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The yellow cable ties indicate the date of the last tool inspection.]] [[Image:Manille sur quai.JPG|thumb|A well-used shackle.]] A '''shackle''' (or '''shacklebolt'''), also known as a '''gyve''', is a U-shaped piece of metal secured with a [[clevis pin]] or [[Bolt (fastener)|bolt]] across the opening, or a hinged metal loop secured with a quick-release locking pin mechanism. The term also applies to [[handcuffs]] and other similarly conceived restraint devices that function in a similar manner. Shackles are the primary connecting link in all manner of rigging systems, from boats and ships to industrial crane rigging, as they allow different rigging subsets to be connected or disconnected quickly. A shackle is also the similarly shaped piece of metal used with a locking mechanism in [[padlock]]s.<ref>{{Cite book |last=Robinson |first=Robert L. |url=https://books.google.com/books?id=ioy3vqVglTkC&pg=PA163 |title=Complete Course in Professional Locksmithing |date=1973 |publisher=Rowman & Littlefield |isbn=978-0-911012-15-6 |language=en}}</ref> A [[carabiner]] is a type of shackle used in [[mountaineering]]. == Types == {{anchor|shacklekey}}[[File:Rigging Knife (extended).jpg|thumb|The '''shackle key''' (extended) of a marine multi-tool is used to unscrew threaded shackles.]] ===Bow shackle === With a larger "O" shape to the loop, this shackle can take loads from many directions without developing as much side [[Structural load|load]]. However, the larger shape to the loop does reduce its overall strength. Also referred to as an anchor shackle. ===D-shackle=== Also known as a [[chain shackle]], D-shackles are narrow shackles shaped like a loop of chain, usually with a pin or threaded pin closure. D-shackles are very common and most other shackle types are a variation of the D-shackle. The small loop can take high loads primarily in line. Side and racking loads may twist or bend a D-shackle. ===Headboard shackle=== This longer version of a D-shackle is used to attach [[halyard]]s to [[sail]]s, especially sails fitted with a [[headboard (ship)|headboard]] such as on [[Bermuda rig]]ged boats. Headboard shackles are often stamped from flat strap stainless steel, and feature an additional pin between the top of the loop and the bottom so the headboard does not [[Friction burn|chafe]] the [[Eye splice|spliced eye]] of the halyard. ===Pin shackle=== A pin shackle is closed with an anchor bolt and cotter pin, in a manner similar to a [[clevis]]. It is for this reason they are often referred to, in industrial jargon, as ''clevises''. Pin shackles can be inconvenient to work with, at times, as the bolt will need to be secured to the shackle body to avoid its loss, usually with a [[split pin]] or seizing wire. A more secure version used in crane rigging features the combination of a securing [[nut (hardware)]] located alongside the cotter pin. Pin shackles are practical in many rigging applications where the anchor bolt is expected to experience some rotation. ===Snap shackle=== [[Image:Splice on snap shackle.jpg|thumb|A snap shackle [[rope splicing|spliced]] to a line.]] As the name implies, a snap shackle is a fast action fastener which can be implemented single-handedly. It uses a spring-activated locking mechanism to close a hinged shackle, and can be unfastened under load. This is a potential safety hazard, but can also be extremely useful at times. The snap shackle is not as secure as any other form of shackle, but can come in handy for temporary uses or in situations which must be moved or replaced often, such as a sailor's [[safety harness|harness]] tether or to attach [[spinnaker]] [[sheet (sailing)|sheets]]. Note: When this type of shackle is used to release a significant load, it will work rather poorly (hard to release) and is likely to have the pin assembly or the split ring fail. ===Threaded shackle=== [[File:Moused shackle.gif|thumb|left|100px|A moused shackle]] [[File:Front of a MAN fire engine with winch and shackles.jpg|thumb|Front of a [[MAN SE|MAN]]-based [[fire engine]] with two mounted threaded shackles and a [[winch]]]] The pin is [[Threading (manufacturing)|threaded]] and one leg of the shackle is [[Tap and die|tapped]]. The pin may be ''captive'', which means it is mated to the shackle, usually with a wire. The threads may [[galling|gall]] if overtightened or have been corroding in salty air, so a liberal coating of [[lanolin]] or a heavy grease is not out of place on any and all threads. A shackle key or metal [[marlinspike]] are useful tools for loosening a tight [[nut (hardware)|nut]]. For safety, it is common to [[mouse (shackle)|mouse]] a threaded shackle to keep the pin from coming loose. This is done by looping ''mousing wire'' or a nylon [[zip tie]] through the hole in the pin and around the shackle body. For pins that have a cross-hole in the threaded end a cotter pin can be used. One disadvantage of wire is that mousing can introduce [[galvanic corrosion]] because of material differences; it is especially bad when used in places where the shackle is exposed to air and water. Nylon is not recommended for use where significant movement of the shackle is expected.