Prefastenable torque-shear bolt

Details Prefastenable torque-shear bolt Prefastenable torque-shear bolt

1985-11-29

1987-04-21

Smith, Gary L.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Torque responsive nut or bolt driving connection

Frangible connection

411 43, 411410, F16B 3100

Patent

active

046592679

ABSTRACT:
A prefastenable torque-shear bolt has a bolt cut with a thread adapted to engage a nut, and full-fastening and prefastening grips each having wrench-engaging surfaces. One end of the bolt continues to a first transition portion that is tapered like a truncated cone. The full-fastening grip extends from the first transition portion and a full-fastening break-off groove. One end of the full-fastening grip continues to a second transition portion tapered like a truncated cone. The prefastening grip extends from the second transition portion and a prefastening break-off groove. The effective area of the fracture surface of the prefastening break-off groove is smaller than that of the full-fastening break-off groove. A first burr that arises on the threaded portion side when the full-fastening break-off groove is formed by rolling is formed on the first transition portion, and the outside diameter of the first burr is smaller than the diameter of the thread bottom in the threaded portion. A second burr that arises on the full-fastening grip side when the prefastening break-off groove is formed by rolling is formed on the second transition portion.

REFERENCES:
patent: 3129630 (1964-04-01), Wing et al.
patent: 3444775 (1969-05-01), Hills
patent: 4492500 (1985-01-01), Ewing

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