Monel Flat Head Screws
Monel Flat Head Screws
Monel® flat head screws, like Monel 400 and K500, are made from a nickel-copper alloy and exhibit high strength, toughness and good corrosion resistance over a wide temperature range. An outstanding characteristic of Monel screws is that they offer exceptional resistance to hydrofluoric acid, a particularly tough acid to deal with, in all concentrations up to the boiling point. For hydrofluoric acid applications Monel flat head screws are perhaps the most resistant of all commonly used specialty alloys.
Monel alloy 400 & K500 screws also exhibit excellent corrosion resistance in marine applications and have reasonable corrosion resistance to sulfuric and hydrochloric acids under reducing conditions.
Because of these characteristics, Monel flat head screws are often found in marine and chemical processing applications.
A Ni-Cu alloy with high strength and good corrosion resistance
· Excellent resistance to hydrofluoric acid
· Excellent resistance to sea water for marine applications
· High strength metal with good toughness at high temperatures
· In-depth information on grades 400 and K500
· Datasheets available for Monel 400 and Monel K500
· Monel flat head screw features and benefits
The most common grades of Monel nickel alloy screws are Monel 400 and Monel K500 . Gain more insight on these two grades by accessing our Monel 400 and K500 overviews or by contacting our engineering experts.
Resources: Monel Torque Spec, Flange Dimensions, Flange Bolting Chart, Monel 400, Monel K500
Screw Types: 12 Point Screws, Button Head Cap Screws, Flat Head Screws, Hex Cap Screws, Pan Head Screws, Set Screws, Socket Head Cap Screws, Tamper Resistant Security Screws, Torx Screws
Monel Flat Head Screw Features and Benefits
Monel flat head screws are characterized by having a head with a top flat surface (which can feature either a slotted, phillips or allen driver) and bottom that is cone shaped or countersunk. With this design, the head of the screw can align flush or below the surrounding surface having obvious benefits.
Monel Slotted vs. Phillips Driver
Slotted Head Advantages | Phillips Head Advantages |
· Slotted head screws tend to strip less than Philips, especially in harsh environments · Slotted heads are typically better in applications where it's going to be unscrewed and re-done periodically, as the head tends to wear less. · In dirty environments, a flat head is much easier to clean out | · Phillips head offers a much stronger joint since it can tolerate more torque. |
Countersink Angle
For most flat head screw designs the angle of countersink is usually 82° for UNC and UNF applications however other angles ranging from 60° -120° could be specified.
Thread Type | Normal Flat Head Countersink Angle |
UNC / UNF | 82° |
Aerospace | 100° |
ISO Metric / Imperial | 90° |
Common Grades of Monel Screws
Monel 400
Monel 400, UNS N04400 (QQ-N-281), is a nickel-copper alloy with high strength and excellent corrosion resistance in a range of media including sea water, hydrofluoric acid, sulfuric acid, and alkalies. Monel 400 is commonly in marine engineering, chemical and hydrocarbon processing applications.
Monel 400 Specifications: BS3075NA13 (Wire), BS3076NA13 (Bar), ASTM B 164 (Rod, Bar, and Wire), ASTM B 564 (Forgings), ASME SB 164 (Rod, Bar, and Wire), ASME SB 564 (Forgings), AECMA PrEN 2305 (Wire for Rivets), SAE AMS 4675 (Bars and Forgings), SAE AMS 4730 (Wire), SAE AMS 4731 (Wire and Ribbon), DIN 17752 (Rod and Bar), DIN 17753 (Wire), DIN 17754 (Forgings), VdTÜV 263 (Sheet, Plate, Bar, and Tubing), QQ-N-281 (Plate, Sheet, Strip, Bar, Rod, Wire, and Forgings), Werkstoff 2.4360, ASTM F467 (Nuts), ASTM F468 (Bolts, Screws, Studs)
Monel 400 | Ni+Co | Cu | Fe | Mn | Si | C | S |
Min % | 63 | 28.0 | - | - | - | - | - |
Max % | - | 34.00 | 2.50 | 2.00 | 0.50 | 0.30 | 0.024 |
Monel K500
Monel K500, UNS N05500 (QQ-N-286), is a precipitation-hardenable nickel-copper alloy that combines the corrosion resistance of Monel alloy 400 with greater strength (over 2x as strong) and hardness. It also has low permeability and is nonmagnetic to temperatures as low as -150°F (-101°C).
Monel K500 Specifications: BS3075NA18 (Wire), BS3076NA18 (Rod and Bar), ASTM B 865 (Rod and Bar), DIN 17752 (Rod and Bar), DIN 17753 (Wire), DIN 17754 (Forgings), QQ-N-286 (Rod, Bar, Wire, and Forgings), SAE AMS 4676 (Rod and Bar), ASME Code Case 1192 (Rod and Bar), ISO 9723 (Bar), ISO 9724 (Wire), ISO 9725 (Forgings), Werkstoff 2.4375, ASTM F467 (Nuts), ASTM F468 (Bolts, Screws, Studs)
Monel K500 | Ni+Co | Cu | Fe | Mn | Si | C | S | Al | Ti |
Min % | 63 | 27.0 | - | - | - | - | - | 2.30 | 0.35 |
Max % | - | 33.00 | 2.00 | 1.50 | 0.50 | 0.25 | 0.010 | 3.15 | 0.85 |
MONEL 400 - Tensile Data
Temperature (°F) | Ultimate Tensile (ksi) | Yield Strength at 0.2% Offset (ksi) | Elongation % |
Room Temp. | 83 | 32 | 45 |
200 | 79 | 30 | 43 |
400 | 77 | 27 | 42 |
600 | 80 | 27 | 46 |
800 | 68 | 26 | 48 |
1000 | 54 | 24 | 40 |
MONEL K500 - Tensile Data
Temperature (°F) | Ultimate Tensile (ksi) | Yield Strength at 0.2% Offset (ksi) | Elongation % |
Room Temp. | 160 | 110 | 45 |
200 | 150 | 108 | 47 |
400 | 147 | 105 | 48 |
600 | 142 | 103 | 49 |
800 | 125 | 102 | 19 |
1000 | 95 | 90 | 8 |
PRESSURE - TEMPERATURE RATINGS FOR MONEL 400
Nominal Designation | Forgings | Castings | Plates |
67Ni 30Cu |
| B564Gr. N04400(1) | ... |
| B127Gr. N04400(1) |
Working Pressures by Classes psig |
Temp F | 150 | 300 | 400 | 600 | 900 | 1500 | 2500 |
20 to 100 | 230 | 600 | 800 | 1200 | 1800 | 3000 | 5000 |
200 | 200 | 525 | 700 | 1050 | 1575 | 2630 | 4380 |
300 | 190 | 490 | 655 | 980 | 1470 | 2450 | 4080 |
400 | 180 | 475 | 530 | 945 | 1420 | 2365 | 3340 |
500 | 170 | 475 | 630 | 945 | 1420 | 2365 | 3940 |
600 | 140 | 475 | 630 | 945 | 1420 | 2365 | 3340 |
650 | 125 | 475 | 630 | 945 | 1420 | 2365 | 3940 |
700 | 110 | 470 | 525 | 940 | 1410 | 2350 | 3920 |
750 | 95 | 465 | 620 | 930 | 1395 | 2330 | 3880 |
800 | 80 | 460 | 610 | 915 | 1375 | 2290 | 3820 |
850 | 65 | 375 | 505 | 755 | 1130 | 1885 | 3145 |
900 | 50 | 275 | 365 | 550 | 825 | 1370 | 2285 |