<ref>{{cite book|url=https://books.google.com/books?id=jUdZlpHWShkC&q=mousing+shackle+nylon&pg=SA3-PA80|title=Admiralty Manual of Seamanship|pages=3–80|date=1995|publisher=The Stationery Office |isbn=9780117726963}}</ref> ===Twist shackle=== A twist shackle is usually somewhat longer than the average, and features a 90° twist so the top of the loop is perpendicular to the pin. One of the uses for this shackle include attaching the [[jib]] halyard [[Block (sailing)|block]] to the [[Mast (sailing)|mast]], or the jib halyard to the sail, to reduce twist on the [[Parts of a sail#Edges|luff]] and allow the sail to set better. ===Soft shackle=== Modern strong fibers such as [[zylon|PBO]] ([[IUPAC]] name: poly(p-phenylene-2,6-benzobisoxazole), [[aramid]]s ([[Kevlar]], [[Technora]], [[Twaron]]), [[Vectran]], [[carbon fibers]], [[Ultra-high-molecular-weight polyethylene#Fiber|ultra-high-molecular-weight polyethylene]] (UHMWPE, Dyneema, Spectra) and other [[synthetic fiber]]s are used to make extra strong ropes which can also be tied into lockable loops called '''soft shackles'''.<ref>{{Cite AV media |url=https://www.youtube.com/watch?v=jH66tGsWv_Y |title=Softie Soft Shackle Construction- How to. |date=2010-06-17 |last=John Franta |access-date=2024-10-17 |via=YouTube}}</ref> According to sailmagazine.com, "a soft shackle can handle just about every function performed by a metal shackle, in many cases better. Soft shackles articulate better, don’t rattle around when not under load, don’t chew up toe rails or beat up masts and decks, don’t hurt when they whack you on the head, are easier to undo and don’t have pins that fall overboard at a critical moment".<ref>{{Cite web |title=Ma Ní Shackle hay còn gọi là Mã Ní hay Móng Ngựa chính hãng |url=https://capthepmienbac.com.vn/ma-ni/ |access-date=2024-10-17 |language=vi}}</ref> A modern rope can lift as heavy loads as a steel wire 3 times as thick and much heavier. Metal shackles may be preferred because soft shackles can be cut by sharp edges, burned, or deteriorate in some environments. One disadvantage of soft shackles made of Dyneema and other modern fibers is their susceptibility to be weakened by heat, also heat caused by friction. It is advisable to subject it to medium level loads for a while to remove any slack that may cause friction heat when loaded to its maximum. The [[Button knot|stopping knot of a soft shackle]] may be a [[true lover's knot]], a [[diamond knot]], a double line [[celtic button knot]] or a [[chinese button knot]] (ABOK #600, ABOK #601, ABOK #603 doubled as one tail-end reverse-trails the other, emerging tail-ends preferably buried in the opposing main part as it emerges together from the knot for [[Chinese finger trap]] attachment). Another preferred stopping knot is a two rope combined wall+crown+wall+crown [[Wall and crown knot|knot]] (a [[Rose knot|two string rose knot]]).<ref name="HowNOT2_2019">{{Cite AV media |url=https://www.youtube.com/watch?v=91_jEjQdlBU |title=Tying a button knot soft shackle WITH break tests - for slacklining and highlining |date=2019-03-06 |last=HowNOT2 |access-date=2024-10-17 |via=YouTube}}</ref> The latter ones with the added thickness of the returning tail ends have the advantage of less of a sharp curvature at their weakest spot, the eye around the neck of the button.<ref name="HowNOT2_2019"/> <gallery> File:Manille_textile_dyneema_01.jpg| Fully buried Dyneema soft shackle open, eye with ring closed File:Manille_textile_dyneema_02.jpg| Dyneema soft shackle open, eye opened using the ring File:Manille_textile_dyneema_03.jpg| Dyneema soft shackle with [diamond knot] head locked File:Erse_a_bouton_01.jpg|Soft shackle with [diamond knot] head, and [Turks head] collar open File:Erse_a_bouton_02.jpg|Soft shackle with [diamond knot] head, and [Turks head] collar locked File:Soft shackles.JPG|Two with [diamond knot] head, and buried eye with openining string, one with ends-buried-button-knot and eye adjustable by crossing sides. </gallery> == References == <references /> ==Further reading== {{Wiktionary}} {{commons category|Shackles}} * Edwards, Fred (1988). ''Sailing as a Second Language.'' Camden, ME: International Marine Publishing. {{ISBN|0-87742-965-0}}. * Hiscock, Eric C. (1965). ''Cruising Under Sail.'' Oxford University Press. {{ISBN|0-19-217599-8}}. * Marino, Emiliano (1994). ''The Sailmaker's Apprentice: A guide for the self-reliant sailor.'' 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