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(Non-preferred) dimensions in parentheses.

Unit:inch

Unified Hexagon lock nuts - Heavy Series

BS 1769 - 1951

Display drawing:

英标BS 1769 - 1951 BS1769 1769BS Unified Hexagon lock nuts - Heavy Series
Screw Thread
d
1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 (1-3/8) 1-1/2 1-3/4 2
PP UNC
UNF
s max
min
e max
k As forged max
min
Faced max
min
13 11 10 9 8 7 7 6 6 5 4-1/2
20 18 16 14 12 12 12 12 12 - -
0.8750 1.0625 1.2500 1.4375 1.6250 1.8125 2.0000 2.1875 2.3750 2.7500 3.1250
0.8550 1.0375 1.2250 1.4075 1.5950 1.7825 1.9550 2.1425 2.3300 2.6900 3.0650
1.01 1.23 1.44 1.66 1.88 2.09 2.31 2.53 2.74 3.18 3.61
0.332 0.397 0.462 0.526 0.590 0.655 0.782 0.846 0.911 1.040 1.169
0.292 0.353 0.414 0.474 0.534 0.595 0.718 0.778 0.839 0.960 1.081
0.317 0.381 0.446 0.510 0.575 0.639 0.751 0.815 0.880 1.009 1.138
0.277 0.337 0.398 0.458 0.519 0.579 0.687 0.747 0.808 0.929 1.050
①,screw threads:
For bolts and screws as forged or faced under the head, and for nuts as forged, the screw threads shall be Unified Coarse (UNC) in accordance with BS 1580, "Unified screw threads", as specified by the purchaser.
For bolts and screws faced under the head and machined on the shank and for machined nuts the screw threads shall be Unified Coarse (UNC), Unified Fine (UNF) in accordance with BS 1580, "Unified screw threads", as specified by the purchaser.
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