Fastener Products
IndustrialNuts
Complete range of industrial nuts — hex nuts, flange nuts, lock nuts, coupling nuts and more. Manufactured to ISO, DIN, ASME and ASTM standards in all grades and materials. ISO 9001:2015 certified.
500+ SKUs
ISO 9001:2015
DIN · ISO · ASME · ASTM
M3 – M100
CS · SS · Alloy · Inconel
48hr Dispatch
Product Range
Types of Nuts We Manufacture
All nut types manufactured in-house to international standards — available in carbon steel, stainless steel, alloy steel and exotic grades.
Most Popular
Hex Nuts
DIN 934 · ISO 4032 · ASME B18.2.2
Standard six-sided nut for general purpose bolting applications across all industries
High Demand
Flange Nuts
DIN 6923 · ISO 4161
Serrated and non-serrated flange face — distributes load and resists loosening
Vibration Proof
Lock Nuts
DIN 985 · DIN 980 · ISO 7042
Nylon insert and all-metal prevailing torque type for vibration-resistant assemblies
Extension
Coupling / Long Nuts
DIN 6334 · ISO 4033
Used to join two threaded rods or extend bolt length in structural and civil applications
Decorative
Cap / Dome Nuts
DIN 1587 · ISO 4035
Acorn / dome nuts to cover exposed bolt ends — decorative and protective finish
Hand Tighten
Wing Nuts
DIN 315 · ISO 315
Butterfly wings allow hand tightening without tools — used in formwork and temporary fixing
Heavy Duty
Heavy Hex Nuts
ASTM A194 · ASME B18.2.2
Larger across-flats dimension for high-pressure flanged joints in oil & gas and power plants
Thin Profile
Jam Nuts
DIN 439 · ISO 4035
Half-height thin nut used as a locknut when two nuts are torqued together (jam nut method)
Structural
Square & Weld Nuts
DIN 557 · DIN 928 · ISO 4033
Square nuts for channel bolting and weld nuts for welding to sheets and frames
Complete List
Every Nut Type We Make
Full list of all nut types manufactured and exported by RR Hydraulic — available in all grades, materials and finishes.
Hex & Heavy Hex Nuts
8 TypesFlange & Lock Nuts
6 TypesCoupling & Extension Nuts
4 TypesTechnical Specifications
Nut Specifications & Standards
Click any nut type to see full specifications, dimensions, mechanical properties and applicable standards.
DIN 934
Hex Nut — Standard Specification
DIN 934 / ISO 4032 / ASME B18.2.2
Standards
Size Range
M3 to M100 (metric) · ¼” to 4″ (inch)
Grades
Materials
Finish Options
Thread Type
Metric Coarse (standard) · Metric Fine (on request) · UNC / UNF (inch)
ASTM A194
Heavy Hex Nut — Specification
ASTM A194 / ASME B18.2.2
Key Grades
Pairing Guide
A194 2H nuts pair with A193 B7 studs · A194 8M pairs with A193 B8M · Always match nut and bolt grades for correct joint integrity
Size Range
¼” to 4″ / M6 to M100 · All sizes stocked
Applications
High-pressure flanged joints · Oil & gas piping · Power plants · Petrochemical plants · Heat exchangers
Standards
DIN 985
Nylon Insert Lock Nut — Specification
DIN 985 / ISO 7042 — Vibration Resistant
Standards
Size Range
M5 to M64 (nylon insert) · M5 to M36 (all-metal prevailing torque)
Important Notes
Nylon insert lock nuts should not be used above 120°C — the nylon softens. For high-temperature applications, use all-metal prevailing torque nuts (DIN 980) or Nord-Lock washers instead.
Materials
DIN 6923
Flange Nut — Specification
DIN 6923 / ISO 4161 — Serrated & Non-Serrated
Standards
Key Feature
The integrated flange acts as a built-in washer — distributes clamping load over a larger area. Serrated flange bites into the surface to resist rotation and vibration loosening.
