{"product_id":"shs-piston-head-bearing-double-o-ring","title":"SHS Piston Head — Ball Bearing and Double O-Ring","description":"\u003cdiv style=\"background:#edfaf1;border-left:4px solid #27ae60;padding:12px 16px;border-radius:0 6px 6px 0;margin:0 0 16px;font-size:13px;\"\u003e\n\u003cstrong style=\"color:#1a6b3a;\"\u003eSHS Piston Head with Ball Bearing and Double O-Ring — a bearing so the spring can turn, and two o-rings so the air cannot escape.\u003c\/strong\u003e Compression parts work as a set, never alone.\n\u003c\/div\u003e\n\u003cp\u003eA spring under compression wants to twist. A bearing between the spring and the piston head lets it do that instead of winding the piston up with it.\u003c\/p\u003e\n\u003cp\u003eThe double o-ring is the other half. Two seals against the cylinder wall hold compression better than one, which is what makes a rebuilt gearbox consistent rather than merely loud.\u003c\/p\u003e\n\u003cp\u003eVent holes through the body let air out behind the head on the return stroke, so it is not fighting itself on the way back.\u003c\/p\u003e\n\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eSpecifications\u003c\/h2\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:13px;margin:0 0 18px;\"\u003e\n\u003ctr style=\"background:#1B3A6B;color:#fff;\"\u003e\n\u003cth style=\"padding:7px 12px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding:7px 12px;text-align:left;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003ePiston head\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eCNC machined aluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eBearing\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eIntegrated ball bearing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eSeal\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eDouble o-ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eVenting\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003ePorted body\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eFits\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eStandard AEG gearboxes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eSold as\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eSingle piston head\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eGood to know before you buy\u003c\/h2\u003e\n\u003cp\u003eAluminium adds a little weight over a polymer head. On a very high rate of fire build that is a trade to think about.\u003c\/p\u003e\n\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the bearing actually do?\u003c\/strong\u003e \u003cbr\u003eIt lets the spring rotate freely as it compresses, instead of transmitting that twist into the piston and the gearbox shell.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy two o-rings rather than one?\u003c\/strong\u003e \u003cbr\u003eTwo sealing surfaces hold compression more reliably as the cylinder wears. It is the same reasoning as a double-sealed cylinder head.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need a particular piston for it?\u003c\/strong\u003e \u003cbr\u003eIt uses the standard piston head thread found on most AEG pistons, but check yours before ordering if the build is unusual.\u003c\/p\u003e\n\u003cdiv style=\"background:#fffbe6;border-left:4px solid #f0d060;padding:12px 16px;border-radius:0 6px 6px 0;margin:0 0 16px;font-size:13px;\"\u003e\n⚠ \u003cstrong\u003eCheck the piston head clears the cylinder head:\u003c\/strong\u003e a taller head on a short-stroked or bore-up build can bottom out and destroy both parts.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1B3A6B;color:#fff;padding:12px 16px;border-radius:6px;margin:18px 0 0;font-size:13px;\"\u003e\n\u003cstrong style=\"color:#fff;\"\u003e💡 Titan Forge Airsoft tip:\u003c\/strong\u003e Do not overtighten it. The thread is small and the head only needs to be firm against the piston face. Browse \u003ca href=\"\/collections\/gearbox-parts\" style=\"color:#cdd6f4;\"\u003egearbox parts\u003c\/a\u003e.\n\u003c\/div\u003e","brand":"SHS","offers":[{"title":"Default Title","offer_id":53619762430328,"sku":"36953004","price":8.95,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0562\/8097\/3450\/files\/image-Photoroom_10.jpg?v=1764255187","url":"https:\/\/www.titanforgeairsoft.com\/products\/shs-piston-head-bearing-double-o-ring","provider":"Titan Forge Airsoft","version":"1.0","type":"link"}