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.
→Product Introduction
A nut is an internally threaded fastener, designed to mate with a matching externally threaded bolt or screw.
When assembled, the nut and bolt form a clamp load that securely fastens the connected components.
The threaded engagement generates axial preload, providing a reliable and detachable joint that can withstand specified tensile and shear forces.
Performance Grades & Material Selection
Nut Types & Dimensional Standards
Size Range & Dimensions
Mechanical Properties
FAQ
Q1: What are the main products you can supply?
A: We are a professional manufacturer and supplier in China for stainless steel fasteners and pipe fittings, including stainless steel nuts, bolts, flanges, elbows, and other threaded products. Our stainless steel fasteners are widely used in corrosive environments, food processing, marine, and chemical industries.
Q2: What is the difference between A2-70 and A4-80 stainless steel nuts?
A: A2-70 is made from 304 stainless steel, offering good corrosion resistance for general industrial and food processing applications. A4-80 is made from 316 stainless steel with molybdenum added, providing superior corrosion resistance, especially against chlorides and marine environments. A4-80 also offers higher strength (800 MPa vs 700 MPa for A2-70).
Q3: What nut grades match A2-70 and A4-80 bolts?
A: A2-70 nuts should be paired with A2-70 bolts. A4-80 nuts should be paired with A4-80 bolts. As a general rule, the nut strength grade should be equal to or higher than the mating bolt. Using a lower-grade nut with a higher-grade bolt is not recommended, as it risks thread stripping under load.
Q4: What is your minimum order quantity (MOQ)?
A: For trial orders, our MOQ is 100 pcs per size. For bulk orders, MOQ is flexible — please contact us with your target quantity for a competitive quote. Volume discounts are available for large orders.
Q5: 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, grade, and specifications. We will confirm the exact timeline upon order confirmation.
Q6: How do you control quality?
A: We implement strict 3-stage quality control:
Raw material – chemical composition verified by spectrometer per grade requirements (304 / 316 / 316L)
Production – dimensional checks during forming and threading
Final – 100% thread gauging (Go/No-Go), hardness testing, and proof load testing per ISO 3506-2
A Mill Test Certificate (EN 10204 Type 3.1) is provided with every shipment, including chemical analysis and mechanical test results.
Q7: 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.
Q8: 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 will review your requirements and provide a solution within 24 hours.
Q9: Which standards do your products comply with?
A: Our stainless steel nuts are manufactured per:
ISO 3506-2 – Mechanical properties for stainless steel nuts
DIN 934 / ISO 4032 – Dimensions for hex nuts (metric)
ASME B18.2.2 – Dimensions for hex nuts (inch)
ASTM F594 – Stainless steel nuts specification (US market)
GB/T 3098.15 – Mechanical properties (Chinese standard)
Our factory is ISO 9001:2015 certified and SGS audited annually.
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