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HK 1-8 SOCKET
Unit of Measure
1 

Item #

Item Name

Body Size

ISO Size

Thread Size NPTF

Thread Size BSPP

Thread Size SAE

Dim. - A

Dim.- B

Across Flats

1H11 N/A 1H11 N/A 1/8 in N/A 5 mm N/A 1/8-27 N/A N/A N/A 1.91 in48.5 mm N/A 0.98 in24.9 mm N/A 0.56 inches14.2 mm
1H4 N/A 1H4 N/A 0 1/8 in N/A 5 mm N/A N/A N/A 7/16-20 N/A 2.06 in52.3 mm N/A 0.98 in24.9 mm N/A 0.69 inches17.5 mm
2H16 N/A 2H16 N/A 0 1/4 in N/A 6.3 mm N/A 1/4-18 N/A N/A N/A 2.26 in57.4 mm N/A 1.14 in29 mm N/A 0.75 inches19.1 mm
2H16BS N/A 2H16BS N/A 0 1/4 in N/A 6.3 mm N/A N/A 1/4-19 N/A N/A 2.31 in58.7 mm N/A 1.14 in29 mm N/A 0.75 inches19.1 mm
2H6 N/A 2H6 N/A 0 1/4 in N/A 6.3 mm N/A N/A N/A 9/16-18 N/A 2.40 in61 mm N/A 1.14 in29 mm N/A 0.88 inches22.4 mm
3H21 N/A 3H21 N/A 0 3/8 in N/A 10 mm N/A 3/8-19 N/A N/A N/A 2.56 in65 mm N/A 1.42 in36.1 mm N/A 0.88 inches22.4 mm
3H21BS N/A 3H21BS N/A 0 3/8 in N/A 10 mm N/A N/A 3/8-19 N/A N/A 2.56 in65 mm N/A 1.42 in36.1 mm N/A 0.88 inches22.4 mm
3H8 N/A 3H8 N/A 0 3/8 in N/A 10 mm N/A N/A N/A 3/4-16 N/A 2.74 in69.6 mm N/A 1.42 in36.1 mm N/A 1 inches25.4 mm
4HP26 N/A 4HP26 N/A 0 1/2 in N/A 12.5 mm N/A 1/2-14 N/A N/A N/A 2.96 in75.2 mm N/A 1.86 in47.2 mm N/A 1.13 inches28.7 mm
4HP26BS N/A 4HP26BS N/A 0 1/2 in N/A 12.5 mm N/A N/A 1/2-14 N/A N/A 2.96 in75.2 mm N/A 1.86 in47.2 mm N/A 1.13 inches28.7 mm
4HP10 N/A 4HP10 N/A 0 1/2 in N/A 12.5 mm N/A N/A N/A 7/8-14 N/A 3.05 in77.5 mm N/A 1.86 in47.2 mm N/A 1.25 inches31.8 mm
6HP31 N/A 6HP31 N/A 0 3/4 in N/A 20 mm N/A 3/4-14 N/A N/A N/A 3.48 in88.4 mm N/A 2.22 in56.4 mm N/A 1.31 inches33.3 mm
6HP31BS N/A 6HP31BS N/A 0 3/4 in N/A 20 mm N/A N/A 3/4-14 N/A N/A 3.48 in88.4 mm N/A 2.22 in56.4 mm N/A 1.31 inches33.3 mm
6HP12 N/A 6HP12 N/A 0 3/4 in N/A 20 mm N/A N/A N/A 1 1/16-12 N/A 3.67 in93.2 mm N/A 2.22 in56.4 mm N/A 1.38 inches35.1 mm
8HP36 N/A 8HP36 N/A 1 in N/A 25 mm N/A 1-11 1/2 N/A N/A N/A 4.13 in104.9 mm N/A 2.61 in66.3 mm N/A 1.75 inches44.4 mm
8HP36BS N/A 8HP36BS N/A 1 in N/A 25 mm N/A N/A 1-11 N/A N/A 4.13 in104.9 mm N/A 2.61 in66.3 mm N/A 1.75 inches44.5 mm
8HP16 N/A 8HP16 N/A 1 in N/A 25 mm N/A N/A N/A 1 5/16-12 N/A 4.13 in104.9 mm N/A 2.61 in66.3 mm N/A 1.88 inches47.8 mm
Unit of Measure
1