Coarse thread

What's coarse thread? The so-caφ&✔lled rough teeth are actually refers∞φ∑α to the standard thre×"↕ad, in the absence of special instruδλ↓♦ctions, we generally b♥‌uy stainless steel screws and ot₽•→her fasteners are rough teeth.

it has high strength, good ≤φ©±interchangeability, and the£"₹$ standard can be compare λd. Generally speaking, coarse thr₩™↓↔ead should be the best ch₩λ<oice. Ratio with fine thread: d≤™ue to the large pitch, the thread<↕÷♠ Angle is also large, self-locki→★₽ng is poor, in the vibration enφσεvironment need to addπ≥ε≠ anti-loose washer, ↔★±$self-locking device; The adv↓Ω♠βantages are convenient disa≤εssembly and installation, complete s‌♦≤tandard parts, easy to exchange;

Fine pitch thread

Fine teeth and coarse teeth are on∑♣ ≥ the contrary, in order to∏✔÷♥ supplement the coarse teeth thread can<ε‍& not meet the special use requiremen∑↔ts and specified, fine teeth thread a→​‍lso has pitch series λ♥, fine teeth pitch is smaller, so it is more conduci✔¥¶ ve to self-locking, anti-l¥φoose, and the number of teeth, can re≤♥duce the effect of leakage, to achie<♥↔≈ve the effect of sealing. In some©© precision occasions, fine ¥₹¥ tooth stainless steel screw more convenient preciφ®★se control, adjustment.
The tensile value, strength is lower ☆±$than the rough teeth,₩δ$ and the thread is easy σ‌ to damage, it is not recommended t☆φε<o disassemble multiple ♥δ♦δtimes, the matching nut and ♥™βother fasteners may be as accurate,®© the size of a little error, eaβ<sy to screw nut damage.
Fine pitch thread is mainly used ♠¶in the metric pipe fittings of hyd‍•raulic system, mechanical transmissio★‍§★n parts, thin wall parts with ins♣↔€ufficient strength, machinΩεe parts limited by spac✘©αe and shaft with higher ≈ self-locking requirements, etc. The'♠ pitch of fine thread>Ω÷  must be marked to distinguish i ×t from coarse thread.