Size Range
M5 to M24 (standard stock) · M30+ on special order
Materials
Dimensions
Nut Dimension Tables
Standard dimensions for common nut types. All dimensions in mm unless stated.
| Size | Width A/F (s) | Width A/C (e) | Height (m) | Wt/100 CS (kg) | Wt/100 SS 304 (kg) | Wt/100 SS 316 (kg) | Pcs/kg (CS) |
|---|---|---|---|---|---|---|---|
| M6 | 10.0 | 11.05 | 5.2 | 0.18 | 0.19 | 0.19 | 556 |
| M8 | 13.0 | 14.38 | 6.8 | 0.42 | 0.43 | 0.43 | 238 |
| M10 | 17.0 | 18.90 | 8.4 | 0.84 | 0.85 | 0.86 | 119 |
| M12 | 19.0 | 21.10 | 10.8 | 1.44 | 1.46 | 1.47 | 69 |
| M16 | 24.0 | 26.75 | 14.8 | 3.58 | 3.63 | 3.64 | 28 |
| M20 | 30.0 | 33.53 | 18.0 | 7.06 | 7.16 | 7.19 | 14 |
| M24 | 36.0 | 39.98 | 21.5 | 12.24 | 12.42 | 12.47 | 8.2 |
| M30 | 46.0 | 50.85 | 25.6 | 25.50 | 25.87 | 25.97 | 3.9 |
| M36 | 55.0 | 60.79 | 31.0 | 45.30 | 45.95 | 46.13 | 2.2 |
| M42 | 65.0 | 71.30 | 34.0 | 75.20 | 76.27 | 76.58 | 1.33 |
| M48 | 75.0 | 82.60 | 38.0 | 116.40 | 118.06 | 118.54 | 0.86 |
| M56 | 85.0 | 93.56 | 45.0 | 188.30 | 191.00 | 191.78 | 0.53 |
| M64 | 95.0 | 104.86 | 51.0 | 280.50 | 284.51 | 285.63 | 0.36 |
DIN 934 / ISO 4032 · All dimensions in mm · Weights kg per 100 pieces · Carbon steel Grade 8 · ±3% tolerance
| Size (inch) | Size (metric) | Width A/F (mm) | Height (mm) | Wt/pc CS (kg) | Grade | Pairing Stud |
|---|---|---|---|---|---|---|
| ½” | M12 | 22.2 | 11.1 | 0.022 | 2H | A193 B7 |
| ¾” | M20 | 34.9 | 17.5 | 0.078 | 2H | A193 B7 |
| 1″ | M24/M25 | 41.3 | 22.2 | 0.135 | 2H4 | A193 B7 |
| 1¼” | M30 | 50.8 | 27.8 | 0.254 | 2H | A193 B7 |
| 1½” | M36/M38 | 60.3 | 33.3 | 0.445 | 2H7 | A193 B7/L7 |
| 1¾” | M42/M45 | 69.9 | 38.9 | 0.698 | 2H | A193 B7 |
| 2″ | M48/M52 | 79.4 | 44.4 | 1.025 | 2H4 | A193 B7 |
| 2½” | M64 | 98.4 | 55.6 | 1.960 | 2H | A193 B7 |
| 3″ | M76 | 117.5 | 66.7 | 3.360 | 2H | A193 B7 |
ASTM A194 · ASME B18.2.2 · Weights per piece in kg · Grade 2H most common for flanged joints
| Size | Width A/F | Height (m) | Nylon Insert Ht. | Wt/100 CS (kg) | Wt/100 SS 304 (kg) | Max Temp |
|---|---|---|---|---|---|---|
| M5 | 8.0 | 5.0 | 1.5 | 0.10 | 0.10 | 120°C |
| M6 | 10.0 | 6.0 | 2.0 | 0.20 | 0.20 | 120°C |
| M8 | 13.0 | 8.0 | 2.5 | 0.49 | 0.50 | 120°C |
| M10 | 17.0 | 10.0 | 3.0 | 0.96 | 0.97 | 120°C |
| M12 | 19.0 | 12.0 | 3.5 | 1.68 | 1.70 | 120°C |
| M16 | 24.0 | 16.0 | 4.5 | 4.20 | 4.26 | 120°C |
| M20 | 30.0 | 20.0 | 5.5 | 8.22 | 8.34 | 120°C |
| M24 | 36.0 | 24.0 | 6.0 | 14.40 | 14.61 | 120°C |
| M30 | 46.0 | 29.0 | 7.0 | 29.90 | 30.33 | 120°C |
| M36 | 55.0 | 35.0 | 8.0 | 53.80 | 54.57 | 120°C |
