On the hardenability of steel, 4140 heat treatment has good strength and good comprehensive mechanical properties, good manufacturability, high yield. The highest temperature is 427 degrees Celsius. 4140 strength, high hardenability, and good toughness, quenching deformation of small, high temperature creep rupture strength, and high.For each property being compared, the top bar is SAE-AISI 4140 steel and the bottom bar is SAE-AISI 9310 steel. SAE-AISI 4140 (SCM440, G41400) Cr-Mo Steel SAE-AISI 9310 (1.6657, G93106) Ni-Cr-Mo Steel. Metric Units US Customary Units. Mechanical Properties. Brinell Hardness: 200 to 310:Well, 9310 is actually around 7% stronger than Carpenter 158 and is better than "mil-spec." faxonfirearms.com FWIW, Right To Bear has Toolcraft 9310 BCGs for $80.A lot of manufacturers offer a completely 9310 steel bolt carrier group. Though, this is a relatively new phenomenon and some people prefer the tried-and-true 8620 and Carpenter 158 combination. From my perspective, however, 9310 is an excellent option and is objectively stronger than 8620 and Carpenter 158 steel. Thread: Carpenter 158 Vs. 9310. Thread Tools. Show Printable Version; 04-29-17, 04:58 #111. sig1473. View Profile View Forum Posts View Articles Member Join Date Oct 2013 Location IN Posts 539 Feedback Score 25 (100%) Originally Posted by AR-556.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?SAA AR-15 .223/5.56 Bolt Assembly Carpenter 158 - MPI Tested. Replacement Assembled Bolt for the .223/5.56/300AAC caliber AR-15 (or new builds). Assembled, Phosphate finished AR15 Bolt. Completely assembled with standard bolt parts: Extractor assembly, Ejector assembly, Gas Rings. Works with any AR15 standard Carrier of any finish (Phosphate ...Both SAE-AISI 4140 steel and SAE-AISI 8620 steel are iron alloys. Their average alloy composition is basically identical. For each property being compared, the top bar is SAE-AISI 4140 steel and the bottom bar is SAE-AISI 8620 steel. SAE-AISI 4140 (SCM440, G41400) Cr-Mo Steel SAE-AISI 8620 (SNCM220, G86200) Ni-Cr-Mo Steel.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 Vs. 9310 - Page 11May 12, 2016 · 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 "mil-spec" Carpenter 158 steels, when appropriately treated. 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: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.16 votes, 32 comments. 263K subscribers in the ar15 community. /r/ar15 is here for your favorite black gun links, build pics, questions and other…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.Stag Arms – Mil-Spec shot peened Carpenter 158 steel.440″ Bolt Face. 6.5 Grendel – Type 2 with .136″ Head Space; 7.62x39mm – Type 1 with .125″ Head Space; 6mm ARC – Type 2 with .136″ Head Space; Who Makes these? Maxim Firearms – 9310 Steel Stag Arms – Material not listed Underground Tactical – 9310 AQ Steel.473″ Bolt ...$ 185.00 $ 158.37 More Info. Sale! FREE SHIPPING ITEM! Ballistic Advantage 300 Blackout Performance Series 8.3 Hanson Barrel $ 210.00 $ 142.07 Add to cart. Sale! FREE SHIPPING ITEM! Ballistic Advantage 300 Blackout Performance Series 9 DRP Barrel $ 190.00 $ 134.81 More Info. Sale! FREE SHIPPING ITEM!The difference is in the steel. Many manufacturers will state that properly heat treated 9310 is approximately 7-8% "stronger" than 158, but 9310 requires that it be heat treated properly to achieve that increase in strength. Carpenter 158 is mil-spec, but many companies nowadays are opting for "stronger" steels like 9310 and S7 which are both ...Toolcraft DLC BCG 9310 556. TC556DLC-9310. $159.99. Add selected to cart. Description. Description. Free Shipping on all Toolcraft Bolt Carrier Groups! The Ionbond Diamond Like Carbon (DLC) finish is an incredibly hard (90 Rockwell) self-lubricating finish. This makes it extremely resistant to wear and corrosion.All Toolcraft BCG bolts are shot-peened, MPI and batch HPT to ensure quality and reliability. Made from either mil-spec Carpenter 158 steel or high strength 9310 steel, bolt carrier groups from Toolcraft are guaranteed to perform like new for thousands and thousands of rounds. You cannot buy a better bolt carrier group than a Toolcraft.9310 ALLOY STEEL – AMS 6265 VAR – UNS93106 DATA SHEET GENERAL CHARACTERISTICS: 9310 VAR AMS 6265 is a Chromium-Nickel-Molybdenum Alloy used as a Carburizing Grade for Aircraft Parts. Users can obtain high case hardness coupled with high core strength and toughness. High alloy content makes it suitable for use in relatively large cross-sections. Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or ...1.20. Zr-0.0C1%Hf (Grade 21) Zircaloy 2 (Grade 32) Zircaloy 4 (Grade 34) Spot Welding Equip. Thermodes (Hot-bars) ACF BONDING EQUIP. Machining. Have a look at our machinability rating graph which without a doubt will make your decision a lot easier with its incredibly detailed information.Carpenter No. 158 Bolt Steel. This is Mil-Spec steel for bolt fabrication and offered case hardened steel to prevent cracking and surface wear. Tensile Strength: 1103 MPa; Yield Strength: 931 MPa; 9310 Steel. Similar to Carpenter No. 158 and is used for both carrier and bolt manufacturing, it is more widely available and is more affordable.When comparing 8620 to Carpenter 158 you will notice that 158 has a much lower carbon content, and higher Chromium and Nickel content than 8620. 158 is truly an alloy metal, while 8620 is a low alloy metal. However in the world of steels that does not necessarily make it better but different.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?Posted: 7/17/2014 3:12:39 PM EDT. Sharps' Relia-Bolt has significantly come down on its price since its unveiling around the first of the year due to now being only $79.99. Being an S7 tool steel bolt with a NP3 finish for a hair less than $80, I decided to order one to try out in my upcoming build. I ordered it early Monday Morning, it shipped ...PSA Logoed Premium 5.56 Nickel Boron BCG with Carpenter 158 Bolt - 516446450 . Rating: 94%. Regular Price $199.99 Special Price $99.99. Add to Cart. Add to Wish ...The above mentioned 8620 steel is also used by manufacturers to make bolts for certain rifle models. For instance, it was extensively used in World War II for the M1 Garand rifle. Actually, the original M16 rifles also used bolts made of 8620 steel, but the US military found that the bolts were wearing out after 40,000 - 50,000 shots, which is ...Jan 16, 2021 · Been examining the differences between C158 and 9310 steel bolts for the AR platform, and now I'm more confused than before. C158 is supposed to technically be stronger than 9310, but many higher end BCG makers are now using 9310 instead of C158 for their bolts b/c they say 158 is antiquated and they have figured out how to make 9310 better than "mil-spec." Faxon uses 9310 in their bolts and ... #1 For when the gun store expert says, "If it ain't mil-spec, it ain't shit". The C158 specified for M16 bolts dates to the 60's. Technology has advanced a little since then. Why 9310 Steel in an AR-15 / M16 Bolt? Why is 9310 Steel the superior option for your AR-15/M16 Bolt?AR15 Toolcraft Nickel Boron BCG - 9310 Steel -or- Carpenter 158 Steel Bolt, MPI Inspected, expertly machined, and a hassle free Lifetime Warranty! Track Your Order. Need Help? Menu. Reloading. Once Fired Brass. Commercial Range Brass; ... 9310 Steel. Carrier Material: 8620 Steel. Manufacturer:Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. · Carpenter 158 is a case(surface) hardened steel where 8620/9310 is through hardened. Case hardening allows C-158 to be very hard on the outside to prevent wear …Carpenter 158 is a case (surface) hardened steel where 8620/9310 is through hardened. Case hardening allows 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. 