Shoulder Screws Manufacturer
MT.BOLTS manufactures Shoulder Screws, also known as stripper bolts, which feature a cylindrical, unthreaded shoulder between the head and the threaded portion. Designed for precision alignment, rotation, and sliding applications, these fasteners are widely used in tooling, mechanical assemblies, dies, automation equipment, and motion systems. MT.BOLTS provides high-performance shoulder screws in various sizes, tolerances, and materials to meet exacting engineering requirements.
- System of Measurement:
- Metric: M3–M30 (shoulder diameters)
- Imperial: 1/8″ to 1.25″
- Length Range (Shoulder Length):
- Metric: 6 mm to 120 mm
- Imperial: 0.25″ to 5″
- Thread Pitch:
Metric (Coarse) | UNC - Head Type:
- Socket Head (most common)
- Hex Head (available for some configurations)
- Finish Options:
Plain, zinc-plated, hot-dip galvanized, black oxide, passivated, or custom coatings - Standards:
- ASME B18.3 – Inch series socket head shoulder screws
- ISO 7379 – Metric shoulder screws
- DIN 923, DIN 609 – Metric shoulder bolts
Shoulder Screws Material Types
MT.BOLTS supplies carbon steel, stainless steel, duplex steel, and nickel-based alloy Shoulder Screws , meeting the demanding requirements of chemical, marine, and high-temperature environments, compliant with various international standards.
| Material Category | Common Grades/Models | Description |
| Carbon Steel | ASTM A307, A325, A490 | High strength and cost-effective, suitable for general structures; requires anti-corrosion coating. |
| Stainless Steel | 304 (A2), 316 (A4), 321, 410 | Excellent corrosion resistance; widely used in food, chemical, and construction industries |
| Duplex Stainless Steel | UNS S31803/S32205 (F51), UNS S32750 (F53) | High strength with superior chloride corrosion resistance; used in seawater, petrochemical, and paper industries |
| Monel Alloys | Monel 400, Monel K500 | Excellent seawater corrosion resistance and mechanical strength; used in marine engineering and pump systems |
| Hastelloy Alloys | Hastelloy C276, C22, B2, X | Excellent resistance to strong acids and oxidizing media; widely used in chemical equipment and flue gas desulfurization |
| Inconel Alloys | Inconel 600, 625, 718 | Resistant to high temperature, pressure, and corrosion; used in heat exchangers, aerospace, and nuclear industries |
| Incoloy Alloys | Incoloy 800, 825, 925 | Ideal for high-temperature acidic environments; widely used in petroleum refining and heat treating systems |
| Nickel Alloys | Nickel 200, 201 | Pure or high-nickel alloys with excellent conductivity and alkali resistance; used in electronics and chemical applications |
Shoulder Screws System of Measurement
- Metric: M3 – M30 (shoulder diameter)
- Imperial: 1/8″ to 1-1/4″
- Shoulder Lengths: 6 mm to 120 mm | 0.25″ to 5″
- Thread Type: Metric (fine) / UNC/UNF
- Threaded Portion: Typically partial, located under the shoulder
Shoulder Screws Common Standards
- ASME B18.3 – Socket Head Shoulder Screws (inch)
- ISO 7379 – Hex Socket Shoulder Screws (metric)
- DIN 609 / DIN 923 – Metric precision shoulder bolts
Shoulder Screws Surface Finishes
- Zinc-plated – Corrosion resistance in indoor environments
- Hot-dip galvanized – Excellent protection in outdoor/marine use
- Black oxide – Mild corrosion resistance, often for aesthetic or indoor use
- Passivated – Used on stainless steel bolts to improve corrosion resistance
- Custom Coatings (e.g., PTFE) – Non-stick, chemical-resistant for harsh environments
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Benefits and Limitations of Shoulder Screws
Advantages
- Precision alignment for moving parts and pivot points
- Smooth, wear-resistant shoulder surface for sliding or rotating components
- Can act as dowels, axles, or guides
- Clean and uniform appearance
Disadvantages
- More expensive than standard screws
- Requires precise hole sizing for the shoulder to function properly
- Limited load capacity compared to full-thread fasteners
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Shoulder Screws Applications
- Dies and mold tooling
- Robotic joints and linkages
- Mechanical assemblies requiring sliding/pivoting
- Automotive and aerospace jigs and fixtures
- Punch and die stripper applications
- Furniture and cabinetry with moving joints
FAQ About Shoulder Screws
It's designed for applications where a part must slide, rotate, or be precisely spaced using the unthreaded shoulder.
Yes, especially in light-duty rotating assemblies where alignment is critical.
Shoulder screws have a smooth, unthreaded section (the shoulder) for precision alignment or movement, unlike fully threaded screws.
They are typically installed using a hex key and need accurate hole sizing for both the threaded section and the shoulder fit.
Alloy steel, stainless steel (304/316), and sometimes brass or titanium for specialized needs.
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