{"id":2824,"date":"2026-07-02T03:23:25","date_gmt":"2026-07-02T03:23:25","guid":{"rendered":"https:\/\/www.agricultural-parts.top\/application\/how-to-read-a-chinese-agricultural-parts-technical-drawing\/"},"modified":"2026-07-02T03:23:25","modified_gmt":"2026-07-02T03:23:25","slug":"how-to-read-a-chinese-agricultural-parts-technical-drawing","status":"publish","type":"post","link":"https:\/\/www.agricultural-parts.top\/my\/application\/how-to-read-a-chinese-agricultural-parts-technical-drawing\/","title":{"rendered":"\u1010\u101b\u102f\u1010\u103a \u1005\u102d\u102f\u1000\u103a\u1015\u103b\u102d\u102f\u1038\u101b\u1031\u1038 \u1021\u1005\u102d\u1010\u103a\u1021\u1015\u102d\u102f\u1004\u103a\u1038\u1019\u103b\u102c\u1038 \u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u1015\u102f\u1036\u1000\u103c\u1019\u103a\u1038\u1000\u102d\u102f \u1018\u101a\u103a\u101c\u102d\u102f\u1016\u1010\u103a\u101b\u1019\u101c\u1032"},"content":{"rendered":"
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\u1005\u102d\u102f\u1000\u103a\u1015\u103b\u102d\u102f\u1038\u101b\u1031\u1038\u1017\u101f\u102f\u101e\u102f\u1010<\/span>|<\/span>PRR \u1011\u103d\u1014\u103a\u1005\u1000\u103a \u1021\u1005\u102d\u1010\u103a\u1021\u1015\u102d\u102f\u1004\u103a\u1038 \u101c\u102e\u1019\u102d\u1010\u1000\u103a \u1019\u102d\u1010\u103a\u1016\u1000\u103a<\/span>|<\/span>\u1016\u1010\u103a\u101b\u1014\u103a \u1048 \u1019\u102d\u1014\u1005\u103a<\/span><\/div>\n

\u1010\u101b\u102f\u1010\u103a \u1005\u102d\u102f\u1000\u103a\u1015\u103b\u102d\u102f\u1038\u101b\u1031\u1038 \u1021\u1005\u102d\u1010\u103a\u1021\u1015\u102d\u102f\u1004\u103a\u1038\u1019\u103b\u102c\u1038 \u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u1015\u102f\u1036\u1000\u103c\u1019\u103a\u1038\u1000\u102d\u102f \u1018\u101a\u103a\u101c\u102d\u102f\u1016\u1010\u103a\u101b\u1019\u101c\u1032<\/h2>\n

Chinese agricultural parts technical drawings follow the GB\/T (Guobiao) national standard, which is based on the ISO drawing standard but differs from the ANSI\/ASME system used in North America and from the BS 308 system used in the United Kingdom. For agricultural equipment buyers sourcing parts directly from Chinese manufacturers, being able to read and verify a technical drawing is a critical skill \u2014 it allows you to confirm that the part you are being supplied matches the specification you need, catch dimensional errors before parts are manufactured, and communicate changes clearly without relying entirely on the supplier’s interpretation of your verbal description.<\/p>\n

This guide covers the key elements of Chinese agricultural parts drawings that commonly differ from Western drawing conventions, how to interpret the most important dimensions and tolerances, and what to verify before approving a drawing for production.<\/p>\n

\"how<\/p>\n
Chinese agricultural parts drawings follow GB\/T standards \u2014 understanding the key differences from Western conventions prevents costly interpretation errors in production.<\/div>\n<\/div>\n

First-Angle vs Third-Angle Projection<\/h2>\n

The most immediately confusing difference between Chinese and Western technical drawings is the projection method. Chinese drawings use first-angle projection<\/strong> (consistent with ISO and European practice), while North American drawings use third-angle projection. In first-angle projection, the front view is placed top-left, the top view is placed below the front view, and the right-side view is placed to the left of the front view \u2014 the opposite of the third-angle convention that places the right-side view to the right. A drawing symbol in the title block identifies the method: a truncated cone symbol with the small end facing right indicates first-angle; small end facing left indicates third-angle. Always check this symbol before reading dimensions from views.<\/p>\n

