25/64 |
0.403 |
0.378 |
0.269 |
1.500 |
1.750 |
0.455 |
|
3/4 |
0.7500 |
0.7500 |
0.7410 |
1-1/8 |
1.125 |
1.100 |
1.299 |
1.254 |
15/32 |
0.483 |
0.455 |
0.324 |
1.750 |
2.000 |
0.500 |
|
7/8 |
0.8750 |
0.8750 |
0.8660 |
1-5/16 |
1.312 |
1.285 |
1.516 |
1.465 |
35/64 |
0.563 |
0.531 |
0.378 |
2.000 |
2.250 |
0.556 |
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1 |
1.0000 |
1.0000 |
0.9900 |
1-1/2 |
1.500 |
1.469 |
1.732 |
1.675 |
39/64 |
0.627 |
0.591 |
0.416 |
2.250 |
2.500 |
0.625 |
|
1-1/8 |
1.1250 |
1.1250 |
1.1140 |
1-11/16 |
1.688 |
1.631 |
1.949 |
1.859 |
11/16 |
0.718 |
0.658 |
0.461 |
2.500 |
2.750 |
0.714 |
|
1-1/4 |
1.2500 |
1.2500 |
1.2390 |
1-7/8 |
1.875 |
1.812 |
2.165 |
2.066 |
25/32 |
0.813 |
0.749 |
0.530 |
2.750 |
3.000 |
0.714 |
|
1-1/2 |
1.5000 |
1.5000 |
1.4880 |
2-1/4 |
2.250 |
2.175 |
2.598 |
2.480 |
1-5/16 |
0.974 |
0.902 |
0.640 |
3.250 |
3.500 |
0.833 |
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Tolerance on Length |
Nominal Screw |
Nominal Screw Length |
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Up to 1 in., incl. |
Over 1 in. to |
Over 2-1/2 in. to |
Over 4 in. to 6 in., incl. |
Longer than 6 in. |
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1/4 to 3/8 |
-0.03 |
-0.04 |
-0.06 |
-0.10 |
-0.18 |
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7/16 and 1/2 |
-0.03 |
-0.06 |
-0.08 |
-0.10 |
-0.18 |
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9/16 to 3/4 |
-0.03 |
-0.08 |
-0.10 |
-0.10 |
-0.18 |
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7/8 and 1 |
.... |
-0.10 |
-0.14 |
-0.16 |
-0.20 |
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1-1/8 to 1-1/2 |
.... |
-0.12 |
-0.16 |
-0.18 |
-0.22 |
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GRADE-5 HEX CAP SCREW
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Description |
A cap screw made from medium carbon steel and heat-treated. |
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Applications steels. |
Has greater tensile strength than a Grade-2. Yield-to-tensile ratio is the lowest of all heat treated |
|
Heat Treatment |
Grade-5 cap screws shall be heat treated, oil or water quenched, at the option of the manufacturer, and tempered at a minimum tempering temperature of 800°F. |
|
Material |
Medium carbon steel. Use of an alloy steel is also acceptable. |
|
Core Hardness |
1/4 through 1 in. diameter, all lengths: Rockwell C25 - C34. 1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell C19 - C30. |
|
Surface Hardness |
1/4 through 1 in. diameter, all lengths: Rockwell 30N54 maximum. 1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell 30N50 maximum. |
|
Proof Load |
1/4 through 1 in. diameter, all lengths: 85,000 psi. 1-1/8 through 1-1/2 in. diameter, all lengths: 74,000 psi. |
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Yield Strength* |
1/4 through 1 in. diameter, all lengths: 92,000 psi. minimum 1-1/8 through 1-1/2 in. diameter, all lengths: 81,000 psi. minimum |
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Tensile Strength |
1/4 through 1 in. diameter, all lengths: 120,000 psi. minimum 1-1/8 through 1-1/2 in. diameter, all lengths: 105,000 psi. minimum |
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Elongation* |
14% minimum (all diameters) |
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Reduction of Area* |
35% minimum (all sizes) |
GRADE-8 HEX CAP SCREW
|
Description |
A cap screw made from medium carbon alloy steel and heat-treated. |
|
Applications/ Advantages |
Has greater tensile strength than a Grade-5. Designed for use in high stress applications. See specifications below for more information on how the Grade-8 exceeds the strength of a Grade-5. |
|
Heat Treatment |
Grade-8 cap screws shall be heat-treated, oil-quenched and tempered at a minimum temperature of 800°F. |
|
Material |
Medium carbon alloy steel. Note: For diameters 1/4 through 7/16 inch, it is permissible to use AISI 1541 steel. |
|
Core Hardness |
1/4 through 1-1/2 in. diameter, all lengths: Rockwell C33 - C39. |
|
Surface Hardness |
1/4 through 1-1/2 in. diameter, all lengths: Rockwell 30N58.6 maximum. |
|
Proof Load |
1/4 through 1-1/2 in. diameter, all lengths: 120,000 psi. |
|
Yield Strength* |
1/4 through 1-1/2 in. diameter, all lengths: 130,000 psi. minimum |
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Tensile Strength |
1/4 through 1-1/2 in. diameter, all lengths: 150,000 psi. minimum |
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Elongation* |
12% minimum (all diameters) |
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Reduction of Area* |
35% minimum (all sizes) |
· These properties ar etested only on machined specimens when the testing machine cannot provide for full testing of the parts.
· Product standards require the manufacturer’s head marking to appear on the top of all cap screws1/4” diameter and larger. “X” represents on location such a marking may appear.
