Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Headed bolt or screw with threads and complementary nut
Patent
1986-04-01
1989-06-27
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Headed bolt or screw with threads and complementary nut
411411, 411436, F16B 3500
Patent
active
048424668
ABSTRACT:
An aerospace fastener comprises a bolt with a roll formed thread, and a nut with a similar thread having a uniform pitch P. The bolt has a cylindrical shank, a threaded tip and a run-out zone between the shank and tip. In the run-out, which is no longer than 2P, and in preferred embodiments is in the range of from 1.6P to 1.9P, the root of the roll formed bolt thread increases diameter continuously from the minor diameter of the tip thread to the diameter of the shank. The nut has a conical run-in truncating the crest of the nut thread parallel to the run-out to clear the root of the bolt thread when the nut is assembled on the bolt in the minimum grip condition. This permits the nut to be assembled on the bolt further than in a conventional combination, and shortening of the nut and bolt to save weight. Preferably the crest of the bolt thread is at the major diameter of the tip thread at distances beyond 0.75P from the maximum grip plane of the bolt.
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Military Specification MIL-B-7838B, Apr. 20, 1962, pp. 1 to 4.
Military Specification MILS-8879A, Dec. 8, 1965, pp. 1 to 10.
Rath Jack
Wheeler Roland A.
VSI Corporation
Wilson Neill
LandOfFree
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