High Tensile Fasteners Manufacturer in India
Rajtilak Metal is an internationally recognized manufacturer and stockist of high tensile fasteners engineered to withstand substantial tensile, shear and vibrational loads. High tensile steel fasteners are manufactured from carefully formulated medium carbon or alloy steels, quenched and tempered to achieve enhanced mechanical properties. These fasteners provide exceptional clamp load security across heavy industrial structures, pressure pipelines, refineries, power plants and offshore drilling installations.
Our comprehensive production program includes High Tensile Hexagon Head Bolts, Heavy Hex Nuts, Continuous & Double-Ended Studs, Socket Head Cap Screws, Threaded Rods, Nylock Nuts, and Through-Hardened Structural Washers. Every component is produced according to international dimensions including ISO 4014, ISO 4017, DIN 931, DIN 933, IS 1364, BS 1083, BS 1768 and ASTM specifications. Comprehensive surface finishing is executed in-house, including hot dip galvanizing (HDG), zinc electroplating, PTFE/Teflon fluoropolymer coating, and zinc-aluminium flake protective coats for aggressive marine environments.
Technical Quick Reference Guide
- • Alloy Steel Fasteners Standards
- • Carbon Steel Fasteners Standards
- • HT Hex Head Bolts Specifications
- • High Tensile Hex Nuts Specifications
- • Through-Hardened Washers Parameters
- • M4 to M52 Hex Bolt Metric Dimensions
- • UNF / UNC High Tensile Bolt Dimensions
- • IS 1364 & ISO 4017 Hex Screws Data
- • Prevailing Torque Nylock Nuts Chart
- • Metric & Imperial Threaded Rod Sizes
- • Grade 8.8 / 10.9 / 12.9 Mechanical Properties
- • Fastener Weight & Torque Guidelines
High Tensile Fasteners
High Tensile Hex Bolts
High Tensile Hex Nuts
Standard Specifications for High Tensile Alloy Steel Fasteners
Manufactured under strict ISO 9001 certified quality controls, our alloy steel fasteners deliver proven yield performance and fatigue resistance in high pressure operations.
| Dimensional Standard | Component Description | Diameter Range | Length Coverage | Protective Coating Options | Property Class / Grade |
|---|---|---|---|---|---|
| ISO 4014 / DIN 931 | High Tensile Hex Bolts (Partially Threaded) | M12 to M100 | 20 mm to 500 mm | Plain, Zinc Flake, PTFE/Teflon, HDG, Zinc Plated, Geomet | Grade 8.8 / 10.9 |
| ISO 4017 / DIN 933 | High Tensile Hex Screws (Fully Threaded) | M12 to M100 | 20 mm to 500 mm | Zinc Flake, Geomet, HDG, Plain, PTFE/Teflon, Zinc Plated | Grade 10.9 / 12.9 |
| ASTM A193 / A194 | High Tensile Stud Bolts & Heavy Hex Nuts | 1/2″ to 4″ | 3/4″ to 20″ | Hot Dip Galvanized, Fluoropolymer, Cadmium, Zinc Plated | Grade B7 / L7 / B16 |
| BS 1768 / BS 1083 | High Tensile Hex Head Fasteners (Imperial) | 1/2″ to 4″ | 20 mm to 500 mm | Plain, PTFE, Zinc Flake, HDG, Electro-galvanized | Grade R, S, T, V |
High Tensile Screws
High Tensile Washers
High Tensile Threaded Rods
Carbon Steel Fastener Standard Specifications
Precision-threaded carbon and alloy steel high tensile fasteners suited for process piping, structural bolting and general mechanical engineering.
