ASTM A194/A194M 7 Heavy Hex Nuts
API 6A Flange Valve Wellhead Heavy Hex Nuts
Dimension Standard: ASME B18.2.2, ASME B18.2.4.6M, ISO 4033, Din934 H=D
Inch Size: 1/4”-4”
Metric Size: M6-M100
Other Available Grade:
ASTM A194/A194M 2H, 2HM, 4, 4L, 7, 7L, 7M, 8, 8M, 16 and so on.
Finish: Plain, Black Oxide, Zinc Plated, Zinc Nickel Plated, Cadmium Plated, PTFE etc.
Packing: Bulk about 25 kgs each carton, 36 cartons each pallet
Advantage: High Quality, Competitive Price, Timely Delivery,Technical Support, Supply Test Reports
Please feel free to contact us for more details.
ASTM A194
The ASTM A194 specification covers carbon, alloy and stainless steel nuts intended for use in high-pressure and/or high-temperature service. Unless otherwise specified, the American National Standard Heavy Hex Series (ANSI B 18.2.2) shall be used. Nuts up to and including 1 inch nominal size shall be UNC Series Class 2B fit. Nuts over 1 inch nominal size shall be either UNC Series Class 2B fit or 8 UN Series Class 2B fit. High strength ASTM A194 grade 2H nuts are common in the marketplace and are often substituted for ASTM A563 grade DH nuts due to the limited availability of DH nuts in certain diameters and finishes. Grades| 2 | Carbon steel heavy hex nuts |
| 2H | Quenched & tempered carbon steel heavy hex nuts |
| 2HM | Quenched & tempered carbon steel heavy hex nuts |
| 4 | Quenched & tempered carbon-molybdenum heavy hex nuts |
| 7 | Quenched & tempered alloy steel heavy hex nuts |
| 7M | Quenched & tempered alloy steel heavy hex nuts |
| 8 | Stainless AISI 304 heavy hex nuts |
| 8M | Stainless AISI 316 heavy hex nuts |
Mechanical Properties Grade Identification Markings
| Grade Identification Marking5 | Specification | Material | Nominal Size, In. | Tempering Temp. °F | Proof Load Stress, ksi | Hardness Rockwell | See Note | |
| Min | Max | |||||||
| ASTM A194 Grade 2 | Medium Carbon Steel | 1/4 - 4 | 1000 | 150 | 159 | 352 | 1,2,3 | |
| ASTM A194 Grade 2H | Medium Carbon Steel, Quenched and Tempered | 1/4 - 4 | 1000 | 175 | C24 | C38 | 1,2 | |
| ASTM A194 Grade 2HM | Medium Carbon Steel, Quenched and Tempered | 1/4 - 4 | 1000 | 150 | 159 | 237 | 1,2,3 | |
| ASTM A194 Grade 4 | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 - 4 | 1100 | 175 | C24 | C38 | 1,2 | |
| ASTM A194 Grade 7 | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 - 4 | 1100 | 175 | C24 | C38 | 1,2 | |
| ASTM A194 Grade 7M | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 - 4 | 1100 | 150 | 159 | 237 | 1,2,3 | |
| ASTM A194 Grade 8 | Stainless AISI 304 | 1/4 - 4 | - | 80 | 126 | 300 | 4 | |
| ASTM A194 Grade 8M | Stainless AISI 316 | 1/4 - 4 | - | 80 | 126 | 300 | 4 | |
| NOTES: 1. The markings shown for all grades of A194 nuts are for cold formed and hot forged nuts. When nuts are machined from bar stock, the nut must additionally be marked with the letter 'B'. The letters H and M indicate heat treated nuts. 2. Properties shown are those of coarse and 8-pitch thread heavy hex nuts. 3. Hardness numbers are Brinell Hardness. 4. Nuts that are carbide-solution treated require additional letter A - 8A or 8MA. 5. All nuts shall bear the manufacturer’s identification mark. Nuts shall be legibly marked on one face to indicate the grade and process of the manufacturer. Marking of wrench flats or bearing surfaces is not permitted unless agreed upon between manufacturer and purchaser. Nuts coated with zinc have an asterisk (*) marked after the grade symbol. Nuts coated with cadmium shall have a plus sign (+) marked after the grade symbol. 6. Other less common grades exist, but are not listed here. Inch Fastener Standards. 7th ed. Cleveland: Industrial Fasteners Institute, 2003. N-80 - N-81. | ||||||||
| Element | 2, 2H, and 2HM | 4 | 7 and 7M (AISI 4140) | 8 (AISI 304) | 8M (AISI 316) |
|---|---|---|---|---|---|
| Carbon | 0.40% min | 0.40 - 0.50% | 0.37 - 0.49% | 0.08% max | 0.08% max |
| Manganese | 1.00% max | 0.70 - 0.90% | 0.65 - 1.10% | 2.00% max | 2.00% max |
| Phosphorus, max | 0.040% | 0.035% | 0.035% | 0.045% | 0.045% |
| Sulfur, max | 0.050% | 0.040% | 0.040% | 0.030% | 0.030% |
| Silicon | 0.40% max | 0.15 - 0.35% | 0.15 - 0.35% | 1.00% max | 1.00% max |
| Chromium | 0.75 - 1.20% | 18.0 - 20.0% | 16.0 - 18.0% | ||
| Nickel | 8.0 - 11.0% | 10.0 - 14.0% | |||
| Molybdenum | 0.20 - 0.30% | 0.15 - 0.25% | 2.00 - 3.00% |
Centering a drill bit is always the toughest part of drilling a broken bolt. An off-center drill hole causes the surrounding threads to be ruined. With Quikcenter the drill is perfectly centered in the broken bolt so you can step up to larger drill bits until the bolt is drilled out so thin that it will fall out of the hole leaving the threads intact. Then I run a tap through the hole to make sure it is clean. The original threads are ready to use again. I got mine from www.quikcenter.com and wanted to share for anyone with a similar problem. It’s a must-have for every mechanic and hobbyist & its very affordable.
