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07-20-2020, 08:47 PM | #21 |
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Re: 7/16-14 thread chaser
Pete,
Is class 2 anything special or is this a "normal" 7/16-14 tap that would come in a thread & die kit let's say? |
07-20-2020, 08:59 PM | #22 |
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Re: 7/16-14 thread chaser
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07-20-2020, 10:07 PM | #23 |
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Re: 7/16-14 thread chaser
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07-21-2020, 07:42 AM | #24 |
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Re: 7/16-14 thread chaser
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07-21-2020, 08:56 AM | #25 | |
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Re: 7/16-14 thread chaser
Quote:
I'm assuming you mean the type of tap that you might possibly purchase at a typical hardware store maybe?? Thanks, Gary in N.Y. P.S. It all boils down to the "H-limits" of each individual tap. Conventional hardware store taps are generally the H-3 series! For tighter threads you would use an H-1 or maybe an H-2? It all depends, the taps come as high as H-5's, maybe more, not 100% sure!
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07-21-2020, 02:05 PM | #26 | |
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Re: 7/16-14 thread chaser
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Quote:
Class of Threads, H Limits Classes Of Threads There are (3) established Classes of Thread, designated in the unified series by adding: "A" for Screws and "B" for Nuts (or other intenal threads) to show definite limits and tolerances. Class 1B Thread Is wherea 1A screw can run in readily for quick and easy assembly. The hole is classified as 1B. The fit is a 1B thread, (very seldom used in modern metal working) Class 2B Thread Consists of a 2A screw in a 2B hole. 2B thread has wide applications. It is used to accomodate plating, finishing and coating to a limited extent and threfore, has fair tolerance allowances. Class 3B Thread 3A screw in a 3B nut or internal threaded hole, used where tolerance limits are close. GH Numbers GH Numbers are listed below. "G" designates Ground Thread. "H" designates the pitch diameter is on high side of basic. These two letters (GH) are followed by a numeral indicating the Tolerance of Pitch diameter oversize. H1 = Basic to Plus .0005 H2 = Basic Plus .0005 to Plus .0010 H3 = Basic Plus .0010 to Plus .0015 H4 = Basic Plus .0015 to Plus .0020 H5 = Basic Plus .0020 to Plus .0025 H6 = Basic Plus .0025 to Plus .0030 H=Above Basic H7 = Basic Plus .0030 to Plus .0035 L=Below Basic |
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07-21-2020, 02:22 PM | #27 |
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Re: 7/16-14 thread chaser
This thread got complicated. 8^) Jack E/NJ
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07-21-2020, 03:56 PM | #28 |
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Re: 7/16-14 thread chaser
yuc, yuc, !
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07-21-2020, 07:15 PM | #29 |
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Re: 7/16-14 thread chaser
I'm staying with my incredibly well modified 8Ba head bolt with 5 (not 4) carefully filed grooves in it. It has served me well for the last 20 years and I'm stickin' with it.
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07-21-2020, 09:30 PM | #30 | |
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Re: 7/16-14 thread chaser
Quote:
Does anyone know where to get a 7/16-14 H1 rated tap? A quick Google search did not find any places that sell them. Now I want one. |
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07-23-2020, 06:59 PM | #31 |
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Re: 7/16-14 thread chaser
Thanks to Pete again for setting us straight on the #2 class fit threads can cleaned with the proper class thread tap.
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