{"id":5557,"date":"2025-12-19T08:17:10","date_gmt":"2025-12-19T08:17:10","guid":{"rendered":"https:\/\/korea-transmission.com\/?p=5557"},"modified":"2025-12-19T08:17:10","modified_gmt":"2025-12-19T08:17:10","slug":"mechanical-performance-standards-for-nuts-gb-t-3098-2-2015","status":"publish","type":"post","link":"https:\/\/korea-transmission.com\/fr\/blog\/mechanical-performance-standards-for-nuts-gb-t-3098-2-2015\/","title":{"rendered":"Mechanical Performance Standards for Nuts: GB\/T 3098.2-2015"},"content":{"rendered":"
\n

GB\/T 3098.2-2015 specifies the mechanical properties of coarse thread nuts made from carbon steel and alloy steel, applicable for general engineering purposes. This standard aligns closely with international norms such as ISO 898-2, ensuring compatibility in fastener systems. It covers performance grades from 4 to 12, focusing on proof load, chemical composition, hardness, and compatibility with bolts, screws, or studs. Below, key aspects are detailed with data extracted from the standard for precise reference.<\/p>\n

Proof Load Values for Coarse Thread Nuts<\/h2>\n

The proof load represents the maximum load a nut can withstand without permanent deformation, essentially the minimum tensile strength it must endure. Units are in Newtons (N). The following table provides proof load values for various thread sizes and performance grades.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Fil<\/th>\nPas<\/th>\nGrade 04 (N)<\/th>\nGrade 05 (N)<\/th>\nGrade 5 (N)<\/th>\nGrade 6 (N)<\/th>\nGrade 8 (N)<\/th>\nGrade 10 (N)<\/th>\nGrade 12 (N)<\/th>\n<\/tr>\n<\/thead>\n
M5<\/td>\n0.8<\/td>\n5400<\/td>\n7100<\/td>\n8250<\/td>\n9500<\/td>\n12140<\/td>\n14800<\/td>\n16300<\/td>\n<\/tr>\n
M6<\/td>\n1<\/td>\n7640<\/td>\n10000<\/td>\n11700<\/td>\n13500<\/td>\n17200<\/td>\n20900<\/td>\n23100<\/td>\n<\/tr>\n
M7<\/td>\n1<\/td>\n11000<\/td>\n14500<\/td>\n16800<\/td>\n19400<\/td>\n24700<\/td>\n30100<\/td>\n33200<\/td>\n<\/tr>\n
M8<\/td>\n1.25<\/td>\n13900<\/td>\n18300<\/td>\n21600<\/td>\n24900<\/td>\n31800<\/td>\n38100<\/td>\n42500<\/td>\n<\/tr>\n
M10<\/td>\n1.5<\/td>\n22000<\/td>\n29000<\/td>\n34200<\/td>\n39400<\/td>\n50500<\/td>\n60300<\/td>\n67300<\/td>\n<\/tr>\n
M12<\/td>\n1.75<\/td>\n32000<\/td>\n42200<\/td>\n51400<\/td>\n59000<\/td>\n74200<\/td>\n88500<\/td>\n100300<\/td>\n<\/tr>\n
M14<\/td>\n2<\/td>\n43700<\/td>\n57500<\/td>\n70200<\/td>\n80500<\/td>\n101200<\/td>\n120800<\/td>\n136900<\/td>\n<\/tr>\n
M16<\/td>\n2<\/td>\n59700<\/td>\n78500<\/td>\n95800<\/td>\n109900<\/td>\n138200<\/td>\n164900<\/td>\n186800<\/td>\n<\/tr>\n
M18<\/td>\n2.5<\/td>\n73000<\/td>\n96000<\/td>\n121000<\/td>\n138200<\/td>\n176600<\/td>\n203500<\/td>\n230400<\/td>\n<\/tr>\n
M20<\/td>\n2.5<\/td>\n93100<\/td>\n122500<\/td>\n154400<\/td>\n176400<\/td>\n225400<\/td>\n259700<\/td>\n294000<\/td>\n<\/tr>\n
M22<\/td>\n2.5<\/td>\n115100<\/td>\n151500<\/td>\n190900<\/td>\n218200<\/td>\n278800<\/td>\n321200<\/td>\n363600<\/td>\n<\/tr>\n
M24<\/td>\n3<\/td>\n134100<\/td>\n176500<\/td>\n222400<\/td>\n254200<\/td>\n324800<\/td>\n374200<\/td>\n423600<\/td>\n<\/tr>\n
M27<\/td>\n3<\/td>\n174400<\/td>\n229500<\/td>\n289200<\/td>\n330500<\/td>\n422300<\/td>\n486500<\/td>\n550800<\/td>\n<\/tr>\n
M30<\/td>\n3.5<\/td>\n213200<\/td>\n280500<\/td>\n353400<\/td>\n403900<\/td>\n516100<\/td>\n594700<\/td>\n673200<\/td>\n<\/tr>\n
M33<\/td>\n3.5<\/td>\n263700<\/td>\n347000<\/td>\n437200<\/td>\n499700<\/td>\n638500<\/td>\n735600<\/td>\n832800<\/td>\n<\/tr>\n
M36<\/td>\n4<\/td>\n310500<\/td>\n408500<\/td>\n514700<\/td>\n588200<\/td>\n751600<\/td>\n866000<\/td>\n980400<\/td>\n<\/tr>\n
M39<\/td>\n4<\/td>\n370900<\/td>\n488000<\/td>\n614900<\/td>\n702700<\/td>\n897900<\/td>\n1035000<\/td>\n1171000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

