Machine Screws
Machine Screws are often used with nuts but also often tightened into tapped holes (without nuts). They might be considered a screw, or a bolt based on the Machinery’s Handbook distinction. In practice, they tend to be mostly available in smaller sizes up to M8.
A quality assured range of machine Screws is available with us in various head and drive styles.
Drive Styles
Slotted- Cross Recessed Phillips and Pozi drive
- 6-Lobe Torx Drive
- Allen Hex Socket Drive
- Tamper-Resistant special drives for enhanced security.
Some special drives have also been developed although they have limited application.
Head Styles
Standard Head Styles:
Cheese head, PAN head, CSK (Countersunk) head, Truss head, Hex Head, Socket Cylindrical head, Flanged head, Low Cylindrical head, Headless Grub Screws etc
Special Styles:
Wing Screws, Eye Screws, Square Neck Dome Head, SEMS type with assembled washers, Captive type with reduced shank, 100° CSK Screws, 120° CSK and Ultra Low Profile Head Screws.
Thread Types
Metric Thread
Special Metric Tri-lobe Thread Forming Screws for Metal
Thread-rolling screws form their nut threads themselves when they are screwed into precut holes.
This not only saves assembly and production costs, but also creates stable and secure connections.
In contrast to thread cutting, the material structure in the mating thread is not interrupted when threading, but compressed and strain hardened.
The nut threads are automatically formed in cast blind holes, passages or in drilled, lasered or punched sheet metal parts.
A tri-lobe thread forming screw forms a thread with a machine screw’s thread pitch.
As each lobe of the screw moves through the pilot hole in the nut material, it forms and work hardens the nut thread metal, producing an uninterrupted grain flow.
For use in drilled, punched or cored holes in ductile metals and punch extruded metals without the need for tapping the material thread.
The tri-lobe thread shape enables the threads to form the internal thread. The screw is designed with a tapered point or commonly referred to as lead threads.
The tapered point allows for lower installation torque during initial thread forming. The tri-lobe shape is key to allowing the remaining threads to form threads with the lowest amount of installation torque.
One important thing to note when determining screw length is that the tapered portion of the thread cannot be fully loaded and should not be used to calculate proper screw length.
Unified Thread
Materials
We have a wide range of materials such as Mild Steel, Hardened Alloy Steel, Stainless Steel grades AISI 304 and 316, Titanium Grade 2 and Brass [on order].
Finish:
Zinc Electroplated White passivation & Yellow Passivation
Stainless Steel Passivated
Zinc Black and Anodised on order.
Range – ISO Metric M3 to M16 up to 120mm length
ISO Metric Micro Series M1.0 to M2.5 up to 50mm length
Inch Series BSW 1/8″ to 1/2″ up to 4″ Length, UNC 2-56 to 1/4-28UNF.
These Machine Screws are manufactured with high precision to ensure quality.
Standards – DIN 84, DIN 85, DIN 912, DIN 933, DIN 963, DIN 965, DIN 7985, JIS B1111, DIN 7500, ISO 14581, ISO 14583, ISO 7380, ISO 5856, NF E 27-128 NF E 25-129.
ROHS Status:
RoHS 3 Compliant in most products
Certification: COC is provided on request and is chargeable.
Tri-lobe Thread Forming Screws for Metal
Thread-rolling screws form their nut threads themselves when they are screwed into precut holes.
This not only saves assembly and production costs, but also creates stable and secure connections.
They are available with Pan and CSK heads.
Available Stainless Steel SS-304 A2.
Go to the Thread Forming Screws for Metal page.
Captive screws
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.
Available with Philips, Allen head drives.
Go to the Captive Screws page.
SEMS Screws
Sems Screws are screws preassembled with free spinning washers. The assembly typically contains one plain washer and one split spring washer.
Ultra-Low Profile Thin Head Screws
Our range of Ultra-Thin head are 77% thinner than conventional pan head which makes possible flat external surface and contributes low-profile design and weight saving.