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• Direct fit for the 2015+ Subaru WRX and STI
• Extremely aggressive turbo and exhaust tone under acceleration and boost
• Designed with oval mufflers to prevent highway drone
• Installs in under an hour
• Quad 3.5″ staggered double-wall polished tips
• Full 304 stainless steel mandrel-bent construction
• Dyno-proven maximum gains of up to 9 whp and 8 wtq and peak gains of up to 4 whp and 3 wtq, using 93 octane fuel while maintaining safe AFRs on the stock tune (2015 WRX with CVT)
• TIG-welded to perfection
• 3″ to 2.25″ exhaust split helps maintain proper exhaust velocity
• Mates with Mishimoto, stock, or most aftermarket downpipes
• Made in the USA
• Mishimoto Lifetime Warranty
Model: MMEXH-WRX-15
Learn how to install your new 2015+ WRX and STI Cat-Back Exhaust!
Installation Guide:
Parts List
(1) Stainless Steel Midpipe w/ 2-bolt flange
(1) Stainless Steel Midpipe to Y section
(2) Staineless Steel Mufflers w/ quad 3.5″ staggered double-wall tips, polished
(2) 2.25″ v-band clamps
(1) 3″ exhaust band clamp
(1) 2-bolt flange gasket
(2) 3/8″ – 16 serrated flange hex nuts, stainless steel
(2) M10 washers, stainless steel
Mishimoto Lifetime Warranty
Tools Needed
12mm Ratchet Wrench
14mm Wrench
11mm Deep Socket
14mm Deep Socket
3/8″ Short Extension
3/8″ Drive Ratchet
Pry Bar
Silver Anti-Seize Lubricant
WD-40
Disclaimer
• Raise vehicle only on jack stands or on a vehicle lift.
• Allow vehicle to cool completely prior to attempting installation.
• Do not run the engine or drive the vehicle while overheating, as
serious damage can occur.
• Please dispose of any liquids properly.
• Mishimoto is not responsible for any vehicle damage or
personal injury due to installation errors, misuse, or removal
of Mishimoto products.
• Mishimoto suggests that a trained professional install all
Mishimoto products.
INSTALLATION INSTRUCTIONS
1. Raise the vehicle off the floor.
2. Disconnect the mid-pipe from the downpipe by removing the
two 12mm nuts and two 14mm bolts. (12mm ratchet wrench,
14mm wrench)
3. Remove the stock donut gasket by gently prying away from
the flange.
4. Disconnect the five rubber bushings for the exhaust-hangers.
(Pry bar and WD-40)
5. Lower the stock exhaust system.
INSTALLING THE MISHIMOTO EXHAUST
(For installation with a stock downpipe, you will need to reuse
your stock donut gasket and purchase the Mishimoto Subaru
Exhaust Adapter, 3” Downpipe-to-Stock Exhaust, P/N: MMEXHADAP-3DSE.
The stock exhaust bolts cannot be used with the
Mishimoto exhaust.)
1. Apply anti-seize lubricant to the two 14mm mid-pipe bolts,
and then install the washers.
2. Install the mid-pipe exhaust gasket.
3. Install the mid-pipe and hand-tighten the two 14mm nuts and
bolts. Make sure that the mid-pipe is oriented in the same
direction as the stock exhaust.
4. Make sure that all five of the rubber bushings for the exhaust
hangers are properly in place, and then attach the two mufflers.
Spray the hangers with WD-40 to help them slide into place.
5. Install the band clamp exhaust onto the mid-pipe. Make sure
the hardware faces the driver side.
6. Spray the rubber exhaust hanger with WD-40 and attach to
the Y-pipe.
7. Mate the mid-pipe to the Y-pipe and hand-tighten the
band clamp.
8. Connect the mufflers and Y-pipe with the V-band clamps.
Apply anti-seize lubricant to the threads of the V-band clamps
prior to installing them onto the Y-pipe.
9. Push up on the mufflers to make sure that clearance is set
correctly between the exhaust tips and the rear bumper.
Make adjustments if needed.
10. Tighten the mid-pipe to Y-pipe band clamp. (14mm deep
socket, 14mm wrench)
11. Tighten the V-band clamps. (11mm deep socket)
12. Tighten the mid-pipe bolts that connect to the downpipe.
(14mm wrench, 12mm ratchet)
13. You’ve just installed your new 2015+ Subaru WRX/STI
Cat-Back Exhaust. Enjoy!
Mishimoto does not recommend installing this cat-back exhaust
and the Mishimoto WRX Performance Air Intake with the stock
ECU programming. It is recommended that the customer retune
the vehicle’s ECU after installing the cat-back exhaust and
Performance Air Intake. Power gains will vary depending on the
type of ECU tune that is applied to the vehicle.