These values are critical for selecting nuts in applications where load-bearing capacity is paramount, such as in structural assemblies or machinery.<\/p>\n

Chemical Composition Requirements<\/h2>\n

The standard specifies chemical limits for carbon steel nuts to ensure proper heat treatment and performance. Maximum values for carbon (C), phosphorus (P), and sulfur (S), along with minimum manganese (Mn), are outlined below. Heat treatment types include optional quenching and tempering for lower grades and mandatory for higher ones.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Niveau de performance<\/th>\nMat\u00e9riel<\/th>\nHeat Treatment<\/th>\nC (%) max<\/th>\nMn (%) min<\/th>\nP (%) max<\/th>\nS (%) max<\/th>\n<\/tr>\n<\/thead>\n
4<\/td>\nCarbon steel<\/td>\nOptional<\/td>\n0.58<\/td>\n0.25<\/td>\n0.060<\/td>\n0.150<\/td>\n<\/tr>\n
5<\/td>\nCarbon steel<\/td>\nQuenched and tempered<\/td>\n0.58<\/td>\n0.30<\/td>\n0.048<\/td>\n0.058<\/td>\n<\/tr>\n
5<\/td>\nCarbon steel<\/td>\nOptional<\/td>\n0.58<\/td>\n–<\/td>\n0.060<\/td>\n0.150<\/td>\n<\/tr>\n
6<\/td>\nCarbon steel<\/td>\nOptional<\/td>\n0.58<\/td>\n–<\/td>\n0.060<\/td>\n0.150<\/td>\n<\/tr>\n
8<\/td>\nTall nut (Style 2)<\/td>\nOptional<\/td>\n0.58<\/td>\n0.25<\/td>\n0.060<\/td>\n0.150<\/td>\n<\/tr>\n
8<\/td>\nStandard nut (Style 1) D \u2264 M16<\/td>\nOptional<\/td>\n0.58<\/td>\n0.25<\/td>\n0.060<\/td>\n0.150<\/td>\n<\/tr>\n
8<\/td>\nStandard nut (Style 1) D > M16<\/td>\nQuenched and tempered<\/td>\n0.58<\/td>\n0.30<\/td>\n0.048<\/td>\n0.058<\/td>\n<\/tr>\n
10<\/td>\nCarbon steel<\/td>\nQuenched and tempered<\/td>\n0.58<\/td>\n0.30<\/td>\n0.048<\/td>\n0.058<\/td>\n<\/tr>\n
12<\/td>\nCarbon steel<\/td>\nQuenched and tempered<\/td>\n0.58<\/td>\n0.45<\/td>\n0.048<\/td>\n0.058<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Note: For grades requiring quenching and tempering, materials must exhibit sufficient hardenability to achieve approximately 90% martensite in the thread section before tempering. Chemical composition evaluations should follow relevant standards.<\/p>\n

