Hardened SUJ2 Vented Stepped Dowel Pins, 45-50HRC Precision Air Vent Locating Pins with Pull-Out Thread for Mold & Jig Positioning, D5-D20 | sinoboltco SNDP000004

The sinoboltco SNDP000004 stepped air vent dowel pin is an industrial-grade precision locating component engineered specifically for heavy-duty mold bases, stamping dies, automotive jigs, and high-cycle automation fixtures. By utilizing premium SUJ2 bearing steel subjected to rigorous induction hardening (45-50HRC), this series guarantees exceptional shear strength and surface longevity under repeated insertion and extraction cycles.

Eliminating the Blind-Hole Piston Effect

Traditional solid dowel pins act as pistons when pressed into blind holes, compressing trapped air. This builds extreme counter-pressure that either halts full flush-seating, bulges thin mold walls, or ejects the pin post-assembly.

Our advanced design incorporates a 15-degree angled air vent chamfer at the leading edge, routed directly to a threaded rear outlet (M x P). Trapped air escapes seamlessly through the core of the pin, ensuring 100% flush seating with zero residual stress on the mating plate. Furthermore, the internal thread allows for easy extraction using standard pull-out bolts during maintenance.

Technical Data & Dimension Matrix

As detailed in our specification drawing, the SNDP000004 series covers 8 metric outer diameters with discrete, non-generalized tolerance classes to match real-world machining environments:

Note: For applications demanding non-standard total lengths (L) or specialized intermediate tolerances, Sinoboltco provides rapid custom cut-to-length and precision grinding services for bulk B2B commercial orders.

Product Advantages

Engineered Anti-Trapping Vent: Internal channel with a 15° entrance chamfer relieves high-pressure air pockets instantly during blind-hole press-fitting.

Industrial SUJ2 Bearing Steel: Through-hardened to 45-50HRC, minimizing wear, deformation, and galling under extreme lateral loads.

Dual-Purpose Extraction Thread: Rear M × P thread facilitates effortless tool-assisted removal/pull-out, cutting downtime during mold maintenance.

Micro-Metric Tolerance Segregation: Exacting tolerances graded strictly by size (e.g., +0.004mm for D6) for deterministic, ultra-repeatable positioning.

Self-Centering Stepped Nose: Optimized Dimension A step coupled with a radius tip prevents misalignment and borehole scoring during manual or robotic insertion.

Product Features

Material Composition: Authenticated SUJ2 bearing steel, heat-treated to 45-50HRC.

Vent Architecture: Internal central vent hole, 15° leading-edge chamfer, integrated rear pull-out thread (M × P).

Shank Configuration: Stepped guiding front-step (Dimension A) with a smooth rounded nose.

Standard Diameter Array: D5, D6, D8, D10, D12, D13, D16, D20.

Thread Range Matrix: M3, M4, M5, M6, M8, M10 tailored by pin diameter.

Application Fit: Plastic injection mold bases, precision metal stamping dies, CNC workholding fixtures, heavy automotive welding jigs, and automated assembly cells.

B2B Procurement Format: SNDP000004 - D - L (e.g., Ordering SNDP000004-10-45 specifies Model SNDP000004 with a 10mm OD and a 45mm total length).