Castle Nuts, also known as Slotted Nuts, are a type of locking nut designed with notches (slots) cut into one end. The design resembles the turrets of a medieval castle—hence the name.
They are commonly made from carbon steel, stainless steel, brass, or alloy steel, and are available in various coatings for corrosion resistance. The castellated design ensures mechanical locking without the need for adhesives, making them ideal for high-vibration applications in automotive, aerospace, and heavy machinery sectors.
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Key Attributes
- Material Carbon Steel / Stainless Steel / Brass / Alloy Steel
- Grades Available SS 304, SS 316, MS, ASTM A194 Grade 2H, EN8, EN19
- Size Range M5 to M100 (¼” to 4”)
- Height Range 5 mm to 100 mm (depends on size)
- Hardness 80–320 HV (depending on grade)
- Tensile Strength 400–1000 MPa
Copper Washers are flat, round metal discs with a central hole, used to distribute the load of a threaded fastener such as a bolt or screw. Made from high-quality copper, these washers offer excellent electrical and thermal conductivity.
They are especially valued in sealing and electrical applications where conductivity and leak-proof performance are essential. Copper washers are available in annealed (soft) and hardened conditions, depending on the requirement.
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Key Attributes
- Material Pure Copper / Electrolytic Copper (Cu ≥ 99%)
- Type Flat Washer / Sealing Washer / Crush Washer
- Temper / Condition Soft (Annealed) / Hard (Hardened)
- Outer Diameter (OD) 4 mm to 100 mm (customizable)
- Inner Diameter (ID) 2 mm to 90 mm (customizable)
- Thickness Range 0.5 mm to 5 mm
- Hardness 45–90 HV
- Melting Point 1083°C
Cotter pins are often used in conjunction with clevis pins, castle nuts, or other fasteners to prevent loosening or accidental disassembly.
A cotter pin (also known as a split pin) is a simple, yet effective mechanical fastener used to secure two components together. It consists of a bent metal pin, usually with a loop at one end and two tines (prongs) at the other. After insertion through a hole, the tines are bent apart to hold the pin in place.
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Key Attributes
- Type Double-Split, R-Type, Hairpin Type (as variants)
- Material Mild Steel (MS), Stainless Steel (SS304 / SS316), Brass, Copper
- Surface Finish Plain, Zinc Plated, Nickel Plated, Galvanized, Passivated
- Standard Compliance DIN 94, ISO 1234, BS 1574, ASME B18.8.1
- Head Type Loop (Eye) Head
- Pin Diameter (d) 1.6 mm – 12.7 mm (1/16" – 1/2")
- Tensile Strength Approx. 400 – 600 MPa (depends on material)
A Disc Washer (also known as a Belleville Washer, Conical Spring Washer, or Cup Washer) is a conically shaped washer designed to provide a spring-like action when compressed. Unlike flat washers that simply distribute load, disc washers offer tension
They are used in assemblies where maintaining bolt tension under varying loads, vibration, or thermal expansion is critical. The conical design allows it to deflect elastically under load, providing controlled movement and consistent pressure.
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Key Attributes
- Type Conical, Serrated, Flat, or Slotted Type
- Material Spring Steel, Stainless Steel (AISI 304 / AISI 316), Carbon Steel, Inconel, Phosphor Bronze
- Surface Finish Black Oxide, Zinc Plated, Phosphate Coated, Passivated, Plain
- Outer Diameter (OD) 6 mm – 200 mm
- Inner Diameter (ID) 3 mm – 100 mm
- Operating Temperature Range Up to 300°C (for Stainless Steel) / 200°C (for Carbon Steel)
- Tensile Strength 1100 – 1300 MPa
Dome Nuts, also known as Acorn Nuts or Cap Nuts, are a type of hex nut with a domed or rounded closed end. This dome covers the exposed male thread of a bolt or stud, offering both aesthetic appeal and functional protection.
They are used where appearance, safety, or protection of threads is important — preventing injury, corrosion, or damage from external contact. Dome nuts are commonly used in automotive, furniture, and machinery assemblies.
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Key Attributes
- Type Standard Dome Nut / High Dome Nut / Low Dome Nut
- Material Stainless Steel (AISI 304 / 316), Mild Steel, Brass, Carbon Steel
- Surface Finish Nickel Plated, Chrome Plated, Zinc Plated, Polished, Plain
- Thread Type Metric (M3 – M24) / UNC / UNF
- Shape Hexagonal Base with Domed Top
- Height (Overall) 1.2 × to 1.6 × Nominal Thread Diameter
- Tensile Strength 400 – 800 MPa (depending on material)
External circlips are installed on the outside diameter (OD) of a shaft — when fitted into the groove, they provide a secure axial restraint while allowing for quick assembly and disassembly.
An External Circlip (also known as an External Snap Ring) is a semi-flexible metal ring designed to fit into a groove on a shaft. It acts as a retaining ring to prevent lateral movement of components, such as bearings, gears, or pulleys, along the shaft.
