ASTM A193 UNS S31703 SS 317L Hex Bolts:

ASTM A193 UNS S31703 SS 317L Hex Bolts, threaded fasteners are designed for demanding industrial service.
They offer strong resistance to corrosion and chemical attack.
The grade contains higher molybdenum than SS 316L.
Therefore, SS 317L is useful in aggressive process environments.

Specification note: ASTM A193 covers stainless-steel bolting for high-temperature, high-pressure, and special-purpose applications. The exact ASTM grade, product form, class, and heat-treatment requirements should be confirmed against the applicable purchase specification.

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Key Features of ASTM A193 UNS S31703 SS 317L Hex Bolts

• UNS S31703 / SS 317L austenitic stainless steel.
• High chromium and nickel content provides corrosion resistance.
• Higher molybdenum content improves resistance to localized corrosion.
• Excellent performance in many chemical-processing environments.
• Good resistance to pitting and crevice corrosion.
• Good weldability due to low carbon content.
• Good ductility and toughness.
• Suitable for demanding industrial fastening applications.
• Studs, hex bolts, nuts, and washers can be supplied.
• Custom dimensions and special requirements can be accommodated.

SS 317L vs SS 316L

In comparison, SS 317L provides higher alloy content than SS 316L.
As a result, it can provide improved resistance in severe chemical environments.
However, SS 316L remains an economical choice for many applications.

Chemical & Mechanical properties of SS 317L grade Materials.

SS 317L Chemical and mechanical properties.

Product Range for ASTM A193 UNS S31703 SS 317L Grade.

Studs

• ASTM A193 bolting studs
• Full-thread studs
• Double-end studs
• Custom-length studs

Hex Bolts

• Hex head bolts
• Heavy hex bolts
• Full-thread bolts
• Custom-engineered bolts

Nuts

• Hex nuts
• Heavy hex nuts
• ASTM A194 compatible nut requirements, when specified
• Custom nuts

Washers

• Plain washers
• Heavy washers
• Custom thickness washers

Applications of ASTM A193 UNS S31703 SS 317L Hex Bolts

SS 317L fasteners are used in industries where corrosion resistance is important.

• Chemical processing plants
• Petrochemical plants
• Oil & gas facilities
• Pharmaceutical plants
• Pulp and paper industries
• Textile processing equipment
• Pollution-control equipment
• Flue-gas systems
• Food-processing equipment
• Heat exchangers
• Process piping
• Marine and coastal environments

ASTM A193 specifically covers bolting used with pressure vessels, valves, flanges, and fittings for high-temperature or high-pressure service. (ASTM Store)

Why Aanuraj Fasteners?

Aanuraj Fasteners specializes in stainless-steel and exotic-alloy fasteners.
Our manufacturing process focuses on dimensional accuracy and thread quality.
Furthermore, material identification and inspection can be supported with documentation.

We manufacture and supply studs, hex bolts, nuts, washers, and special fasteners.
Special sizes and lengths can also be produced according to drawings.
Therefore, customers can source multiple fastener types from one supplier.

Our strengths include:

• Stainless steel and exotic alloy expertise
• Hot forging capability
• CNC machining
• Thread rolling
• PMI and inspection support
• Material traceability
• Customized fastener manufacturing
• Quality-focused production
• Industrial and project-order support

3 Common Questions About SS 317L

1. What is UNS S31703?

UNS S31703 is the UNS designation for low-carbon SS 317L.
It is an austenitic stainless steel with high chromium, nickel, and molybdenum.

2. Is SS 317L better than SS 316L?

Generally, yes for severe corrosion service.
SS 317L contains more molybdenum and chromium than SS 316L.
Therefore, it can offer better resistance in certain aggressive environments.

3. Where are SS 317L fasteners used?

SS 317L fasteners are commonly selected for chemical, petrochemical, pharmaceutical, pulp and paper, and process industries.
They are especially useful where corrosion resistance is more important than the lowest initial cost.

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