Crosby products are well known for their quality, design, and selection — and their hooks are no exception. But do you know how to interpret and utilize the forged-in letters and markings?
Our Product Specialists are always there to help you identify the hooks but here are a few tips to help you learn more:
- Crosby hooks have two letters located near the shank. The first letter is the hook ID code (size). As the letters increase in the alphabet, the size of the hook increases. For example, for hook ID codes of the same material, F is smaller than hook ID code G, G is smaller than H, and so on. Crosby eye hooks as pictured are available in sizes D thru T. The second letter designates the hook material: C for Carbon and A for Alloy. Alloy hooks have a greater working load limit for hooks of the same physical size. These letters will assist in determining the proper latch kit for the hook.
- Speaking of WLL, this is also forged into the body of the hook. Crosby hooks have working load limits designated in metric tons (t = 2,204 lbs.). For example, the gold colored hook pictured has a WLL of 1t as marked on the hook. All lifting hooks must be load rated (with either the working load or a cross reference code).
- In addition to a traceability code, the manufacturer’s name or logo should always be stamped or forged into the hook. In this case, Crosby text is forged into the hook but many manufacturers choose to mark their hooks with their logo or insignia only.
- All Crosby hooks (and shackles) have patented Quic-Check marks forged into the hook at 45° angles from vertical. These are utilized to quickly check the approximate angle of a two-legged hitch. Remember, at the base of a hook, 90° is the maximum included angle between the sling legs, so be certain the eyes of the sling are not exceeding the angle indicator marks. If the slings are beyond those marks, the sling angle is above 90° and the rigging must be changed.
- The other set of marks are deformation indicators. One mark is just below the shank or eye and the other is on the hook tip. This allows for a Quic-check measurement to determine if the throat opening has changed, thus indicating abuse or overload. To check, measure the distance between the marks. The marks should align to either an inch or half-inch increments. If the measurement does not meet these criteria, the hook should be inspected further for possible damage.
Whether it be a Crosby hook or another manufacturer’s, knowing how to identify the markings helps insure proper rigging for the life of the hook. As always, don’t hesitate to contact us with questions on selecting and identifying the proper hook and latch for the job.
