美制螺纹规 UNIFIED PLUG, RING GAUGES 东莞市必途仪器有限公司

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产品名称：美制螺纹规
产品型号：UNIFIED PLUG, RING GAUGES
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美制螺纹规coventry[英国考文垂] UNIFIED PLUG, RING AND CALIPER THREAD GAUGES Gauges for testing Unified threads to BS 1580:Parts 1&2:1962, BS 1580:Part 3: 1965; and BS 919:Part 1:1960

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UNIFIED PLUG, RING AND CALIPER THREAD GAUGES

Gauges for testing Unified threads to BS 1580:Parts 1&2:1962,
BS 1580:Part 3: 1965; and
BS 919:Part 1:1960.
BS 1580: Pts 1&2:1962 specifies details of product threads. (The basic profile is the same as that for ISO threads as illustrated on page 4). The standard includes nominal sizes and limits of size for standard threads for 1A, 2A and 3A for external threads, and 1B, 2B, and 3B for internal threads in the following sizes:-
UNC
(coarse pitch) from 1/4” to 4” dia.
UNF
(fine pitch) from 1/4” to 11/2” dia.
UNEF
(extra fine pitch) from 1/4” to 111/16” dia.
UN
(constant pitch) for 4,6,8,12,16,20,28, and 32 tpi for various diameters as specified.
Allowances
(deviation from basic size)
1A and 2A provide allowances of 30% of the effective diameter tolerances of 2A external threads. 3A is basic (no allowance). 2AG is 0.001” smaller on diameter to provide for plating to finish at 2A. (0.001” on diameter will allow for an average deposit of 0.00025”). 1B, 2B and 3B for internal threads are all basic. Before plating threads are not designated. They are referred to as before plating, and are 0.001” larger on diameter than basic size.
Classes of fit
1A/lB are used where easy assembly is required. 2A/2B are the classes used for the majority of general engineering purposes. 3A/3B apply to threads requiring a closer fit, and are only used when a close accuracy of form and pitch are required.
BS 1580:Pt 3:1965 specifies nominal sizes and limits of size for standard threads for 2A and 3A for external threads, and 2B and 3B for internal threads for UNC, UNF, and UNEF for threads below 1/4” diameter. The allowances and classes of fit are the same as above.

BS 919:Pt 1:1960 specifies the limits for gauges for testing the product thread. The basis for determining the gauge limits is the diameter/pitch. Generally, the larger the diameter, and coarser the pitch, the larger the gauge limits within defined diameter/pitch bands.
The types of gauges used are the same as for ISO threads, described on page 4.

Gauges can be supplied to comply with the requirements of the American National Standards Institution specification ANSI/ASME B1.1 1989 for product threads, and B1.2 1983 for gauges.
The designated diameter/pitch combinations are similar to those in
BS 1580, with similar allowances and classes of fit. The gauging philosophy however in B1.2 differs from the British system. In the ANSI system generally the gauging limits are contained within the product tolerance, whereas in the British system the gauging limits may transgress the minimum material limit. Further, the ANSI standard specifies that the major diameter of the Not Go plug gauge is truncated to high addendum, whilst the British standard specifies low addendum truncation.
The regular checking of gauges in constant use is important, and should be carried out as for
ISO gauges.

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Screw Plugs	Screw rings	Calipers

Size	G0	NOGO	'E'	Go	NOGO		ROLLER		KNIFE
	Class of fit			Class of fit			Class of fit
	2B	2B	2B	2A		2A	ANY	ANY
No.1-64 UNC	0070	0071	0070B	0860		0861	1830	2030
NO.2-56 UNC	0072	0073	0072B	0862		0863	1831	2031
NO.3-48 UNC	0074	0075	0074B	0864		0865	1832	2032
NO.4-40 UNC	0076	0077	0076B	0866		0867	1833	2033
NO.5-40 UNC	0079	0080	0079B	0868		0869	1834	2034
NO.6-32 UNC	0081	0082	0081B	0870		0871	1835	2035
NO.8-32 UNC	0084	0085	0084B	0872		0873	1836	2036
****0-24UNC	0087	0088	0087B	0874		0875	1837	2037
****2-24UNC	0090	0091	0090B	0876		0877	1838	2038
1/4-20 UNC	0092	0093	0092B	0878		0879	1839	2039
5/16-18 UNC	0095	0096	0095B	0880		0881	1840	2040
3/8-16 UNC	0098	0099	0098B	0882		0883	1841	2041
7/16-14 UNC	0100	0101	0010B	0884		0885	1842	2042
1/2-13 UNC	0103	0104	0103B	0886		0887	1843	2043
9/16-12 UNC	0106	0107	0106B	0888		0889	1844	2044
5/8-11 UNC	0109	0110	0109B	0890		0891	1845	2045
3/4-10 UNC	0111	0112	0111B	0892		0893	1846	2045
7/8-9 UNC	0113	0114	0113B	0895		0896	1847	2046
1-8 UNC	0116	0117	0116B	0898		0899	1848	2047
1 1/8-7 UNC	0119	0120	0119B	0901		0902	1849	2048
1 1/4-7 UNC	0122	0123	0122B	0904		0905	1850	2049
1 3/8-6 UNC	0125	0126	0125B	0907		0908	1851	2050
1 1/2-6 UNC	0128	0129	0128B	0910		0911	1852	2052

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产品名称：美制螺纹规