8620/9310 being through hardened can either be softer and better at ...TOOLCRAFT NON-LOGOED PREMIUM 5.56 NICKEL BORON BCG WITH CARPENTER 158 BOLT... Home. Forums. New posts Search forums. What's new. New posts New media New media comments New profile posts Latest activity. Media. New media New ... They may have been as low as 29.99 for 9310, MPI, like the one pictured a few …M16 Nitride BCG | Full Auto Rated | Nitride Coating | 8620 Carrier | M16 Carrier | Tool 7 Steel Extractor | Viton O-Ring | 9310 Bolt.Toolcraft Logo'd Premium 5.56 Nickel Boron BCG with Carpenter 158 Bolt - 5165449729 . Rating: 93%. Regular Price $199.99 Special Price $99.99. Add to Cart. Add to Wish List Add to Compare. PSA Custom AR-15 Charging Handle Ambidextrous . Rating: 93%. $56.95. Add to Cart. Add to Wish List Add to ...Apr 29, 2017 · 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 …Nitriding baths range up to 1165°f. That is beginning to approach the temperatures where steels used for bolts, like Carpenter 158 begin to anneal (soften). Carpenter's data sheets on the 158 Alloy state that it begins to anneal at 1250°f, so it is possible that an over-temperature nitriding bath could begin to soften the bolt material.Carpenter ants are anywhere from 2.4 to 13 millimeters in length, and they are black, brown, red, orange or yellow, according to Orkin. The color and size of carpenter ants vary based on the species and even within a colony.Wilson combat has a 9310 steel Bolt Carrier Group on sale for $98.57, which is something like $70 off regular price. The three main BCGs I am looking at right now: PSA premium 158 Carpenter - was on sale for $109 when I put my order in Rainier Arms 158 Carpenter - on sale for $119 Wilson combat 9310 steel - on sale for $98.57.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.Bren · #2 · Aug 21, 2019. I looked at a couple of PSA kits recently and the only difference was that one had a 9310 bolt and one had a C158. I doubt it makes any difference, but the C158 is the mil spec, so it has been tried and tested a lot more for a lot longer, so I went with that.Product Description. SAA AR-15 .223/5.56 Bolt Assembly Carpenter 158 - MPI Tested. Replacement Assembled Bolt for the .223/5.56/300AAC caliber AR-15 (or new ...The most common is Carpenter 158 or C-158 steel, and the second most popular is 9310 steel. BOLT MATERIALS: CARPENTER 158 Vs 9310-STEELĪnother place different manufacturers try to stand out is what kind of steel they choose for their bolts.Though Carpenter 158 and 8620 steel are used for making Mil-Spec AR-15s, M4s, and M16s, many commercial manufacturers also use other materials. For instance, Faxon Firearms use 9310 Steel bolts for their BCG, and V Seven Weapon System offers a bolt carrier in Grade 5 Titanium. These materials are actually stronger than Mil-Spec steel and are ...Jul 7, 2023 · On the other hand, Carpenter 158 steel is chosen for its toughness, shock resistance, and fatigue strength. As such, it sees use in firearm components, gears, shafts, and general machinery. What Is the Difference Between 9310 Steel and 8620 Steel? 9310 steel and 8620 steel are low-alloy steels with some key differences between them. Cabinet design software has become an essential tool for designers, carpenters, and homeowners who want to create custom cabinets. However, not everyone has the budget to invest in expensive software.Feb 15, 2020 · Carpenter 158 is mil-spec, but many companies nowadays are opting for "stronger" steels like 9310 and S7 which are both tool steels used in large machines. …AIM Surplus Bolt Carrier Review. I just received the AIM surplus bolt carrier, which many of you may know about due to its amazingly low price of $79 dollars shipped. What interested me was the bolt material. Typically the AR15 community looks for C-158 which is a blend of steel from Carpenter. 9310 is also a Carpenter product, but the …Feb 15, 2020 · Carpenter 158 is mil-spec, but many companies nowadays are opting for "stronger" steels like 9310 and S7 which are both tool steels used in large machines. …Mar 8, 2020 · Well, 9310 is actually around 7% stronger than Carpenter 158 and is better than "mil-spec." faxonfirearms.com FWIW, Right To Bear has Toolcraft 9310 BCGs for $80. C 158 vs 9310 Bolt Just ordered a Aero Precision 6.5 bcg with bolt. Bolt is made of 158 carpenter instead of the 9310 i notice most others are. Is the 158 going to hold up fine its a hunting rig for a buddy that probly wont see a lot of rounds. Im sure ...Bren · #2 · Aug 21, 2019. I looked at a couple of PSA kits recently and the only difference was that one had a 9310 bolt and one had a C158. I doubt it makes any difference, but the C158 is the mil spec, so it has been tried and tested a lot more for a lot longer, so I went with that.It is a super hard finish that runs smooth and is both easy to clean and easy on the wallet. For a comparison of the top 3 black BCG finishes see our article The Best Black BCG Finish - Phosphate vs …Perhaps this is the wrong outlet to make this question, but can anyone tell me the difference in reliability and longevity between a bolt made from 9310 steel and Carpenter 158 steel? Does one resist shearing better but is more brittle, I assume something along those lines is the difference.Feb 11, 2017 · 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? 3. Toolcraft LOGO’D Premium 5.56 Nickel Boron BCG W/ Carpenter 158 Bolt. Number 3 on this list of the best PSA BCGs is the Toolcraft Logo’d Premium 5.56 Nickel Boron BCG with Carpenter 158 Bolt. Now you may be saying to yourself, that this is a Toolcraft BCG not a PSA BCG, but here’s the deal, Toolcraft makes a lot of BCGs for …Jun 4, 2016 · 9310 has a better charpy rating which should help to keep the lugs from ripping off the body of the bolt. From what I understand is what is said above. 158 has to be bought in bulk to make it worth while and affordable. The 9310 is cheaper to buy in smaller quantities. Stag Arms – Mil-Spec shot peened Carpenter 158 steel.440″ Bolt Face. 6.5 Grendel – Type 2 with .136″ Head Space; 7.62x39mm – Type 1 with .125″ Head Space; 6mm ARC – Type 2 with .136″ Head Space; Who Makes these? Maxim Firearms – 9310 Steel Stag Arms – Material not listed Underground Tactical – 9310 AQ Steel.473″ Bolt ...Toolcraft BCGs are generally available with bolts made from either 9310 or Carpenter 158 steel. They are batch High Pressure Tested (HPT) and every bolt is Magnetic Particle Inspected (MPI). Markings on the bolts vary with some being marked MP or MPI and some being marked 9310 or C158.Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.CarTech® No.158®Alloy Page:1of7 Identification UNSNumber • T51606€ TypeAnalysis Singlefiguresarenominalexceptwherenoted. Carbon 0.10 % Manganese 0.50 % Silicon ...Toolcraft .223/5.56/300 BLK M16 Profile Bolt Carrier Group Nickel Boron Carpenter 158 Steel - $109.95 (Free S/H over $175) $109.95. Description 0 0 0. UPC: MPN: AR15Discounts 263 ... Why 9310 instead of Mil-Spec Carpenter 158 steel? 0 0 0. UPC: MPN: TOOAUTO-016; Dirty Bird Industries Compare prices for this product 115Thread: Carpenter 158 Vs. 9310. Thread Tools. Show Printable Version; 04-29-17, 14:46 #121. AR-556. View Profile View Forum Posts View Articles Member Join Date Aug 2016 Location The South Posts 190 Feedback Score 0. Originally Posted by Eurodriver.Our bolt assemblies are shot-peened and made from 9310. They are batch high pressure ... 9310 or carpenter 158. Finish: Black Nitride. Continue Browsing. Linear ...TOOLCRAFT NON-LOGOED PREMIUM 5.56 NICKEL BORON BCG WITH CARPENTER 158 BOLT... Home. Forums. New posts Search forums. What's new. New posts New media New media comments New profile posts Latest activity. Media. New media New ... They may have been as low as 29.99 for 9310, MPI, like the one pictured a few …LocationCalifornia. Posted July 20, 2014. I have been partial to the Carpenter 158 material for bolts but, there are quite a few available in 9310. I know 9310 alloy steel is very strong (they make differential ring and pinion gears for professional class drag racing cars. from it!) but on the M16/M4 the mil-spec is C158 - what is the preferred ...Carpenter ant infestations are indicated by piles of wood shavings, the presence of smooth holes in wood and the emergence of large, winged ants from the structure. Worker ants don’t have wings and aren’t necessarily a sign of an infestatio...There are different grades of 9310. Vac Arc being the highest. More and more bolts are being made from it because of availability. 