Threaded-Nuts
Threaded - Nuts
ASTM A194, Latest Revision, Grade 2H
Suitable for high temperatures and high-pressure conditions.
ASTM A194, Grade 2HM
Similar to 2H nuts except this grade is designed for use in corrosive environments.
ASTM A194, Latest Revision, Grade 4
Heat-treated molybdenum steel nuts suitable for severe temperature and pressure conditions.
ASTM A194, Latest Revision, Grade 7L
New stamping as per ASTM is 7L. Heat-treated chrome-molybdenum steel nuts suitable for extreme temperature and pressure conditions. Suitable for sub-zero service conditions and have minimum Charpy impact values of ASTM spec. A320. Grade 7 down to 150°F.
ASTM A194, Grade 7ML
New stamping as per ASTM is 7ML. Similar to grade 7L nuts except this grade is designed for use in corrosive environments.
ASTM A194, Grade 8/8M
Stainless steel nuts designed for use in corrosive environments.
Fastener Coatings
Surface Preparation
Xylan coatings (or any thin-film coating) cannot by themselves provide complete corrosion protection. For maximum performance, primers or pretreatments are required.
Types of corrosion-mitigating coatings
These fall into three common categories: barrier, inhibitive and sacrificial.
- A barrier coating stands between the metal fastener and the environment. This is usually an organic coating with fillers that help stop moisture or vapor from permeating the film to the metal and becoming an electrolyte.
- An inhibitive coating is usually an organic coating with corrosion inhibitors, such as zinc phosphates, and chromates. In addition to acting as barriers, they help prevent corrosion by using pigments that provide an inhibitive effect, reacting with the absorbed moisture in the coating, then reacting with the steel to passivate it and decrease its corrosive characteristics.
- A sacrificial coating is usually a metal or inorganic coating containing metal particles (oFen zinc). If the coating is damaged, they act as a sacrificial anode and corrode to protect the steel substrate, sacrificing themselves by galvanic action. These can also be electroplated like zinc or cadmium.
Zinc Electroplating
Zinc electroplating line provides quick turnaround and cost-effectiveness for your plated bolt requirements.
Our zinc plating process, with clear trivalent conversion, offers:
- Hexavalent Chrome Free processing eliminates the toxic chemicals found in yellow chromate.
- Excellent Corrosion Resistance—Exceeding that of yellow chromate, and achieving 200-400 hours to white corrosion in ASTM B-117 Salt Spray.
- Increased Temperature Tolerance to 300-400°F for many hours with no effect on corrosion resistance or color.
- Cost-Effective - This new clear chromate costs no more than yellow chromate.
Xylan®Overview
Xylan has long been the benchmark of our line of industrial coatings. Registered in most countries around the world, Xylan is used to identify our low-friction, wear-resistant composites of fluoropolymers and reinforcing binder resins.
They are first and foremost dry-film lubricants; however, they have many desirable secondary properties. These lubricants are combined in a matrix with the newest high-temperature organic polymers resulting in “plastic alloys” formulated to provide unique and desirable properties. They can “work” under heavy loads, at high temperatures, in chemical and corrosive environments, and combinations thereof. In the industrial world, they are known as “extreme performance coatings.”
Ten reasons why you should use Xylan coatings:
- Low friction: CoF as low as 0.02.
- Wear resistance: even under extreme pressures.
- Corrosion and chemical resistance in most environments.
- Weather resistance.
- Wide temperature operating range.
Xylan 1070
Xylan 1070 general-purpose coatings were the first Xylan fastener coatings, introduced in the mid-1970s and still going strong. They provide outstanding lubrication for predictable makeup and break-out torque, and they have outstanding chemical resistance.
Temperature Range: -425°F (-255°C) to 550°F (290°C) continuously.
Xylan 1070 has added corrosion inhibitors.
Xylan 1424
Xylan 1424 is the environmentally friendlier version of the 1000 series coatings. Xylan 1424 series coating can be made in any color, including white. They also have better chemical resistance to bases than the 1000 series.
Xylan 1424 series reaches complete cure at 400°F (205°C), ideal for most coating operations.
Xylan 1424 series coatings work best for one-time installations, where the fastener will be coated, installed, and let alone.
Temperature Range: -40°F (-40°C) to 350°F (175°C).
6. Flexible curing schedule: ambient to 750°F (400°C).
7. Wide color range: color-code your product.
8. Pliability.
9. Machinability.
10. Excellent adhesion
Mechanical Requirements
ASTM A193/A193M
ASTM A194/A194M
ASTM A320/A320M
STUDS
STUDS NOTES
- To meet the tensile requirements, the Brinell hardness shall be over 200 HB (93 HRB).
- Class 1 is solution treated. Class 2 is solution treated and strain hardened. Austenitic steels in the strainhardened condition may not show uniform properties throughout the section particularly in sizes over 3/4” in diameter.
- For sizes 3/4” in diameter and smaller, a maximum hardness of 241 HB (100 HRB) is permitted.
