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.
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
