The washers are held in place with the major diameter of the thread being larger than the hole of the washer. This is achieved by inserting the washers before thread rolling.

SEMS screws provide design and manufacturing efficiencies by combining multiple parts, captive washer and screw, into one versatile fastener.

This has many benefits which have revolutionised assembly manufacturing processes, particularly in the Aerospace Avionics sector.

Advantages

– Increased productivity by eliminating hand assembly of washers with the screws.
– Permanent assembly ensuring that the washers are not misplaced.
– Safety for the product as there is no chance of a washer being dropped into the assembly.

– One part to inventory, track and assemble.

SEMS screws work well in products with small dimensions, allowing for seamless integration and assembly with a lower risk of error or failure.

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Pan Head Screws

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The pan head is a commonly used head style for screws.

It looks like an upside down frying pan – pan head screws have a cylindrical head with a slightly rounded top surface and a flat bearing surface underneath.

Pan head screws are visually appealing and can take higher torque and provide better clamping force.

This head style is ideal for most applications where a protruding head is acceptable.

Pan Head Machine Screws

Pan Phillips Screws

The Phillips screw drive (specified as an ANSI Type I Cross Recess and type H in ISO documentation) is among the most popular drive style for screws.

Cross recess H (Phillips) according to ISO 4757 has a conventional cruciform recess with all walls inclined, the end of the screwdriver having trapezoid webs.

The design is often criticized for its tendency to cam out at lower torque levels than other “cross head” designs.

Applicable standards

IS 7483 – Indian Standard
DIN 7985 – DIN [German] standard
ISO 7045 – International Standards Organisation
JIS B1111 – Japanese standard

DIN Sizes from M1.6
Micro Sizes now available starting from M1.0

Materials – Steel, Stainless Steel AISI 304 and 316, Titanium on request.

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Captive Screws

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Captive screws basically are specially designed to lock into position in a hole, enabling easy setting up and removing of the attached pieces even without the complete removal of the screw.

A conventional screw typically passes through a clearance hole in one part and then screws into a threaded hole in a second part — so the first part is clamped to the second.

However, when the fastener is unscrewed from the threaded hole in the second component, it can easily separate from the first one.

A captive screw is designed to prevent this from occurring. It can freely rotate within the first component, with some axial movement, but it’s unable to separate from it.

USES : Captive screws are used when fasteners must remain attached to equipment, such as in cover panels. They are a requirement for several machinery safety standards.

They provide a secure joining, and avoid fastener loss or damage that might be caused by a loose part.

Captive screws come with Philips, Allen head or standard heads that are designed for usage with drill equipment and ordinary screwdrivers.

Captive screws can be found in several configurations and sizes much like the conventional screws premeditated to be utilized for large number of applications.

Material: Stainless Steel AISI-304.

SS-316 on special order.
Size Range: M2 to M6 in ready stocks

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Safety & Conical Spring...

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These are used for locking a device and reducing the vibration. They reduce loosening by preventing unscrewing rotation of the fastening device; locking washers are usually also spring washers.

Washers are available in a wide range such as spring washers, star washers, multi-tooth washers, disc spring washers, wave washers, taper washers, safety washers etc.

Serrated Safety Washers Type S – Schnorr Type

The Safety Washers are of trapezoidal cross section and serrated on both sides. The security is achieved through friction and mechanical locking.

Advantages

The cross section ensures locking effect at the outside diameter.
Due to the closed ring form, high degree of pretensioning is achieved.
Sliding surfaces allow tightening with damaging the mating surfaces.
High resistance to vibration due to positive locking of the serrations
Suitable for a wide range of screw/bolt heads minimizing stocks.

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CSK Torx Machine Screws 6-Lo...

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The notion of a drive with hexalobular sockets are a decisive step in developing drives better adapted to manual and automated assembly. This drive is becoming increasingly popular throughout the world.

Features

Standard – ISO 14581
Our range of CSK Torx head screws is presently in Stainless Steel.
Gives a flush finish
Materials: AISI-304 AISI-316
Size Range: M1.6 to M10 up to 150mm length
Finish – Passivated. Black coating on special orders

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Hex Self Tapping Screws

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Self-tapping screws are different to traditional screws as they tap their own threads when screwed into either plastic, wood or metal.

USAGE GUIDELINES

– The pilot hole size is very important to achieve a proper installation. Make trials using the guidelines in the product datasheets before mass production. The hole size would be dependent upon the base material strength, base material thickness, pull out strength and ease of installation required.

– Do not overtighten. Use the correct tightening Torque as recommended. See the product datasheets for information. Usage of Torque control drivers is suggested.

– Do NOT use the screws to compensate for any alignment defects by applying more force than required. This will cause un-stability of the connection and unpredictable failure.

– Use the correct countersink tool for CSK screws to achieve a flush fixing.

– Use a good quality drive bit to avoid excessive play and Cam out problems.

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SCHS SEMS Screws Allen Cap

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SEMS Screws are screws pre-assembled with free spinning washers. The assembly typically contains one plain washer and one split spring washer.

