Parafuso de Cabeça Quadrada – Série Polegada


REFERÊNCIA
ASME B18.2.1 – 1996
(Tabela 1)

Parafuso de Cabeça Quadrada - Série Polegada
Diâmetro nominalEFGHRLT
L < ou = 6 " L > 6 "
máx.máx.min.máx.minmaxminmáx.min.basicobasico
1/4"6.6049.5259.19413.46212.6494.7753.9620.7620.25419.0525.4
5/16"8.22912.712.29417.95716.8915.5884.7240.7620.25422.22528.575
3/8"9.85514.27413.81720.19318.9736.8075.8920.7620.25425.431.75
7/16"11.4815.87515.31622.45321.0318.0267.0610.7620.25428.57534.925
1/2"13.08119.0518.41526.94925.2738.8397.8230.7620.25431.7538.1
5/8'16.30623.82523.01233.6831.59711.27710.161.5240.50838.144.45
3/4"19.50728.57527.63540.41137.94713.30612.091.5240.50844.4550.8
7/8"22.73333.32432.23247.14244.24615.74814.4271.5240.50850.857.15
1"25.95838.136.8353.87350.57117.37315.9512.2860.76257.1563.5
1.1/8"29.18442.87541.42760.60456.8719.81218.2882.2860.76263.569.85
1.1/4"32.43547.62546.02467.3663.2222.2520.6242.2860.76269.8576.2
1.3/8"35.66152.37450.64774.09169.54523.87622.1482.2860.76276.282.55
1.1/2"38.88757.1555.24580.82275.84426.31424.4852.2860.76282.5588.9

TOLERÂNCIA PARA COMPRIMENTOS "L"

Comprimento NominalDiâmetro Nominal
1/4" a 3/8"7/16" e 1/2"9/16"a 3/4"7/8" e 1"1.1/8" a 1.1/2"Acima de 1.1/2"
Até1"0.5080.5080.508---------------------------
-0.762-0.762-0.762
Acima de 1"até 2.1/2"0.5081.0161.5242.0323.0484.572
-1.016-1.524-2.032-2.54-3.048-4.572
Acima de 2.1/2"até 4" 1.0161.5242.0322.544.0645.08
-1.524-2.032-2.54-3.556-4.064-5.08
Acima de 4" até 6"1.5242.0322.543.0484.5725.588
-2.54-2.54-2.54-4.064-4.572-5.588
Acima de 6"2.543.0483.5564.0645.5886.096
-4.572-4.572-4.572-5.08-5.588-6.096

OBS: ROSCAS: Especificar – UNC/UNF/8UN/BSW/BSF.