Dimension Tolerances and Surface Finish<\/h2>\n

Chinese drawings express dimensional tolerances following GB\/T 1800 \u2014 the fundamental tolerance standard aligned with ISO 286. Tolerances appear as letter-number codes: H7 for a hole, h6 for a shaft. The capital letter indicates a hole (internal feature) and the lowercase letter indicates a shaft (external feature). The number indicates the tolerance grade \u2014 lower numbers are tighter. Common fits in agricultural parts: H7\/h6<\/strong> is a close clearance fit used for gear bores and shaft shoulders; H8\/f7<\/strong> is a looser clearance fit for less critical locations. If you need to convert a tolerance code to an actual dimensional allowance, use the tolerance tables in GB\/T 1800.2 or the equivalent ISO 286-2 \u2014 both are available from Chinese standards bodies and international standards organisations.<\/p>\n

Surface finish is expressed as Ra (arithmetic mean roughness) in micrometres, written as the Ra value inside an inverted triangle symbol. Ra 3.2 \u03bcm is a machined finish; Ra 1.6 \u03bcm is a smoother finish typical of bearing bores; Ra 6.3 \u03bcm is an acceptable general machined surface. These values align with ISO and are directly comparable to Ra values on Western drawings.<\/p>\n

Material Designations and Grade Equivalents<\/h2>\n
\n\n\n\n\n\n\n\n\n\n
Chinese Grade (GB)<\/th>\nISO \/ EN Equivalent<\/th>\nAISI\/SAE Equivalent<\/th>\nCommon Use<\/th>\n<\/tr>\n<\/thead>\n
45 (steel)<\/td>\nC45 \/ 1.0503<\/td>\n1045<\/td>\nShafts, sprockets, gears<\/td>\n<\/tr>\n
\u1044\u1040 \u1001\u101b\u102d\u102f\u1000\u101b\u1000\u103a<\/td>\n41Cr4 \/ 1.7035<\/td>\n5140<\/td>\nHigh-strength shafts, gears<\/td>\n<\/tr>\n
20CrMnTi<\/td>\nApprox. 20MnCr5<\/td>\nApprox. 8620<\/td>\nCase-hardened gears<\/td>\n<\/tr>\n
Q235<\/td>\nS235JR \/ 1.0038<\/td>\nA36<\/td>\nStructural brackets, frames<\/td>\n<\/tr>\n
HT200 (grey iron)<\/td>\nEN-GJL-200<\/td>\nASTM A48 Class 30<\/td>\nHousings, covers<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Key Items to Verify Before Approving a Drawing<\/h2>\n

Before approving a Chinese supplier’s drawing for production, verify: the projection angle is identified and you are reading views in the correct orientation; all critical dimensions match your specification (bore diameter, key width, flange bolt pattern, overall length); tolerances on functional surfaces are specified and are achievable in the supplier’s process; material grade is specified on the drawing title block, not just discussed in email; heat treatment specification (carburising depth, hardness range) is noted on the drawing if applicable; and surface finish is specified on bearing surfaces and sealing surfaces. Request a first-article sample for dimensional verification against the drawing before committing to volume production.<\/p>\n

PRR Tractor Part Limited Partnership has extensive experience in sourcing agricultural parts directly from Chinese manufacturers. Browse our gearbox catalog<\/a> \u1014\u103e\u1004\u1037\u103a \u1002\u102e\u101a\u102c\u1000\u1010\u103a\u1010\u101c\u1031\u102c\u1000\u103a<\/a>, or contact sales@agricultural-parts.top for direct sourcing assistance.<\/p>\n

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Agricultural Parts Sourced Directly from Chinese Manufacturers<\/p>\n

PRR Tractor Part supplies agricultural transmission components \u2014 gearboxes, gears, sprockets, PTO shafts \u2014 sourced directly from qualified Chinese manufacturers. Contact us for specifications and pricing.<\/p>\n

