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Stainless Steel Cap Nut | Alloy Steel Cap Nut | Duplex Steel Cap Nut | Carbon Steel Cap Nut
Carbon Steel Cap Nut
Carbon and Alloy Steel Fastener as per A194
DimensionsFull Range of Fastener Products both Imperial & Metric. Dimensions range from M3 to M72 and quantities from 1 to 10,000.
| Hexagon Bolts / Set Screws | Stud Bolts | Hexagon Nuts | Socket Capscrews |
|---|---|---|---|
| DIN 931 | BS4882 | DIN 934 | DIN 912 |
| DIN 933 | DIN 976 | BS 1768 | DIN 6912 |
| BS 1768 | - | BS 1769 | DIN 7984 |
| UNI 5731 | - | BS 1083 | ANSI B18.3 |
| UNI 5739 | - | BS 3692 | ISO 4762 |
| ISO 4014 | - | ISO 4032 | UNI 5931 |
| ISO 4017 | - | ISO 4033 | BS 2470 |
| BS 1769 | - | ANSI B18.2.2 | BS 4168 |
| BS 3692 | - | - | - |
| ANSI B18.2.1 | - | - | - |
| Socket & Slotted Set Screws | Socket & Slotted Countersunk Screws | Studs | Washers |
|---|---|---|---|
| DIN 913 | DIN 963 | DIN 938 | DIN 125 |
| DIN 914 | DIN 7991 | DIN 939 | DIN 9021 |
| DIN 915 | BS 4168 | DIN 2510 | BS 4320 |
| DIN 916 | BS 1981 | BS 4439 | BS 3410 |
| DIN 551 | BS 483 | BS 2693 | - |
| DIN 553 | BS 2470 | - | Spring Washers |
| DIN 438 | - | - | DIN 127 |
| BS 4168 | - | - | BS 4464 |
| - | - | - | BS 1802 |
Carbon and Alloy Steel Carbon Steel Cap Nut
| IdentificationGrade Mark | Specification | FastenerDescription | Material | Nominal SizeRange (in.) | Mechanical Properties | ||
| Proof Load(psi) | Yield StrengthMin (psi) | Tensile StrengthMin (psi) | |||||
 NoGradeMark | SAE J429Grade 1 | Bolts,Screws,Studs | Low or Medium Carbon Steel | 1/4 thru 1-1/2 | 33,000 | 36,000 | 60,000 |
| ASTM A307Grades A&B | Low Carbon Steel | 1/4 thru 4 | — | — | |||
| SAE J429Grade 2 | Low or Medium Carbon Steel | 1/4 thru 3/4 Over 3/4 to 1-1/2 | 55,00033,000 | 57,00036,000 | 74,00060,000 | ||
| NoGradeMark | SAE J429Grade 4 | Studs | Medium Carbon Cold Drawn Steel | 1/4 thru 1-1/2 | — | 100,000 | 115,000 |
| B5 | ASTM A193Grade B5 | AISI 501 | 1/4 Thru 4 | — | 80,000 | 100,000 | |
| B6 | ASTM A193Grade B6 | AISI 410 | 85,000 | 110,000 | |||
| B7 | ASTM A193Grade B7 | AISI 4140, 4142, OR 4105 | 1/4 thru 2-1/2Over 2-1/2 thru 4Over 4 thru 7 | ——- | 105,00095,00075,000 | 125,000115,000100,000 | |
| B16 | ASTM A193Grade B16 | CrMoVa Alloy Steel | 105,00095,00085,000 | 125,000115,000100,000 | |||
| B8 | ASTM A193Grade B8 | AISI 304 | 1/4 and larger | — | 30,000 | 75,000 | |
| B8C | ASTM A193Grade B8C | AISI 347 | |||||
| B8M | ASTM A193Grade B8M | AISI 316 | |||||
| B8T | ASTM A193Grade B8T | Bolts,Screws,Studs for High-Temperature Service | AISI 321 | 1/4 and larger | — | 30,000 | 75,000 |
| B8 | ASTM A193Grade B8 | AISI 304Strain Hardened | 1/4 thr 3/4Over 3/4 thru 1Over 1 thru 1-1/4Over 1-1/4 thru 1-1/2 | ——— | 100,00080,00065,000 50,000 | 125,000115,000105,00 0100,000 | |
| B8C | ASTM A193Grade B8C | AISI 347Strain Hardened | |||||
| B8M | ASTM A193Grade B8M | AISI 316Strain Hardened | 95,00080,00065,000 50,000 | 110,000100,00095,00 090,000 | |||
| B8T | ASTM A193Grade B8T | AISI 321Strain Hardened | 100,00080,00065,000 50,000 | 125,000115,000105,000 100,000 | |||
| L7 | ASTM A320Grade L7 | Bolts,Screws,Studs for Low-Temperature Service | AISI 4140,4142 or 4145 | 1/4 thru 2-1/2 | — | 105,000 | 125,000 |
| L7A | ASTM A320Grade L7A | AISI 4037 | |||||
| L7B | ASTM A320Grade L7B | AISI 4137 | |||||
| L7C | ASTM A320Grade LC7 | AISI 8740 | |||||
| L43 | ASTM A320Grade L43 | AISI 4340 | 1/4 thru 4 | — | 105,000 | 125,000 | |
