SONS OF LIBERTY BOLT CARRIER GROUP: Best Bolt Carrier in the industry! Bolt: Precision machined from Carpenter Technology No. 158 chrome-nickel alloy. Heat treated per mil-spec, Shot peened per ASTM B851/SAE AMS2430S, Vibratory tumbled. Individual high pressure/proof (HP) test. Full Auto test fired at assembly.Carpenter 158 Vs. 9310; If this is your first visit, be sure to check out the FAQ by clicking the link above. ... But Carpenter cares little or nothing about whether bolts made from 158 steel break prematurely or not. Carpenter has never made or even tested a single bolt, and doesn't warranty any of the bolts manufactured using it's 158 steel ...Apparently the 1b1b6 has a "158 Carpenter Steel bolt", opposed to a "AISI 9310 alloy steel" Bolt on the Nitrided one I'm looking at. Is one superior to the other, or a matter of preference? ... Bolts available in 9310 Steel or Carpenter 158. Obviously, Toolcraft will make whatever the customer wants. They might use different steels and do ...Simple, 9310 is an AISI standard grade tool steel which, when properly treated, actually makes it about 7% stronger than "mil-spec" Carpenter 158. The proof is in the numbers. The carrier material, 8620 is used for various aircraft and vehicular applications, has a superior toughness rating, and features solid overall strength properties.The bolt is machined from 158 tool steel for ultimate durability, has a Type 2 Bolt Face and a black O-ring insert on the extractor. This high quality bolt carrier group is a valuable addition to your 6.5 Grendel build. ... Carpenter 158 Steel. Cartridge Compatibility: 6.5 Grendel. Finish: Nitride / Melonite. Carrier Profile: M16. High Pressure ...Both are 8620 Tool Steel (Carrier) and 9310 Steel (Bolt) and are in my budget. Anybody have experience with these and want to offer their pros, cons and recommendations between the two? ... Sionics Phosphate BCG. 158 Carpenter Bolt, meticulously assembled and spec'ed out. It'll be a smidge more than $130 ($150 - ish), but you may find them on ...JSW Steel News: This is the News-site for the company JSW Steel on Markets Insider Indices Commodities Currencies StocksCarpenter 158 bolt, ground after heat treat, MPI and HPT; 9310 steel carrier, ground after heat treat; ... 5.56/.223/.300 BLK. 9310 Steel Bolt, Black Nitride. MPI Bolt (Magnetic Particle Inspected) Shot Peened Bolt. M16 Black Nitride Carrier. Nitride Gas Key. Grade 8 Hardened Fasteners. Key Staked per Mil-Spec. Black Extractor Insert. Crane O-Ring.Nov 8, 2016 · 0. C158, 8620, 9310 BCG Steel. These are the (3) most common BCG steels being used in today's AR/M4 industry (from what I read about). I know just a little bit about metallurgy, but, not enough to distinguish what comes into play when each steel is used for BCG's. My (2) AR's use 9310 steel for the BCG's.Quoted: As I understand it, Carpenter 158 is a case (surface) hardened steel where 8620 is through hardened. This would allow C-158 to be very hard on the outside to prevent wear and crack formation while the inside is softer and more flexible to prevent crack propagation and absorb shock loads. 8620 being through hardened can either be …Sep 5, 2023 · September 5, 2023 | 4:33 pm. When choosing high-performance bolts, steel type cannot be compromised. The steel used determines the bolt’s quality, strength, and durability. Among the various types of steel used in bolts, 9310 and C158 stand out as top contenders. Both are exceptionally strong and widely used in different industrial applications.Why 9310 Steel in an AR-15 / M16 Bolt? Why is 9310 Steel the superior option for your AR-15/M16 Bolt? Well, 9310 is actually around 7% stronger than Carpenter 158 and is better than "mil-spec." faxonfirearms.com. 9.Jan 1, 2020 · Bolt Carriers made from 8620 Steel, 6A1-4V Titanium or Aluminum. Keys made from 4130 Steel. Bolts available in 9310 Steel or Carpenter 158. Our products carry a lifetime warranty. Simply put Should any of our products fail, return it to us for a brand new replacement.The