The primary duty of Trapezoidal (Metric ACME-Type) Threaded Rods is a trapezoidal threaded rod that converts rotation to linear motion under load. Below: the sectors that specify them in volume, the checklist used to select the right size and material for the application, installation notes, and the known limits of the type. Stocked across roughly 8 to 300, they cover general to heavy-duty work.
Typical Applications for Trapezoidal (Metric ACME-Type) Threaded Rod
The most common settings where these are specified:
- Machine tools: manual slides and feed screws.
- Presses and vices: screw drives that hold load when stopped.
- Lifting equipment: screw jacks and adjusters.
- Valve actuation: rising-stem gate valves.
How to Specify Trapezoidal (Metric ACME-Type) Threaded Rod for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans 8–300; check the full table below for the exact dimensions of each size.
- Strength class: Choose the property class (e.g. 8.8, 10.9, 12.9 or A2/A4 stainless) for the load and environment, and tighten to the matching torque so the joint relies on preload, not friction.
- Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- Standard: This product is supplied to DIN 103. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Installation & Assembly Practice
- Tighten to the torque for the size and property class with a calibrated wrench — the joint is held by preload, not by the thread friction alone.
- Ensure at least one full thread projects beyond the nut after tightening, and never re-use a bolt that has been tightened into yield.
- Under slotted or oversized holes, fit a hardened washer so the preload does not relax into the hole edge.
Common Selection Mistakes with Trapezoidal (Metric ACME-Type) Threaded Rod
- Specifying class 12.9 "to be safe" in a corrosive environment — high classes are more sensitive to hydrogen embrittlement and stress corrosion; 8.8 hot-dip galvanized often outlasts them outdoors.
- Choosing a length that puts the shear plane through the threaded portion when a plain shank (partially threaded bolt) was available.
- Mixing stainless bolts with plated-steel nuts: the joint loses its corrosion logic and can gall or seize.
Where Trapezoidal (Metric ACME-Type) Threaded Rod Are Not the Right Choice
Not for permanent joints that will never be opened (a rivet or weld is cheaper), and not where the head must sit flush — use a countersunk screw instead.
Custom manufacturing · Made to drawing
Need a trapezoidal (metric acme-type) threaded rod outside the standard range?
A non-standard bolt is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