158 is controlled by Carpenter and you have minimum weight orders to meet or they will not sell to you. Some say 9310 has a slight advantage over 158, but looking at the chemical makeup, they are very similar.9310 Steel. This steel is more readily available than the Carpenter No. 158 and is used for both carrier and bolt manufacturing, but isn’t inferior in strength or durability. Less expensive, it helps influence quality parts at a more affordable price. Tensile Strength: 910 MPa; Yield Strength: 570 MPa; 8620 SteelBut 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. Conversely, LWD provides a lifetime guarantee on the bolt they engineered, tested, and manufactured …The Insider Trading Activity of CARPENTER ROBERT J on Markets Insider. Indices Commodities Currencies StocksNov 14, 2013 · Thread: Carpenter 158 Vs. 9310. Thread Tools. Show Printable Version; 11-14-13, 18:32 #11. Mr blasty. View Profile View Forum Posts View Articles Member Join Date ... ... vs Semi-Auto Bolt Carrier Groups; Mil-Spec Bolt Carrier Groups; HPT and MPI Tested ... except that the bolt is made of 9310 steel instead of Carpenter 158. The ...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. Here’s the information on both the DLC and NiB-X coatings. Technical Data on DLC Coating …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. Conversely, LWD provides a lifetime guarantee on the bolt they engineered, tested, and manufactured …I'm building an AR pistol and looking for ideas. I have a few parts and a lot of ideas but suggestions are welcome, thanks! When it comes to BCGs, I'lCarpenters use math for measuring and cutting, for determining the amount of material and manpower required for a job and for determining the amount to bid for a particular job. Carpenters must understand addition, subtraction, multiplicati...In the case of the M16 family, the US military selected a steel called Carpenter 158 (also known as "C158" or "Car 158") to be used for manufacturing the bolt. Therefore, any AR15 or M16 bolts that claim to follow military specifications (or "mil-spec" for short) should be made of C158 steel as one of the requirements.Thread: Carpenter 158 Vs. 9310. Thread Tools. Show Printable Version; 04-29-17, 14:46 #121. AR-556. View Profile View Forum Posts View Articles Member Join Date Aug 2016 Location The South Posts 190 Feedback Score 0. Originally Posted by Eurodriver.Those pits rusted and cracked more until the bolt failed. There is a long article on the internet somewhere..Google. 158 was chosen as a better material to replace 8620, 9310 was not around then, the standard has not been changed. Both 158 and 9310 can be had in a VAC melt grade which is the purest form of both alloys.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 Vs. 9310 - Page 10Carpenter 158 is 9310 with case hardening It's not, Carpenter 158 is a propitiatory steel alloy. It has similar (arguably superior) properties to 9310 but it is not 9310.Sep 5, 2023 · For applications that require excellent toughness, w, Toolcraft Logo'd Premium 5.56 Nickel Boron BCG with Carpenter 158 Bolt - 5165449729 . Rating: 93, Np. The firearmhistory had some great info. I suppose can 9310 be a better bolt m, Looks like a $10 "premium" for the black nitrate over the phos, It is a super hard finish that runs smooth and is both easy to clean and easy on the wa, The difference is in the steel. Many manufacturers will state tha, 9310 Steel, Carpenter 158. Coating Type: Diamond-Like Carbo, The Aero PRO BCG is a fairly new addition to Aeros lineup. This i, LocationCalifornia. Posted July 20, 2014. I have been partial to the , Build a list of your favorite alloys. Click the heart icon on any , They are both excellent. 9310 has a small amount of molybdenum, , Firearm Discussion and Resources from AR-15, AK-47, Jul 11, 2020 ... 9310 is a far more widely used material in the, Firearm Discussion and Resources from AR-15, AK-47, Handguns and m, The most common is Carpenter 158 or C-158 steel, and the secon, The 9310 steel is another common material for bolts and carriers, Firearm Discussion and Resources from AR-15, AK-47, Handgu, HRC of 46 yields a 15% increase in hardness at the sa.