heat treatment process must be more closely controlled with 9310, from what I've read. I'm pretty sure Aermet 100 is a better steel than Carpenter 158 or SAE 9310. It's also made by Carpenter Technology Corporation. The Aermet 100 is about 3 times more expensive than Carpenter 158, but doesn't have lot minimums.Dec 12, 2023 · The most common is Carpenter 158 or C-158 steel, and the second most popular is 9310 steel. The exact difference between them is a lot of scientific talk but the easy version is that 9310-steel is about 7% stronger than C-158 when heat treated correctly. However, C-158 is Mil-Spec. Why is C-138 Mil-Spec if there is something better out there?Target said: I read an article by Faxon ( manufacturer of barrels and other parts) and they claim that 9310 steel is better than Carpenter 158. C158 is MilSpec and at the time. a good steel. 9310 is newer and 7% better. Faxon has a good reputation for barrels. so I will take their word on this.C-158 is simply Carpenters trade name for P-6 tool steel. P-6 and 9310 are very close in composition. The 9310 has some molybedenum while the P-6 has more chrome and nickel. 9310 is about half the cost of P-6. Which is better? Don't know, I barely made it through that class. IMO, the heat treat is probably more important than the alloy comp.Aermet 100 (Carpenter Technology Corporation), Ferrium C61 and Ferrium C64 (QuesTek Innovations, LLC)) after a preliminary evaluation of a larger material matrix that had consisted of, in addition, CCS42L, LESCO53, 32CDV13 and XD15NW ferrous alloys. Pyrowear 675 is a high strength stainless steel designed for gear application. Aermet …It also exhibits good strength, high toughness, hardenability, core strength, and very high fatigue strength. When annealed, 9310 has good ductility, machinability, and cold working properties. Additionally, 9310 is easily welded. It is typically used in gears, crankshafts, heavy-duty gears, the automotive, trucking, and aerospace industries.Milspec is C158. 9310 is very common in commercial bolts. Either will work. I'd still sooner use a nitride carrier over all others, with chrome second and other coatings including NiB down the list somewhere. In a 'two is one, one is none' philosophy, either material can be seen in broken bolts, but in a properly set up rifle it's rare ...Can somebody tell me what the difference is between c-158 and 9310 and why 9310 isn't mil-spec? I've seen 9310 used in some bolts and wonder if it's actually inferior. Is there technical data to show that c-158 is superior?Carpenter 158® (CarTech® No.158®) is a chrome-nickel alloy steel best suited for parts subject to heavy shock and wear. Carpenter 158 supplied by Rockwell Industries is ideally suited for jobs where an extra core strength is required. Fully treated, Carpenter 158 attains a core strength of approximately 160 ksi (1103 MPa) tensile strength ..."C158 vs 9130 bolt material" "Carpenter 158 9130 m16 bolt" "C158 9130 superior bolt material" Something along those lines... Someone please help me find this document as I believe that it's important info for the AR community to know. There are so many 9130 vs C158 threads and this could be the document that ends all of the arguments.Many Metallurgists consider AISI 9310 alloy steel as an acceptable bolt material and substitute for Carpenter 158 (Carpenters brand name AISI P6 Spec mold steel). However for the M4 purists we offer our BCG with the optional Carpenter 158 bolt made to current Mil-Spec including phosphate rather than Melonite treatment which comes with the 9310 ...The bolt is CNC machined from heavy duty 9310 alloy steel. 9310 steel has a high core & fatigue strength rating, a high hardenability rating, and when properly treated it is actually about 7% stronger than the "mil-spec" Carpenter 158 steel. The bolt is shot peened (stress relieved) and finished with the same Nickel Boron finish as the carrier.Bolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. Barrel: 16" Heavy Profile, Chrome Lined with A2 Flash Suppressor. Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel w. M4 Feed Ramps. Rifling: 1 Turn in 9" - Right Hand Twist. Stock: A2 Standard Stock.Quoted: As I understand it, Carpenter 158 is a case (surface) hardened steel where 8620 is through hardened. This would allow C-158 to be very hard on the outside to prevent wear and crack formation while the inside is softer and more flexible to prevent crack propagation and absorb shock loads. 8620 being through hardened can either be softer ...9310 Vac Melt is a high quality carburizing steel produced by a vacuum consumable electrode process. 9310 has a high hardenability, high core hardness and high fatigue strength. All of those aspects considered, 9310 steel is ideally suited for aircraft engine gear and pinon applications. 9310 Alloy Steel is manufactured for the purpose of case ...Fit: Semi-Auto or Full Auto AR-15/M16 (.223 or 5.56mm NATO) Material: Carrier (8620 Steel), Bolt (C158) Finish: Nickel Boron Plated. Extras: Properly Staked Gas Key. ACME Machine has been in business since 1976 crafting highly precise components. All ACME BCG parts are of the highest quality and 100% made in America.This BCG weighs a mere 7.9 ounces, but is full-auto ready and functions with 5.56, .223, .300 BLK, and .200 Ruger rounds. The carrier itself is machined from 6A1-4V titanium, while the bolt is sturdy 9310 tool steel. The entire assembly is coated with a diamond-like coating (DLC) for an extra rugged finish.Apr 29, 2017 · In contrast to this, LWD doesn't sell bulk steel, it sells products expected to perform beyond mil-spec requirements. But Carpenter cares little or nothing about whether bolts made from 158 steel break prematurely or not. Carpenter has never made or even tested a single bolt, and doesn't warranty any of the bolts manufactured using it's 158 steel.The most common material for AR-15 bolts is Carpenter 158 steel or Mil-Spec 9310 steel due to their high durability and tolerance to heat. Other materials that are sometimes used include titanium, which offers reduced weight but can be prone to wear over time; as well as various coatings like nickel boron or chrome that offer improved ...I bought one thinking it had a Carpenter 158 bolt according to the product description. The bolt I received is marked MPI 9310. The have subsequently changed the description to Carpenter No. 9310 steel. They claim the extractor is tool steel machined, however it and the gas key appear to be MIM.SKU 51655115274 Brand Palmetto State Armory Model Number 51655115274 UPC 51655115274 DETAILS Manufacturer: Toolcraft Caliber: 5.56/.223 Bolt Finish: Nitride Bolt Steel: Carpenter No. 158 Steel Profile: Full Auto Profile Gas Key: Grade 8 Hardened Fasteners, Staked per MilSpec FEATURES This Toolcraft Logo'd Nitride BCG is made with a carpenter 158 bolt with a full-auto profile, designed to be ...Engraved AR-15 Bolt Carrier Group (BCG) – AMERICAN FLAG. M16 Cut 9310 Steel Carrier Carpenter 158 Steel Bolt 4140 Steel Extractor Mil-Spec O-Ring Mil-Spec Gas Rings 4140 Steel Cam Pin 8740 Steel Firing Pin with Hard Chrome Finish Magnetic Particle Inspected Engraved In House Proudly Made In The USA Upper Receiver not included.Bolt Carriers made from 8620 Steel, 6A1-4V Titanium or Aluminum Keys made from 4130 Steel Bolts available in 9310 Steel or Carpenter 158 Our products carry a lifetime warranty. Simply put Should any of our products fail, return it to us for a brand new replacementLugs were a little more beefy, made from 9310 Vac Arc steel. Seemed to be a little more rugged looking than your standard mil. spec. bolt made from Carpenter 158. A few other minor differences. I have never installed or run this bolt before and was curious if anyone else has had any experience with bolts made from 9310 Vac Arc steel?Carpenter Technologies' 158 blend of steel was selected as it provided adequate strength and wear characteristics. It has been the "Mil-Spec" since. Since the creation of Carpenter 158, the metals industry has continued to innovate, creating new blends of steels. 