| B8 | ASTM A320Grade B8 | Bolts,Screws,Studs for Low-Temperature Service | AISI 304 | 1/4 and larger | — | 30,000 | 75,000 |
| B8C | ASTM A320Grade B8C | AISI 347 | |||||
| B8T | ASTM A320Grade B8T | AISI 321 | |||||
| B8F | ASTM A320Grade B8F | AISI 303or 303Se | |||||
| B8M | ASTM A320Grade B8M | AISI 316 | |||||
| B8 | ASTM A320Grade B8 | AISI 304 | 1/4 thru 3/4Over 3/4 thru 1Over 1 thru 1-1/4Over 1-1/4 thru 1-1/2 | ——— | 100,00080,00065,00 50,00 | 100,00080,00065,00 50,00 | |
| B8C | ASTM A320Grade B8C | AISI 347 | |||||
| B8F | ASTM A320Grade B8F | AISI 303or 303Se | |||||
| B8M | ASTM A320Grade B8M | AISI 316 | |||||
| B8T | ASTM A320Grade B8T | AISI 321 | |||||
 | SAE J429Grade 5 | Bolts,Screws,Studs | Medium Carbon Steel, Quenched and Tempered | 1/4 thru 1Over 1 to 1-1/2 | 85,00074,000 | 92,00081,000 | 120,000105,000 |
| ASTM A449 | 1/4 thru 1Over 1 to 1-1/2Over 1-1/2 thru 3 | 85,00074,000 55,000 | 92,00081,00058,000 | 120,000105,00090,000 | |||
 | SAE J429Grade 5.1 | Sems | Low or Medium Carbon Steel, Quenched and Tempered | No. 6thru 3/8 | 85,000 | — | 120,000 |
 | SAE J429Grade 5.2 | Bolts,Screws,Studs | Low Carbon Martensitic Steel, Quenched and Tempered | 1/4 thru 1 | 85,000 | 92,000 | 120,000 |
| A325 | ASTM A325Type 1 | High StrengthStructural Bolts | Medium Carbon Steel, Quenched and Tempered | 1/2 thru 11-1/8 thru 1-1/2 | 85,00074,000 | 92,00081,000 | 120,000105,000 |
| A325 | ASTM A325Type 2 | Low Carbon Martensitic Steel, Quenched and Tempered | 1/2 thru 1 | 85,000 | 92,000 | 120,000 | |
| A325 | ASTM A325Type 3 | Atmospheric Corrosion Resisting Steel, Quenched and Tempered | 1/2 thru 11-1/8 thru 1-1/2 | 85,00074,000 | 92,00081,000 | 120,000105,000 | |
 BB | ASTM A354Grade BB | Bolts,Studs | Alloy Steel, Quenched and Tempered | 1/4 thru 2-1/22-3/4 thru 4 | 80,00075,000 | 83,00078,000 | 105,000100,000 |
 BC | ASTM A354Grade BC | 105,00095,000 | 109,00099,000 | 125,000115,000 | |||
 | SAE J429Grade 7 | Bolts,Screws, | Medium Carbon Alloy Steel, Quenched and Tempered 4 | 1/4 thru 1-1/2 | 105,000 | 115,000 | 133,000 |
 | SAE J429Grade 8 | Bolts,Screws,Studs | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 thru 1-1/2 | 120,000 | 130,000 | 150,000 |
| ASTM A354Grade BD | Alloy Steel, Quenched and Tempered 4 | ||||||
| No GradeMark | SAE J429Grade 8.1 | Studs | Medium Carbon Alloy or SAE 1041 Modified Elevated Temperature Drawn Steel | 1/4 thru 1-1/2 | 120,000 | 130,000 | 150,000 |
| A490 | ASTM A490 | High Strength Structural Bolts | Alloy Steel, Quenched and Tempered | 1/2 thru 1-1/2 | 120,000 | 130,000 | 150,000 min170,000 max |
| No GradeMark | ISO R898Class 4.6 | Bolts,Screws,Studs | Medium Carbon Steel, Quenched and Tempered | All Sizesthru 1-1/2 | 33,000 | 36,000 | 60,000 |
| No GradeMark | ISO R898Class 5.8 | 55,000 | 57,000 | 74,000 | |||
| 8.8or88 | ISO R898Class 8.8 | Alloy Steel, Quenched and Tempered | 85,000 | 92,000 | 120,000 | ||
| 10.9or109 | ISO R898Class 10.9 | 120,000 | 130,000 | 150,000 | |||
FASTENER IDENTIFICATION MARKING
| GradeIdentificationMarking | Specification | Material | Nominal SizeIn. | ProofLoadStressksi | HardnessRockwell | SeeNote | |
| Min | Max | ||||||
 No Mark | ASTM A563 – Grade 0 | Carbon Steel | 1/4 thru 1-1/2 | 69 | B55 | C32 | 3,4 |
| ASTM A563 – Grade A | Carbon Steel | 1/4 thru 1-1/2 | 90 | B68 | C32 | 3,4 | |
| ASTM A563 – Grade B | Carbon Steel | 1/4 thru 1 | 120 | B69 | C32 | 3,4 | |
