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Threads and Fasteners
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Thread Terminology
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Thread Callouts - Metric
(mm) (mm) (mm)
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Thread Callouts – ANSI Unified
1 – loosest fit 2 – normal fit 3 – most exact fit B represents internal thread (in) UNC – Unified National Course UNF – Unified National Fine UNEF – Unified National Extra Fine UN – Unified National
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Thread Callouts – ANSI Unified
Assumes course threads with a nominal fit (2). (in)
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Goal: connect the top part to the bottom part using a .75” long #10-24 cap screw which has a head taper of 82˚
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Steps: buy the screw drill a countersunk hole without threads into the top part drill a threaded hole in the bottom part
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2 things to know if you tap a hole
the thread length should be at least twice the diameter of the hole if you use a bolt to connect some bodies the bolt should extend beyond the nut by at least two thread pitches
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Was able to download a SolidWorks part file of this cap screw.
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Use ‘hole wizard’ to place a tapered hole, through all, for a #10 flat head screw with an 82˚ head taper.
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Note that the major diameter of a #10 screw is 0
Note that the major diameter of a #10 screw is 0.19” so we have clearance.
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Use ‘hole wizard’ to place a tapped hole for a #10-24 screw.
I selected a hole depth of 0.51” and a threaded depth of 0.38” (typically there should be at least 2 dia. of thread, i.e. at least 0.38” of thread).
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This is the ‘default’ drawing after inserting dimensions from part file.
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This is the ‘default’ drawing after inserting dimensions from part file.
delete this one hide this one Add the hole callout.
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Design Library Tools -> Add in -> SolidWorks Toolbox
SolidWorks Toolbox Browser
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Assembly with washers Select a 3/8-24 bolt to connect the parts.
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Assembly with washers and nut
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Determining Bolt Length
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Bolt length calculation
Bolt must be 1.92” long plus the distance of 2 extra pitches. The bolt has 24 threads per inch. Two extra pitches will require an extra 1/12” of an inch. Total minimum length is = 2.003” . Find the next longest available bolt.
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Smart Fasteners
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2 things to remember if you tap a hole
the thread length should be at least twice the diameter of the hole if you use a bolt to connect some bodies the bolt should extend beyond the nut by at least two thread pitches
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