Sure-Grip®* “Quick Detachable” bushings are split through flange and taper to provide a true clamp on the shaft that is the equivalent of a shrink fit.
(*Trademark of TB Wood’s Incorporated.)
Benefits & features
- Sure-Grip® securely clamps the shaft, with twice the force of those competitive bushings, to provide extreme holding power.
- Sure-Grip® bushings permit the mounting of the same mating part on shafts of different diameters and the mounting of different sheaves on the same shaft using the same bushing.
- Their interchange ability extends through sheaves, pulleys, timing pulleys, sprockets, flexible and rigid couplings, made-to-order items by Continental and product lines of several other power transmission manufacturers.
Technical specifications
- Sure-Grip® bushings are manufactured with the drilled and tapped holes located at a precise distance from the keyseat; thus, a wide mating part having a bushing in each end can be mounted on a common shaft with the two keyways in line. This feature not only facilitates installation but also permits both bushings to carry an equal share of the load.
- All bushing sizes, except JA and QT, have a setscrew over the key to help maintain the bushing’s position on the shaft until the cap screws are securely tightened.
- Sure-Grip® bushings have a very gradual taper (3/4-inch taper per foot on the diameter), which is about half the inclined angle of many other bushings.
- The standard material is class 30 or higher cast iron. Products made from cast iron have a maximum speed limitation of 6,500 feet per minute at the outside diameter. Higher speed requirements dictate the use of higher strength materials. For speeds up to 16,000 feet per minute or high shock application requiring greater toughness, special ductile iron products can be made.
- The standard balance is a one-plane tolerance to a G26 quality grade based on 3,500 rpm or the maximum rated speed. A two-plane balance to a G6.3 quality grade is available at an added cost. Sure-Grip® bushed products, which are one-plane balanced, are marked so the bushing can be reinstalled at the application the same way it was installed for balancing. See MPTA SPB-95 for standard balancing practices.
Available sizes
| Sure - Grip® Bushings |
| QT** |
SF |
N |
| JA |
E |
P |
| SH |
F |
W |
| SDS |
J |
S |
| SK |
M |
|
H = Split Taper Bushing
QT = QD ® Bushing; interchangeable with an H bushing
| Sure - Grip® Bushings (Millimeter Bores-Inches Bolt) |
| QT** |
SF |
P |
| JA |
E |
SKL |
| SH |
F |
SFL |
| SDS |
J |
EL |
| SD |
M |
|
| SK |
N |
|
| Metric Sure - Grip® Bushings |
| QTMX |
SDSMX |
SFMX |
| JAMX |
SDMX |
EMX |
| SHMX |
SKMX |
FMX |
| Sure - Grip® Idler Bushings & Replacement Bearings |
| SH-BB |
SK-BB |
E-BB |
| SD-BB |
SF-BB |
|
| Sure - Grip® Short Bushings |
| JS |
NS |
WS |
| MS |
PS |
|
Sure-Grip® bushings conform to the specifications set forth by the Mechanical Power Transmission Association (MPTA) in their CO -1 Guideline of October 1992
An “MPB” or “Minimum Plain Bore” bushing is available in most bushing sizes. These bushing are unsplit and have no keyway. These bushings are intended for reboring and other alterations
Sure-Grip® bushings for inch shafts conform to ANSI B17.1-1967, R1989 for key size versus shaft diameter and keyway dimensions. Square keys are used where possible. For larger bores where a square key is not possible, the required rectangular key is furnished with the bushing
Sure-Grip® bushings for metric shafts conform to British Standard HS 4235: Part 1:1972 for key size versus shaft diameter and keyway dimensions. For larger bores where it is not possible to maintain the standard keyway depth, a more shallow keyway may be used. Special metric keys are not furnished with the bushing.
Standards
The following products meet or exceed the noted ARPM design standards:
| Classical V-Belt Sheaves |
IP-20-2007 |
| Narrow V-Belt Sheaves |
IP-22-2007 |
| Synchronous Belt Pulleys |
IP-24-2010 |
| Curvilinear Belt Sprockets |
IP-27-2009 |
| FHP Belts and Sheaves |
IP-23-2009 |
| Hex Belts and Sheaves |
IP-21-2009 |
| Variable Speed |
IP-25-2010 |
| V-Ribbed Belts |
IP-26-2009 |
Special constructions available
We have the capability to assist in your design and quote any specially designed power transmission drive. We are able to offer consistently competitive prices and fast delivery on the following specials, plus much more.
V-belt sheaves
- Nonstandard diameter requirements
- Nonstandard number of grooves
- Unusual hub configurations
- Deep grooves
- Metric grooves
- Added inertia or flywheel effect
Synchronous sprockets
- Nonstandard number of teeth
- Nonstandard face widths
- Unusual hub configurations
- Special tooth profiles
- Added inertia of flywheel effect
Flat belt pulleys
- Nonstandard diameter requirements
- Nonstandard face widths
- Unusual hub configurations
- Split through rim or arm designs
- All types of special crowns
- Added inertia or flywheel effect
- Taper cone arrangements
Flywheels
- Flywheels per customer design