ASME B 18.3 Hexagon Socket Head Cap Screws Cylindrical Socket Head Cap Screw UNC UNF Gr2 5 8 Black YZP Used In Machine
Specification
Alloy Steel Socket Head Screws
With a tensile strength of 170,000 psi, these alloy steel screws are stronger than Grade 8 steel screws. Length is measured from under the head.
Black-oxide steel screws are mildly corrosion resistant in dry environments. Zinc-plated steel screws resist corrosion in wet environments. Zinc-aluminum-coated steel screws are 40 times as corrosion resistant as zinc-plated screws and comparable to Magni-coated screws. They withstand 1,000 hours of salt spray per ASTM B117.
Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance. They are not compatible with coarse threads.
Screws that meet ASTM A574, ASTM A574M, and ISO 898-1 comply with specifications and testing requirements for material quality. Screws that meet ASME B18.3, ASME B18.3M, ISO 21269, and ISO 4762 (formerly DIN 912) comply with specifications for dimensional standards.
| Size | |
| d | Screw Diameter | | PP | UNC | | UNF | | UNEF | | ds | max=nominal size | | min | | dk | max | | min | | k | max | | min | | s | Nominal Size | | t | min | | b | min | | | 0.060 | 0.073 | 0.086 | 0.099 | 0.112 | 0.125 | 0.138 | 0.164 | 0.190 | 0.250 | 0.3125 | 0.375 | 0.4375 | 0.500 | 0.625 | 0.750 | | - | 64.0 | 56.0 | 48.0 | 40.0 | 40.0 | 32.0 | 32.0 | 24.0 | 20.0 | 18.0 | 16.0 | 14.0 | 13.0 | 11.0 | 10.0 | | 80.0 | 72.0 | 64.0 | 56.0 | 48.0 | 44.0 | 40.0 | 36.0 | 32.0 | 28.0 | 24.0 | 24.0 | 20.0 | 20.0 | 18.0 | 16.0 | | - | - | - | - | - | - | - | - | - | 32.0 | 32.0 | 32.0 | 28.0 | 28.0 | 24.0 | 20.0 | | 0.060 | 0.073 | 0.086 | 0.099 | 0.112 | 0.125 | 0.138 | 0.164 | 0.190 | 0.250 | 0.3125 | 0.375 | 0.4375 | 0.500 | 0.625 | 0.750 | | 0.0568 | 0.0695 | 0.0822 | 0.0949 | 0.1075 | 0.1202 | 0.1329 | 0.1585 | 0.1840 | 0.2435 | 0.3053 | 0.3678 | 0.4294 | 0.4919 | 0.6163 | 0.7406 | | 0.096 | 0.118 | 0.140 | 0.161 | 0.183 | 0.205 | 0.226 | 0.270 | 0.312 | 0.375 | 0.469 | 0.562 | 0.656 | 0.750 | 0.938 | 1.125 | | 0.091 | 0.112 | 0.134 | 0.154 | 0.176 | 0.198 | 0.218 | 0.262 | 0.303 | 0.365 | 0.457 | 0.550 | 0.642 | 0.735 | 0.921 | 1.107 | | 0.060 | 0.073 | 0.086 | 0.099 | 0.112 | 0.125 | 0.138 | 0.164 | 0.190 | 0.250 | 0.312 | 0.375 | 0.438 | 0.500 | 0.625 | 0.750 | | 0.057 | 0.070 | 0.083 | 0.095 | 0.108 | 0.121 | 0.134 | 0.159 | 0.185 | 0.244 | 0.306 | 0.368 | 0.430 | 0.492 | 0.616 | 0.740 | | 0.050 | 0.062 | 0.078 | 0.078 | 0.094 | 0.094 | 0.109 | 0.141 | 0.156 | 0.188 | 0.250 | 0.312 | 0.375 | 0.375 | 0.500 | 0.625 | | 0.025 | 0.031 | 0.038 | 0.044 | 0.051 | 0.057 | 0.064 | 0.077 | 0.090 | 0.120 | 0.151 | 0.182 | 0.213 | 0.245 | 0.307 | 0.370 | | 0.50 | 0.62 | 0.62 | 0.62 | 0.75 | 0.75 | 0.75 | 0.88 | 0.88 | 1.00 | 1.12 | 1.25 | 1.38 | 1.50 | 1.75 | 2.00 | |
| Size | |
| d | Screw Diameter | | PP | UNC | | UNF | | UNEF | | ds | max=nominal size | | min | | dk | max | | min | | k | max | | min | | s | Nominal Size | | t | min | | b | min | | | 0.875 | 1.000 | 1.125 | 1.250 | 1.375 | 1.500 | 1.750 | 2.000 | 2.250 | 2.500 | 2.750 | 3.000 | 3.250 | 3.500 | 3.750 | 4.000 | | 9.0 | 8.0 | 7.0 | 7.0 | 6.0 | 6.0 | 5.0 | 4.5 | 4.5 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | | 14.