Self Locking Hook
Table 1
| Minimum Cross-Section | |||
|---|---|---|---|
| Nominal Chain Size | Dimensional Limit | ||
| mm | in. | mm | in. |
| 8 | 5/16 | 6.9 | .272 |
| 10 | 3/8 | 8.7 | .342 |
| 13 | 1/2 | 11.3 | .443 |
| 16 | 5/8 | 13.9 | .546 |
Refer to ASME B30.9 for criteria for removal from service.
Hook latch must be seated properly and fully operational.
If an X100® self locking hook latch tip opening is greater than the numbers shown below in Table 2 and 3, then the hook must be removed from service and must not be returned to service until it is repaired.
Notched latch on sizes up to 5/8″.
Table 2
Self Locking Hooks with Flat Tip
| Size | Maximum Opening | ||||
|---|---|---|---|---|---|
| Material Lift Handling | Personnel Lift Handling | ||||
| mm | in. | mm | in. | mm | in. |
| 5/6 | 7/32 | 2.2 | .09 | 1.5 | .06 |
| 7/8 | 9/32 | 2.7 | .11 | 1.9 | .07 |
| 7 | 9/32 | 2.7 | .11 | 1.9 | .07 |
| 8 | 5/16 | 2.7 | .11 | 1.9 | .07 |
| 10 | 3/8 | 3.2 | .13 | 2.2 | .09 |
| 13 | 1/2 | 3.7 | .15 | 2.6 | .10 |
| 16 | 5/8 | 4.7 | .19 | 3.2 | .13 |
Table 3
Self Locking Hooks with Notched Tip
| Size | Maximum Opening | ||||
|---|---|---|---|---|---|
| Material Handling | Personnel Handling | ||||
| mm | in. | mm | in. | mm | in. |
| 5/6 | 7/32 | 3.2 | .13 | 2.2 | .09 |
| 7/8 | 9/32 | 3.7 | .15 | 2.7 | .11 |
| 7 | 9/32 | 3.7 | .15 | 2.7 | .11 |
| 8 | 5/16 | 3.7 | .15 | 2.7 | .11 |
| 10 | 3/8 | 4.2 | .17 | 3.2 | .13 |
| 13 | 1/2 | 4.7 | .19 | 3.7 | .15 |
| 16 | 5/8 | 5.7 | .23 | 4.7 | .19 |
Table 4 – Effect of Elevated Temperature on the Working Load Limit Of Alloy Chain
| Temperature | Percentage of WLL Adjustment | ||||
|---|---|---|---|---|---|
| Reduction of Working Load Limit WHILE AT Temperature | Permanent Reduction of Working Load Limit AFTER EXPOSURE to Temperature | ||||
| Below 400ºF | NONE | NONE | |||
| 400ºF | 15% | NONE | |||
| 500ºF | 25% | 5% | |||
| 600ºF | 30% | 15% | |||
| 700ºF | 40% | 20% | |||
| 800ºF | 50% | 25% | |||
| 900ºF | 60% | 30% | |||
| 1,000ºF | 70% | 35% | |||
| Over 1,000ºF | OSHA 1910.184 requires all slings exposed to temperatures over 1,000ºF to be removed from service | ||||
IMPORTANT DO NOT use a chain sling in extreme temperatures!Alloy steel chain slings must not be used if they are cooled less than -40ºF or heated greater than 1,000ºF. WLLs in the tables are rated for temperatures above -40ºF and below 400ºF. WLL ratings must be adjusted with Table 4 if temperatures exceed 400ºF. Certified tags must be replaced with a new tag that displays the reduced WLL. Per- OSHA 1910.184(e)(6). “…alloy steel chain shall be permanently removed from service if they are heated above 1,000ºF…”
Welded Chain Specifications
NACMX100® Grade 100 alloy steel chain and components are not be used in alkaline conditions or acidic conditions. Alkaline and acidic conditions will cause metal embrittlement which will accelerate corrosion, causing sudden sling failure. Electro-zinc plating and hot-dip galvanizing of alloy steel chain must only be performed by Advantage.