HT (Whitworth Threads) | Hand Taps | YAMAWA

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HT (Whitworth Threads)

Product Features

Suitable for workpiece materials where the chips are powdery or where the chips are produced as a small curl.
The cutting edge strength is high.
It is easy to resharpen.

Working part of the cutting chamfer

The tap cuts an internal thread with the chamfer section.
The chamfer section is tapered towards the tip to facilitate cutting into a prepared hole.
Since the cutting chamfer portion of the tap has incomplete threads, the tapped internal
threads also have imperfect threads as shown on the right.
(Please be aware that the component will not have perfect threads unless all of the chamfer
portion is passed through the designated thread length.)

Difference in length of chamfer portion.

	The cutting chamfer length of the taper tap is 9 threadslong. The taper tap is used first because the long chamfer gradually cuts the full thread height easily with a small metal removal per thread pitch. However, in blind holes, the nine thread chamfer portion leaves a large number of incomplete threads that must be removed with a different tap. When tapping a through hole the full cutting chamfer length can be fed through the hole to complete all the threads.
	The cutting chamfer length of a plug (middle) tap is 5 threads long. The plug (middle) tap is used after a taper tap to lengthen the number of full threads in a blind hole. The plug (middle) tap will produce 5 incomplete threads. When tapping a blind hole, the taps are used in the order of a taper tap → a plug (middle) tap and → a bottom tap. The plug tap is used after the taper tap and before the bottom tap. The plug tap can be used as a starter tap if necessary.
	The cutting chamfer length of a bottom tap is 1.5 threads long. The bottom tap is used after the plug (middle) tap to lengthen the number of full threads in a blind hole. The bottom tap is difficult to use manually to start the thread cutting process. The bottom tap can create full threads to within 1.5 threads of the bottom of a blind hole.

In the past, it was common for hand taps to be used manually in sets of three chamfer lengths (taper, plug (middle) and bottom)
for the same diameter and pitch thread. Today, most methods of thread processing on tapping machines, drilling machines, CNC
machines and special machines allow for the use of just one type of tap chamfer length to be used that best suits the components
requirements. This saves time while producing quality threads with just one tap. Therefore, due to the decrease in demands for the
taper tap, YAMAWA stopped production of taper taps in March 2013.

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HT (Whitworth Threads) | Hand Taps | YAMAWA

