This page covers 19 IKO CRH Series heavy duty inch cam followers (CRH8-1VBUU to CRH56VBUU, 1/2 to 3 1/2 in OD): a hexagon hole in the stud head, full complement needle rollers, sealed type construction and a cylindrical outer ring. Choose the size in the options above; each variant has its own dimensions and ratings in the Model Details. The CRH series is the inch series heavy duty cam follower, a full complement type with a black oxide film treatment. A cam follower is a bearing with a stud, with needle rollers inside a thick-walled outer ring. The outer ring rotates and runs directly on the mating track (cam guide surface), so cam followers suit cam mechanisms and linear motions and are used in machine tools, industrial robots, electronic devices and office automation (OA) equipment. In the part number, the number is the outer ring diameter in 1/16 inch; B is the hexagon hole in the stud head, V is the full complement type (no V is with cage), UU is the sealed type (no UU is the shield type), and R is the crowned outer ring (no R is cylindrical). Every model on this page is sealed type, full complement, cylindrical outer ring. Where this product is used Cam mechanisms, with the outer ring running directly on the cam track Linear motion and follower applications Machine tools and industrial robots Electronic devices and office automation (OA) equipment Features Inch series heavy duty stud type with a hexagon hole in the stud head and a black oxide film treatment Full complement needle rollers: suited to heavy loads at low speed rotations Sealed type: seals fitted in the narrow clearances keep foreign substances out Cylindrical outer ring: a large contact area on the mating guide surface, suited to large loads or a low hardness guide surface Prepacked with grease Supplied with a nut and, on the larger studs, a grease nipple (see the Model Details for each size) Basic dynamic load rating C 4,710 to 111,000 N and static load rating C0 5,410 to 239,000 N (each size in the Model Details) Track capacity 2,360 to 87,000 N on a 40 HRC mating surface Key specifications Specification Detail Type Inch series heavy duty cam follower (stud type) Models CRH8-1VBUU to CRH56VBUU (19 sizes) Stud diameter d1 6.35 to 44.45 mm (1/4 to 1 3/4 in) Thread G 1/4-28 to 1 3/4-12UN Outer ring diameter D 12.7 to 88.9 mm (1/2 to 3 1/2 in) Outer ring width C 9.525 to 50.8 mm (3/8 to 2 in) Rolling elements Full complement needle rollers Seal Sealed type (UU in the part number) Outer ring Cylindrical outer ring Stud head Hexagon hole in the stud head (B in the part number) Basic dynamic load rating C 4,710 to 111,000 N Basic static load rating C0 5,410 to 239,000 N Track capacity (mating surface 40 HRC) 2,360 to 87,000 N Lubrication Prepacked with grease Recommended mounting hole tolerance for the stud F7 Brand IKO (Nippon Thompson Co., Ltd., Japan) Available sizes Show all 19 sizes with dimensions, load ratings and mass Model Stud d1 mm (in) Thread G OD D mm (in) Width C mm (in) C (N) C0 (N) Mass (g) CRH8-1VBUU 6.35 (1/4) 1/4-28 12.7 (1/2) 9.525 (3/8) 4,710 5,410 12 CRH10-1VBUU 7.938 (5/16) 5/16-24 15.875 (5/8) 11.112 (7/16) 6,340 8,530 23 CRH11VBUU 7.938 (5/16) 5/16-24 17.462 (11/16) 11.112 (7/16) 6,340 8,530 27 CRH12VBUU 11.112 (7/16) 7/16-20 19.05 (3/4) 12.7 (1/2) 8,710 12,300 39 CRH14VBUU 11.112 (7/16) 7/16-20 22.225 (7/8) 12.7 (1/2) 8,710 12,300 49 CRH16VBUU 15.875 (5/8) 5/8-18 25.4 (1) 15.875 (5/8) 13,100 22,700 93 CRH18VBUU 15.875 (5/8) 5/8-18 28.575 (1 1/8) 15.875 (5/8) 13,100 22,700 109 CRH20VBUU 19.05 (3/4) 3/4-16 31.75 (1 1/4) 19.05 (3/4) 23,600 31,700 176 CRH22VBUU 19.05 (3/4) 3/4-16 34.925 (1 3/8) 19.05 (3/4) 23,600 31,700 200 CRH24VBUU 22.225 (7/8) 7/8-14 38.1 (1 1/2) 22.225 (7/8) 28,200 40,100 296 CRH28VBUU 25.4 (1) 1-14 UNS 44.45 (1 3/4) 25.4 (1) 35,300 55,600 463 CRH30VBUU 25.4 (1) 1-14 UNS 47.625 (1 7/8) 25.4 (1) 35,300 55,600 508 CRH32VBUU 