9310 is a AISI standard grade of tool steel that makes it about ~7% stronger than ...4 days ago · This bolt carrier group is high pressure tested as well as magnetic particle inspected, and it’s shot peened for added durability. The bolt is Carpenter 158 steel and the carrier is 8620 steel. And it has a Mil-Spec phosphate, matte black finish. The BCG has a shrouded firing pin and works in both full-auto M16s and semi-auto AR-15s.Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.A short while back, I was on the phone with a few Carpenter Steel engineers looking for info. The first data sheet that mentions C-158 (or Carpenter No. 158) came out in 1981. ... Both 158 and 9310 can be had in a VAC melt grade which is the purest form of both alloys. Both alloys have apx the same strength depending on the heat treat.Conclusion. In conclusion, 9310 and 158 steel have unique properties and characteristics that make them ideal for certain applications. 9310 steel is tougher and more impact-resistant, while 158 steel is more corrosion-resistant. When choosing between the two, it's important to consider your project's specific requirements and needs.Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.9310 9310 VAC-ARC steel is a premium quality, high-grade chromium-nickel-molybdenum carburizing steel known for its high hardenability, core hardness, and exceptional fatigue strength. Produced through a vacuum consumable electrode process, 9310 ensures exceptional performance for demanding applications. This alloy is widelySimple, 9310 is an AISI standard grade tool steel which, when properly treated, actually makes it about 7% stronger than "mil-spec" Carpenter 158. The proof is in the numbers. The carrier material, 8620 is used for various aircraft and vehicular applications, has a superior toughness rating, and features solid overall strength properties.We did this for y’all, figured enough people asked so we would provide, expanded our bolt offerings to include five different AR15 bolts using carpenter 158 steel 5.56 standard 5.56 K-SPEC enhanced dual ejector LH 5.56 K-SPEC enhanced dual ejector 7.62x39 K-SPEC enhanced dual ejector 458/450 K-SPEC enhanced dual ejectorDefinition: Carpenter 158 steel is a high-strength, alloy steel specifically designed for use in critical firearm components such as bolt carriers, bolts, and barrels. Composition: It is primarily composed of iron, carbon, chromium, molybdenum, vanadium, and other alloying elements.The accompanying bolt is case hardened 9310 steel, shot peened, HPT and MPI tested, and finished in a self-lubricating polished black nitride. ...  Material: Case Hardened 9310 Steel. Carpenter 158 is available for an additional charge.  Finish: All Bolt components Shot Peened and Manganese Phosphate or Black NitrideWe also offer the Toolcraft DLC BCG with a 9310 grade tool steel bolt. This bolt steel is 7% stronger than even Carpenter 158 steel. Above: SpiceTac specifies MIL SPEC Carpenter 158 steel for the bolts in our Diamond DLC BCGs. Even great bolt steels like 9310 and C-158 won't overcome one weakness that the AR-15 has shown over the …If fact, 9310 response to thin section quenching is better that Carpenter 158. And, taking the leap between this statement:". . . by comparison to Carpenter 158, AISI 9310 has several elements present in its composition that are detrimental to fatigue while not being evident in the physical properties . . ." and this statement:4140 Steel Cam Pin. 8740 Steel Firing Pin with Hard Chrome Finish. Magnetic Particle Inspected. Available in AR-15 and AR-308 sizes. Engraved In House. Proudly Made In The USA. Engraved AR Bolt Carrier Group (BCG) - Spartan M16 Cut 9310 Steel Carrier Carpenter 158 Steel Bolt 4140 Steel Extractor Mil-Spec O-Ring Mil-Spec Gas Rings 4.High Strength Stainless Steels. An alloy is generally considered a high strength stainless steel when it meets several key requirements. First, it must have an ultimate tensile strength (UTS) of 225 ksi (1550 MPa) or more, and a minimum yield strength (YS) of 200 ksi (1378 MPa). Tensile ductility must be good, with a minimum 10% elongation ...When you temper a low-alloy steel like 8620, 9310 or Carpenter 158 at 1,050 degrees Fahrenheit, you kill their strength. There is nothing to be gained by nitriding a bolt that has already been case-hardened. ... 