CN - Primary Replacement Nut

CN Series Clamp Overview

JETYD, HYTORC Castle nut designed for tight quarter, spacing or bolt protrusion bolting commonly used in chemical processing facilities on boiler feed pumps and portal bolts.

The CN series clamp line covers a wide range of sizes and applications. The CN Series clamp was originally specified to replace fasteners that were operated with hydraulic bolt tensioners. The through bolt design of the CN Series clamp makes them an appropriate choice for applications with high stud extensions. The outside diameter of a CN Series clamp is approximately the cross corner dimension of a standard heavy hex nut.

CN Series clamps are typically specified for applications with minimal radial constraints. The relatively thick outer sleeve of a CN Series clamp minimizes stresses and allows them to handle high loads at elevated temperatures.

The CN Series clamp is composed of three components:

• Outer sleeve
• Inner sleeve
• Washer

As the outer sleeve turns (blue arrow), the inner sleeve moves upwards (red arrow). The washer spline rotationally couples the inner sleeve with the washer preventing the inner sleeve from turning while providing a solid reaction point for turning the outer sleeve.

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CN Series Clamp Features & Benefits

BENEFITS

• Reaction free bolt tensioning
• Pure tensile loads
• 100% elimination of galling on flange and stud surfaces
• Highest bolt tension accuracy and reliability available

FEATURES

• The CN Series ClampNut is used in conjunction with a coaxial action/reaction pneumatic or hydraulic torque tool.
• Through bolt design allows fit on any stud projection
• Robust outer sleeve minimizes stresses
• Castellated outer sleeve - eliminates need for oversize socket drive

  CN Series clamp application powered by J-Gun tool.

• Standard drives available for all applicable tools
• Low, Standard, Medium & High temperature ratings available
• All thread forms available

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CN Series Clamp Specifications

1. Identify Blank Size from table below. (Cross reference this number from the row with the proper Nominal Stud Size)
2. Verify that the Outside Diameter for this Blank Size will not interfere with adjacent nuts or other application constraints. (Such as a small counter bore)
3. Verify that the Max Load and Max Stroke are sufficient for the application.
4. Verify that there is sufficient overhead clearance for access with tooling.
5. Fill out the part number information on the adjacent page.

BLANK SIZE This is the basic body size for the CN Series clamp. Any desired thread up to the Nominal Stud Size can be cut into each Blank Size. SIZE CODE Size Code is the JETYD code used to indicate the Nominal Stud Size. The first digit signifies the whole number of inches. The second two digits signify the number of 1/16 of an inch. (108 = 1”+ 8/16 = 1½”) NOMINAL STUD SIZE This is the largest stud that will fit a particular Blank Size. All CN Series clamp blanks can be specified with threads smaller than the Nominal Stud Size. HEIGHT This is the overall height of the standard TN Series clamp for this Blank Size. Tooling will require additional overhead space. This is not the Height of the stud protrusion. Consult with a JETYD Applications Engineer when custom taller clamps are required. MAX STROKE CN Series clamps have maximum stroke lengths that are limited by the height of the splined washer. More stroke may be needed to accommodate gasket compression or an extraordinarily long joint length. Consult with a JETYD Applications Engineer for special extended stroke clamps. MAX LOAD This is the recommended maximum target load for each fastener on the application. This load is conservative as it allows margin for removal. It is based on 80% yield for ASTM A193 B7-B16 & 8TPI bolt material for the listed Nominal Stud Size. Consult with a JETYD Applications Engineer when higher loads are required.

BLANK SIZE	SIZE CODE	NOMINAL STUD SIZE		OUTSIDE DIAMETER (in)	HEIGHT (in)	MAX STROKE (in)	MAX LOAD (in)
		INCH	METRIC
01	14	7/8	M22	1.66	1.429	0.201	38,766
02	100	1	M24	1.811	1.559	0.220	50,857
03	102	1 1/8	M27	2.038	1.754	0.247	66,364
04	104	1 ¼	M30	2.264	1.949	0.275	83,933
05	106	1 3/8	M33	2.491	2.144	0.302	103,562
06	108	1 ½	M36	2.717	2.339	0.330	125,251
07	-	-	M39	2.943	2.533	0.357	130,951
08	110	1 5/8	M42	3.17	2.728	0.384	149,001
09	112	1 ¾	M45	3.396	2.923	0.412	174,812
10	114	1 7/8	M48	3.623	3.118	0.439	202,683
11	200	2	M52	3.925	3.378	0.476	232,615
12	204	2 ¼	M56	4.226	3.638	0.513	298,661
13	208	2 ½	M64	4.83	4.157	0.586	337,431
14	212	2 ¾	M70	5.283	4.547	0.641	412,102
15	-	-	M72	5.434	4.677	0.659	438,382
16	300	3	M76	5.736	4.937	0.696	494,230
17	-	-	M80	6.038	5.197	0.732	547,981
18	304	3 ¼	-	6.34	5.457	0.769	583,816
19	308	3 ½	M90	6.793	5.846	0.824	680,859
20	312	3 ¾	M95	7.17	6.171	0.870	785,360
21	700	4	M100	7.547	6.496	0.915	897,318
22	404	4 ¼	M110	8.302	7.146	1.007	802,685
23	408	4 ½	M115	8.679	7.47	1.053	902,848
24	412	4 ¾	M120	9.057	7.795	71098	1,008,889
25	500	5	M125	9.434	8.12	1.144	1,120,837
26	504	5 ¼	M130	9.811	8.445	1.190	1,238,662
27	508	5 ½	M140	10.566	9.094	1.281	1,362,375

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CN Series Clamp Facts & Information

Materials

CN Series material selection is based on the service temperature rating of the clamp. Please see the Clamp Service Temperature section of the JETYD catalog for a detailed specification on the materials used for each component of the clamp.

Application Tips

Measurement of the thread pitch is the most error prone portion of clamp specification. The easiest way to measure pitch is with a pitch gauge. Alternatively please provide JETYD with a sample of the stud.

Special coatings can cause dimensional variations on studs and nuts, i.e. Galvanized studs often have a coating build up that effectively changes the thread size. If the application studs have coatings, special care should be taken to determine the actual thread size. A standard UN nut will not fit a standard UN stud thread if a thick coating is applied. In these situations it will typically be best to supply JETYD with a sample stud.

Available Drives

Click here to see the Clamp Drive section.

Load Charts

All CN Series clamps are available with a Load Chart. Load Charts provide data points showing the tool’s hydraulic pressure vs. the bolt load that will be attained. A load chart can be created for any tool with any clamp.

Specials

When components fall outside of the boundaries of our standard parts’ numbering system, they become Specials. The following list exemplifies some of the variations that could make your clamp specification a Special:

• Modified or non standard thread sizes such as those for oversize studs
• Extended or shortened clamp length requirements
• Extended stroke requirements
• Special coating requirements such as galvanizing or Xylan
• Non-standard materials, testing or certification requirements

Specials will be assigned a special part number. Please contact a JETYD application engineer when specifying non-standard clamps.

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CN Series Clamp Applications

Common CN Series applications include:

• chemical processing facilities
• boiler feed pumps
• portal bolts

Click on an image for a larger view

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CN Series Clamp Demonstration Video

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