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | - | - | - | - | - | - | - | - | - | - | | 20.0 | 20.0 | 18.0 | 18.0 | 18.0 | 18.0 | - | - | - | - | - | - | - | - | - | - | | 0.875 | 1.000 | 1.125 | 1.250 | 1.375 | 1.500 | 1.750 | 2.000 | 2.250 | 2.500 | 2.750 | 3.000 | 3.250 | 3.500 | 3.750 | 4.000 | | 0.8647 | 0.9886 | 1.1086 | 1.2336 | 1.3568 | 1.4818 | 1.7295 | 1.9780 | 2.2280 | 2.4762 | 2.7262 | 2.9762 | 3.2262 | 3.4762 | 3.7262 | 3.9762 | | 1.312 | 1.500 | 1.688 | 1.875 | 2.062 | 2.250 | 2.625 | 3.000 | 3.375 | 3.750 | 4.125 | 4.500 | 4.875 | 5.250 | 5.625 | 6.000 | | 1.293 | 1.479 | 1.665 | 1.852 | 2.038 | 2.224 | 2.597 | 2.970 | 3.344 | 3.717 | 4.090 | 4.464 | 4.837 | 5.211 | 5.584 | 5.958 | | 0.875 | 1.000 | 1.125 | 1.250 | 1.375 | 1.500 | 1.750 | 2.000 | 2.250 | 2.500 | 2.750 | 3.000 | 3.250 | 3.500 | 3.750 | 4.000 | | 0.864 | 0.988 | 1.111 | 1.236 | 1.360 | 1.485 | 1.734 | 1.983 | 2.232 | 2.481 | 2.730 | 2.979 | 3.228 | 3.478 | 3.727 | 3.976 | | 0.750 | 0.750 | 0.875 | 0.875 | 1.000 | 1.000 | 1.250 | 1.500 | 1.750 | 1.750 | 2.000 | 2.250 | 2.250 | 2.750 | 2.750 | 3.000 | | 0.432 | 0.495 | 0.557 | 0.620 | 0.682 | 0.745 | 0.870 | 0.995 | 1.120 | 1.245 | 1.370 | 1.495 | 1.620 | 1.745 | 1.870 | 1.995 | | 2.25 | 2.50 | 2.81 | 3.12 | 3.44 | 3.75 | 4.38 | 5.00 | 5.62 | 6.25 | 6.88 | 7.50 | 8.12 | 8.75 | 9.38 | 10.00 | |
Mechanical property :SAEJ429
Process flow
Cold forging
Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ thread rolling ➨make heat treatment(if need) ➨ Finish ➨ Packing
Hot forging
Cutting material ➨ hot forging ➨ turning ➨ shrink diameter(half thread) ➨thread rolling ➨ make heat treatment(if need) ➨ Finish ➨ Packing
Product Grade
Grade2 Grade5 Grade8
Materials and Chemical compstition
1008
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu | Al |
| 0.06 | 0.06 | 0.33 | 0.013 | 0.003 | 0.01 | 0 | 0.01 | 0.028 |
1035
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.34 | 0.13 | 0.73 | 0.012 | 0.002 | 0.02 | 0.01 | 0.02 |
10B21
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | B |
| 0.2 | 0.04 | 0.81 | 0.017 | 0.007 | 0.017 | 0.0021 |
1045
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.45 | 0.23 | 0.58 | 0.014 | 0.006 | 0.057 | 0.008 | 0.016 |
40CR
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.4 | 0.21 | 0.54 | 0.015 | 0.008 | 0.95 | 0.02 | 0.02 |
35CRMO
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
| 0.35 | 0.22 | 0.59 | 0.01 | 0.003 | 0.93 | 0.01 | 0.01 | 0.21 |
42CRMO
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
| 0.42 | 0.27 | 0.92 | 0.013 | 0.004 | 1.01 | 0.03 | 0.04 | 0.2 |
Finish
PLAIN ZP YZP BLACK HDG DACROMET GEOMET CHROME NICKEL AND SO ON
PACKING
QBH BULK
20-25KG/CTN,36CTNS/PALLET
20-30KG/BAGS,36BAGS/PALLET
ONE TON/BOXES
50KG/ IRON DRUM,12 IRON DRUMS/PALLET
QBH SMALL PACKING
Packing in small boxes according to customer’s requirements
Packing in plastic bag according to customer’s requirements
QBH PALLET TYPE
SOLID WOOD FUMIGATION PALLET
EURO Pallet
THREE SPLINT PALLET
WOODEN BOX
The advantages of QBH
- QBH brand sales to the main quality assurance.
- Years of export trade management, excellent service, word-of-mouth guarantee.
- By working with TUV,escort for quality.
- Customization of non-standard parts can be made according to customer's requirements and drawings.
- For quality customers,we can provide a certain credit period.
Product application
QBH Hex Socket head cap screws are commonly used in machine assembly for removable panels and parts. They have a round cap with a hex head and are tightened with a socket wrench drive. Longer caps are easier to see when fastened, while button and flat head caps are less likely to snag clothing or linkages. Cap screws with a black oxide or armor coat finish resist corrosion.