These are now also available in Black Coated Finish.
Go to the Ultra Low Profile Screws page.
6-Lobe TORX MC Screws as per ISO 10664
The Torx compatible drive is a reliable method of fixing screws. Also known as the 6-Lobe drive this drive can take more torque and does not slip, making it a superior option over Allen or Phillips drives.
6-Lobe screws are available with various head style options:
Pan Head: The PAN Head is cylindrical head with a slightly rounded top surface and a flat bearing surface underneath, providing a very good and tight join.
Countersunk (CSK) or Flat Head: The countersunk head is useful to provide a flush level finish to the assembly.
Socket Head Cap Screws (SHCS): Torx SHCS is a very useful screw form that provides a very reliable fixing for machine construction.
Dome or Button Head: Button Torx screws provide lower profile fixing and are visually appealing.
Flanged Button Head: Flanged Button Torx screws are extremely useful to provide a low profile fixing in slotted holes and softer materials.
Go to the Torx Machine Screws page.
Cross Recessed Phillips MC Screws
The Phillips screw drive is among the most popular drive style for screws. Torx compatible drive is a reliable method of fixing screws. It has a conventional cruciform recess with all walls inclined, the end of the screwdriver having trapezoid webs.
Phillips screws are available with various head style options:
Pan Head: The PAN Head is cylindrical head with a slightly rounded top surface and a flat bearing surface underneath, providing a very good and tight join.
Countersunk (CSK) or Flat Head: The countersunk head is useful to provide a flush level finish to the assembly.
Truss Head: Truss head screws have a wider head providing a better joint and a lower profile finishing.
Pan Head with attached washer: Pan head with attached washer eliminates the need for an additional washer, evens the load on the target surface, helps to prevent the screw from loosening and ensures good grip to the material in which it is fastened.
Go to the Phillips Machine Screws page.
Allen Hex Socket Machine Screws
The Hex socket or Allen compatible drive is a common method of fixing screws. The width across flats of hexagon socket head screws is smaller than the WAF of hexagon head screws, permitting more economic design with smaller sizes.
Hexagonal socket screws are available with various head style options:
Socket Head Cap Screws (SHCS): 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).
Allen Button Head: The Socket Button Head Screw design is primarily used where a lower profile head is required and for aesthetical reasons.
Countersunk (CSK) or Flat Head: The countersunk head is useful to provide a flush level finish to the assembly, usually where one part slides over another or one part is mounted on another.
Flanged Button Head: Flanged Button screws are extremely useful to provide a low profile fixing in slotted holes and softer materials.
Grub or Set Screws: A set screw is a threaded fastener that normally does not have a head. They are available in various points or end options.
Low Head Allen Cap Screws: Low head Socket caps have a smaller head height and are designed to be used in special applications where head height clearance is a problem.
Go to the Hexagonal Socket Machine Screws page.
Slotted Machine Screws
Slotted Machine screws have the traditional slot that runs horizontally through the middle of the head and is intended for use with a flat blade screwdriver bit.
Slotted screws are available with various head style options:
Slotted Cheese Head (CHS): CHS screws have a flat topped nearly cylindrical shaped head.
Pan Head: The PAN Head is cylindrical head with a slightly rounded top surface and a flat bearing surface underneath, providing a very good and tight join.
They have a larger head diameter and thinner head compared to cheese head screws.
Countersunk (CSK) or Flat Head: The countersunk head is useful to provide a flush, snag-free level finish to the assembly.
Truss or Mushroom Head: Truss head screws have a wider head providing a better joint and a lower profile finishing.
Go to the Slotted Machine Screws page.
Low Profile or Wafer Head Machine Screws
Low profile or wafer head screws are extremely suitable for tight spaces and for reducing component weight.
They are commonly used in laptops.
These screws are made from Steel with a Black Coating.
Go to the Low Profile Machine Screws page.
Wing Screws
Wing screws are designed to be tightened by hand.
They’re ideal for applications where frequent access is require or where tightness needs to be adjusted regularly.