Dowel Pins

Dowel pins are high-precision cylindrical fasteners used primarily for precise positioning, fixing, or centering between two or more components. They do not rely on threaded connections, but are inserted into holes through interference fits, transition fits, and clearance fits. They are made of metal, plastic, or wood. Dowel pins are often used in conjunction with screws. They absorb shear loads and increase connection strength.

51fasteners is a one-stop supplier of cylindrical dowel pins. We offer standard metric and imperial fasteners, including bolts, screws, nuts, washers, and more. We also support custom fasteners in various materials and sizes. If you’re looking for a reliable fastener exporter, please contact us.

Features of Cylindrical Dowel Pins

Diagram of Dowel Pins

Specifications

Size	Φ0.8 to Φ50 (or custom).
Standard	DIN, ISO, JIS, PN, ASME, NF or As requested.
Material	Stainless steel, carbon steel, alloy steel, tool steel, brass, wood.
Surface treatment	White blue zinc, color zinc, oxidized black, dacromet, nickel plating, zinc plating, anodize, bead blasted, silk screen, pvd plating, chrome/titanium plating, brushing, painting, powder coated, passivation, electrophoresis, electro polishing, knurl, laser/etch/engrave etc.
Heat treatment	High frequency quenching, vacuum heat treatment, quenching and tempering treatment.
Strength	Grade 4.8, 6.8, 8.8, 10.9, 12.9 ; A2-50, A2-70, A2-80, A4-70, A4-80.
OEM	Supported.
Lead time	Sampling: 3-5 workdays Normal making: 5-10 workdays Complex design/making: 10-18 workdays
Fitting method	H7/s6, H7/k6, H7/m6, H7/H6, H7/G6.
Packaging	Plastic bag, plastic box, carton, wooden case, pallet or customized package.
Order process	Customer inquiries → Provide Spec./CAD/3D drawing → Engineer check and quote → Offer PI → Customer Send PO → 50% advanced payment(100% for First time cooperation) → Factory production process → QC passed → Packing and deliver at the first time → Ship to customers

How to Choose the Dowel Pin Fitting Method?

Between the hole and the shaft:

There is relative movement (rotation or movement): clearance fit.

No relative movement: transmits large torque, cannot be disassembled → interference fit; high positioning accuracy requirements, adds keys to transmit torque, needs to be disassembled → transition fit; adds keys to transmit torque, frequently disassembled → clearance fit.

Dowel Pin Materials

• Alloy steel: Strong, high tensile strength, excellent wear resistance, fatigue resistance, and anti-galling properties.
• Stainless steel: Strong, corrosion resistant, heat resistant. SUS303, SUS304, SS316, SS316L, 17-4PH, etc.
• Surface-hardened carbon steel: Less brittle than carbon steel, does not break under high stress.
• Nylon: Lightweight, non-conductive, impact resistant, wear resistant, corrosion resistant.
• Wooden dowel pins: Available in grooved and spiral styles, suitable for furniture structure reinforcement.
• Brass: 260, C360, H59, H60, H62, H63, H65, H68, H70, Bronze, Copper.
• Titanium: GradeF1-F5.
• Plastic: Acetal/POM/PA/Nylon/PC/PMMA/PVC/PU/Acrylic/ABS/PTFE/PEEK etc.
• Aluminum: 2000 series, 6000 series(6061/6063), 7075, 5052, etc.

✅ Main Uses of Dowel Pins:

1. Mold manufacturing: Precise alignment of upper and lower molds.
2. Automotive industry: Positioning of engine blocks and cylinder heads.
3. Aerospace: High-precision assembly of structural components.
4. Electronic devices: Alignment of housings and internal components.

Standards

DIN 7	ISO 8733	ISO 8735	ISO 8734	ASME/ANSI B18.8.7M	KS B1320
DIN 6325	ISO 2340	UNI 6364A	EN 28735	PN 85021	UNI 1707
ISO 2338	DIN 7979	NF E25-756	EN 22338	PN 85018	JIS B 1359
NF E25-751	NF E25-753	NF E25-757	EN 22340	JIS B 1355	JIS B 1354
ASME/ANSI B18.8.2	NF E25-755	ASME/ANSI B18.8.5M	EN 28734

Note: Diameter: From Ø1 mm to Ø20 mm (or custom); Length: From 3 mm to 120 mm (or custom).

Dowel Pin Types