Exigences de duret\u00e9<\/h2>\n

Hardness is measured in Vickers (HV), Brinell (HB), and Rockwell C (HRC) scales, with ranges varying by nut size and grade. These ensure the nut’s resistance to deformation under load.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Thread Size<\/th>\nGrade 04<\/th>\nGrade 05<\/th>\nGrade 5<\/th>\nGrade 6<\/th>\nGrade 8<\/th>\nGrade 10<\/th>\nGrade 12<\/th>\n<\/tr>\n
<\/th>\nScale<\/th>\nMin<\/th>\nMax<\/th>\nMin<\/th>\nMax<\/th>\nMin<\/th>\nMax<\/th>\nMin<\/th>\nMax<\/th>\nMin<\/th>\nMax<\/th>\nMin<\/th>\nMax<\/th>\nMin<\/th>\nMax<\/th>\n<\/tr>\n<\/thead>\n
M5 \u2264 D \u2264 M16<\/td>\nHV<\/td>\n188<\/td>\n302<\/td>\n272<\/td>\n353<\/td>\n130<\/td>\n302<\/td>\n150<\/td>\n302<\/td>\n200<\/td>\n302<\/td>\n272<\/td>\n353<\/td>\n295<\/td>\n353<\/td>\n<\/tr>\n
M16 < D \u2264 M39<\/td>\nHV<\/td>\n188<\/td>\n302<\/td>\n272<\/td>\n353<\/td>\n146<\/td>\n302<\/td>\n170<\/td>\n302<\/td>\n233<\/td>\n353<\/td>\n272<\/td>\n353<\/td>\n272<\/td>\n353<\/td>\n<\/tr>\n
M5 \u2264 D \u2264 M16<\/td>\nHB<\/td>\n179<\/td>\n287<\/td>\n259<\/td>\n336<\/td>\n124<\/td>\n287<\/td>\n143<\/td>\n287<\/td>\n190<\/td>\n287<\/td>\n259<\/td>\n336<\/td>\n280<\/td>\n336<\/td>\n<\/tr>\n
M16 < D \u2264 M39<\/td>\nHB<\/td>\n179<\/td>\n287<\/td>\n259<\/td>\n336<\/td>\n139<\/td>\n287<\/td>\n162<\/td>\n287<\/td>\n221<\/td>\n336<\/td>\n259<\/td>\n336<\/td>\n259<\/td>\n336<\/td>\n<\/tr>\n
M5 \u2264 D \u2264 M16<\/td>\nHRC<\/td>\n–<\/td>\n30<\/td>\n26<\/td>\n36<\/td>\n–<\/td>\n30<\/td>\n–<\/td>\n30<\/td>\n–<\/td>\n30<\/td>\n26<\/td>\n36<\/td>\n29<\/td>\n36<\/td>\n<\/tr>\n
M16 < D \u2264 M39<\/td>\nHRC<\/td>\n–<\/td>\n30<\/td>\n26<\/td>\n36<\/td>\n–<\/td>\n30<\/td>\n–<\/td>\n30<\/td>\n–<\/td>\n36<\/td>\n26<\/td>\n36<\/td>\n26<\/td>\n36<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Footnotes: For tall nuts (Style 2) in Grade 8, minimum hardness is 180 HV (171 HB). For Grade 8 tall nuts, maximum is 302 HV (287 HB, 30 HRC). For Grade 12 tall nuts, minimum is 272 HV (259 HB, 26 HRC).<\/p>\n

