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Shoulder screws, a type of machine screw, have threadings only on half or lower part of the screw shank and a partially smooth shaft for keeping the workpieces together. They permit full rotational movement and are widely used in linkages, pulleys and other moving parts in engines. Raptor Supplies offers shoulder screws from Accurate Mfd Products Group (AMPG), Grainger, Fabory, Camcar & Richard Manno Company.
Accurate Manufactured Products Shoulder Screws:
Camcar Shoulder Screws:
Provides higher corrosion resistance but lower hardness than stainless steel.
Structural rigidity prevents breaking under heavy stress while having higher corrosion resistance than stainless steel screws.
Ideal for applications requiring high strength & structural rigidity.
Features the highest strength to weight ratio compared to other metallic screws, while being lightweight & corrosion resistant.
Made of 17-4 PH, 303, 316 & 416-grade stainless steel for corrosion resistance in harsh environments.
Lightweight, corrosion-resistant & non-magnetic.
Lightweight and cheaper than those made of metallic materials.
Also known as tight tolerance shoulder screws. Shoulder diameter & length tolerances are far more exact than that of other variants. Selected models feature specialised tamperproof heads and a self-locking design to prevent accidental loosening or tampering.
General-purpose shoulder screws made according to ASME B18.3 and ASME B18.3.3 standards for Imperial and Metric sizes, respectively. Have high shoulder tolerance.
Cheaper than other coatings and provides light to medium corrosion resistance.
Have mild to high corrosion resistance in wet / outdoor environments.
Provides adhesion & hardness, as well as resists chipping.
Carried out on stainless steel screws to remove free iron & create a protective oxide layer that prevents corrosion.
Users should know the required shoulder specifications. Shoulder screws are generally identified by their shoulder diameter, length and thread size.
The thread size & length of a shoulder screw are lesser than the shoulder diameter & length, respectively. Thread neck, a space between the shoulder & the threads, allows the threaded component to seat flush with the screw. Users should avoid over-torquing the screw to avoid fracture or break at the thread neck.
The diameter of a screw head with a flat top is generally twice the head height and 30 to 50% larger than the shoulder diameter. They typically feature an undercut between the shoulder & the bottom of the head for flush mounting of components against the head.
The material of the chosen shoulder screw should have adequate tensile strength.
Knurled head screws or thumb grip style shoulder screws providing a positive grip for installing & removing shoulder screws by hand in light-duty applications.
Smooth head screws without ridges on their vertical head surface. Used in medium to heavy-duty applications where hand tightening of screws is not possible or is time-consuming.
Have a cylindrical head with an internal drive for preventing tampering and are ideal for applications having limited space to manoeuvre wrenches.
Have a drive mechanism on the top surface of the screw's shoulder for applications facing space constraints.
Feature a hexagonal head for applications that do not require countersinking.
Have a rounded / oval top and are used in metal or wood applications.
Sink into the countersunk holes and sit flush in materials upon fastening.
Feature a deep, six-point hole on the screw head that can be tightened / loosened using a hex driver or Allen key. Prevents the driver from slipping during installation / removal.
Can be tightened using a slotted driver. Tend to slip & strip the screw head if they are turned too tightly. Use hand tools rather than a powered screwdriver for installation / removal.
Tightened using a wrench, ratchet or female hex driver. Consume lesser force for tightening and can be easily loosened even if the screw is dirty, rusty or painted over, in comparison to internal drives that need a notch to hold on to.
Yes, shoulder screws are also known as shoulder bolts.
Shoulder screws are used to hold together objects in punch-and-die mechanisms, vacuum systems, pulleys, linkages and plastic-injection mold sets. They are widely used in applications that require a mounting pin, joint, shaft, dowel or pivot.