GB/T 852
GB/T 852 square taper washers for I-sections in M6–M36. State the nominal size, material, finish, quantity and packaging requirements in the RFQ.
GB/T 852Product specifications
Review the standard, structure, nominal range and ordering fields for this product family.
Specification table
Search, copy or scroll through the dimensional rows, then confirm the edition and order requirements in the RFQ.
Technical Drawing
Read these symbols alongside the dimension table below. Confirm the standard edition and order drawing for the selected size.
View full-size drawing ↗Download drawing ↓| Nominal size | d max | d min | s | h | h1 | Mass/1,000≈kg | Preference |
|---|---|---|---|---|---|---|---|
| M6 | 6.96 | 6.6 | 16 | 2 | 4.7 | 5.8 | Preferred |
| M8 | 9.36 | 9 | 18 | 2 | 5 | 7.11 | Preferred |
| M10 | 11.43 | 11 | 22 | 2 | 5.7 | 11.69 | Preferred |
| M12 | 13.93 | 13.5 | 28 | 2 | 6.7 | 21.76 | Preferred |
| M16 | 17.93 | 17.5 | 35 | 2 | 7.8* | 37.6 | Preferred |
| M18 | 20.52 | 20 | 40 | 3 | 9.7 | 63.73 | Non-preferred |
| M20 | 22.52 | 22 | 40 | 3 | 9.7 | 60.47 | Preferred |
| M22 | 24.52 | 24 | 40 | 3 | 9.7 | 56.9 | Non-preferred |
| M24 | 26.52 | 26 | 50 | 3 | 11.3 | 109.8 | Preferred |
| M27 | 30.52 | 30 | 50 | 3 | 11.3 | 99.91 | Non-preferred |
| M30 | 33.62 | 33 | 60 | 3 | 13 | 171.3 | Preferred |
| M36 | 39.62 | 39 | 70 | 3 | 14.7 | 255.9 | Preferred |
* M16: Public references list h1 as 7.7 mm and 7.8 mm. Confirm the adopted value in the standard text or an agreed technical document before ordering.
Dimension fields are organised to GB/T 852-1988. State the standard edition, nominal size and delivery requirements in the RFQ.
Surface Finishes
Choose the finish to suit your application.
Explore how each finish is made and what it offers.Black oxide is a chemical conversion process that forms a black oxide film on iron or steel. It retains the underlying metal texture and is commonly followed by oiling, waxing or sealing.
The thin conversion film has little effect on dimensions and suits mechanical parts requiring a dark finish. Corrosion protection depends largely on the subsequent oil or sealant layer.
Yellow zinc uses coloured passivation over an electroplated zinc layer, producing yellow, gold or iridescent tones. Zinc remains the underlying protective layer; the passivation film creates the surface colour.
It combines a distinctive metallic appearance with corrosion protection. Colour intensity does not indicate a corrosion-resistance grade; performance depends on the complete coating and post-treatment system.
Mechanical zinc plating tumbles parts with zinc powder, glass beads and process chemicals in a barrel. The beads repeatedly impact the surface, building a mechanically bonded zinc coating with a typically matt grey appearance.
Deposition does not use an electric current and is suited to small parts such as washers and fasteners. Coverage depends on geometry and access for the beads, so deep holes and recesses can be difficult to coat evenly.
Zinc-nickel plating co-deposits zinc and nickel onto a part by electroplating, followed by passivation or sealing. It can have a silver-grey appearance or other colours depending on the post-treatment.
The alloy deposit, passivation and sealer work together to provide corrosion protection for automotive and industrial fasteners. Performance depends on alloy composition, coating thickness and post-treatment.
Blue-white zinc combines an electroplated zinc layer with blue or clear passivation. The resulting surface is typically silver-white with a slight blue tint, a familiar finish on washers and other fasteners.
Zinc provides sacrificial protection for the steel, while passivation slows corrosion of the zinc layer. The finish is relatively bright; corrosion performance depends on coating thickness, passivation and sealing.
Hot-dip galvanizing immerses cleaned iron or steel parts in molten zinc. Zinc reacts with the steel to form zinc-iron alloy layers beneath an outer zinc layer, typically giving a silver-grey appearance.
The generally substantial coating protects steel through both a physical barrier and sacrificial zinc action. It is widely used for outdoor and structural components, with coating build-up affecting holes and assembly clearances.
Dacromet is a non-electrolytic zinc-aluminium flake coating. A coating containing zinc and aluminium flakes is applied by dipping, dip-spin or spraying, then heat-cured to form a silver-grey protective layer.
Overlapping flakes create a barrier, supported by sacrificial zinc protection. Commonly used on fasteners, its performance varies with the formulation, topcoat and curing conditions.
Teflon coatings use fluoropolymer formulations, including PTFE-based systems. Application and curing create a functional film on the part, with colours such as blue or black depending on the formulation.
Key properties include low friction, nonstick behaviour and chemical resistance, supporting sliding and release applications. Temperature capability, wear resistance and protective performance vary by coating system.
DIN / ISO Cross-reference
GB/T 852-1988 and current DIN 435:2024-10 cover similar I-section applications but are not direct equivalents. No direct ISO counterpart was identified; engineering substitution requires a point-by-point comparison of taper, dimensions, material and joint design.
Public DIN catalogue records list DIN 435:2024-10 for square taper washers used with I-sections. It is not a confirmed equivalent adoption of GB/T 852-1988; taper, side width, thickness, hole diameter, material and strength requirements must be compared point by point.
ReferenceChina National Standards Open System: GB/T 852-1988GB/T 852-1988 does not indicate ISO adoption. Compare taper, dimensions, material and joint design when considering a similar international standard.
ReferenceChina National Standards Open System: GB/T 852-1988Technical reading
Current status, M6–M36 range, dimensional fields and purchasing requirements for GB/T 852-1988.
How application, geometry and dimensional fields distinguish the two square taper washer standards.
FAQ
GB/T 852 Square Taper Washer for I-Sections is a RINGRHINO product family. This page provides the applicable standard, product structure, nominal range and ordering information.
GB/T 852-1988 and current DIN 435:2024-10 cover similar I-section applications but are not direct equivalents. No direct ISO counterpart was identified; engineering substitution requires a point-by-point comparison of taper, dimensions, material and joint design.
State the standard and edition, hardness or material state, nominal size, material, finish, quantity, packaging and document requirements.
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