Who has the standards for studs/nuts?

Bolts: Types, specifications, and technical requirements Sequence Number Name and standard number Specification range Product grade Thread tolerance Material and performance grade Surface treatment 1 Hex head bolts, Grade C GB/T5780-2000 M5～M64, Grade C 8g Steel: for d≤39: 3.6, 4.6, 4.8； d＞39: Per the specification, options are 1. no treatment, 2. electroplating, 3. electroless zinc powder coating. 2 Hex head bolts, fully threaded, grade C, GB/T5781-2000; sizes M5–M64, grade C. 8g steel: d≤39: 3.6, 4.6, 4.8 ； d＞39: Per the agreement, 1. No treatment; 2. Electroplating; 3. Electroless zinc powder coating. Hex head bolts, GB/T5782-2000, grades A and B, size M1.6～M64. Steel grade 6G: d＜3: Per the agreement ； 3≤d≤39: 5.6, 8.8, 10.9 ； 3≤d≤16: 9.8; d＞39: Per the protocol 1. No treatment 2. Electroplating 3. Electroless zinc powder coating Stainless steel: d≤24: A2-70, A4-70 ； 24＜d≤39: A2-50, A4-50 ； d＞39: Handle simply per the agreement. Non-ferrous metals: CU2, CU3, AL4. 4 hex head bolts, fully threaded, GB/T5783-2000, sizes M1.6～M64, grades A and B. 6g steel: d＜3: Per the agreement ； 3≤d≤39: 5.6, 8.8, 10.9 ； 3≤d≤16: 9.8; d＞39: Per the protocol 1. No treatment 2. Electroplating 3. Electroless zinc powder coating Stainless steel: d≤24: A2-70, A4-70 ； 24＜d≤39: A2-50, A4-50 ； d＞39: Treated simply as per the agreement. Non-ferrous metals: CU2, CU3, AL4. 5 Hex head bolts – thin shank – Grade B, GB/T5784-1986; sizes M3–M20, Grade B. 6g steel: grades 5.8, 6.8, 8.8. Treatment options: 1. No treatment; 2. Electroplating; 3. Oxidation. Stainless steel: A2-70, no treatment required. 6 Hex head bolts with fine threads, GB/T5785-2000; sizes M8×1–M64×4, Grades A and B. 6g steel: when d≤3, treated as per the agreement ； d≤39: 5.6, 8.8, 10.9 ； 3＜d≤16: 9.8; d＞39: According to the protocol 1. No treatment 2. Electroplating 3. Electroless zinc powder coating. Stainless steel: d≤24: A2-70, A4-70 ； 24＜d≤39: A2-50, A4-50 ； d＞39: Processed simply in accordance with the agreement. Non-ferrous metals: CU2, CU3, AL4. Serial number, name and standard number, specification range, product grade, thread tolerance, material and performance grade, surface treatment. 7 Hex head bolts, fine-thread full threads. GB/T5785-2000. M8×1～M64×4, Grades A and B. 6g. Steel: d≤39: 5.6, 8.8, 10.9 ； d＞39: Per the agreement, 1. no treatment, 2. electroplating, 3. electroless zinc powder coating. Stainless steel: d≤24: A2-70, A4-70 ； 24＜d≤39: A2-50, A4-50 ； d＞39: Treated simply in accordance with the specifications. Non-ferrous metals: CU2, CU3, AL4. Hex head bolts with grooves, grades A and B, GB/T29.1-1988, sizes M3–M12, grades A and B. 6g steel: 8.8, 10.9. Treatment methods: 1. Oxidation; 2. Electroplating. Stainless steel: A2-70, no treatment required. 9. Hex head bolts with cross-shaped slots, GB/T29.2-1988, sizes M4–M8, grade B. 6g steel: 5.8. Treatment methods: 1. No treatment; 2. Galvanizing and passivation. 10. Hex head screws with holes, grades A and B, GB/T31.1-1988, sizes M6–M48, grades A and B. 6g steel: For d≤39: 8.8, 10.9 ； d＞39: Per the protocol, 1. oxidation 2. zinc plating passivation; Stainless steel: d≤20: A2-70 ； 20＜d≤39: A2-50, A4-50 ； d＞39: As per the standard, untreated. Hex head screws with holes, thin shank, Grade B, GB/T31.2-1988. Sizes: M6–M20. Grades A and B. Steel grades: 6g – 5.8, 6.8, 8.8. Treatment methods: 1. Untreated; 2. Zinc plating followed by passivation; 3. Oxidation. Stainless steel: A2-70 ； Unprocessed 12 hex head screws with holes, fine thread grades A and B, GB/T31.1-1988, M8×1–M48×3, grades A and B; 6g steel: d≤39: 8.8, 10.9 ； d＞39: Per the protocol, 1. oxidation 2. zinc plating passivation; Stainless steel: d≤20: A2-70 ； 20＜d≤39：A2-50 ； d＞39: As per the standard, no treatment required; hex head bolts with holes, grades A and B, GB/T32.1-1988, sizes M6–M48, grades A and B; 6g steel. d≤39: 8.8, 10.9 ； d＞39: Per the protocol, 1. oxidation 2. zinc plating passivation; Stainless steel: d≤20: A2-70 ； 20＜d≤39：A2-50 ； d＞39: As per the standard, untreated. 