28.575 (1 1/8) 1 1/8-12 50.8 (2) 31.75 (1 1/4) 45,700 80,600 722 CRH36VBUU 28.575 (1 1/8) 1 1/8-12 57.15 (2 1/4) 31.75 (1 1/4) 45,700 80,600 858 CRH40VBUU 31.75 (1 1/4) 1 1/4-12 63.5 (2 1/2) 38.1 (1 1/2) 61,400 116,000 1,260 CRH44VBUU 31.75 (1 1/4) 1 1/4-12 69.85 (2 3/4) 38.1 (1 1/2) 61,400 116,000 1,460 CRH48VBUU 38.1 (1 1/2) 1 1/2-12 76.2 (3) 44.45 (1 3/4) 77,600 172,000 2,100 CRH52VBUU 38.1 (1 1/2) 1 1/2-12 82.55 (3 1/4) 44.45 (1 3/4) 77,600 172,000 2,380 CRH56VBUU 44.45 (1 3/4) 1 3/4-12UN 88.9 (3 1/2) 50.8 (2) 111,000 239,000 3,240 Sizes are in mm with the inch size in brackets. C is the basic dynamic load rating and C0 the basic static load rating. Mass is for the product body only: the nut, grease nipple and other accessories are not included. Selecting the right option The options on this page are the stud diameter (inch) and the roller width (the outer ring width C). Where two models would otherwise show the same stud diameter and roller width, the model number is added in brackets to the roller width of the second one. Models with the same stud diameter and roller width but a different outer ring diameter D: 15.875 mm (5/8 in) OD and 17.462 mm (11/16 in) OD (CRH10-1VBUU and CRH11VBUU); 19.05 mm (3/4 in) OD and 22.225 mm (7/8 in) OD (CRH12VBUU and CRH14VBUU); 25.4 mm (1 in) OD and 28.575 mm (1 1/8 in) OD (CRH16VBUU and CRH18VBUU); 31.75 mm (1 1/4 in) OD and 34.925 mm (1 3/8 in) OD (CRH20VBUU and CRH22VBUU); and others in the size table. Check the Model Details for D before you order. Match the stud diameter and thread to your mounting hole and nut: the Model Details list the thread, the thread length and the hexagon hole size. This page is the cylindrical outer ring type. A cylindrical ring has a large contact area with the mating guide surface and suits applications where the applied load is large or the guide surface hardness is low. Every model here is the full complement type, which is suited to heavy loads at low speed rotations. The Model Details give each dimension in mm with the inch size in brackets. A maximum allowable static load is not published for the inch cam follower series: ask AIMS if you need that figure. Fitting and use Make the centre axis of the mounting hole perpendicular to the direction of travel and match the stud shoulder accurately with the seating surface given by dimension f (min.) in the Model Details. Keep the chamfer on the mounting hole as small as possible (C0.5 or so), and do not hit the flange head directly with a hammer, because that can lead to irregular rotation or cracking. Hold the hexagon hole with a hex key and tighten the nut with a spanner: turning the hexagon hole itself to tighten can damage it. Do not exceed the maximum tightening torque in the Model Details, because an over-tightened thread can break. Where loosening is possible, use a lock nut, spring washer or self-locking nut. The mark on the flange head shows the oil hole position on the raceway: keep the oil hole out of the loading zone. The recommended mounting hole tolerance for the stud is F7. Lubrication: the models on this page are prepacked with grease. Track capacity is the load that can be applied continuously on a steel cam guide surface of 40 HRC without deforming or indenting it. For a different hardness it is multiplied by the track capacity factor (0.58 at 30 HRC): ask AIMS if you need the factor for your guide surface. If you are unsure which size suits your cam track and mounting, send AIMS the part number or the dimensions and we will help you confirm it. Related products Other IKO CRH series pages (other outer ring, rolling element, seal or material types): CRH series heavy duty inch cam followers, full complement, sealed, crowned, 5/8 to 3 1/2 in OD. Related stud types: CR series inch cam followers, full complement, sealed, cylindrical, 1/2 to 2 in OD.
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