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Key Attributes
- Type External (for shafts)
- Material Spring Steel, Stainless Steel (AISI 304 / 316), Carbon Steel, Phosphor Bronze
- Surface Finish Black Oxide, Phosphate Coated, Zinc Plated, Plain, Passivated
- Shaft Diameter Range 3 mm – 300 mm
- Thickness (t) 0.4 mm – 5 mm (depending on size)
- Hardness 420 – 500 HV (Vickers Hardness)
- Tensile Strength 1000 – 1300 MPa
- Operating Temperature Up to 250°C (Spring Steel) / 300°C (Stainless Steel)
An Internal Circlip (also known as an Internal Snap Ring or Retaining Ring) is a semi-flexible ring-shaped fastener designed to fit into a groove on the inside of a cylindrical bore or housing. It prevents axial movement of components.
Unlike external circlips that fit around a shaft, internal circlips are installed inside a bore using circlip pliers. Once seated in the groove, they act as a mechanical stop for internal components, ensuring secure retention and alignment.
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Key Attributes
- Material Spring Steel / Stainless Steel (AISI 304 / 316)
- Standard DIN 472 / IS 3075 / ISO 8749
- Bore Size Range 8 mm – 400 mm
- Thickness 0.4 mm – 5 mm
- Hardness 420 – 500 HV
- Tensile Strength 1000 – 1300 MPa
Spring washers are commonly used in mechanical assemblies, electrical systems, automotive, and machinery applications where reliability and vibration resistance are essential.
A Spring Washer, also known as a Split Lock Washer, is a helical-shaped washer designed to prevent loosening of fasteners under vibration or dynamic loads. When a spring washer is compressed during tightening, it exerts a continuous spring force on the fastener assembly, maintaining tension and friction to keep the nut and bolt securely in place.
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Key Attributes
- Material Spring Steel / Stainless Steel (AISI 304 / 316) / Brass
- Inner Diameter 3 mm – 100 mm
- Outer Diameter 6 mm – 150 mm
- Thickness 0.5 mm – 6 mm
- Thickness 0.5 mm – 6 mm
- Operating Temperature Up to 300°C
A Slotted Nut (also known as a Castle Nut or Castellated Nut) is a type of hex nut with slots (grooves) cut into one end. These slots allow the nut to be secured with a cotter pin or wire through a hole in the bolt or stud.
Slotted nuts are widely used in applications where locking and safety are critical, such as automotive, aerospace, and machinery assemblies. They are often paired with a drilled bolt and cotter pin to ensure a positive locking mechanism.
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Key Attributes
- Material Mild Steel / Stainless Steel (AISI 304 / 316) / Brass
- Standard DIN 935 / ISO 7035 / BS 1768
- Hardness 120 – 250 HV
- Tensile Strength 400 – 800 MPa
- Locking Method Cotter Pin or Safety Wire
- Operating Temperature Up to 300°C
- Corrosion Resistance Excellent (SS), Moderate (MS Plated)
A GI Slotted Channel (Galvanized Iron Slotted Channel), commonly known as a Strut Channel or C-Channel, is a metal framing system made from galvanized steel with pre-punched slots along its length. These channels are widely used for mounting.
The slots allow easy adjustment and fastening of accessories using bolts, nuts, and clamps, offering flexibility in installation and alignment. The galvanized coating provides excellent corrosion resistance, making GI slotted channels suitable for both indoor and outdoor structural applications.
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Key Attributes
- Material Galvanized Iron / Mild Steel
- Finish Hot Dip Galvanized / Pre-Galvanized / Powder Coated
- Corrosion Resistance Excellent
- Applications Electrical, Plumbing, HVAC, Solar, Construction
- Load Type Light / Medium / Heavy Duty
A GI Thread Rod (Galvanized Iron Threaded Rod) is a long, fully threaded metal rod used for fastening, suspending, or joining components in structural and mechanical applications.
The galvanized coating provides strong corrosion resistance, making GI threaded rods ideal for both indoor and outdoor use in electrical, plumbing, construction, and industrial installations. They are also known as stud rods, all-thread rods, or threaded bars.
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Key Attributes
- Material Galvanized Iron / Mild Steel
- Standard DIN 975 / ASTM A307 / BS 4439
- Diameter Range M6 – M36
- Length 1 m / 2 m / 3 m / Custom
- Finish Hot Dip Galvanized / Electro-Galvanized / Zinc Plated
- Coating Thickness 40 – 100 microns
- Tensile Strength 400 – 800 MPa
A Lifting Eye Bolt is a mechanical fastener with a circular ring (eye) at one end and a threaded shank at the other. It is designed to serve as a lifting or anchoring point for hoisting, rigging, and securing loads.
The lifting eye provides a secure attachment point, and when installed correctly, it ensures a reliable connection capable of handling significant loads.