14 hex head bolts with holes, thin shank, Grade B, GB/T32.2-1988. Sizes: M6–M20, Grade B. Steel grades: 5.8, 6.8, 8.8. Treatment methods: 1. Untreated; 2. Galvanized and passivated; 3. Oxidized. Stainless steel: A2-70 ； Unprocessed hex head bolts with holes in the head, fine thread grades A and B, GB/T32.3-1988, M8×1–M48×3, grades A and B; 6g steel: for d≤39: 8.8, 10.9 ； d＞39: According to the protocol, 1. oxidation and 2. zinc plating and passivation. Sequence, Name and Standard Number, Specification Range, Product Grade, Thread Tolerance, Material and Performance Grade, Surface Treatment: 15. Hex head bolts with holes – Fine thread, Grades A and B. GB/T32.3-1988, M8×1～M48×3, Grades A and B, 6g. Stainless steel: d≤20: A2-70 ； 20＜d≤39：A2-50 ； d＞39: As per the specification, no treatment is required; bolts for hex head threaded holes of grades A and B, GB/T27-1988, sizes M6–M48, grades A and B, 6g steel: d≤39: 8.8 ； d＞39: As per the specification, oxidize 17 hex head screws with drilled holes; use bolts of grades A and B according to GB/T2-1988, sizes M6–M48, grades A and B, 6g steel: d≤39: 8.8 ； d＞39: As per the standard, oxidation treatment for hex head flange bolts – enlarged series – Grade B, GB/T5789-1986; sizes M5–M20, Grade B. Steel grades 6g: 8.8, 12.9. Treatment options: 1. Oxidation; 2. Galvanizing. Stainless steel: A2-70, no treatment required. 19 Hex head flange bolts – enlarged series – thin shaft – Grade B, GB/T5789-1986; sizes M5–M20, Grade B. Steel grades 6g: 8.8, 12.9. Treatment options: 1. Oxidation; 2. Galvanizing. Stainless steel: A2-70, no treatment required. 20 Hex head flange bolts – small series, GB/T16674-1996; sizes M5–M16, Grade A. Steel grades 6g: 8.8, 12.9. Treatment options: 1. Oxidation; 2. Galvanizing. Stainless steel: A2-70, no treatment required. 21 Square head bolts, Grade C, GB/T8-1988; sizes M10–M48, Grade C. Steel grade 8g: For d≤39: 8.8 ； d＞39: According to the specification, options are 1. no treatment, 2. oxidation, 3. galvanizing and passivation. For 22 square head bolts, grade B per GB/T35-1988; sizes range from M5 to M48, grade B. Steel grade 6g: for d≤39, grades 5.8 and 8.8 ； d＞39: As per the agreement: 1. Unprocessed; 2. Galvanized and passivated. 23 Semi-round head, square neck bolts, Grade C, GB/T12-1988, M6–M20, Grade C; 8g steel: 3.6, 4.6, 4.8. 1. Unprocessed; 2. Oxidized; 3. Galvanized and passivated. 24 Small semi-round head, low square neck bolts, Grade B, GB/T801-1998, M6–M20, Grade B; 6g steel: 4.8, 8.8, 10.9. 1. Unprocessed; 2. Galvanized and passivated; 3. Hot-dip galvanized. 25 Large semi-round head, square neck bolts, Grade C, GB/T14-1998, M5–M20, Grade C; 8.8 grade: 6g steel; other grades: 8g steel: 4.6, 4.8, 8.8. 1. Unprocessed; 2. Oxidized for 8.8 grade; 3. Galvanized and passivated; 4. Hot-dip galvanized. 26 Reinforced semi-round head, square neck bolts, GB/T794-1993, M6–M20, Type A: Grade B; 6g steel: 8.8, oxidized; Type B: Grade C; 8g steel: 3.6, 4.8. 1. Unprocessed; 2. Oxidized. 27 Semi-round head, tenon-type bolts, GB/T13-1988, M6–M24, Grade C; 8g steel: 3.6, 4.6, 4.8. 1. Unprocessed; 2. Oxidized; 3. Galvanized and passivated. 28 Large semi-round head, tenon-type bolts, GB/T15-1988, M6–M24, Grade C; 8g steel: 3.6, 4.8. 1. Unprocessed; 2. Oxidized; 3. Galvanized and passivated. 29 Countersunk square neck bolts, GB/T10-1988, M6–M24, Grade C; 8g steel: 3.6, 4.6, 4.8. 1. Unprocessed; 2. Oxidized. Serial number, Name and standard number, Specification range, Product grade, Thread tolerance, Material and performance grade, Surface treatment. 30 Countersunk tenon-type bolts, GB/T11-1988, M6–M24, Grade C; 8g steel: 3.6, 4.6, 4.8. 1. Unprocessed; 2. Galvanized and passivated. 31 Countersunk double-tenon bolts, GB/T800-1988, M6–M12, Grade C; 8g steel: 4.8. 1. Unprocessed; 2. Oxidized; 3. Galvanized and passivated. 32 Bolts for T-slots, GB/T37-1988, M5–M48, Grade B; 6g steel: d≤39: 8.8; d＞39: As per the agreement. 1. Oxidized; 2. Galvanized and passivated. 33 Joining bolts, GB/T798-1988, M4–M36, Grade C; 8g steel: 4.6, 5.6. 1. Unprocessed; 2. Galvanized and passivated. 34 Foot bolts, GB/T799-1988, M6–M48, Grade C; 8g steel: d≤39: 8.8; d＞39: As per the agreement. 1. Unprocessed; 2. Oxidized; 3. Galvanized and passivated. 35 High-strength bolts for steel grid structure bolted joints, GB/T16939-1977, M12–M64×4, Grade B; 6g steel: 20MnTiB, 40Cr, 35CrMo: 10.9S, oxidized; 35VB, 40Cr, 35CrMo: 10.9S; 35CrMo, 40Cr: 9.8S