| over 1 thru 1-1/2 | 105 | ||||||
 | ASTM A563 – Grade C | Carbon SteelMay be Quenchedand Tampered | 1/4 thru 4 | 144 | B78 | C38 | 5 |
 | ASTM A563 – Grade C3 | AtmosphericCorrosionResistant SteelMay be Quenchedand Tampered | 1/4 thru 4 | 144 | B78 | C38 | 5,9 |
 | ASTM A563 – Grade D | Carbon SteelMay be Quenchedand Tampered | 1/4 thru 4 | 150 | B84 | C38 | 6 |
 | ASTM A563 – Grade DH | Carbon SteelQuenchedand Tampered | 1/4 thru 4 | 175 | C24 | C38 | 6 |
 | ASTM A563 – Grade DH3 | AtmosphericCorrosionResistant Steel,Quenchedand Tampered | 1/4 thru 4 | 175 | C24 | C38 | 5,9 |
 | ASTM A194 – Grade 1 | Carbon Steel | 1/4 thru 4 | 130 | B70 | — | 7 |
 | ASTM A194 – Grade 2 | Medium CarbonSteel | 1/4 thru 4 | 150 | 159 | 352 | 7,8 |
 | ASTM A194 – Grade 2H | Medium CarbonSteel, Quenchedand Tempered | 1/4 thru 4 | 175 | C24 | C38 | 7 |
 | ASTM A194 – Grade 2HM | Medium CarbonSteel, Quenchedand Tempered | 1/4 thru 4 | 150 | 159 | 237 | 7,8 |
 | ASTM A194 – Grade 4 | Medium CarbonAlloy Steel,Quenchedand Tempered | 1/4 thru 4 | 175 | C24 | C38 | 7 |
 | ASTM A194 – Grade 7 | Medium CarbonAlloy Steel,Quenchedand Tempered | 1/4 thru 4 | 175 | C24 | C38 | 7 |
 | ASTM A194 – Grade 7M | Medium CarbonAlloy Steel,Quenchedand Tempered | 1/4 thru 4 | 150 | 159 | 237 | 7 |
| See Note 1,2 | 10 | ||||||
NOTES:
- In addition to the indicated grade marking, all grades, except A563 grades O, A and B, must be marked for manufacturer identification.
- The markings shown for all grades of A194 nuts are for cold formed and hot forged nuts. When nuts are machined from bar stock the nut must be additionally marked with the letter ‘B’.
- Nuts are not required to be marked unless specified by the purchaser. When marked, the identification marking shall be the grade letter O, A or B.
- Properties shown are those of nonplated or noncoated coarse thread hex nuts.Properties shown are those of coarse thread heavy hex nuts.
- Properties shown are those of coarse thread heavy hex nuts.
- Properties shown are those of coarse 8-pitch thread heavy hex nuts.
- Hardnesses are Brinell Hardness Numbers.
- The nut manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel.
- Specifications —
- STM A563 — Carbon and Alloy Steel Nuts.
- ASTM A194/A194M — Carbon and Alloy Steel Nuts for Bolts
for High Pressure and High Temperature Service.
Cap Nuts 18-8 Stainless Steel
Typically manufactured from either low carbon steel or stainless steel, cap nuts, also referred to as acorn nuts are used to cover exposed bolt ends and add a finished appearance. ;These stainless steel cap nuts are composed of a hex nut and top cap consisting of 18% chromium and 8% nickel for corrosion resistance. Good for exterior and most marine applications.
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Carbon Steel Cap Nut Application Industries
Sunflex Metal Industries are engaged in manufacturing of robust quality of Carbon Steel Cap Nut. These Carbon Steel Cap Nut are widely used in the following industries:
Mining Industries Transport Industries- Rail and Road Construction Industries / Building Systems Manufacturing Industries Agriculture Industries Energy Industries Water Industries Automotive Industries Ship Building Industries Nuclear Power Plant Paper & Pulp Industries Sugar Industries Engineering Cement Industries Petro-Chemical Industries Food Industries Oil & Gas Industries Chemical & Pharmaceutical Industries
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