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Key Attributes
- Material Carbon Steel / Alloy Steel / Stainless Steel (AISI 304 / 316)
- Standard DIN 580 / ISO 3266 / BS 4278
- Type Plain / Shoulder / Collared / Machinery
- Thread Size M6 – M48
- Load Capacity 0.1 Ton – 20 Tons
- Tensile Strength 800 – 1000 MPa
- Hardness 200 – 300 HB
- Operating Temperature Up to 400°C
A Long Nut (also known as a Coupling Nut or Extension Nut) is a hexagonal-shaped nut that is longer than a standard hex nut and is used to join two male threaded rods or bolts together.
It provides a secure and extended threaded connection, commonly used in construction, machinery, and electrical supports. The longer body allows more thread engagement, which improves load-bearing capability and stability.
Long nuts are available in various materials and finishes to suit different mechanical and environmental requirements.
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Key Attributes
- Material Mild Steel / Stainless Steel (AISI 304 / 316) / Brass
- Standard DIN 6334 / ISO 4032 / BS 1768
- Thread Size M4 – M36
- Length 1.5× – 3× Nominal Thread Diameter
- Tensile Strength 400 – 800 MPa
- Operating Temperature Up to 300°C
- Applications Construction, Machinery, Electrical, HVAC, Solar
A Scaffolding Clamp (also known as a Scaffolding Coupler) is a mechanical fitting used to securely connect and fasten scaffolding tubes, ensuring stability and strength in temporary structures such as platforms, towers, and formwork.
These clamps are crucial components in construction and industrial maintenance, allowing pipes or tubes to be joined at various angles and configurations. They are typically made of forged steel or pressed steel, with zinc or galvanized coating to resist corrosion.
Scaffolding clamps are available in different types depending on their function — such as Right Angle (Double) Couplers, Swivel Couplers, Putlog Couplers, and Sleeve Couplers.
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Key Attributes
- Material Forged Steel / Mild Steel
- Standard BS 1139 / EN 74 / IS 2750
- Type Right Angle / Swivel / Sleeve / Putlog
- Tube Size 48.3 mm OD
- Safe Working Load (SWL) 6.3 – 12.5 kN
- Torque 45 – 55 Nm
Steel Balls are precision-engineered spherical components made from high-grade steel, designed for use in a wide range of mechanical, industrial, and engineering applications.
Different grades of steel (such as carbon steel, stainless steel, and chrome steel) are used depending on the required strength, corrosion resistance, and application environment.
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Key Attributes
- Material Carbon Steel / Chrome Steel / Stainless Steel
- Standard AFBMA / DIN 5401 / ISO 3290
- Size Range 1 mm – 150 mm
- Hardness 58 – 66 HRC
- Tolerance Grade G10 – G200
- Finish Polished / Mirror / Bright
- Tensile Strength 850 – 1000 MPa
Aluminium Pop Rivets (also known as Blind Rivets) are permanent mechanical fasteners used to join two or more materials where access is available from only one side of the assembly (the “blind” side).
These rivets are installed using a rivet gun, which pulls the mandrel through the body, causing the body to expand and clamp the materials tightly. After installation, the mandrel breaks off, leaving a secure and neat finish.
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Key Attributes
- Material (Body) Aluminium Alloy
- Material (Mandrel) Steel / Stainless Steel
- Head Type Dome / Countersunk / Large Flange
- Diameter 2.4 mm – 6.4 mm
- Length 6 mm – 25 mm
- Shear Strength 200 – 500 N
- Tensile Strength 300 – 600 N
Copper Rivets are solid or semi-tubular fasteners made from high-purity copper, known for their excellent conductivity, ductility, and corrosion resistance. They are used to permanently join two or more materials by deforming one end of the rivet.
These rivets are ideal for electrical, marine, roofing, and leather applications due to copper’s superior anti-corrosive and non-sparking properties. The soft and malleable nature of copper makes it easy to form heads during installation while maintaining durability and conductivity.
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Key Attributes
- Material Pure Copper / Copper Alloy
- Standard IS 2907 / DIN 660 / ISO 10582
- Type Solid / Semi-Tubular / Flat Head / Round Head
- Diameter 1.5 mm – 10 mm
- Finish Natural / Polished / Nickel Plated
An E-Clip (also known as an E-Ring or E-Type Retaining Ring) is a semi-flexible, open-ended fastener designed to fit into a groove on a shaft or in a bore. It provides a secure axial retention for components such as bearings, gears, and pulleys.
The name “E-Clip” comes from its shape — resembling the letter “E” — which allows it to snap into place quickly without full circumferential access. E-clips are widely used in mechanical, automotive, and industrial equipment where quick assembly and compact retention are required.
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Key Attributes
- Type External Retaining Type
- Material Spring Steel, Stainless Steel (AISI 304 / 316), Carbon Steel, Phosphor Bronze
- Surface Finish Black Oxide, Zinc Plated, Phosphate Coated, Passivated
- Shaft Diameter Range 1.2 mm – 50 mm
- Hardness 420 – 500 HV (Vickers Hardness)
- Tensile Strength 1000 – 1300 MPa
- Operating Temperature Up to 250°C (Spring Steel) / 300°C (Stainless Steel)