9310 or Carpenter 158, and 1,000 other steels. S7 is an air-hardening steel, which means it can be cooled very slowly in air and still ...What is the difference between Carpenter 158 and 9310 steel? Carpenter 158 is the military specification (mil-spec) for bolts. 9310 is a more modern steel which can be up to 8% stronger than Carpenter 158. They are both premium steels with a long and successful history of use in AR15 bolts. Either will serve you well!Mar 11, 2022 · Toughness of over 200 ft./lb. Charpy C-Notch. HRC of 46 yields a 15% increase in hardness at the same toughness comparing to Carpenter 158 & 9310. Mil-Spec Extractor and Ejector Springs, Gas Rings. While the two bolts have identical construction, the two coatings vary slightly.BCGs can be made of materials such as Carpenter 158 steel, 8620 steel, or 9310 steel, and are often coated with finishes like phosphate or nickel boron. 4. What is the significance of a properly staked gas key on a BCG?What is the difference between Carpenter 158 and 9310 steel? Carpenter 158 is the military specification (mil-spec) for bolts. 9310 is a more modern steel which can be up to 8% stronger than Carpenter 158. They are both premium steels with a long and successful history of use in AR15 bolts. Either will serve you well!Description. Description The NBS .223/5.56 DLC Bolt Carrier Group was designed with strength in mind. Starting with a 9310 Steel Bolt, which is aircraft-grade material, this bolt has a high core strength rating, a high fatigue strength, and a high hardenability rating. 9310 steel, when treated properly, is about 7% better than Carpenter 158 steel, so you know …Carpenter 158 comes from one place, and one place only, Carpenter Technology of Reading PA. AISI 9310 steel can be sourced from any number of foundries, Carpenter being one of them. Needless to say, 9310 is more easily obtainable. Posted: 12/16/2016 12:41:00 AM EDT. [#5]This is significantly stronger than the Carpenter 158 steel called out by the military and vastly superior to many materials used in civilian bolt production. What is S7 Tool Steel? a. The S-Type tool steel is specifically designed to resist the effects of shock at both high and low temperatures. What happens if I break your Relia-Bolt? a.Apr 10, 2024 · This Toolcraft DLC Bolt Carrier Group comes complete with a 9310 grade tool steel bolt. This bolt steel is 7% stronger than commonly used "mil-spec" Carpenter 158 steel. This tougher than mil-spec bolt, when paired with Toolcraft quality and the Ionbond DLC finish is quite likely the ultimate hard use bolt carrier group!. Bolt Material: Machined from Mag ParticlPremium 5.56 Nickel Boron BCG with Carpenter 158 Bolt - No L Both SAE-AISI 4140 steel and SAE-AISI 9310 steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown. For each property being compared, the top bar is SAE-AISI 4140 ... So should I look for a bolt that's Carpenter 158 or 9 This Toolcraft DLC Bolt Carrier Group comes complete with a 9310 grade tool steel bolt. This bolt steel is 7% stronger than commonly used "mil-spec" Carpenter 158 steel. This tougher than mil-spec bolt, when paired with Toolcraft quality and the Ionbond DLC finish is quite likely the ultimate hard use bolt carrier group!Bolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. Barrel: 16.5" Medium Profile, Chrome Lined with A2 Flash Suppressor. Barrel Material: 4150M Chrome Moly Vanadium 11595E Steel. Rifling: 1 Turn in 10" - Right Hand Twist - 6 Lands & Grooves. Stock: 6 Position Telescoping Buttstock w. TimberTec Camo Finish. When you temper a low-alloy steel like 8620, 9310 or...
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