Details

Specification

Tapping Speeds depending on Materials

Oversize

Segment：1A

Size	Class	Code	Chamfer	L (mm)	ℓ (mm)	ℓn (mm)	ℓs (mm)	Ds (mm)	K (mm)	ℓk (mm)	No. of flutes	TYPE
For Whitworth Threads
1/16W60	P2	TNMQW01-5	5P	36	6.3	-	24	3	2.5	5	3	2
1/16W60	P2	TNMQW01-1	1.5P	36	6.3	-	24	3	2.5	5	3	2
3/32W48	P2	TNMQW1HF5	5P	46	8.1	14	28	3	2.5	5	3	3
3/32W48	P2	TNMQW1HF1	1.5P	46	8.1	14	28	3	2.5	5	3	3
1/8W40	P2	TNMQW02H5	5P	52	11	16	28	5	4	7	3	3
1/8W40	P2	TNMQW02H1	1.5P	52	11	16	28	5	4	7	3	3
5/32W32	P2	TNMQW2HJ5	5P	52	11	17	29	5	4	7	4	3
5/32W32	P2	TNMQW2HJ1	1.5P	52	11	17	29	5	4	7	4	3
3/16W24	P3	TNMRW03M5	5P	60	13	21	32	5.5	4.5	7	4	3
3/16W24	P3	TNMRW03M1	1.5P	60	13	21	32	5.5	4.5	7	4	3
7/32W24	P3	TNMRW3HM5	5P	62	15	26	32	6	4.5	7	4	3
7/32W24	P3	TNMRW3HM1	1.5P	62	15	26	32	6	4.5	7	4	3
1/4W20	P3	TNMRW04N5	5P	62	15	26	33	6	4.5	7	4	3
1/4W20	P3	TNMRW04N1	1.5P	62	15	26	33	6	4.5	7	4	3
5/16W18	P3	TNMRW05O5T	5P	70	19	-	36	6.2	5	8	3	6
5/16W18	P3	TNMRW05O1T	1.5P	70	19	-	36	6.2	5	8	3	6
5/16W18	P3	TNMRW05O5	5P	70	19	-	36	6.2	5	8	4	6
5/16W18	P3	TNMRW05O1	1.5P	70	19	-	36	6.2	5	8	4	6
3/8W16	P3	TNMRW06P5	5P	75	23	-	38	7	5.5	8	4	6
3/8W16	P3	TNMRW06P1	1.5P	75	23	-	38	7	5.5	8	4	6
7/16W14	P4	TNMSW07Q5	5P	82	26	-	42	8.5	6.5	9	4	6
7/16W14	P4	TNMSW07Q1	1.5P	82	26	-	42	8.5	6.5	9	4	6
1/2W12	P4	TNMSW08S5	5P	88	26	-	45	10.5	8	11	4	6
1/2W12	P4	TNMSW08S1	1.5P	88	26	-	45	10.5	8	11	4	6
9/16W12	P4	TNMSW09S5	5P	95	26	-	48	12.5	10	13	4	6
9/16W12	P4	TNMSW09S1	1.5P	95	26	-	48	12.5	10	13	4	6
5/8W11	P4	TNMSW10U5	5P	95	26	-	48	12.5	10	13	4	6
5/8W11	P4	TNMSW10U1	1.5P	95	26	-	48	12.5	10	13	4	6
3/4W10	P4	TNMSW12V5	5P	105	33	-	50	15	12	15	4	8
3/4W10	P4	TNMSW12V1	1.5P	105	33	-	50	15	12	15	4	8
7/8W9	P5	TNMTW14W5	5P	115	33	-	55	17	13	16	4	8
7/8W9	P5	TNMTW14W1	1.5P	115	33	-	55	17	13	16	4	8
1 W8	P5	TNMTW16X5	5P	125	39	-	58	19	15	18	4	8
1 W8	P5	TNMTW16X1	1.5P	125	39	-	58	19	15	18	4	8
1 1/8W7	P5	TNMTW18Y5	5P	135	46	-	62	23	17	20	4	8
1 1/8W7	P5	TNMTW18Y1	1.5P	135	46	-	62	23	17	20	4	8
1 1/4W7	P5	TNMTW20Y5	5P	145	46	-	67	24	19	22	4	8
1 1/4W7	P5	TNMTW20Y1	1.5P	145	46	-	67	24	19	22	4	8
1 3/8W6	P6	TNMUW22Z5	5P	155	52	-	71	28	21	24	4	8
1 3/8W6	P6	TNMUW22Z1	1.5P	155	52	-	71	28	21	24	4	8
1 1/2W6	P6	TNMUW24Z5	5P	165	52	-	76	30	23	26	4	8
1 1/2W6	P6	TNMUW24Z1	1.5P	165	52	-	76	30	23	26	4	8
1 5/8W5	P6	TNMUW2605	5P	175	59	-	81	32	26	30	4	8
1 5/8W5	P6	TNMUW2601	1.5P	175	59	-	81	32	26	30	4	8
1 3/4W5	P6	TNMUW2805	5P	180	59	-	83	35	26	30	4	8
1 3/4W5	P6	TNMUW2801	1.5P	180	59	-	83	35	26	30	4	8
1 7/8W4 1/2	P6	TNMUW3095	5P	185	65	-	85	38	29	32	4	8
1 7/8W4 1/2	P6	TNMUW3091	1.5P	185	65	-	85	38	29	32	4	8
2 W4 1/2	Ⅱ	TH2W3295	5P	195	92	-	-	40	32	35	4	10
2 W4 1/2	Ⅱ	TH2W3291	1.5P	195	92	-	-	40	32	35	4	10
2 1/4W4	Ⅱ	TH2W3685	5P	210	100	-	-	44	35	38	4	10
2 1/4W4	Ⅱ	TH2W3681	1.5P	210	100	-	-	44	35	38	4	10
2 1/2W4	Ⅱ	TH2W4085	5P	225	105	-	-	48	38	42	4	10
2 1/2W4	Ⅱ	TH2W4081	1.5P	225	105	-	-	48	38	42	4	10
2 3/4W3 1/2	Ⅱ	TH2W4475	5P	240	115	-	-	55	41	44	4	10
2 3/4W3 1/2	Ⅱ	TH2W4471	1.5P	240	115	-	-	55	41	44	4	10
3 W3 1/2	Ⅱ	TH2W4875	5P	250	120	-	-	58	46	50	4	10
3 W3 1/2	Ⅱ	TH2W4871	1.5P	250	120	-	-	58	46	50	4	10
3 1/4W3 1/4	Ⅱ	TH2W52-5	5P	265	125	-	-	58	46	50	6	10
3 1/4W3 1/4	Ⅱ	TH2W52-1	1.5P	265	125	-	-	58	46	50	6	10
3 1/2W3 1/4	Ⅱ	TH2W56-5	5P	275	130	-	-	60	46	50	6	10
3 1/2W3 1/4	Ⅱ	TH2W56-1	1.5P	275	130	-	-	60	46	50	6	10
3 3/4W3	Ⅱ	TH2W6065	5P	285	135	-	-	65	50	52	6	10
3 3/4W3	Ⅱ	TH2W6061	1.5P	285	135	-	-	65	50	52	6	10
4 W3	Ⅱ	TH2W6465	5P	295	135	-	-	65	50	52	6	10
4 W3	Ⅱ	TH2W6461	1.5P	295	135	-	-	65	50	52	6	10

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HT (Whitworth Threads) | Hand Taps | YAMAWA

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