Jiaxing City Qunbang Hardware Co., Ltd
Company Culture: Unrestrained, Vivid, Competed, Opened Service Concept: Hand-in-hand Commitment, Heart-to-heart service.
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Specification
Also known as jam nuts, these are about half the height of standard hex nuts. Use them in low-clearance applications or jam one against another nut to hold it in place. About half the strength of medium-strength steel thin nuts, use them for light duty fastening applications, such as securing access panels.
Zinc-plated steel nuts resist corrosion in wet environments.
Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments.
| Nominal Size | F | C | H | TYPE | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Width Across Flats | Width Across Corners | Thickness | ||||||||
| Basic | Max | Min | Max | Min | Basic | Max | Min | Plain | Galvanized | |
| 1⁄2 | 3⁄4 | 0.750 | 0.736 | 0.866 | 0.840 | 5⁄16 | 0.323 | 0.302 | JAM NUT | JAM NUT |
| 5⁄8 | 15⁄16 | 0.938 | 0.922 | 1.083 | 1.051 | 3⁄8 | 0.387 | 0.363 | JAM NUT | JAM NUT |
| 3⁄4 | 11⁄8 | 1.125 | 1.088 | 1.299 | 1.240 | 27⁄64 | 0.446 | 0.398 | JAM NUT | JAM NUT |
| 7⁄8 | 15⁄16 | 1.312 | 1.269 | 1.516 | 1.447 | 31⁄64 | 0.510 | 0.458 | JAM NUT | JAM NUT |
| 1 | 11⁄2 | 1.500 | 1.450 | 1.732 | 1.653 | 35⁄64 | 0.575 | 0.519 | JAM NUT | JAM NUT |
| 11⁄8 | 111⁄16 | 1.688 | 1.631 | 1.949 | 1.859 | 39⁄64 | 0.639 | 0.579 | JAM NUT | JAM NUT |
| 11⁄4 | 17⁄8 | 1.875 | 1.812 | 2.165 | 2.066 | 23⁄32 | 0.751 | 0.687 | JAM NUT | JAM NUT |
| 13⁄8 | 21⁄16 | 2.062 | 1.994 | 2.382 | 2.273 | 25⁄32 | 0.815 | 0.747 | JAM NUT | JAM NUT |
| 11⁄2 | 21⁄4 | 2.250 | 2.175 | 2.598 | 2.480 | 27⁄32 | 0.880 | 0.808 | JAM NUT | JAM NUT |
| Dimensions per ASME B18.2.2 1987 (1999) | ||||||||||
Process flow
Cold forging
Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ tapping ➨make heat treatment(if need) ➨ Finish ➨ Packing
Hot forging
Cutting material ➨ hot forging ➨ turning ➨ tapping ➨ make heat treatment(if need) ➨ Finish ➨ Packing
Product Grade
Grade 2 Grade 5 Grade 8
Materials and Chemical compstition
| J995 Chemical Requirements | ||||
| Grade | Carbon, % | Phosphorus, % | Manganese, % | Sulfur, % |
| 2 | 0.47 max | 0.120 max | - | 0.15 max |
| 5 | 0.55 max | 0.050 max | 0.30 min | 0.15 max |
| 8 | 0.55 max | 0.040 max | 0.30 min | 0.05 max |
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
Mechanical property
| J995 Mechanical Properties | |||
| Grade | Nominal Size, inches | Proofload, UNC and UN 8 Threads, psi | Rockwell Hardness |
| 2 | 1/4 thru 1-1/2 | 90,000 | C32 Max |
| 5 | 1/4 thru 1 | 120,000 | C32 Max |
| Over 1 thru 1-1/2 | 105,000 | C32 Max | |
| 8 | 1/4 thru 5/8 | 150,000 | C24-C32 |
| Over 5/8 thru 1 | 150,000 | C26-C34 | |
| Over 1 thru 1-1/2 | 150,000 | C26-C36 | |
| *Values listed are not normally applicable to jam, slotted, castle, heavy or thick nuts. | |||
| J995 Tensile Stress Area | |||
| Thread, UNC | UNC Stress Area, sq inches | Thread, 8TPI | 8 TPI Stress Area, sq inches |
| 1/2-13 | 0.1419 | ||
| 5/8-11 | 0.226 | ||
| 3/4-10 | 0.334 | ||
| 7/8-9 | 0.462 | ||
| 1-8 | 0.606 | 1--8 | 0.606 |
| 1-1/8-7 | 0.763 | 1-1/8-8 | 0.79 |
| 1-1/4-7 | 0.969 | 1-1/4-8 | 1 |
| 1-3/8-7 | 1.155 | 1-3/8-8 | 1.233 |
| 1-1/2-6 | 1.405 | 1-1/2-8 | 1.492 |
| To calculate individual nut proofload value, simply multiply the tensile stress area by the appropriate psi proofload value. | |||
| Grade | 2 | 5 | 8 | ||||
| Size | 1/4 to 1-1/2 | 1/4 to 1 | 1/4 to 1 | 1 to 1-1/2 | 1 to 1-1/2 | 1/4 to 1-1/2 | 1/4 to 1-1/2 |
| Thread Series | UNC and 8NU | UNC and 8NU | UNF and 12UN or more fine thread | UNC and 8NU | UNF and 12UN or more fine thread | UNC and 8NU | UNF and 12UN or more fine thread |
| PROOF LOAD Unit:psi | |||||||
| HEX NUT | - | 120000 | 109000 | 105000 | 94000 | 150000 | 150000 |
| HEX FLANGE NUT | - | 120000 | 109000 | 105000 | 94000 | 150000 | 150000 |
| HEX JAM NUT | - | 72000 | 65000 | 63000 | 57000 | 90000 | 900000 |
| HEAVY HEX JAM NUT | - | 72000 | 65000 | 63000 | 57000 | 90000 | 900000 |
| HEX SLOTTED NUT | - | 96000 | 87000 | 84000 | 75000 | 120000 | 120000 |
| HEAVY HEX NUT | - | 133000 | 120000 | 116000 | 105000 | 165000 | 150000 |
| HEX THICK NUT | - | 133000 | 120000 | 116000 | 105000 | 165000 | 150000 |
| HEAVY HEX SLOTTED NUT | - | 105000 | 96000 | 92000 | 84000 | 132000 | 120000 |
| HEX THICK SLOOTED NUT | - | 105000 | 96000 | 92000 | 84000 | 132000 | 120000 |
| SQUARE NUT | 90000 | - | - | - | - | - | - |
The advantages of QBH
Product application
Hex jam nuts are thinner than a standard hex nut but have the same dimension across the flats and corners. Hex jam nuts have two common applications. A jam nut can be threaded onto a bolt and run tight against the standard nut which will lock the nut in place and prevent it from backing off. Jam nuts are sometimes used for leveling purposes as well.
Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized hex jam nuts are tapped oversize to compensate for the corrosion resistant coating on the bolts.