Stem Bolts for Bicycle Stem Seatpost M5 M6 MTB Folding Road Bike Bolts
Size：M6-M36
Manufacturing standard：ISO, GB, JIS, DIN, BS and ANSI standards, or drawings provided by customers.
Materials： iron, carbon steel, alloy steel, copper, stainless steel, plastics, high-temperature alloy, copper alloy, nickel-base alloy, high-strength alloy, corrosion-resistant alloy, etc.
Process： cold heading, punching, turning, milling, wire cutting, etc.
Treatment/Finishing: Brushing、Anodizing、Zinc Plated、Nickel Plated、Sn Plated.
Requirements： No Burrs、Scratches、Dents、Pits
Application： Structural Steel; Metal Building; Oil&Gas; Tower&Pole; Wind Energy; Mechanical Machine; Automobile: Home Decorating
Packing：bulk in cartons (25kg Max.)+wood Pallet or according to customer special demand
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Product Name
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Stem Bolts
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Size
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M8-M56 or Customized Size
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Material
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Steel,Stainless Steel,Alloy steel,Carbon Steel,Brass,Aluminum and So on
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Thread Type
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Fine Thread Or Coarse Thread or Hi-Lo Thread
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Grade
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4.8,8.8,10.9,12.9.etc
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Standard
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GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS etc
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Non-standards
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OEM is available, according to drawing or samples
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Finish
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Plain, black, zinc plated/according to your requirement
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Certification
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ISO9001,IATF16949,ISO14001
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Package
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according to customers requirement
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USE
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Automobile, aviation, new energy, high-speed rail
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Stem bolts play a critical role in ensuring structural stability and rider safety in modern cycling assemblies. Typically used to secure the handlebar stem to the fork steerer tube, these fasteners are manufactured with precision from high-strength materials such as Grade 8.8 or Grade 10.9 alloy steel. For corrosion resistance, black oxide and zinc-plated finishes are common, especially in outdoor or high-moisture conditions.
Hex socket heads (Allen head) are the most widely adopted drive type, offering compact and tamper-resistant installation. Standard sizes like M6x30mm or M8x35mm are frequently used across road bikes, mountain bikes, and BMX platforms. Accurate thread pitch and consistent torque performance are essential to prevent loosening under dynamic load.
Manufacturers and OEM suppliers prioritize ISO or DIN-compliant dimensions to ensure compatibility and interchangeability. With growing demand for lightweight performance, some variants are also available in titanium for reduced weight without compromising strength. As cycling technology advances, the importance of reliable and precisely machined stem bolts remains fundamental in both recreational and competitive use.
