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A technician is organizing standard steel fasteners by their load-bearing capacity. Arrange the following SAE hex cap bolts in order of their tensile strength, from lowest strength to highest strength.

  1. 1Bolt with a plain head and no radial lines stamped on it (SAE Grade 2)
  2. 2Bolt with 3 radial lines stamped on the head (SAE Grade 5)
  3. 3Bolt with 5 radial lines stamped on the head (SAE Grade 7)
  4. 4Bolt with 6 radial lines stamped on the head (SAE Grade 8)

Cevap

From lowest to highest tensile strength: Bolt with no radial lines (SAE Grade 2), Bolt with 3 radial lines (SAE Grade 5), Bolt with 5 radial lines (SAE Grade 7), and Bolt with 6 radial lines (SAE Grade 8).
SAE steel bolt strength is designated by radial lines stamped on the bolt head. The formula to find the grade is the number of radial lines plus 2. A plain bolt head with no lines designates SAE Grade 2 (~74,000 psi minimum tensile strength). A bolt head with 3 radial lines indicates SAE Grade 5 (3 + 2 = 5, ~120,000 psi). A bolt head with 5 radial lines indicates SAE Grade 7 (5 + 2 = 7, ~133,000 psi). A bolt head with 6 radial lines indicates SAE Grade 8 (6 + 2 = 8, ~150,000 psi). Therefore, the correct order from weakest to strongest is Grade 2 (no lines), Grade 5 (3 lines), Grade 7 (5 lines), and Grade 8 (6 lines).

Adım Adım Çözüm

1
Identify the standard rule for determining SAE bolt grades from radial head markings.
The SAE grade equals the number of radial slash lines stamped on the bolt head plus 2 (Grade=radial lines+2\text{Grade} = \text{radial lines} + 2). A head with no markings corresponds to Grade 2.
Understanding head marking standards is essential for determining fastener strength and load capacity.
2
Calculate the grade and relative tensile strength for each fastener.
No lines = Grade 2 (~74,000 psi); 3 lines = Grade 5 (120,000 psi); 5 lines = Grade 7 (133,000 psi); 6 lines = Grade 8 (150,000 psi).
Tensile strength increases directly with higher SAE grade numbers.
3
Sequence the fasteners from lowest tensile strength to highest tensile strength.
Order: Grade 2 (no lines) < Grade 5 (3 lines) < Grade 7 (5 lines) < Grade 8 (6 lines).
Proper sequencing ensures hardware meets structural and mechanical requirements without risking joint failure.

Anahtar Kavram

SAE Bolt Grade Identification and Relative Tensile Strength
Tahmini Süre:45s
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