{"product_id":"mold-stop-posts-ejector-plate-limit-posts-s45c-pack-of-4","title":"Mold Stop Posts (Ejector Plate Limit Posts), S45C — Pack of 4","description":"\u003cp\u003eMold stop posts (limit posts) in S45C, sold in \u003cstrong\u003epacks of 4\u003c\/strong\u003e — the quantity a standard ejector plate uses. Sizes are given as \u003cstrong\u003eoutside diameter × height\u003c\/strong\u003e, with the mounting thread in brackets. All dimensions in millimetres.\u003c\/p\u003e\n\n\u003ch2\u003eWhat they do\u003c\/h2\u003e\n\u003cp\u003eStop posts sit between the ejector plate and the clamping plate. They set where the ejector plate rests when it is fully back, and they take the impact each time it returns. They are counterbored for a socket head cap screw, so they bolt down rather than press in.\u003c\/p\u003e\n\u003cp\u003eTwo jobs come out of that. First, height: the post length is what actually determines your ejector home position, so it has to be right before the tool ever runs. Second, cleanliness — the posts hold the plate off the clamping face, so flash, swarf and broken pin fragments collect in the gap instead of under the plate. A plate resting directly on the clamping face will sit on the first chip that lands there and cock itself.\u003c\/p\u003e\n\n\u003ch2\u003eWhy we sell them in fours\u003c\/h2\u003e\n\u003cp\u003eThe four posts set the plane the ejector plate rests on. Replacing one worn post out of four leaves the plate tilted by exactly the amount that post has flattened — which is small, and which is why the resulting bent ejector pins and galled guide bushings usually get blamed on something else. If one has peened over enough to need replacing, the other three have taken the same number of returns.\u003c\/p\u003e\n\u003cp\u003eIf you are fitting a new tool, check all four heights against each other with a micrometer before assembly rather than trusting the tolerance.\u003c\/p\u003e\n\n\u003ch2\u003eChoosing a height\u003c\/h2\u003e\n\u003cp\u003eMeasure with the ejector plate fully returned and the mold closed. The post height sets the gap; the gap has to leave the return pin faces flush with the parting line and the ejector pins flush with the cavity. Get the post too tall and the ejector pins stand proud into the cavity at rest — every shot marks. Too short and the return pins bottom before the plate does, so the posts carry no load and the return pins take the impact instead.\u003c\/p\u003e\n\n\u003ch2\u003eThread and counterbore\u003c\/h2\u003e\n\u003cp\u003eEach size is listed with its mounting thread — M5, M6, M7 or M8 — because the same outside diameter is made with more than one thread. Ø15 comes in M5 and M6; Ø25 in M6, M7 and M8; Ø30 to Ø40 in M6 and M8. Check what is already in your plate before ordering, because the counterbore diameter and depth change with the thread and the screw has to sit below the post face.\u003c\/p\u003e\n\u003cp\u003eIf you are drilling new, the smaller thread in a given diameter leaves more material around the counterbore and is the safer choice unless you need the clamp load.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eS45C carbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eØ10, 15, 20, 25, 30, 35, 40, 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHeights\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 to 50 mm, depending on diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting thread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM5, M6, M7 or M8 — stated per size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCounterbore\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSized to the thread; confirmed on order if critical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePack quantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 pieces — one plate set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDanyang, Jiangsu, China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ch2\u003eA note on price and size\u003c\/h2\u003e\n\u003cp\u003eThe price ladder here is not a smooth function of diameter and height, because we price from actual supplier cost rather than fitting it to a curve. Some mid-range sizes run cheaper than smaller ones simply because they are made in higher volume. The numbers are the real figures, not a mistake.\u003c\/p\u003e\n\n\u003ch2\u003eLarger and taller posts\u003c\/h2\u003e\n\u003cp\u003eØ45 and Ø50 in taller sections, heights to 80 mm, and KO-post variants in M8 are all stocked — a set of four in those sizes runs to several kilograms and does not belong on a flat parcel rate. \u003ca href=\"\/pages\/request-a-quote\"\u003eRequest a quote\u003c\/a\u003e for those and we will price the freight properly against your destination.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eInternational freight is calculated on packed chargeable weight. See \u003ca href=\"\/pages\/shipping-delivery\"\u003eShipping \u0026amp; Delivery\u003c\/a\u003e for destinations and transit times. Import duties and taxes are the buyer's responsibility — please read the duties section on that page before ordering.\u003c\/p\u003e","brand":"Privley Mold Components","offers":[{"title":"Ø10 × 20 (M6)","offer_id":52468190478556,"sku":"PMC-STOP-001","price":7.9,"currency_code":"USD","in_stock":true},{"title":"Ø10 × 25 (M6)","offer_id":52468190511324,"sku":"PMC-STOP-002","price":7.9,"currency_code":"USD","in_stock":true},{"title":"Ø10 × 30 (M6)","offer_id":52468190544092,"sku":"PMC-STOP-003","price":7.9,"currency_code":"USD","in_stock":true},{"title":"Ø10 × 35 (M6)","offer_id":52468190576860,"sku":"PMC-STOP-004","price":7.9,"currency_code":"USD","in_stock":true},{"title":"Ø10 × 40 (M6)","offer_id":52468190609628,"sku":"PMC-STOP-005","price":7.9,"currency_code":"USD","in_stock":true},{"title":"Ø10 × 50 (M6)","offer_id":52468190642396,"sku":"PMC-STOP-006","price":9.9,"currency_code":"USD","in_stock":true},{"title":"Ø15 × 8 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