PRODUCT FAMILY COLLECTION

Special Threads & Shanks

Fine pitches, special profiles, modified tips and stepped or tapered shanks defined by the drawing.

Drawing and sample checks

Products	Application	What to specify	What to check
Fine & Extra-Fine Pitch Screws	Drawing-defined fine pitches support adjustment and engagement requirements where a standard selection does not fit.	Fine pitch alone does not guarantee resistance to loosening. Specify locking and vibration requirements separately.	Gauge after finishing and verify seating before bottoming.
Special & Compound Thread Profiles	Trapezoidal, buttress, high-low and compound thread arrangements require an explicit profile and matching part.	Self-locking depends on geometry, friction and operating conditions. Do not assume every trapezoidal or buttress thread is self-locking.	Agree a profile check and a separate functional trial.
Modified-Tip Self-Tapping Screws	Slotted, cut or relieved ends can be specified around the actual material and hole condition.	Cutting tips can generate chips. Debris and breakthrough control must be demonstrated in the actual assembly.	Trial installation in representative material and check the agreed torque limits.
Reduced & Variable Shank Screws	A reduced or stepped shank introduces a deliberate change in section between functional features.	A reduced shank does not automatically prevent cracking. Supply load and fatigue requirements for design review.	Verify final geometry and agree mechanical verification for the reduced section.
Tapered Shank & Cone Screws	A defined taper or conical surface establishes a locating, contact or sealing interface with a matching component.	Sealing performance requires a matched design and verification; a taper alone does not establish leak tightness.	Check contact and seated depth in the matching seat.