Contact Us →<\/a><\/div>\n

\u1019\u1000\u103c\u102c\u1001\u100f\u1019\u1031\u1038\u101c\u1031\u1037\u101b\u103e\u102d\u101e\u1031\u102c \u1019\u1031\u1038\u1001\u103d\u1014\u103a\u1038\u1019\u103b\u102c\u1038<\/h2>\n
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\nDo Chinese manufacturers always draw in first-angle projection?+<\/span><\/summary>\n
The GB\/T national standard specifies first-angle projection, and most Chinese factories follow this convention. However, factories that regularly export to North America sometimes produce drawings in third-angle projection to accommodate their customers’ preferences, and some larger factories use CAD systems configured for third-angle by default. Always check the projection symbol in the title block rather than assuming \u2014 misreading the projection is the most common source of dimension interpretation errors in international sourcing.<\/div>\n<\/details>\n
\nWhat is the Chinese standard for gear module and tooth profile?+<\/span><\/summary>\n
Chinese gear standards (GB\/T 1357 for module, GB\/T 1356 for basic rack tooth profile) are fully aligned with ISO 54 and ISO 53. Module values follow the standard series (1, 1.25, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10). Pressure angle is typically 20 degrees for agricultural gears. These values are directly interchangeable with ISO gears of the same module \u2014 a Chinese module 4 gear will mesh correctly with a European or Japanese module 4 gear of the same tooth count and pressure angle.<\/div>\n<\/details>\n
\nWhere can I source agricultural parts from qualified Chinese suppliers?+<\/span><\/summary>\n
PRR Tractor Part Limited Partnership sources agricultural transmission parts \u2014 gearboxes, gears, sprockets, chains, and PTO shafts \u2014 directly from qualified Chinese manufacturers and supplies to B2B buyers worldwide. Contact sales@agricultural-parts.top for specifications, pricing, and minimum order information. Browse our available stock at our gearbox catalog<\/a>.<\/div>\n<\/details>\n<\/div>\n
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Agricultural Parts Sourced Directly from China<\/p>\n

Gearboxes, gears, sprockets, chains, and PTO shafts from qualified Chinese manufacturers \u2014 contact us for B2B pricing and specifications.<\/p>\n

Browse Parts<\/a>\u1000\u103c\u103e\u1014\u103b\u102f\u1015\u103b\u1010\u102d\u102f\u1037\u1000\u102d\u102f\u1006\u1000\u103b\u101e\u103e\u101a\u103b\u101b\u1014\u103b<\/a><\/div>\n

PRR \u1011\u103d\u1014\u103a\u1005\u1000\u103a \u1021\u1005\u102d\u1010\u103a\u1021\u1015\u102d\u102f\u1004\u103a\u1038 \u101c\u102e\u1019\u102d\u1010\u1000\u103a \u1019\u102d\u1010\u103a\u1016\u1000\u103a | sales@agricultural-parts.top
304\/1170 Soi Phahonyothin 49\/1, Intersection 6, Talat Bang Khen District, Lak Si District<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Agricultural Knowledge|PRR Tractor Part Limited Partnership|8 min read How to Read a Chinese Agricultural Parts Technical Drawing Chinese agricultural parts technical drawings follow the GB\/T (Guobiao) national standard, which is based on the ISO drawing standard but differs from the ANSI\/ASME system used in North America and from the BS 308 system used in the […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[2953],"tags":[],"class_list":["post-2824","post","type-post","status-publish","format-standard","hentry","category-b2b-sourcing"],"_links":{"self":[{"href":"https:\/\/www.agricultural-parts.top\/my\/wp-json\/wp\/v2\/posts\/2824","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.agricultural-parts.top\/my\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.agricultural-parts.top\/my\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.agricultural-parts.top\/my\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.agricultural-parts.top\/my\/wp-json\/wp\/v2\/comments?post=2824"}],"version-history":[{"count":0,"href":"https:\/\/www.agricultural-parts.top\/my\/wp-json\/wp\/v2\/posts\/2824\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.agricultural-parts.top\/my\/wp-json\/wp\/v2\/media?parent=2824"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.agricultural-parts.top\/my\/wp-json\/wp\/v2\/categories?post=2824"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.agricultural-parts.top\/my\/wp-json\/wp\/v2\/tags?post=2824"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}