437-007-0635 Shackles (1) Shackle pin diameter must be: (a) 1/8- inch larger than the indicated shackle size for shackles up to 1 3/4 inches. (b) 1/4- inch larger than the indicated shackle size for shackles 1 3/4-inch up through 3 inches. (2) Replacement shackle pins must meet the manufacturer’s original specifications for strength and design for the size of shackle being used. (3) Shackle pins and nuts must be replaced when the threads are worn or stripped. (4) Worn shackle pins must be replaced when the original diameter is reduced by 15 percent. (5) The opening size between the jaws of shackles used to hang blocks, jacks, rigging, and join or attach lines, cannot be more than 1-inch greater than the size of the line, swivel, shackle, or similar device to which it is attached. (6) Safety pins must secure shackles used to hang blocks, jacks, or rigging on trees, anchor guylines and join guyline or deadman strap eyes. Figure 7-7 — Shackle — Safety Pin [Figure not included. See ED. NOTE.] (7) When skylines are attached with a shackle using a knockout pin, the pin must be one size larger than the skyline and secured with a molly, latchpin, or cotterkey. (See Figures 7-8 and 7-9.) (8) Sleeve shackles or choker bells must be used where choked lines are permitted. Figure 7-8 — Shackle — Sleeve with Knockout Pin Figure 7-9 — Shackle — Bell with Knockout Pin Figure 7-10 — Skyline Attachments with Knockout Pins Figure 7-11 — Shackle — Sleeve with Safety Pin [Figures not included. See ED. NOTE.] (9) When a line is passed around an anchor without the use of a strap, the shackle pin must be inserted through the line eye and the "U" part of the shackle placed around the bight of the line. (10) Sleeve shackles must not be used to join two or more eyes together. (11) A flush pin, straight-sided shackle must be used to connect the eyes of lines if: (a) The shackle will be crossed by a sheave; or (b) A sheave will be crossed by the shackle. Figure 7-12 — Shackle — Flush Pin, Straight Side [Figure not included. See ED. NOTE.] (12) When shackles are crossed by carriages, the pin must be facing the landing. (13) Shackles used to join three or more lines must be hung with the: (a) Pin through the single eye. (b) "U" part through two or more line eyes. (14) When attaching a guyline, mainline, or skyline eye to two or more strap eyes, the: (a) Shackle pin must be placed through the guyline, mainline, or skyline eye. (b) "U" part of the shackle must be placed through the strap eyes. (15) After a strap is passed around an anchor and the two eyes are contained in the "U" part of the shackle, the angle created by the strap eyes must not be greater than 90 degrees. Figure 7-13 — Shackle — Straps within 90 Degrees [Figure not included. See ED. NOTE.] NOTE: If the angle created by the strap eyes is greater than 90 degrees, the strap is too short. The shackle containing the strap eyes should be hung at least half the diameter of the anchor away from the anchor. (16) Shackles used to connect tipping plate anchor lines to the eye of a guyline, mainline, or skyline must be: (a) 1/8-inch larger than the largest line. (b) Rated for a load equal to or greater than the expected working load. (c) Large enough to accommodate all line eyes. (17) Shackles attached to tipping plate anchors must have the shackle pins inserted through the anchor pad-eyes. (18) A shackle must have a rated breaking strength greater than the rated breaking strength of the line that they are used with. (19) The manufacturer’s rated breaking strength of shackles must be used in determining oversize requirements when the make, size and steel classification of the shackle can be identified. (20) Shackles listed in Tables 7-4, 7-5 and 7-6 must be made of alloy steel which develops 120,000 PSI ultimate tensile strength or better. NOTE: Shackles sizes are listed for extra improved plow steel wire rope. (21) The minimum size of shackles required to hang or attach single sheave blocks or jacks are shown in Table 7-4. Table 7- 4 — Bell Shaped and Sleeve Shackles Used to Hang or Attach Single Sheave Blocks or Jacks [Table not included. See ED. NOTE.] (22) The minimum size of shackles required for joining or attaching lines are shown in Table 7-5. Table 7-5 — Bell Shaped and Sleeve Shackles Used to Join or Attach Lines [Table not included. See ED. NOTE.] (23) The minimum size of flush pin straight-sided shackles for joining or attaching skyline extensions are shown in Table 7-6. Table 7-6 — Flush Pin Straight-Sided Shackles Used for Attaching Skyline Extensions [Table not included. See ED. NOTE.] [ED. NOTE: Figures and Tables referenced are available from the agency.] Statutory/Other Authority: ORS 654.025(2) & 656.726(4) Statutes/Other Implemented: ORS 654.001 - 654.295 History: OSHA 5-2003, f. 6-2-03, cert. ef. 12-1-03