GB\/T 2516-2003 specifies the limit deviations for ordinary metric screw threads, providing essential tolerances for manufacturing and quality control in mechanical engineering. This standard ensures interchangeability and reliability of threaded components across various industries, such as automotive, aerospace, and machinery. It covers deviations for major, pitch, and minor diameters in microns, applicable to threads with pitches from 0.2 mm to 8 mm and basic major diameters up to 355 mm. Understanding these deviations is crucial for engineers to select appropriate tolerance zones like 4H, 5G, 6H, etc., balancing precision with cost-effectiveness.<\/p>\n
The standard replaces earlier versions and aligns with international norms like ISO 965, promoting global compatibility. Key benefits include reduced assembly issues and enhanced product lifespan through precise fit control.<\/p>\n
This standard applies to general-purpose metric screw threads as defined in GB\/T 193, excluding specialized threads like those for high-pressure applications. It is used in design, production, and inspection phases to define upper (ES\/es) and lower (EI\/ei) deviations for internal and external threads.<\/p>\n
In practice, select tolerance based on functional requirements: tighter for high-load scenarios, looser for general assembly.<\/p>\n
To apply this standard effectively, familiarize with these terms:<\/p>\n
Deviations are in microns (\u00b5m), positive for allowance above nominal, negative below.<\/p>\n
Internal threads (nuts) have deviations specified for pitch diameter and minor diameter. ES represents the upper limit, EI the lower. For example, in tolerance zone 6H, deviations ensure a clearance fit with external threads. Always verify against the basic major diameter and pitch to avoid interference.<\/p>\n
Practical tip: Use gauging tools like go\/no-go plugs to inspect compliance, ensuring threads meet minimum strength requirements.<\/p>\n
External threads (bolts) include deviations for pitch diameter, major diameter, and minor diameter (stress-related). es\/ei are used, with negative values common for external to provide allowance. For instance, 6g zone offers medium tolerance suitable for general machinery.<\/p>\n
Guidance: In high-vibration environments, opt for tighter zones like 4h to minimize loosening risks.<\/p>\n
The following tables present limit deviations in microns (\u00b5m) for selected pitches and diameters, extracted and organized from GB\/T 2516-2003. Values are for common tolerance zones. For full details, consult the official standard document.<\/p>\n
| Basic Major Diameter (mm)<\/th>\n | From ><\/th>\n | To \u2264<\/th>\n | B\u01b0\u1edbc ren (mm)<\/th>\n | Internal Thread Tolerance Zones<\/th>\n | External Thread Tolerance Zones<\/th>\n<\/tr>\n | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Th\u1ea5p h\u01a1n<\/th>\n | Upper<\/th>\n | Th\u1ea5p h\u01a1n<\/th>\n | Upper<\/th>\n | 4H (ES)<\/th>\n | 5G\/5H<\/th>\n | 6G\/6H<\/th>\n | 7G\/7H<\/th>\n | 8G\/8H<\/th>\n | 4h (es)<\/th>\n | 5g\/5h<\/th>\n | 6g\/6h<\/th>\n | 7g\/7h<\/th>\n | 8g\/8h<\/th>\n | Stress Deviation<\/th>\n<\/tr>\n<\/thead>\n |
| 0.99 – 1.4<\/td>\n | 0.99<\/td>\n | 1.4<\/td>\n | 0.2<\/td>\n | \/<\/td>\n | 40<\/td>\n | \/<\/td>\n | \/<\/td>\n | \/<\/td>\n | \/<\/td>\n | 0<\/td>\n | \/<\/td>\n | \/<\/td>\n | \/<\/td>\n | \/<\/td>\n<\/tr>\n |
| 1.4 – 2.8<\/td>\n | 1.4<\/td>\n | 2.8<\/td>\n | 0.25<\/td>\n | \/<\/td>\n | 45<\/td>\n | 74<\/td>\n | 76<\/td>\n | \/<\/td>\n | \/<\/td>\n | 0<\/td>\n | 18<\/td>\n | 0<\/td>\n | \/<\/td>\n | \/<\/td>\n<\/tr>\n <\/p>\n |
| 180 – 355<\/td>\n | 180<\/td>\n | 355<\/td>\n | 8<\/td>\n | \/<\/td>\n | 300<\/td>\n | 475<\/td>\n | 375<\/td>\n | \/<\/td>\n | \/<\/td>\n | \/<\/td>\n | 575<\/td>\n | 475<\/td>\n | \/<\/td>\n | 700<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Note: ‘\/’ indicates not applicable. For pitches like 8 mm, apply only to diameters \u2265125 mm. Consult full standard for complete data.<\/p>\n C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQ)<\/h2>\n<\/p>","protected":false},"excerpt":{"rendered":" Introduction to the B\/T 2516-2003 Standard GB\/T 2516-2003 specifies the limit deviations for ordinary metric screw threads, providing essential tolerances for manufacturing and quality control in mechanical engineering. This standard ensures interchangeability and reliability of threaded components across various industries, such as automotive, aerospace, and machinery. It covers deviations for major, pitch, and minor diameters […]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[220],"tags":[],"class_list":["post-5771","post","type-post","status-publish","format-standard","hentry","category-technical-documentation-and-references"],"_links":{"self":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts\/5771","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/comments?post=5771"}],"version-history":[{"count":2,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts\/5771\/revisions"}],"predecessor-version":[{"id":5773,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts\/5771\/revisions\/5773"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/media?parent=5771"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/categories?post=5771"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/tags?post=5771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} |