Chrome Moly Alloy Steel Bolting Specification
FERROBEND offers ASTM A453 Grade 660 Hex Cap Screws in Class A, B, C & D, manufactured to DIN 933, ISO 4017, ASME B18.2.1, B18.2.3.5M & UNI 5737 standards, in metric and inch sizes with UNC, UN, UNF, UNEF, ISO, BSW & BSF threads. Grade 660 hex cap screws are available with full thread; part threads and custom thread design.
| Metric Sizes | M6 to M152 |
| Inch Sizes | ΒΌ" to 8" |
| Metric Threads | ISO, ASME |
| Imperial Threads | ASME, BSW, BSF |
| Thread Standards | ISO 68-1, ISO 268, ISO 724, ASME B1.1, ASME B1.13M, BS 84, BS 3643 |
| DIN | ISO | ASME | UNI | |
| Imperial | Metric | |||
| 933 | 4017 | B18.2.1 | B18.2.3.1M | 5739 |
A reliable enquiry defines the finished component, not only the material grade. State the governing dimensional standard, nominal diameter, thread form and pitch, length convention, quantity, surface finish and required delivery condition. Include a drawing when a standard leaves more than one configuration open or when ends, points, drilled features, reduced shanks or non-standard thread lengths are involved.
Confirm the specified B7 material grade, the design temperature and pressure context, and any project material specification. Identify the compatible nut and washer grades. If sour, low-temperature or other special service applies, the responsible engineer should approve the material and supplementary requirements.
Name the dimensional standard and revision, thread class or tolerance, and whether dimensions are checked before or after coating. A coating can affect thread fit and friction, so specify the complete coating system, lubricant condition and mating parts together.
State the certificate type, heat and manufacturing-lot traceability, marking, mechanical tests, chemical analysis and any dimensional or nondestructive examination reports. Additional testing must be invoked before production with its method, sampling and acceptance criteria.
For related decisions, review the material specification, mechanical properties, coating guide, thread guide and testing and certification guide. Technical values should always be verified against the current governing standard and approved project documents.
