This page presents the complete ASME B18.3 dimensional standard as used by Ananka Fasteners Pvt Ltd across our fastener catalogue. Governs the dimensions of socket-head cap, shoulder, button-head, flat-head and set screws with internal hex drive, in imperial sizes #0 through 4 inch. The dimension table below reflects the values manufactured to at Ananka in every grade we stock.
Governs the dimensions of socket-head cap, shoulder, button-head, flat-head and set screws with internal hex drive, in imperial sizes #0 through 4 inch.
| Standard | ASME B18.3 | Family | ASME |
| Units | Inch | Nominal Size Range | #0 – 4 in |
| Thread Standard | ASME B1.1 UNC / UNF | Fastener Types Covered at Ananka | Socket Head Cap Screw |
| Grades Available | 79 (Nickel 200 through Zeron 100 – see Section 4) | Related Standards | ISO 4762 |
The ASME B18.3 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads. ASME B18.3 governs socket head cap screws driven by an internal hex (Allen) key.
| Nominal Size | Head Diameter (Max, in) | Head Height (Max, in) | Hex Socket Size (in) | Thread |
|---|---|---|---|---|
| #10 (0.190″) | 0.312 | 0.190 | 5/32 | 10-24 UNC |
| 1/4″ | 0.375 | 0.250 | 3/16 | 1/4-20 UNC |
| 5/16″ | 0.469 | 0.312 | 1/4 | 5/16-18 UNC |
| 3/8″ | 0.562 | 0.375 | 5/16 | 3/8-16 UNC |
| 1/2″ | 0.750 | 0.500 | 3/8 | 1/2-13 UNC |
| 5/8″ | 0.938 | 0.625 | 1/2 | 5/8-11 UNC |
| 3/4″ | 1.125 | 0.750 | 5/8 | 3/4-10 UNC |
| 1″ | 1.500 | 1.000 | 3/4 | 1-8 UNC |
At Ananka, the following fastener geometries are produced to ASME B18.3:
Every grade in the Ananka catalogue is available in this dimensional standard:
Threads are cut to ASME B1.1 UNC / UNF. Standard tolerance class is 6g (external) / 6H (internal) for metric, or Class 2A/3A for inch series. Fine-thread and interference-fit variants are available on request.
Every fastener produced to ASME B18.3 undergoes 100% dimensional inspection with calibrated gauges. Traceability is maintained from mill certificate to shipment.
For technical documentation and quotations, buyers can also review the Ananka Fasteners manufacturing and supply range or contact the team through the fastener enquiry and technical support page.
This datasheet references ASME B18.3 for dimensional requirements. The applicable standard edition and purchase requirements should be confirmed for every project.
For ASME standards information, see the ASME standards catalogue. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
Governs the dimensions of socket-head cap, shoulder, button-head, flat-head and set screws with internal hex drive, in imperial sizes #0 through 4 inch.
ASME B18.3 is manufactured by Ananka in Socket Head Cap Screw, across a #0 – 4 in size range.
Ananka Fasteners manufactures Socket Head Cap Screw to ASME B18.3. See the Fastener Types table above for the full list.
Threads are cut to ASME B1.1 UNC / UNF. See Section 5 above for the tolerance class.
79 (Nickel 200 through Zeron 100 – see Section 4) available in this dimensional standard. See Section 4 above for the full grade list.
Yes. For a quotation, provide the required nominal size, material grade, quantity and any inspection or certificate requirements.
Need a fastener manufactured to ASME B18.3 for an industrial project? Send the required fastener type, size, material grade, quantity and certification requirements to Ananka Fasteners. Our team can review the requirement and provide technical and commercial information for standard or custom configurations.
Recommended RFQ details: ASME B18.3 requirement, fastener type, nominal size, material grade, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