The washers are held in place with the major diameter of the thread being larger than the hole of the washer. This is achieved by inserting the washers before thread rolling.

SEMS screws provide design and manufacturing efficiencies by combining multiple parts, captive washer and screw, into one versatile fastener.

This has many benefits which have revolutionised assembly manufacturing processes, particularly in the Aerospace Avionics sector.

Advantages

– One part to inventory, track and assemble.

SEMS screws work well in products with small dimensions, allowing for seamless integration and assembly with a lower risk of error or failure.

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Countersunk or Flat Head Scr...

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SCREWS

Countersunk screws are also called Flat head or CSK screws. These screws have a flat head which tapers along the shaft.

Flat head screws are used for flush mounting of sections, usually where one part slides over another or one part is mounted on another. They are used with a countersunk hole to provide a flush, snag free fit.

Countersunk head screws, like button heads and low heads, are limited by configuration in their tensile strength capability. Because of this, they should not be used in applications requiring full strength, where Socket Head Cap Screws should be used.

Flat head screws require a matching counter in the workpiece.

The Countersunk head is preferred to obtain a flush and level finish without any projection in metal or plastic. They sink into the surface to give a smooth exterior finish.

The head angle for metric countersunk socket screws is 90 degrees up to & including M20 and 60 degrees over M20.

The head angle for Imperial is different – Unified is 82 degrees and British thread forms are 90 degrees.

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MicroFast Machine Screws

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The MicroFast special range of micro size machine screws starts from M1.0x0.25.

As products keep getting smaller and smaller, there is a real need to have very small screws and nuts to connect a number of mini components.

This range provides a solution to the many industries that need reliable fixing options in the Micro range.

Our range of micro fasteners include a range of Machine screws.

Starting from M1x0.25 onward.

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Retaining Washers

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Retaining Washers feature internal fins, which grip the thread of a fasteners, creating a self-retaining fastening. Retaining Washers are designed for use with Captive. The combination of Captive Screw and Retaining Washer creates a lightweight and cost-effective locking solution for safety applications.

A Plastic Retaining Washer is primarily used to hold screws and bolts in place during assembly and have a design that grips the outside of screw or bolt shank. Also known as an Anti Loss Washer, they provide insulation, cushioning and spacing. They help insulate fastening assemblies from moisture and electricity.

This washer range includes options with internal and external teeth with a tapered design. The washer slides/assembles on to the screw (or bolt) and is retained by the screw once assembled. The washer cold forms and fully enters the pitch of the screw to provide sealing.

These washers allow for preliminary mounting of the screw (or bolt) before securing with a nut. They are ideal when pre-assembly of the screw and washer is required.

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SHCS Torx Machine Screws 6-L...

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6-Lobe Socket Head Cap Screws as per DIN 912

SHCS Torx is a very useful screw form that provides a very reliable fixing for machine construction.

SHCS Torx are also available in Black finish on request.

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Ultra Low Profile Metric Scr...

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These are available with a special Narrow Head.

The smaller head enables greater weight and space saving.

Available in Stainless Steel AISI 304 grade
Sizes: M2.5 to M4

Also available in Black Coated Finish on request

This finish is very useful in reducing light reflection from parts and providing an integrated finish to black coloured products and parts.

These screws have a permanent black colour with exceptional strength and elasticity that does not chip, peel, craze, or rub off and provides good resistance to wear and abrasion.

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Low Head Torx Machine Screws...

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Low head socket cap screws are designed to be used in special applications where head height clearance is a problem. Because of their reduced head height and smaller socket size, they normally cannot be pre-loaded as high as a standard socket head cap screw and should not be subjected to high dynamic loads.
Suitable for use in parts too thin for standard height socket cap screw and for applications with limited clearances.

Available with Hexagonal Socket Head and 6-Lobe (ISO-14580) Socket Head for more reliability.

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Ultra Low Profile Screws Uni...

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Our JCSlim range of Ultra-thin head screw are up to 77% thinner than conventional pan head which makes possible flat external surface and contributes low-profile design and weight saving.

Usage Guidelines

Always keep the tightening torque within the recommended torque range. This will prevent screw and joint failure. Consult the product datasheet for details. Using a torque enabled driver is recommended.
Check tapped hole with thread plug gauge before assembly to ensure perfect installation.
Use a good quality Hexalobular bit and check that there is no excessive play before applying torque.

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Flanged Button Head Torx Mac...

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Flanged Button Head 6-Lobe (TORX)

Made as per ISO 7380-2, this screw type is extremely useful to provide a low profile fixing in slotted holes and softer materials.

The Flanged head helps distribute the load over the surface.

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Hex Bolts & Screws

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We offer a wide range of metal bolts and studs. What is the difference between screws and bolts?

Bolts can be described as long shafts with a distinct head on one side. These are generally partially threaded.

A fully threaded bolt is referred to as a screw.

Hex screws:

The work horse of any industry, the ubiquitous screw is needed in every machinery in some size or the other. We have a varied range to cater to all your different needs.