| Standard Reference | Fastener Type | Size Diameter | Length Availability | Standard Finish | Material Class / Grade |
|---|---|---|---|---|---|
| ISO 4014 / DIN 931 | Hex Head Bolts | M12 to M100 | 20 mm to 500 mm | Zinc Plated / Plain / Hot Dip Galvanized | Property Class 8.8, 10.9 |
| ISO 4017 / DIN 933 | Hex Head Set Screws | M12 to M100 | 20 mm to 500 mm | HDG / Electro Zinc / Phosphated | Property Class 8.8, 10.9, 12.9 |
| ASTM A193 / A194 | High Temperature Hex Bolts & Nuts | 1/2″ to 4″ | 3/4″ to 20″ | Plain / Zinc Plated / Hot Dip Galvanized | Class 2, B8, B8M, B8T, Gr. 2H |
| ASTM A307 | Carbon Steel Hex Screws & Studs | 1/2″ to 4″ | 3/4″ to 20″ | Plain / Hot Dip Galvanized / Clear Zinc | Grade A, B, C |
Dimensional Chart: Metric High Tensile Hex Bolts (BS 1083 / IS 1364 / ISO 4014)
Dimensions in millimeters for standard pitch metric hex head bolts from M4 to M52 diameter.
| Diameter | Pitch | Head Across Flats (Max) | Head Across Flats (Min Gr.A) | Head Height (Nominal) | Across Corners (Min Gr.A) | Thread Length (≤125mm) | Thread Length (>125mm) |
|---|---|---|---|---|---|---|---|
| M4 | 0.7 | 7.00 | 6.78 | 2.80 | 7.66 | 14 | 20 |
| M6 | 1.0 | 10.00 | 9.78 | 4.00 | 11.05 | 18 | 24 |
| M8 | 1.25 | 13.00 | 12.73 | 5.30 | 14.38 | 22 | 28 |
| M10 | 1.5 | 16.00 | 15.73 | 6.40 | 17.77 | 26 | 32 |
| M12 | 1.75 | 18.00 | 17.73 | 7.50 | 20.03 | 30 | 36 |
| M16 | 2.0 | 24.00 | 23.67 | 10.00 | 26.75 | 38 | 44 |
| M20 | 2.5 | 30.00 | 29.67 | 12.50 | 33.53 | 46 | 52 |
| M24 | 3.0 | 36.00 | 35.38 | 15.00 | 39.98 | 54 | 60 |
| M30 | 3.5 | 46.00 | 45.00 | 18.70 | 50.85 | 66 | 72 |
| M36 | 4.0 | 55.00 | 53.80 | 22.50 | 60.79 | 84 | 90 |
| M42 | 4.5 | 65.00 | 63.10 | 26.00 | 71.30 | 96 | 102 |
| M48 | 5.0 | 75.00 | 73.10 | 30.00 | 82.60 | 108 | 114 |
Dimensional Chart: High Tensile Imperial Hex Bolts (UNC / UNF to BS 1768)
Dimensions in inches for UNC and UNF unified series high tensile hex head bolts.
| Diameter | UNC Pitch (TPI) | UNF Pitch (TPI) | Across Flats (Min) | Across Flats (Max) | Head Height (Min) | Head Height (Max) | Across Corners (Max) |
|---|---|---|---|---|---|---|---|
| 1/4″ | 20 | 28 | 0.430 | 0.437 | 0.153 | 0.163 | 0.505 |
| 5/16″ | 18 | 24 | 0.493 | 0.500 | 0.201 | 0.211 | 0.577 |
| 3/8″ | 16 | 24 | 0.554 | 0.562 | 0.233 | 0.243 | 0.650 |
| 1/2″ | 13 | 20 | 0.742 | 0.750 | 0.313 | 0.323 | 0.866 |
| 5/8″ | 11 | 18 | 0.929 | 0.937 | 0.393 | 0.403 | 1.083 |
| 3/4″ | 10 | 16 | 1.115 | 1.125 | 0.463 | 0.483 | 1.300 |
| 7/8″ | 9 | 14 | 1.300 | 1.312 | 0.543 | 0.563 | 1.515 |
| 1″ | 8 | 12 | 1.488 | 1.500 | 0.597 | 0.627 | 1.732 |
| 1 1/4″ | 7 | - | 1.830 | 1.875 | 0.773 | 0.813 | 2.165 |
| 1 1/2″ | 6 | - | 2.205 | 2.250 | 0.934 | 0.974 | 2.598 |
| 2″ | 4.5 | - | 2.940 | 3.000 | 1.203 | 1.263 | 3.464 |
Dimensional Chart: High Tensile Hex Nuts (IS 1364 / ISO 4032 / DIN 934)
Metric dimensions for standard finished high tensile hexagonal nuts in millimeters.
