SIT (Unified Threads) | Simple Thread Inspection Tools | YAMAWA

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SIT (Unified Threads)

Specification of SIT is available up to M48 (U1 3/4). For details, please contact us.

Product Features

SIT is a simple thread inspection tool that allows you to easily check internal threads on your production line.
The blue color is used to indicate "GO", while the red color is used for "Not Go" for easy identification and storage.
Utilizing a high grade of HSS material, the gauge life has increased significantly.
By using a stepped threads or tapered threads design at the front end of screw thread section, the problems in inspection were reduced while the work efficiency was improved. The tip of SIT gauge is easy to insert into an internal screw thread as the thread height gradually becomes larger. This is particularly effective when inspecting fine pitch threads.
Note: Stepped threaded design is not used for "Not Go".

Go and Not Go notations

SIT notations are as follows: GB (metric screw threads and unified screw threads) for GO, and NB (metric screw threads) and WB (unified screw threads) for NOT GO.

These notations conform to the "gauge symbol" of JIS standards.

Both metric screw threads and unified screw threads are manufactured in accordance with JIS standards. For a reference point: the metric screw threads have been specified to be consistent with ISO while the unified screw threads have been specified as it was before the introduction of ANSI standard.

Accuracy of SIT

The single pitch diameter tolerance, the thread pitch tolerance and the threads half angle tolerance are important in the internal thread accuracy measurement and are manufactured using the same accuracy of JIS-compliant thread plug gauges.

The screw thread precision is the same as a thread gauge, but some of the specifications like length of screw thread portion and the relief shape of the thread root are originated by YAMAWA. Therefore, these gauges are not to be called "thread gauge" and distinguished as "simple inspection tools for internal screw threads".

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SIT (Unified Threads) | Simple Thread Inspection Tools | YAMAWA