DIN 985 Nylon Insert Lock Nut · Max temperature 120°C (nylon insert) · For higher temps use DIN 980 all-metal prevailing torque nut · Weights kg per 100 pcs
| Size | Width A/F | Flange Dia (dc) | Nut Height (m) | Total Height | Wt/100 CS (kg) | Wt/100 SS (kg) |
|---|---|---|---|---|---|---|
| M5 | 8.0 | 11.8 | 5.0 | 6.5 | 0.22 | 0.22 |
| M6 | 10.0 | 14.2 | 6.0 | 7.5 | 0.41 | 0.42 |
| M8 | 13.0 | 17.9 | 8.0 | 9.5 | 0.90 | 0.91 |
| M10 | 15.0 | 21.8 | 10.0 | 12.0 | 1.62 | 1.64 |
| M12 | 18.0 | 26.0 | 12.0 | 14.5 | 2.90 | 2.94 |
| M16 | 24.0 | 34.5 | 16.0 | 19.0 | 7.34 | 7.44 |
| M20 | 30.0 | 42.8 | 20.0 | 24.0 | 14.28 | 14.49 |
| M24 | 36.0 | 51.1 | 24.0 | 28.5 | 24.60 | 24.95 |
DIN 6923 Serrated Flange Nut · All dims in mm · Weights kg per 100 pcs · Carbon steel Grade 8 · SS 304 weights ±1.5%
Materials We Use
Nut Materials & Grades
We manufacture nuts in all standard and exotic material grades — from carbon steel to Inconel 718.
Carbon Steel
Grade 5 · Grade 8 · Grade 10
Most economical option for general purpose applications. Available in zinc plated, HDG and black oxide finishes.
Stainless Steel
SS 304 · SS 316 · SS 316L · SS 310 · SS 321
Excellent corrosion resistance. SS 316/316L for marine, chemical and food-grade environments.
Alloy Steel
ASTM A194 2H · 4 · 7 · 7M
High-strength alloy nuts for high-temperature and high-pressure bolted flange joints in oil & gas.
Duplex SS
UNS S31803 · S32205 · S32750
Superior strength and corrosion resistance — subsea, offshore and chemical processing applications.
Inconel
Inconel 600 · 625 · 718 · 825
Nickel-chromium superalloy for extreme temperatures — turbines, aerospace and petrochemical reactors.
Monel
Monel 400 · K500
Nickel-copper alloy resistant to seawater and hydrofluoric acid — marine and chemical environments.
Hastelloy
C-276 · C-22 · B-2
Maximum corrosion resistance to oxidising and reducing acids — pharmaceutical, FGD systems.
Brass & Others
Brass · Copper · Aluminium · Nylon
Brass for electrical/plumbing; aluminium for lightweight applications; nylon for insulation and non-metallic joints.
Resources
Downloads & Datasheets
Download our nut catalogues, dimension charts and material grade reference documents.
Nuts Product Catalogue
Complete range — all nut types, grades, sizes, materials and standards in one PDF
Download PDF
Nut Dimension Chart
Hex, heavy hex, flange and lock nut dimensions — DIN, ISO, ASME sizes M3 to M100
Download PDF
ISO 9001:2015 Certificate
Quality management system certification — available for all procurement and tendering
Download PDF
You May Also Need
Related Products
Commonly ordered together with nuts.
