Our Stainless steel heavy bolts solve vibration failures in heavy assemblies where regular fasteners shake loose. The extended barrel design (ASME B18.6.7 compliant) distributes shear forces 40% better than standard bolts - we've got third-party tests showing 650 MPa tensile strength (exceeding ISO 3506 Class 70).
With 18% chromium content (per ASTM A276), they resist salt corrosion for 200+ hours (ASTM B117 verified) - crucial for outdoor equipment or marine applications. The rolled threads maintain Class 6g fit even after 10+ assembly cycles (tested per DIN 267), unlike machined competitors that strip. You'll save 30% versus 316 SS in non-chemical environments while getting industrial-grade reliability.
We offer two finishes: Passivated (per ASTM A967) to boost corrosion resistance, creating a 5-7μm oxide layer, and plain (mill finish) for general use. The passivated bolts resist pitting 40% better than untreated ones in chloride tests.
Our threading is precise: UNC threads (ASME B1.1) have a tolerance of ±0.02mm, ensuring a tight fit with nuts. We also provide custom lengths (10mm to 300mm) with ±0.5mm tolerance, using cold heading machines that maintain thread integrity. Every bolt undergoes a torque test (ASTM F606) to ensure it meets minimum clamp load requirements.
As a Chinese manufacturer with 10 years supplying EU and US construction sectors, we run 9 cold heading lines and 6 thread rolling machines, producing 5,000 tons annually. Our raw material comes from ISO 9001-certified mills, with each batch tested via XRF to verify chromium and nickel levels (within 0.01% of ASTM specs).
We keep 600-800 tons in stock at our Shanghai warehouse, covering sizes from ½" to 2" and lengths 1" to 12". Inventory updates in real time online, and FOB Shanghai shipments for in-stock Stainless Steel Heavy Hex Bolts leave within 3 days-key for meeting urgent project deadlines.
Orders over 50 tons get a 6% discount, with 316 grade qualifying for an extra 1% off. We cover 20% of sea freight and offer free passivation on orders over 30 tons.
Our guarantee: If any Stainless steel heavy bolts fail to meet ASTM A325 tensile strength standards or shows corrosion beyond 0.01mm/year in standard tests, we'll replace them within 5 days and refund all shipping costs. We also lock prices for 45 days, with a 2% loyalty discount for repeat orders.
Specification
Chemical Composition
Cr: 18-20%, Ni: 11-15%, Mo: 3-4%, C: ≤0.03%, Mn: ≤2%, Si: ≤1%, P: ≤0.045%, S: ≤0.03%
Mechanical Properties
Mechanical Properties
≥170 MPa
≤217 HB (Brinell); ≤95 HRB (Rockwell)
Corrosion Resistance
Superior to 304/316; excellent resistance to pitting, crevice corrosion, and harsh chemicals (e.g., sulfuric acid)
Temperature Range
-270°C to 815°C (continuous service); suitable for high-temperature corrosive environments
Magnetic Property
Non-magnetic (annealed condition)
Metric Size (M)
Thread Pitch (mm)
Hex Head Width (mm)
Hex Head Height (mm)
Length Range (mm)
Imperial Equivalent
Thread Type (Imperial)
UNC (3/16"-24), UNF (3/16"-32)
UNC (5/16"-18), UNF (5/16"-24)
UNC (3/8"-16), UNF (3/8"-24)
UNC (1/2"-13), UNF (1/2"-20)
Standard Compliance
Key Features
Typical Applications
ISO 4017 (Metric)
Low carbon content (L-grade) reduces sensitization during welding
Chemical processing plants, pharmaceutical reactors, pulp/paper industry
ASME B18.2.1 (Imperial)
Enhanced molybdenum content for improved pitting resistance
Wastewater treatment, desalination plants, sulfuric acid handling equipment
Full/partial thread options; high dimensional accuracy
Offshore oil platforms, marine engineering, industrial chimneys
317L Stainless Steel
316 Stainless Steel
304 Stainless Steel
Molybdenum Content
Pitting Resistance
Chemical Resistance
Superior (acids, chlorides)
Weldability
Excellent (low carbon avoids carbide precipitation)
Frequently Asked Questions
Q: Can you print our company logo on the products?
A: Yes, we can print your logo via laser engraving or stamping, as long as you provide the design file.
Q: Do you accept small quantity orders?
A: Yes, we accept small quantity orders. Even for trial orders, we'll provide the same quality and service as bulk orders.
Q: What materials do your products mainly include?
A: Our products mainly include carbon steel, stainless steel, and alloy steel, with a focus on pipes, flanges, and fittings.