Metric Series:

IS 1364, ISO 4017, DIN 933

Materials: Titanium, Alloy Steel (high tensile), mild steel, Brass and stainless steel (AISI 304 and 316)

Mechanical:

For alloy steel property class 8.8 and 10.9 as per IS 1367, ISO 898 part I.

For mild steel 4.6 class

For Stainless Steel property class 50, 70 and 80[High Strength]

Size Range : M2.5 to M36 .Lengths from 10mm to 400mm

Inch Series

BSW: BS-1083

Threads: BS Whitworth, BS 84

Materials: Titanium, Alloy Steel (high tensile), mild steel and stainless steel AISI304 & AISI316

Mechanical: BS 2470 for Alloy Steel. Size range:(1/8”), 3/16”, ¼”, 5/16”. 3/8”, (7/16”), ½”, 5/8”, 3/4”, (7/8”), (1”). Lengths 3/8” to 8”Sizes in brackets are non-preferred standards and availability is limited.

Hex Bolts:

Metric Series:

DIN 931 ISO 4014

Materials: Titanium, Alloy Steel (high tensile), mild steel, Brass and stainless steel (AISI 304 and 316)

Mechanical:

For alloy steel property class 8.8 and 10.9 as per IS 1367, ISO 898 part I.

For mild steel 4.6 class

For Stainless Steel property class 50, 70 and 80[High Strength]

Size Range : M2.5 to M36 .Lengths from 10mm to 400mm

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Ultra Low Profile Wafer Head...

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These screws feature a reliable TORX drive that facilitates more reliable installation and support smaller and lighter design.

With the miniaturisation of a large number of products, this has become an invaluable addition to the range of screws. With a flattened fastening face, this supports layers of parts.

The Hexalobular Torx drive provides a slip-less and easy fixing. Stainless Steel provides long life and corrosion resistance.

Applications:

-For flat surface design without head edge
-For smooth appearance design

In installation where the part does not permit deep enough holes to make a countersunk.

The large diameter heads of the low-profile screws have been engineered to spread the load across a wide surface to provide greater holding power in thinner material applications. These offer a sleek, unobtrusive and polished finish for any design.

Saves space and permits flexible design, especially in weight and space sensitive applications such as drones, electric scooters, aerospace and medical equipment.

JCSlim Low Profile Wafer Head Screws

Low profile or Wafer Head screws are often used in laptops and other electronic components.

Made from Steel with a Black Coating, this has many advantages.

Magnetic to facilitate easy holding to the driver bit.
Black coated to match with most electronic assemblies and light absorption.
Low profile head for space and weight saving.
Lengths as short as 2 mm for an M2 screw available.
Lengths in decimals also available eg. 2.5, 3.5 etc

Available in Steel BLACK coated.
Sizes: M1.2 to M3

This finish is very useful in reducing light reflection from parts and providing an integrated finish to black coloured products and parts.

These screws have a permanent black colour with exceptional strength and elasticity that does not chip, peel, craze, or rub off and provides good resistance to wear and abrasion.

Applications:

For flat surface design without head edge
For smooth appearance design
In installation where the part does not permit deep enough holes to make a countersunk.

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Allen Cap SHCS

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Socket caps have a small cylindrical head with tall vertical sides. Allen (hex socket) drive is a six-sided recess [Internal Hex Socket] for use with an Allen wrench (hex key). This design is the workhorse of the machine building industry.

The most important reasons for the increasing use of socket head cap screws in industry are safety, reliability and economy. All three reasons are directly traceable to the superior performance of socket screws vs. other fasteners, and that is due to their superior strength and advanced design. Available in full thread and half thread.

Standards: DIN 912, ISO 4762, Low Head – DIN 7984

Materials: Alloy Steel, Stainless Steel – AISI 304 and AISI 316, Titanium

Size Range: M1.6 to M24 up to 200mm length. 2-56UNC to 1″

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Carriage Bolts

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We offer a wide range of metal bolts and studs. What is the difference between screws and bolts?

Bolts can be described as long shafts with a distinct head on one side. These are generally partially threaded. A fully threaded bolt is referred to as a screw.

Square Neck Carriage Bolts

This is known by different names such as Carriage Bolts, Coach bolts/ Round Head Square neck bolt, Mushroom Head Square neck bolt etc. Useful for fastening wood and metal together.

It is distinguished from other bolts by its shallow mushroom head followed by a square neck, while the shank cross section of the bolt is circular.

This gives the bolt its self locking feature. The square neck grips into the part being fixed preventing the head from turning when the nut is tightened.

Standard – DIN 603

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Chintamani Overseas is a trusted global supplier and exporter of premium-quality wire mesh and fasteners.

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SEMS SCREWS

Advantages

Pan Head Machine Screws

Pan Phillips Screws

Some Products

6-Lobe Socket Head Cap Screws as per DIN 912

Also available in Black Coated Finish on request

Flanged Button Head 6-Lobe (TORX)

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