GB/T 5276-1985|Fasteners – Dimensional codes and markings for bolts, screws, studs, and nuts

It’s available in the mechanical manual; go to the forum and search to download it

I’ve already posted it in the standard upload and sharing section; you can go and take a look for yourself.

Could the original poster explain in more detail? I have some commonly used ones here; take a look and see if they can be useful! GB901-88 Equal-length double-headed studs, Grade B; GB3099-82 Terms and definitions for bolts, screws, nuts and accessories; GB 953-88 Equal-length double-headed bolts, Grade C; GB 3098.1-2000 Mechanical properties of fasteners – Bolts, screws and studs; GBT41-2000 Hex nuts, Grade C; GBT5780-2000 Hex head bolts – Grade C; GBT5781-2000 Hex head bolts with full threads, Grade C; GBT5782 Hex head bolts; GBT5783-2000 Hex head bolts with full threads; GBT5784-1986 Hex head bolts with thin shanks, Grade B; GBT5785-2000 Hex head bolts with fine threads; GBT5786-2000 Hex head bolts with fine threads and full threads; GBT6170-2000 Type 1 hex nuts

Thank you, it’s been informative, but I still don’t fully understand it

Search on the forum; these standards and specifications are all there. If there is no special design, just choose the standard option.

There are too many; you need to specify exactly what type of bolts and nuts you want

It’s available in both hardware manuals and machinery manuals