{"product_id":"sw-j-frame-model-642-2-airweight-mainspring-stirrup-swivel-38-special-p-642k","title":"S\u0026W J Frame Model 642-2 Airweight Mainspring Stirrup \u0026 Swivel .38 Special +P – Part# 642K","description":"\u003ch2\u003eSmith \u0026amp; Wesson J Frame Model 642-2 Airweight Mainspring Stirrup \u0026amp; Swivel – Stainless Steel\u003c\/h2\u003e\n\n\u003cp\u003eRestore reliable hammer fall and trigger pull on your Model 642-2 Airweight with this factory-original mainspring stirrup and swivel set. The mainspring stirrup is the U-shaped yoke that connects the mainspring to the hammer, transferring spring energy into hammer movement — the swivel allows the stirrup to pivot smoothly as the hammer travels through its arc. A worn, cracked, or broken stirrup or swivel causes inconsistent hammer fall, light strikes, or complete failure to fire. This stainless steel matched set is the correct factory replacement for the J Frame Model 642-2 chambered in .38 S\u0026amp;W Special +P.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 642K\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Smith \u0026amp; Wesson J Frame Model 642-2 Airweight\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e .38 S\u0026amp;W Special +P\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Mainspring Stirrup \u0026amp; Swivel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Used (factory original)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Gunsmith fitting recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFactory Replacement Quality\u003c\/h3\u003e\n\u003cp\u003eGenuine Smith \u0026amp; Wesson factory parts manufactured to the exact specifications and tolerances of the originals — same dimensions, same pivot geometry, same reliable hammer energy transfer. No aftermarket substitutes.\u003c\/p\u003e\n\n\u003ch3\u003eFinding Your Model Number\u003c\/h3\u003e\n\u003cp\u003eSwing out the cylinder and check behind the yoke on the frame. Model numbers have been stamped there since 1957–58. If your revolver has no model number, it predates that era — contact us with the serial number and we'll help identify the correct part.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuestions?\u003c\/strong\u003e Call or email us — we're happy to help you get the right part the first time.\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":40852573487162,"sku":null,"price":14.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/files\/s-l960_40_98c972dd-c83f-49a7-9b4e-816b525f4741.webp?v=1745258373","url":"https:\/\/usagunsandgear.com\/products\/sw-j-frame-model-642-2-airweight-mainspring-stirrup-swivel-38-special-p-642k","provider":"USA Guns And Gear","version":"1.0","type":"link"}