| Size | Thread Pitch | Across Flats Max | Across Flats Min | Thickness Max | Thickness Min | Across Corners Min |
|---|---|---|---|---|---|---|
| M6 | 1.0 | 10.00 | 9.78 | 5.20 | 4.90 | 11.05 |
| M8 | 1.25 | 13.00 | 12.73 | 6.80 | 6.44 | 14.38 |
| M10 | 1.5 | 16.00 | 15.73 | 8.40 | 8.04 | 17.77 |
| M12 | 1.75 | 18.00 | 17.73 | 10.80 | 10.37 | 20.03 |
| M16 | 2.0 | 24.00 | 23.67 | 14.80 | 14.10 | 26.75 |
| M20 | 2.5 | 30.00 | 29.16 | 18.00 | 16.90 | 32.95 |
| M24 | 3.0 | 36.00 | 35.00 | 21.50 | 20.20 | 39.55 |
| M30 | 3.5 | 46.00 | 45.00 | 25.60 | 24.30 | 50.85 |
| M36 | 4.0 | 55.00 | 53.80 | 31.00 | 29.40 | 60.79 |
Through-Hardened Structural Washers (IS 6649 & DIN 6916)
Manufactured from quench-and-tempered spring or alloy steel with verified hardness rating between 35 and 45 HRC (minimum 26 HRC for hot dip galvanized parts).
| Bolt Size | Outer Diameter (Max mm) | Inner Diameter (Min mm) | Thickness Range (mm) | Weight kg/100 pcs (DIN 6916) |
|---|---|---|---|---|
| M12 | 24.0 | 13.0 | 3.0 | 0.703 |
| M16 | 30.0 | 17.0 | 4.0 | 1.460 |
| M20 | 37.0 | 21.0 | 4.0 | 1.960 |
| M22 | 39.0 | 23.0 | 4.0 | 2.430 |
| M24 | 44.0 | 25.0 | 4.0 | 3.060 |
| M27 | 50.0 | 28.0 | 5.0 | 5.020 |
| M30 | 56.0 | 31.0 | 5.0 | 6.320 |
| M36 | 66.0 | 37.0 | 6.0 | 11.500 |
High Tensile Steel Fasteners: Mechanical Properties (ISO 898-1)
Tested for proof load, yield stress, ultimate tensile strength and elongation according to EN ISO 898-1 standards.
| Property Class | Nominal Tensile Strength (MPa) | Minimum Yield Strength (MPa) | Proof Stress Under Load (MPa) | Elongation After Fracture (%) |
|---|---|---|---|---|
| Grade 8.8 (≤ M16) | 800 | 640 | 580 | 12% |
| Grade 8.8 (> M16) | 830 | 660 | 600 | 12% |
| Grade 10.9 | 1040 | 940 | 830 | 9% |
| Grade 12.9 | 1220 | 1100 | 970 | 8% |
Global Project Export Supply & Testing Approvals
Rajtilak Metal exports certified high tensile fasteners worldwide for major construction, oil, gas and infrastructure developments. Our shipments are rigorously tested for chemical composition, tensile strength, hardness, impact toughness (Charpy V-notch), and coating thickness, complete with EN 10204 3.1 certification.
| Export Category | Primary Destination Markets |
|---|---|
| High Tensile Hex Bolts & Nuts | United Arab Emirates, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain |
| Grade 10.9 & 12.9 Socket Screws | United States, United Kingdom, Poland, Germany, Italy, France |
| Heavy Hex Structural Fasteners | Singapore, Malaysia, Indonesia, Thailand, Philippines, Australia |
| Continuous Threaded Stud Bolts | South Africa, Egypt, Nigeria, Brazil, Canada, Mexico |