GB/T 5783 is the standard cited for cylinder connecting sleeve. This page sets out what the standard controls for this part, reproduces the dimensional table supplied against it, and notes the related designations referenced on drawings.
GB/T 5783 — Scope
GB/T 5783 is "Fasteners — Hexagon head screws — Product grades A and B". GB/T 5783 is the Chinese national adoption of the same document. It covers M1.6 to M64. Threaded to the head. The partly threaded equivalent is ISO 4014.
Material, property class, surface finish and packaging are governed by separate documents — ISO 898-1 and ISO 898-2 for mechanical property classes, ISO 4042 for electroplated finishes.
Tolerance & Product Grades
GB/T 5783 defines product grades A and B. The grade sets how closely the finished part has to follow the nominal dimensions; it is not a strength rating.
Dimensions Specified by GB/T 5783
| Size designation | Outer diameter / width (mm) | Length / height (mm) | Bore / thread (mm) | Material | Reference standard |
|---|---|---|---|---|---|
| Size 1 | 10 | 20 | 6 | C45 carbon steel | GB/T 1804-m |
| Size 2 | 12 | 25 | 8 | C45 carbon steel | GB/T 1804-m |
| Size 3 | 16 | 32 | 10 | C45 carbon steel | GB/T 1804-m |
| Size 4 | 20 | 40 | 12 | C45 carbon steel | GB/T 1804-m |
| Size 5 | 25 | 50 | 16 | C45 carbon steel | GB/T 1804-m |
| Size 6 | 32 | 63 | 20 | C45 carbon steel | GB/T 1804-m |
| Size 7 | 40 | 80 | 25 | C45 carbon steel | GB/T 1804-m |
| Size 8 | 50 | 100 | 30 | C45 carbon steel | GB/T 1804-m |
Companion Standards
GB/T 5783 controls only the geometry of cylinder connecting sleeve — gb/t 5783 / iso 4017 (series 013). The mechanical strength is set by ISO 898-1 (bolts, screws and studs) or ISO 898-2 (nuts); the surface finish is governed by separate finish standards such as ISO 4042 for electroplating. For corrosion testing, the relevant document is ISO 9227 (neutral salt spray).
When to Specify GB/T 5783
Choose GB/T 5783 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for cylinder connecting sleeve — gb/t 5783 / iso 4017 (series 013).
Custom manufacturing · Made to drawing
Need a machined component to this standard in a non-standard size?
Parts built to GB T 5783 are already in the catalog, so a special is usually a variation on existing tooling rather than a new design — which is what keeps the cost down. Made by warm forging or thread turning.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
