STRUCTURAL CAPACITIES OF GRADE A4 - 70 SPACED THREAD SCREWS TO AAMA TIR - A9 - 1991

TABLE S4. Allowable Shear and Bearing.

A(R) Allowable Bearing, Ba ≤ V (kN)

Nominal Allow.
Thread
Size Diameter, D Shear, V Aluminium 6063 T6 ply thickness, t (mm)
Root Area
(mm) 2 (kN)
(mm ) 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00 6.50 7.00 7.50 8.00 8.50 9.00 9.50 10.00
M3.5 3.50 2.96 0.48 0.58 0.87 1.16 1.45 1.74 2.03 2.32 2.61 2.90 3.19 3.47 3.76 4.05 4.34 4.63 4.92 5.21 5.50 5.79
M4.2 4.20 4.79 0.77 0.69 1.04 1.39 1.74 2.08 2.43 2.78 3.13 3.47 3.82 4.17 4.52 4.86 5.21 5.56 5.91 6.25 6.60 6.95
M4.8 4.80 6.39 1.03 0.79 1.19 1.59 1.99 2.38 2.78 3.18 3.57 3.97 4.37 4.77 5.16 5.56 5.96 6.35 6.75 7.15 7.54 7.94
M5.5 5.50 8.42 1.36 0.91 1.37 1.82 2.28 2.73 3.19 3.64 4.10 4.55 5.01 5.46 5.92 6.37 6.83 7.28 7.74 8.19 8.65 9.10
M6.3 6.30 13.03 2.11 1.04 1.56 2.08 2.61 3.13 3.65 4.17 4.69 5.21 5.73 6.25 6.78 7.30 7.82 8.34 8.86 9.38 9.90 10.42

TABLE S5. Allowable Tension and Pull - out.

Allowable Pull - out, Pa ≤ T (kN)

Nominal Size Allow.
N (Thread)
Size & Thread TensionT Aluminium 6063 T6 ply thickness, t (mm)
(mm)
(inch) (kN)
1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00 6.50 7.00 7.50 8.00 8.50 9.00 9.50 10.00
M3.5 #6 - 20 0.787 0.83 0.20 0.31 0.41 0.61 0.86 1.14 1.41 1.68 1.95 2.17 2.36 2.56 2.76 2.95 3.15 3.35 3.55 3.74 3.94
M4.2 #8 - 18 0.709 1.34 0.25 0.37 0.49 0.73 0.93 1.26 1.59 1.92 2.24 2.57 2.84 3.07 3.31 3.55 3.78 4.02 4.25 4.49 4.73
M4.8 #10 - 16 0.630 1.79 0.28 0.42 0.56 0.83 1.00 1.29 1.67 2.04 2.42 2.79 3.16 3.51 3.78 4.05 4.32 4.59 4.86 5.13 5.40
M5.5 #12 - 14 0.551 2.36 0.32 0.48 0.64 0.95 1.14 1.33 1.69 2.12 2.55 2.98 3.41 3.84 4.26 4.64 4.95 5.26 5.57 5.88 6.19
M6.3 #14 - 14 0.551 3.65 0.37 0.55 0.74 1.09 1.31 1.53 1.94 2.43 2.92 3.41 3.90 4.39 4.89 5.32 5.67 6.03 6.38 6.74 7.09

SCREW PROPERTIES : EQUATIONS :

Ultimate Tensile Strength, Fu = 700 N/mm
2
Pa = (1/3) [Ki π D t F ty] / 30.5 for 1.00 ≤ t ≤ 2/N ; Allowable Pull - out, Eq. 18 AAMA TIR - A9 - 1991
Yield Strength, Fy = 450 N/mm2 Pa = (1/3) [1.2D F ty (4/N - t) + 3.26D F tu (t - 2/N)] for 2/N < t < 4/N ; Allowable Pull - out, Eq. 19 AAMA TIR - A9 - 1991
Pa = (1/3) [0.9π D t F tu] / 30.5 for 4/N ≤ t ≤ 8 ; Allowable Pull - out, Eq. 20 AAMA TIR - A9 - 1991
ALUMINIUM 6063 T6 PROPERTIES : A (R) = 0.7854 (D - 1.2269/N) 2 ; Thread Root Area, Eq. 2 AAMA TIR - A9 - 1991
Bearing Yield Strength, Fby = 273 N/mm2 T = 0.40Fu A (R) for screw ; Allowable Tension
2
Ultimate Tensile Strength, Ftu = 206.85 N/mm V = 0.40Fu A (R) / 3 0.5 for screw ; Allowable Shear (Single)
2
Tensile Yield Strength, Fty = 172.37 N/mm Ba = Fby D t / 1.65 for aluminium ply ; Allowable Bearing, Eq. 6 AAMA TIR - A9 - 1991
Ki = 0.560 for 1.00 ≤ t ≤ 2.00
Ki = 0.665 for 2.00 ≤ t ≤ 2/N

NOTES :
- Italic bearing capacity values are greater than the shear capacity of the bolt, Hence, use minimum shear capacity of the bolt.
- Equations 18, 19, & 20 were taken from AAMA TIR - A9 - 1991 (2000 addendum).
- Allowable Shear & Bearing were taken from Table 27 ( Section D).
- Allowable Pull-out from Table 42 spaced thread screws.