carbon steel round nuts

1. Excellent service within 24 hours response
2. High quality with competitive price for sale.
3. Delivery: within 7-15 days or according to quantity
4. Approved by ISO9001, SGS every year
5. Flexible MOQ – 100 pcs trial, volume discounts for bulk.
INTRODUCTION

Name

Carbon Steel Nut

Grade & Material

Grade 4: SWRCH6A / SWRCH8A / SWRCH10A / SWRCH18A / SWRCH22A / Q195 / Q235 / 10# / 15# / 20# / C10E / 1010 / 1018 / A307

Grade 8: 35# / 45# / ML35 / SWRCH32H / 20MnTiB / 40Cr / SCM435 / 35CrMoA / C35E / C45E / 1035 / 1045 / A325 / 4140

Grade 10: 40Cr / SCM435 / 35CrMoA / 42CrMoA / 20MnTiB / 4140 / 4145 / 4340 / A490

Grade 12: 42CrMoA / 42CrMo4 / SCM440 / 30CrMnSi / 4140 / 4340 / 8740

Surface

Plain / Black / Zinc Plated / Hot-Dip Galvanized / Dacromet / Geomet / Phosphated / Nickel Plated / Teflon Coated

Shipping Terms

EXW / FOB / CIF / CFR / CNF

Payment Terms

TT / LC (must 30-50% as despoit, the balance can be paid by LC after BL), etc

Packaging

Standard export packing, various transportation, according to customer needs.

Application

Steel Structure Construction and Bridges / Piping and Equipment Installation / Automobile Manufacturing / Shipbuilding and Vehicles / Machinery and Industrial Equipment / Energy and Power Equipment / Home Appliances / Electronics / Petrochemicals / Aerospace / Medical Devices, etc.


A nut is a threaded fastener with internal threads, used in conjunction with a mating bolt to secure assembled components. 

Its hexagonal shape allows easy tightening with standard tools. 


Carbon steel nuts provide reliable clamping force, high strength, and cost-effectiveness for industrial and construction applications.


SPECIFICATION

Available Sizes & Dimensions

Parameter

Metric (ISO)

Inch (ANSI/ASME)

Thread Diameter

M4 ~ M64

1/4" ~ 2-1/2"

Thread Pitch

Coarse / Fine per ISO 261/262

UNC / UNF per ASME B1.1

Thread Tolerance

6H (internal) per ISO 965-2

2B (internal) per ASME B1.1

Width Across Flats

Per DIN 934 / ISO 4032

Per ASME B18.2.2

Nut Height

Per DIN 934 / ISO 4032

Per ASME B18.2.2


Mechanical Properties

Grade

Proof Load (MPa)

Hardness (HV)

Hardness (HRB)

4

400

≤ 210

≤ 95

8

800

220-300

95-100

10

1000

280-350

—

12

1200

320-400

—


Thread Specifications

Parameter

Metric (ISO)

Inch (ANSI/ASME)

Thread Form

60° V-thread

60° V-thread (Unified)

Thread Standard

ISO 68-1, ISO 261, ISO 262

ASME B1.1

Pitch Designation

Coarse (M10×1.5) / Fine (M10×1.0)

UNC (1/2"-13) / UNF (1/2"-20)

Thread Tolerance

6H (internal) per ISO 965-2

2B (internal) per ASME B1.1


FAQ

FAQ


Q: What are the main products you can supply?

A: We are the professional and famous factory in China for steel pipe and fittings, such as flanges, elbows, bolts and nuts, etc.


Q: What is your minimum order quantity (MOQ)?

A: For trial orders, our MOQ is100 pcs per size. For bulk orders, MOQ is flexible — please contact us with your quantity for a competitive quote. Volume discounts are available for large orders.


Q: How long is the delivery time?

A: 7-15 days for standard sizes in stock after payment confirmation. For custom orders, delivery time is typically 20-30 days, depending on quantity and specifications. We will confirm the exact timeline upon order confirmation.


Q: How do you control quality?

A: We implement 3-stage quality control:

  • Raw material– chemical composition tested by spectrometer
  • Production– dimensional checks during manufacturing
  • Final– 100% thread gauging (Go/No-Go), hardness testing, and proof load testing per ISO 898-2

A Mill Test Certificate (EN 10204 Type 3.1)is provided with every shipment.


Q: Can I get samples before ordering?

A: Yes. Stock samples are free of charge, you only pay the shipping cost. Custom samples require a small production fee, which will be deducted from your first bulk order.


Q: Do you accept OEM or custom orders?

A: Yes, we accept custom orders based on your drawings, specifications, or samples. We can also print your logo on products and packaging. Our engineering team provides a solution within 24 hours.


Q: Which standards do your products comply with?

A: Our carbon steel nuts are manufactured per:

  • ISO 898-2 – Mechanical properties

  • DIN 934 / ISO 4032 – Dimensions (metric)

  • ASME B18.2.2 – Dimensions (inch)

  • ASTM A563 – Carbon steel nut specification (US market)

Our factory is ISO9001 certified and SGS audited annually.


MESSAGE

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