Details

Specification

Segment：7B

Size		Class	Code	L (mm)	ℓ (mm)	ℓn (mm)	ℓs (mm)	Ds (mm)	K (mm)	ℓk (mm)	TYPE
For Unified Threads
No.2-56UNC	GB	2B	ITM2UN2EG	42	4.5	12	26	3	2.5	5	1
No.2-56UNC	WB	2B	ITM2UN2EN	42	3.5	12	26	3	2.5	5	2
No.2-64UNF	GB	2B	ITM2UN2DG	42	4.5	12	26	3	2.5	5	1
No.2-64UNF	WB	2B	ITM2UN2DN	42	3.5	12	26	3	2.5	5	2
No.3-48UNC	GB	2B	ITM2UN3FG	46	6.5	14	28	3	2.5	5	1
No.3-48UNC	WB	2B	ITM2UN3FN	46	3.5	14	28	3	2.5	5	2
No.3-56UNF	GB	2B	ITM2UN3EG	46	6.5	14	28	3	2.5	5	1
No.3-56UNF	WB	2B	ITM2UN3EN	46	3.5	14	28	3	2.5	5	2
No.4-40UNC	GB	2B	ITM2UN4HG	46	6.5	14	25	4	3.2	6	1
No.4-40UNC	WB	2B	ITM2UN4HN	46	3.5	14	25	4	3.2	6	2
No.4-48UNF	GB	2B	ITM2UN4FG	46	6.5	14	25	4	3.2	6	1
No.4-48UNF	WB	2B	ITM2UN4FN	46	3.5	14	25	4	3.2	6	2
No.5-40UNC	GB	2B	ITM2UN5HG	52	6.5	16	28	5	4	7	1
No.5-40UNC	WB	2B	ITM2UN5HN	52	3.5	16	28	5	4	7	2
No.5-44UNF	GB	2B	ITM2UN5GG	52	6.5	16	28	5	4	7	1
No.5-44UNF	WB	2B	ITM2UN5GN	52	3.5	16	28	5	4	7	2
No.6-32UNC	GB	2B	ITM2UN6JG	52	7	17	27	5	4	7	1
No.6-32UNC	WB	2B	ITM2UN6JN	52	3.5	17	27	5	4	7	2
No.6-40UNF	GB	2B	ITM2UN6HG	52	7	17	27	5	4	7	1
No.6-40UNF	WB	2B	ITM2UN6HN	52	3.5	17	27	5	4	7	2
No.8-32UNC	GB	2B	ITM2UN8JG	60	9	22	31	5.5	4.5	7	1
No.8-32UNC	WB	2B	ITM2UN8JN	60	5	22	31	5.5	4.5	7	2
No.8-36UNF	GB	2B	ITM2UN8IG	60	9	22	31	5.5	4.5	7	1
No.8-36UNF	WB	2B	ITM2UN8IN	60	5	22	31	5.5	4.5	7	2
No.10-24UNC	GB	2B	ITM2UNAMG	60	9.5	22	32	5.5	4.5	7	1
No.10-24UNC	WB	2B	ITM2UNAMN	60	5	22	32	5.5	4.5	7	2
No.10-32UNF	GB	2B	ITM2UNAJG	60	9.5	22	32	5.5	4.5	7	1
No.10-32UNF	WB	2B	ITM2UNAJN	60	5	22	32	5.5	4.5	7	2
No.12-24UNC	GB	2B	ITM2UNCMG	62	9.5	26	32	6	4.5	7	1
No.12-24UNC	WB	2B	ITM2UNCMN	62	5	26	32	6	4.5	7	2
No.12-28UNF	GB	2B	ITM2UNCKG	62	9.5	26	32	6	4.5	7	1
No.12-28UNF	WB	2B	ITM2UNCKN	62	5	26	32	6	4.5	7	2
1/4-20UNC	GB	2B	ITM2U04NG	62	15	26	32	6	4.5	7	1
1/4-20UNC	WB	2B	ITM2U04NN	62	10	26	32	6	4.5	7	2
1/4-28UNF	GB	2B	ITM2U04KG	62	12	26	32	6	4.5	7	1
1/4-28UNF	WB	2B	ITM2U04KN	62	7	26	32	6	4.5	7	2
5/16-18UNC	GB	2B	ITM2U05OG	70	15	34	36	6.2	5	8	3
5/16-18UNC	WB	2B	ITM2U05ON	70	10	34	36	6.2	5	8	4
5/16-24UNF	GB	2B	ITM2U05MG	70	15	34	36	6.2	5	8	3
5/16-24UNF	WB	2B	ITM2U05MN	70	7	34	36	6.2	5	8	4
3/8-16UNC	GB	2B	ITM2U06PG	75	17	37	38	7	5.5	8	3
3/8-16UNC	WB	2B	ITM2U06PN	75	10	37	38	7	5.5	8	4
3/8-24UNF	GB	2B	ITM2U06MG	75	17	37	38	7	5.5	8	3
3/8-24UNF	WB	2B	ITM2U06MN	75	10	37	38	7	5.5	8	4
7/16-14UNC	GB	2B	ITM2U07QG	82	17	40	42	8.5	6.5	9	3
7/16-14UNC	WB	2B	ITM2U07QN	82	10	40	42	8.5	6.5	9	4
7/16-20UNF	GB	2B	ITM2U07NG	82	17	40	42	8.5	6.5	9	3
7/16-20UNF	WB	2B	ITM2U07NN	82	10	40	42	8.5	6.5	9	4
1/2-13UNC	GB	2B	ITM2U08RG	88	17	43	45	10.5	8	11	3
1/2-13UNC	WB	2B	ITM2U08RN	88	13	43	45	10.5	8	11	4
1/2-20UNF	GB	2B	ITM2U08NG	88	17	43	45	10.5	8	11	3
1/2-20UNF	WB	2B	ITM2U08NN	88	10	43	45	10.5	8	11	4
9/16-12UNC	GB	2B	ITM2U09SG	95	26	47	48	12.5	10	13	3
9/16-12UNC	WB	2B	ITM2U09SN	95	17	47	48	12.5	10	13	4
9/16-18UNF	GB	2B	ITM2U09OG	95	20	47	48	12.5	10	13	3
9/16-18UNF	WB	2B	ITM2U09ON	95	13	47	48	12.5	10	13	4
5/8-11UNC	GB	2B	ITM2U10UG	95	26	47	48	12.5	10	13	3
5/8-11UNC	WB	2B	ITM2U10UN	95	17	47	48	12.5	10	13	4
5/8-18UNF	GB	2B	ITM2U10OG	95	20	47	48	12.5	10	13	3
5/8-18UNF	WB	2B	ITM2U10ON	95	13	47	48	12.5	10	13	4

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