- To meet the tensile requirements, the Brinell hardness shall not be less than 200 HB or 93 HRB.
| ASTM A193 ASTM A320 |
MINIMUM TEMPERING TEMP. °F (°C) |
TENSILE STRENGTH MIN. KSI (MPA) |
YIELD STRENGTH MIN. KSI. (MPA) |
ELONGATION 2" (50mm) MIN. % |
REDUCTION OF AREA MIN. % |
HARDNESS MAXIMUM |
|
|---|---|---|---|---|---|---|---|
| GRADE | SIZE | ||||||
| B7 | 2-1/2” and under | 1100 (593) | 125 (860) | 105 (725) | 16 | 50 | 321 HB (35HRC) |
| over 2-1/2” to 4” | 1100 (593) | 115 (790) | 95 (655) | 16 | 50 | 321 HB (35HRC) |
|
| B7M Note 1 |
2-1/2” and under | 1150 (620) | 100 (690) | 80 (550) | 18 | 50 | 235 HB (99HRB) |
| over 2-1/2” to 4” | 1150 (620) | 100 (690) | 80 (550) | 18 | 50 | 235 HB (99HRB) |
|
| ASTM A193 ASTM A320 |
MINIMUM TEMPERING TEMP. °F (°C) |
TENSILE STRENGTH MIN.KS1 (MPA) |
YIELD STRENGTH MIN. KSI (MPA) |
ELONGATION 2" (50mm) MIN. % |
REDUCTION OF AREA MIN. % |
HARDNESS MAXIMUM |
|
|---|---|---|---|---|---|---|---|
| GRADE | SIZE | ||||||
| L7 | 2-1/2” and under | Quenched and Tempered 1100 (593) |
125 (860) | 105 (725) | 16 | 50 | |
| L7M Note 4 |
2-1/2” and under | Quenched and Tempered 1150 (620) |
100 (690) | 80 (550) | 18 | 50 | 235 HB (99HRB) |
| ASTM A193 ASTM A320 |
MINIMUM TEMPERING TEMP. °F (°C) |
TENSILE STRENGTH MIN. KSI (MPA) |
YIELD STRENGTH MIN. KSI. (MPA) |
ELONGATION 2" (50mm) MIN. % |
REDUCTION OF AREA MIN. % |
HARDNESS MAXIMUM |
|
|---|---|---|---|---|---|---|---|
| GRADE | SIZE | ||||||
| B8 Class 1 Note 2, 3 |
All Diameters |
Carbide Solution Treated |
75 (515) | 30 (205) | 30 | 50 | 223 HB (96HRB) |
| B8 Class 2 Note 2 |
3/4” and under | Carbide Solution Treated and Strain Hardened | 125 (860) | 100 (690) | 12 | 35 | 321 HB (35HRC) |
| over 3/4” to 1” |
115 (790) | 80 (550) | 15 | 35 | |||
|
over 1” to 1-1/4” |
105 (725) | 65 (450) | 20 | 35 | |||
| over 1-1/4” to 1-1/2" |
100 (690) | 50 (345) | 28 | 35 | |||
| ASTM A193 ASTM A320 |
MINIMUM TEMPERING TEMP. °F (°C) |
TENSILE STRENGTH MIN. KSI (MPA) |
YIELD STRENGTH MIN. KSI. (MPA) |
ELONGATION 2" (50mm) MIN. % |
REDUCTION OF AREA MIN. % |
HARDNESS MAXIMUM |
|
|---|---|---|---|---|---|---|---|
| GRADE | SIZE | ||||||
| B8M Class 1 Note 2, 3 |
All Diameters |
Carbide Solution Treated |
75 (515) | 30 (205) | 30 | 50 | 223 HB (96HRB) |
| B8M Class 2 Note 2 |
3/4” and under | Carbide Solution Treated and Strain Hardened | 110 (760) | 95 (655) | 15 | 45 | 321 HB (35HRC) |
| over 3/4” to 1” |
100 (690) | 80 (550) | 20 | 45 | |||
|
over 1” to 1-1/4” |
95 (655) | 65 (450) | 25 | 45 | |||
| over 1-1/4” to 1-1/2" |
90 (620) | 50 (345) | 30 | 45 | |||
NUTS
| ASTM A-194 | ASME SA-194 | MINIMUM AVERAGE TEMPERING |
BRINELL HARDNESS |
ROCKWELL HARDNESS |
||
|---|---|---|---|---|---|
| GRADE | CLASS AND SIZE | TEMP °F (°C) | C SCALE | B SCALE | |
| 2H | Up to and including 1-1/2" | 850 (455) | 248 - 327 | 24 - 35 | 95 min. |
| Over 1-1/2" | 212 - 327 | 35 max. | |||
| 2HM | All Sizes | 1150 (620) | 159 - 235 | 84 to 99 | |
| L7M | All Sizes | 1150 (620) | 159 - 235 | 84 to 99 | |
| 7L | All Sizes | 1100 (595) | 248 - 327 | 24 - 35 | |
| B8 and B8M | All Sizes | 126 - 300 | 32 max | 60 min | |
* In order to meet the tensile requirements, the hardness shall be no less than 200 HB or 93 HRB .
Impact Energy Absorption Requirements
Bolting for Low-Temperature Service
| ASTM A320 | A320M | MINIMUM AVERAGE IMPACT VALUE FOR EACH SET OF 3 SAMPLES 10 x 10 x 50mm K. - lbs. (Joules) |
|
|---|---|---|
| GRADE | TEST TEMP. °F (°C) |
|
| L7 | -150 (-101) | 20 (27) |
| L7M | -100 (-73) | 20 (27) |
| L43 | -150 (-101) | 20 (27) |
