ASTM A194/A194M Grade 8M Heavy Hex Nuts Stainless Steel 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% |
This video is brought to you by Best Buy Golf Carts in North Florida. The technician’s name is Johnathan and the narrator is the owner: Michael K. Rosenbarker. The video demonstrates how to check the rear axle fluid in an Ezgo Txt and the Club Car DS and Precedent models as well. Please enjoy, click like and share the video. We hope that you find it helpful for that is why we made it. MKR
Subscribe to our channel for the latest updates and more! In this video we look at how to place ice screws. Ice screws offer protection for the lead climber in the event of a fall, the same way cams and stoppers do in rock climbing. Below are the steps for placing ice screws:
Step 1: Turn one foot sideways if possible to help create a more comfortable stance while placing the screw.
Step 2: Place the screw at waist level. This position allows the climber to maximize power without compromising balance. Placing a screw in a higher position minimizes power and affects balance.
Step 3: Begin by pushing and twisting the screw into the ice until the teeth bite and hold the screw in place. Note that the angle should be slightly lower than perpendicular, as this is the strongest and most effective angle to place a screw (the strength actually comes from the threads pulling against the ice).
Step 4: Pop out the “turbo” or crank, and continue screwing the piece into the ice. Be sure to return the crank to the original position, as the rope can potentially catch on this in a fall. These cranks, such as the “turbo” on the Black Diamond screw, have been rumored to sever ropes. You must return the crank to the original position!
Step 5: Chip away any weaker surface ice around the screw that may have cracked during the placement, and set the screw so the hanger is flush with the ice and hanging downward.
Please note that best practice / pull tests show we should back off the screw a bit, rather than over-crank it to get the hanger to sit flush on the ice. You can damage the thread placements by cranking the screw with too much force. This means if the hanger sits flush with the ice but is in the upward direction, it is best to un-thread a half turn to get the hanger to hang down, instead of cranking it tighter.
Step 6: Once the screw is screwed in up to the hanger, clip a quickdraw to the hanger. Then clip your rope into the lower carabiner of the quickdraw, just like sport climbing. Be sure to avoid back-clipping the rope. For more on this see our video on “Avoid Back-Clipping” [hyperlink to video].
Below are a few additional considerations when placing screws:
- More often than not, the leader will need to place the screw with one hand, especially on steeper ice. This makes the first step, which is getting the teeth to bite, the trickiest, and the most likely time you could drop a screw. No dropping!
- Strength of the screw placement depends on the quality of the ice you place it in:
Good = Cold, Clear, Dry
Bad = Soft, Warm, Wet
We hope you found this video helpful. Feel free to comment below with questions or thoughts!
Please remember, climbing is inherently dangerous. Climb at your own risk. Please visit https://ClimbingTechTips.com for related comments, additional videos, and community feedback!