Thread Rod 352

QS Fastener: Yuyao Thread Rod

Thread Rod 352 for joints tightened to a documented preload procedure.

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One-Minute Overview

Thread Rod 352: correct preload matters more than a nominal torque figure.
Lubrication and thread condition change the torque-tension relation.
Tighten in stages and in a cross pattern on multi-bolt joints.
Grade, coating and dimensions are confirmed per inquiry.

A bolted joint holds because the fastener is stretched to a controlled preload, not because a torque wrench reached a number. Friction in the threads and under the head can absorb most of the applied torque, so thread condition, lubrication and bearing surface all affect the result. Thread Rod 352 is supplied for joints tightened to the procedure in the assembly drawing; Qishine confirms the grade, coating and dimensions per inquiry and leaves the torque value to the project specification.

Name: Thread Rod 352
Note: Full dimensions and bolt pattern are confirmed per inquiry.

Start from the joint design: clamp load, number of fasteners, grip length and the mating nut and washer. Confirm the thread form and the strength grade against the standard, then decide whether a lubricant or a locking method is required. Grip length, coating thickness and any special thread treatment are confirmed per inquiry before the fastener is released.

Clean the threads, inspect for galling or deformation and verify the nut runs freely by hand. Seat the bearing faces square, apply the specified lubricant if the drawing calls for it, and tighten in a cross pattern in at least three increasing passes. Record the final torque, recheck after the first thermal cycle where the procedure requires it, and never reuse a fastener that has been yielded.

FAQ

Q1. Why is torque not the same as preload?

Most applied torque is spent overcoming friction in the thread and under the head; only part becomes useful clamp load. Lubrication, surface finish and thread condition change that split, so the assembly drawing governs the tightening procedure.

Q2. How should a multi-bolt flange be tightened?

In a cross or star pattern in several increasing passes, so the joint closes evenly and no single fastener is overloaded. A single pass straight around the flange cocks the joint and leaves uneven preload.

Q3. Can a fastener be reused after loosening?

It depends on the grade and whether it was taken past yield. A fastener that has been yielded, galled or exposed to high temperature should be replaced; reusing it risks losing clamp load in service.

Q4. What payment terms do you accept?

T/T, L/C at sight and other internationally accepted terms. The exact terms are agreed with you before production starts, because the payment schedule has to match the order value, the shipping method and the delivery schedule you need — which is also why we confirm them up front rather than after shipment.

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