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Stainless Steel Castle Nut | Alloy Steel Castle Nut | Duplex Steel Castle Nut | Carbon Steel Castle Nut
CASTLE NUT
The castle nut is commonly used on applications where the nut needs to be secured from backing off. It is used with a cotter pin inserted through a hole drilled in the shaft and through the slots in the nut. Castle nuts are most common in fine thread. A more avialable substitue is the Slotted Nut the difference being the turned down top.
Standard finish is Plain
Standard finish is Plain
We manufacturer fasteners with size range from M10 to M100 Hex Nuts, Heavy Hex Nut, Cap Nut, Acorn Nut, Serrated Flange Nut, Coupling Nut, Square Nut, Castle Nut, Wing Nut, Flange Lock Nut, Flex Lock Nut, High Nut, Kep Nut, Jam Nut, Nylon Lock Nut, Slotted Nut, Reversible Lock Nut, Custom Nut, T Nuts & other customized Nuts as per Client's requirement.We produce Hot Forged and Coled Formed Nuts Fasteners.
Carbon Steel
| 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.
Dimensions for DIN935 Slotted up to and including M10 Castle M12 and over
| Diameter | Pitch | Depth of Nut | Across Flats | Width of slot |
| M5 | 0.8mm | 6mm | 8mm | 1.4mm |
| M6 | 1.0mm | 7.5mm | 10mm | 2.0mm |
| M7 | 1.0mm | 8.0mm | 11mm | 2.0mm |
| M8 | 1.25mm | 9.5mm | 13mm | 2.5mm |
| M10 | 1.5mm | 12mm | 17mm | 2.8mm |
| M12 | 1.75mm | 15mm | 19mm | 3.5mm |
| M14 | 2mm | 16mm | 22mm | 3.5mm |
| M16 | 2mm | 19mm | 24mm | 4.5mm |
| M18 | 2.5mm | 21mm | 27mm | 4.5mm |
| M20 | 2.5mm | 22mm | 30mm | 4.5mm |
| M22 | 2.5mm | 26mm | 32mm | 5.5mm |
| M24 | 3.0mm | 27mm | 36mm | 5.5mm |
| M27` | 3.0mm | 30mm | 41mm | 5.5mm |
| M30 | 3.5mm | 35mm | 46mm | 7mm |
| M33 | 3.5mm | 35mm | 50mm | 7mm |
| M36 | 4mm | 38mm | 55mm | 7mm |
| M39 | 4mm | 40mm | 60mm | 7mm |
| M42 | 4.5mm | 46mm | 65mm | 9mm |
| M45 | 4.5mm | 48mm | 70mm | 9mm |
| M48 | 5mm | 50mm | 75mm | 9mm |
| M52 | 5mm | 54mm | 80mm | 9mm |
| M56 | 5.5mm | 57mm | 85mm | 9mm |
| M60 | 5.5mm | 63mm | 90mm | 11mm |
| M64 | 6mm | 66mm | 95mm | 11mm |
Carbon Steel Castle Nut Application Industries
Sunflex Metal Industries are engaged in manufacturing of robust quality of Carbon Steel Castle Nut. These Carbon Steel Castle 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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