Atlas call their version Impacto, but 8620 is a more common designation I think. AISI/SAE 8620 which is suitable for case hardening. My old Atlas Steels handbook recommends an alloy steel (not a toolsteel) for kingpins. Silver steel is supplied unhardened and can be machined fairly easily. BTW, there is no way that 61HRC is "easily machinable" by normal methods. Silver steel is used for cutting tools and other through-hardened applications. Silver Steel (Drill Rod) is "01" toolsteel and not suitable as a kingpin. It has typical UTS 40-60 tons/in 2 (550-830 MPa) and typical yield strength of 35-50 tons/in 2 (480-690 MPa).Spinneyhill, sheet from the supplier - can I attach a pdf file? It is supplied tempered to 61 HRC and is easily machinable. I was thinking I could use it for this job. A specific recommendation would be outside my area of competence.Ī locally available steel is silver steel, made to BS1407. I think what is wanted is a steel designed to be case hardened while leaving a tough core. If an unsuitable steel is used, this may result in too high a hardness and low ductility (brittle and susceptible to fracture). Quenching after the case harden heat soak will re-harden the steel. That will conflict with the previous heat treat and temper for toughness. They are definitely softer under the surface, (put a file to a worn one) and glass hard on the surface, so I would go for a very tough grade of steel, machine, heat treat and temper for toughness, and then case harden and polish to exact size.Case hardening will require a long time at high temperature. I don't know that a silver steel hardened all the way through will fit the bill for the shock loading a king pin has to withstand. Never made a king pin before, but fitted "just a few" but looking at the job they have to do, it will need to be tough on the inside, and glass hard on the surface. If not a threaded draw key, drive in with a drift and stake with a center punch. Threaded draw keys don't always seat when drawn by the nut. Drive the draw key in with a hammer until it seats. No radius is a guaranteed failure in this application. Grind the draw key slot making sure to have the radius at both ends of the slot. I would suggest buying/borrowing a set of hardness files to know if it is Rc40, 45, 50 or 55. If it is softer than Rc60 it is probably through hardened 4140 or similar material as Tiers suggests. This is what is done for heavy truck king pins. That means machine it oversized with the flat, send it out for carburization then grind it back to round and the correct diameter. If it doesn't scratch, it was probably carburized. This will point you in the right direction.įirst run a file across the existing part in an area with no wear or rust. There is no additional charge for this.Try to determine the hardness first. If you're not seeing your best man anytime soon, why not have us send your card direct instead? Just send the us message you wish to be printed inside your card and make sure to add their address when you reach the checkout. This is part of our commitment to our planet to reduce single-use plastic. Your pin comes with it's own butterfly pin back, but for extra security use a locking pin back which are now available to add to your order here:Īs of all cards will be sent without a plastic 'outer' cellophane bag. Pin measures: 7 cm at highest point and 3.2cm at widest point. Greetings Card: A6 (approx 10.5cm W x 14.8cm H once folded) Please note that personalised cards will be printed onto a matt cardstock. Personalisation is now available! If you would like to personalise the text on the front of your greetings card, please select the 'Personalise' option from the dropdown and add your required text in the field below. Each card is blank inside, so there is plenty of room for your own message. Will you be my Best Man?"Įach pin and greetings card will come with its very own recycled kraft envelope. Your Hand of The Groom pin is then backed onto a black greetings card with the wording: This pin is designed to be a keepsake that will last the test of time.Īvailable in a choice of 3 metal colours: Made from entirely from metal, this isn't a cheap 3D printed or resin version. You won't find a Hand of The King pin with this quality, anywhere else! This Hand of the Groom card is the best way to 'pop the question' to your Best Man or Groomsman to be or as a Thank You gift to those that helped you tie the knot on your wedding day. Appoint your very own 'Hand of the Groom' with this very special lapel pin.
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