Products Description

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.

Factory Processing

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.

Production Strength

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.

Factory Commitments

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.

Material Properties

Property	Specification
Material	304/316
Chemical Composition	Cr: 18-20%, Ni: 11-15%, Mo: 3-4%, C: ≤0.03%, Mn: ≤2%, Si: ≤1%, P: ≤0.045%, S: ≤0.03%
Tensile Strength	≥650MPa
Yield Strength	≥170 MPa
Hardness	≤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)

Dimensions (Metric & Imperial)

Metric Size (M)	Thread Pitch (mm)	Hex Head Width (mm)	Hex Head Height (mm)	Length Range (mm)	Imperial Equivalent	Thread Type (Imperial)
M6	1.0	10	5.2	12-200	3/16"	UNC (3/16"-24), UNF (3/16"-32)
M8	1.25	13	6.8	16-300	5/16"	UNC (5/16"-18), UNF (5/16"-24)
M10	1.5	16	8.4	20-400	3/8"	UNC (3/8"-16), UNF (3/8"-24)
M12	1.75	18	10.8	25-500	1/2"	UNC (1/2"-13), UNF (1/2"-20)

Standards & Key Features

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
DIN 933	Full/partial thread options; high dimensional accuracy	Offshore oil platforms, marine engineering, industrial chimneys

Performance vs 304/316 Hex Bolts

Property	317L Stainless Steel	316 Stainless Steel	304 Stainless Steel
Molybdenum Content	3-4%	2-3%	0%
Pitting Resistance	Excellent	Good	Moderate
Chemical Resistance	Superior (acids, chlorides)	Good	Limited
Cost	Higher	Moderate	Lower
Weldability	Excellent (low carbon avoids carbide precipitation)	Good	Good