ASME B18.2.2 UNC
Dimensions of the specified commercial selection do not replace a manufacturing drawing or the complete supply specification.
ASME B18.2.2 UNC
UNC full hexagon nut
An inch series: nominal diameter and threads per inch must match the mating bolt.
- Dimensional range
- 1/4–7/8 in
- Thread
- UNC · TPI
- Configuration
- UNC full hexagon nut
Technical drawing and dimensional range
Selection from 1/4 to 7/8 inch. Other sizes and threads on request. UNC and UNF are distinct, non-interchangeable series.
Dimensions in inches. Identification drawing, not a manufacturing drawing.
| Thread (in) | TPI | sMin | sMax | mMin | mMax |
|---|---|---|---|---|---|
| 1/4 | 20 | 0.428 | 0.438 | 0.212 | 0.226 |
| 5/16 | 18 | 0.489 | 0.5 | 0.258 | 0.273 |
| 3/8 | 16 | 0.551 | 0.563 | 0.32 | 0.337 |
| 7/16 | 14 | 0.675 | 0.688 | 0.365 | 0.385 |
| 1/2 | 13 | 0.736 | 0.75 | 0.427 | 0.445 |
| 9/16 | 12 | 0.861 | 0.875 | 0.473 | 0.496 |
| 5/8 | 11 | 0.922 | 0.938 | 0.535 | 0.559 |
| 3/4 | 10 | 1.088 | 1.125 | 0.617 | 0.665 |
| 7/8 | 9 | 1.269 | 1.312 | 0.724 | 0.776 |
ASME B18.2.2 identifies geometry. Agree ASTM/SAE specification, grade, thread tolerance and finish for the supply. No automatic equivalence to metric classes 8, 10 or 12.
Materials and property classes
| Material | Class / hardness | Configurable range | Supply |
|---|---|---|---|
| Steel to mechanical specification | To be specified | 1/4-20 UNC, 5/16-18 UNC, 3/8-16 UNC, 7/16-14 UNC, 1/2-13 UNC, 9/16-12 UNC, 5/8-11 UNC, 3/4-10 UNC, 7/8-9 UNC | On request |
Other materials and specifications on request
For requirements beyond the tabulated combinations, enquire about aluminium, brass, nylon, duplex, superduplex or an ASTM specification. Alloy or grade, dimensions, mechanical requirements and finish are defined for the enquiry; the geometric reference does not automatically imply conformity with the product standard.
Enquire about another material or ASTM specification
Finishes and treatments
| Finish | Material | Class / hardness | M |
|---|---|---|---|
| Plain / as manufactured | Steel to mechanical specification | To be specified | 1/4-20 UNC, 5/16-18 UNC, 3/8-16 UNC, 7/16-14 UNC, 1/2-13 UNC, 9/16-12 UNC, 5/8-11 UNC, 3/4-10 UNC, 7/8-9 UNC |
Select the finish for the material/property-class combination. Hydrogen relief and lubrication are separate process requirements, not certificates and not implied by the coating name.
ISO, DIN and UNI: key differences
Documentation
Download Dueemme data sheet ↓| Document | Status |
|---|---|
| Declaration of conformity | Subject to order agreement |
| Material certificate | Subject to order agreement |
| EN 10204 2.2 test report | Subject to order agreement |
| EN 10204 3.1 inspection certificate | Subject to order agreement |
| Dimensional inspection report | Subject to order agreement |
| Coating report | Subject to order agreement |
| Other documentation | Subject to order agreement |
Batch documents are not automatically included: specify your requirements in the RFQ.
Mating components
Match nominal diameter, pitch, strength, material, finish and joint conditions.
ASME B18.2.2 identifies geometry. Agree ASTM/SAE specification, grade, thread tolerance and finish for the supply. No automatic equivalence to metric classes 8, 10 or 12.
Application sectors
The size you need, including custom specifications
Other diameters, lengths, materials and finishes can be assessed on request. For dedicated production, we agree geometry, requirements and minimum quantities with the customer.
Send your specification →Configure your enquiry
Selections follow the technical combinations in this data sheet. Quantities, delivery terms and documents will be agreed in the quotation.