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İzodem Civata - Özel İmalat Somun Civatalar
Civata Dayanım Sınıfları
3.6 4.6 4.8 5.6 5.8 6.6 6.8 6.9 8.8 10.9 12.9 14.9

Civata dayanım sınıfları iki sayıdan oluşur.

- İlk rakam; civata malzemesinin N/mm² cinsinden çekme dayanımının 1/100'ü,
- İki rakamın çarpımı; civata malzemesinin N/mm² cinsinden akma dayanımının 1/10'udur.

Örnek olarak 6.8 dayanım sınıfı için;

- Çekme Dayanımı (σk) = 6 x 100 = 600 N/mm²
- Akma Dayanımı (σAk) = 6 x 8 x 10 = 480 N/mm²
Somun Dayanım Sınıfları
4 5 6 8 10 12 14

Somun dayanım sınıfları tek sayıdan oluşur ve civata malzemesinin N/mm² cinsinden çekme dayanımının 1/100'ünü ifade eder.

Örneğin dayanım sınıfı 8 olan bir somunun çekme dayanımı: 8 x 100 = 800 N/mm² olur.

Bağlantı elemanları seçiminde, somun dayanım sınıfı, civata dayanım sınıfına denk olmalıdır. Yani 5.8 kalite civata için 6 kalite somun uygundur. 10.9 kalite civata ile 10 kalite somun kullanılmalıdır, 8 kalite veya daha düşük dayanım sınıfına sahip bir somun kullanmak ise yanlıştır.
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