High Quality Fasteners Manufacturer Ravina Fasteners

Eye Bolt

Grades/Materials: Zinc plated steel, A2/A4 stainless (A2-70, A4-80)
Thread: Metric M8 (1.25), M10 (1.5), M12 (1.75); UNC 3/8-16, 1/2-13
Application: Lifting and anchoring, slings, lifting points on machines and structures.

Shoulder Bolt (Shoulder Screw)
Grades/Materials: Steel 8.8, Stainless A2
Thread: M6×1.0 – M12×1.75 (short threaded portion); imperial sizes on request
Application: Pivot/rotating assemblies, bearings, guide pins in machinery.

Flange Bolt
Grades/Materials: 8.8, 10.9, A2/A4 stainless
Thread: M8×1.25, M10×1.5, M12×1.75; UNC 1/2-13
Application: Structural connections, engines, reduces need for a washer.

Carriage Bolt
Grades/Materials: Zinc plated steel, stainless
Thread: M8×1.25, M10×1.5; UNC 1/2-13, 5/16-18
Application: Wood fastening, panels, doors, and furniture locks.

U-Bolt
Grades/Materials: Zinc plated steel, A4 stainless
Thread: M8, M10, M12 (standard metric pitch) or 3/8-16, 1/2-13 (imperial)
Application: Pipe fixing, axles, ducts, mounting to cylindrical supports.

Anchor Bolt – Wedge / Chemical Anchor
Grades/Materials: High tensile steel, optional stainless
Thread: M10×1.5, M12×1.75, M16×2.0; dimensions vary by type
Application: Concrete structural fixing, machine bases, seismic safety.

Stud Bolt / Double-End Stud
Grades/Materials: 8.8, 10.9, 12.9, A193 B7 (for high temp/industrial use)
Thread: M8–M36 (standard metric pitch e.g. M16×2.0, M20×2.5); UNC 1/2-13 etc.
Application: Flange joints, turbines, pressure equipment (petrochemical industry).

Eye Nut / Lifting Nut
Grades/Materials: Forged steel, stainless
Thread: M8–M20 corresponding to lifting bolts
Application: Lifting with ropes/hooks, temporary anchoring.

Prevailing Torque / Nylon-Insert Lock Nut
Grades/Materials: Grade 8 steel, A2 stainless with nylon insert
Thread: M4×0.7, M6×1.0, M8×1.25, M10×1.5
Application: Anti-vibration assemblies, automotive, electrical equipment.

Castle Nut / Slotted Nut
Grades/Materials: 8.8, 10.9, stainless
Thread: M6, M8, M10 (standard metric pitch); 1/4-20 UNC etc.
Application: Used with cotter pin/split pin for safety (suspensions, wheels).

Shear Bolt / Breakaway Bolt
Grades/Materials: Steel with specific shear strength
Thread: M8, M10 (depending on torque/force required)
Application: Mechanical protection – breaks under overload (e.g. blades, gears).

Security / Tamper-Proof Bolt
Grades/Materials: Stainless steel, coated
Thread: Various metric/imperial sizes; standard pitch per diameter
Application: Public installations, signage, automotive security.

T-Bolt
Grades/Materials: Steel 8.8, stainless
Thread: M8, M10 etc.; standard pitch M8×1.25
Application: Rails and guides, fastening in T-slots (machine tools, modular systems).

Socket Head Cap Screw (Allen Bolt)
Grades/Materials: 8.8, 10.9, A2/A4 stainless
Thread: M3×0.5, M4×0.7, M5×0.8, M6×1.0, M8×1.25 etc.
Application: Compact mechanical assemblies, molds, precision equipment.

Countersunk Screw
Grades/Materials: 8.8, stainless
Thread: M3–M12 (standard metric pitch)
Application: Panels, windows/doors, flush mounting for aesthetic finishes.

High-Tensile Structural Bolt (ASTM/ISO e.g. A325/A490 / 8.8–12.9)
Grades/Materials: ASTM A325/A490 or ISO 8.8/10.9/12.9
Thread: M16×2.0, M20×2.5, M24×3.0; coarse pitch per structural standard
Application: Steel structures, bridges, heavy construction.

Hex Head Bolt with Prevailing Feature
Grades/Materials: 8.8, 10.9, stainless
Thread: M8×1.25, M10×1.5, M12×1.75; also UNC 1/2-13
Application: Assemblies exposed to vibration in automotive and industrial sectors.

Slotted/Adjustable Nut & Coupling Nut
Grades/Materials: Zinc plated steel, stainless
Thread: Full thread M8–M20; standard metric pitch
Application: Long threaded connections, extensions, mechanical adjustment.

Practical notes:

• Metric coarse pitch examples: M6 = 1.0 mm, M8 = 1.25 mm, M10 = 1.5 mm, M12 = 1.75 mm, M16 = 2.0 mm, M20 = 2.5 mm, M24 = 3.0 mm.

• Metric fine pitch: M8 fine = 1.0 mm, M10 fine = 1.25 mm, M12 fine = 1.5 mm.

• Common UNC: 1/4-20 (20 tpi), 5/16-18 (18 tpi), 3/8-16 (16 tpi), 1/2-13 (13 tpi).

• UNF: 1/4-28, 5/16-24, 3/8-24, 1/2-20.

• Metric grades: 4.6 / 8.8 / 10.9 / 12.9 (increasing tensile strength).

• SAE grades: Grade 2 / Grade 5 / Grade 8 (imperial).

• Stainless: A2-70 (general), A4-80 (marine/chemical resistance).