Compatibility with Bolts, Screws, or Studs<\/h2>\n

Nuts must match bolt grades to ensure joint integrity. The table below shows nut styles, nominal diameters, and compatible bolt grades.<\/p>\n\n\n\n\n\n\n\n\n
Nut Style<\/th>\nGrade 04<\/th>\nGrade 05<\/th>\nGrade 5<\/th>\nGrade 6<\/th>\nGrade 8<\/th>\nGrade 10<\/th>\nGrade 12<\/th>\n<\/tr>\n<\/thead>\n
Standard (Style 1)<\/td>\n–<\/td>\n–<\/td>\nM5 \u2264 D \u2264 M39 \/ M8x1 \u2264 D \u2264 M39x3<\/td>\nM5 \u2264 D \u2264 M39 \/ M8x1 \u2264 D \u2264 M39x3<\/td>\nM5 \u2264 D \u2264 M39 \/ M8x1 \u2264 D \u2264 M39x3<\/td>\nM5 \u2264 D \u2264 M39 \/ M8x1 \u2264 D \u2264 M16x1.5<\/td>\nM5 \u2264 D \u2264 M16<\/td>\n<\/tr>\n
Tall (Style 2)<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\nM16 \u2264 D \u2264 M39 \/ M8x1 \u2264 D \u2264 M16x1.5<\/td>\nM5 \u2264 D \u2264 M39 \/ M8x1 \u2264 D \u2264 M39x3<\/td>\nM5 \u2264 D \u2264 M39 \/ M8x1 \u2264 D \u2264 M16x1.5<\/td>\n<\/tr>\n
Thin (Style 0)<\/td>\nM5 \u2264 D \u2264 M39 \/ M8x1 \u2264 D \u2264 M39x3<\/td>\nM5 \u2264 D \u2264 M39 \/ M8x1 \u2264 D \u2264 M39x3<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
Compatible Bolt Grade (Max)<\/td>\n–<\/td>\n–<\/td>\n5.8<\/td>\n6.8<\/td>\n8.8<\/td>\n10.9<\/td>\n12.9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

This compatibility ensures that the nut does not fail before the bolt in tension, maintaining assembly safety.<\/p>\n

Torque Considerations<\/h2>\n

GB\/T 3098.2-2015 does not specify failure torque for nuts, as torque values are influenced by friction, lubrication, and assembly conditions. Instead, focus on proof load and preload for design. In practice, torque applied to nuts converts partially to clamping force, often around 20% efficiency depending on factors like surface finish. For reference, consult matching bolt torque values from standards like GB\/T 3098.1, but always verify through testing for specific applications.<\/p>\n

Foire aux questions (FAQ)<\/h2>\n
\n
1. What is the proof load in GB\/T 3098.2-2015?<\/dt>\n
The proof load is the axial tensile force that the nut must withstand without permanent deformation, serving as a measure of its load-bearing capacity.<\/dd>\n
2. How does heat treatment affect nut performance?<\/dt>\n
Quenching and tempering are required for higher grades (e.g., 8 for D > M16, 10, 12) to achieve necessary hardness and strength, ensuring at least 90% martensite structure before tempering.<\/dd>\n
3. Can Grade 8 nuts be used with Grade 10.9 bolts?<\/dt>\n
Yes, Grade 8 nuts are compatible with up to Grade 8.8 bolts, but for Grade 10.9, use Grade 10 nuts to match strength and avoid nut failure.<\/dd>\n
4. Why are phosphorus and sulfur limits stricter for higher grades?<\/dt>\n
Lower P and S content (e.g., 0.048% max for P in Grade 10) reduces embrittlement risks, improving toughness and reliability in high-stress applications.<\/dd>\n
5. How should hardness be tested for nuts?<\/dt>\n
Hardness is typically measured on the nut’s bearing surface or cross-section using HV, HB, or HRC methods, with values varying by size (e.g., higher minimum for smaller diameters in some grades).<\/dd>\n
6. What if a nut exceeds maximum hardness?<\/dt>\n
Excessive hardness can lead to brittleness; nuts must stay within specified ranges (e.g., max 353 HV for Grade 10) to balance strength and ductility.<\/dd>\n<\/dl>\n<\/div>","protected":false},"excerpt":{"rendered":"

GB\/T 3098.2-2015 specifies the mechanical properties of coarse thread nuts made from carbon steel and alloy steel, applicable for general engineering purposes. This standard aligns closely with international norms such as ISO 898-2, ensuring compatibility in fastener systems. It covers performance grades from 4 to 12, focusing on proof load, chemical composition, hardness, and compatibility […]<\/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-5557","post","type-post","status-publish","format-standard","hentry","category-technical-documentation-and-references"],"_links":{"self":[{"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/posts\/5557","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/comments?post=5557"}],"version-history":[{"count":1,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/posts\/5557\/revisions"}],"predecessor-version":[{"id":5558,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/posts\/5557\/revisions\/5558"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/media?parent=5557"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/categories?post=5557"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/tags?post=5557"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}