Flange Alignment Pins
Precise, Repeatable CF Flange Alignment for Vacuum Systems
Flange Alignment Pins provide a precise, repeatable method for aligning CF flanges during assembly, maintenance, and frequent chamber access. Designed for standard 5/16‑inch through‑hole CF flanges, they are compatible with common sizes including 3.38″, 4.5″, 6″, 8″, 10″, and 12″, as well as any other flange with the same hole specification.
Each pin installs through a 5/16″ flange hole and is secured from the backside with a threaded fastener. Using at least two pins provides stable, repeatable alignment — ideal for vacuum systems where flanges are routinely removed and reinstalled.
Volume Pricing
| Quantity | Unit Price |
|---|---|
| 1 – 4 | $18.00 |
| 5 – 9 | $17.50 |
| 10 – 24 | $17.00 |
| 25+ | $16.00 |
Custom Order Inquiry
Need pins for a non-standard flange size or a specific quantity configuration? Tell us about your vacuum system and we'll help find the right solution.
Built for High-Cycle Vacuum System Maintenance
Flange Assembly
Provides precise, repeatable CF flange alignment during system assembly, eliminating guesswork and reducing the risk of cross-threading or misaligned bolt patterns.
CVD / PVD / ALD Systems
Ideal for frequent chamber access in CVD, PVD, ALD, and UHV equipment where flanges are routinely opened and reinstalled during maintenance or sample loading.
Gasket Protection
Prevents gasket damage caused by flange misalignment during closure, helping maintain leak-free vacuum seals and extending gasket service life.
Maintenance Efficiency
Reduces reassembly time significantly in research, industrial, and production environments where system downtime directly impacts throughput and productivity.
Pin Specifications
High-strength stainless steel alignment pins with rounded tapered tips, engineered for repeatable precision across hundreds of flange cycles.
| Specification | Parameter |
|---|---|
| Material | Stainless steel |
| Thread / Hole Size | 5/16″ through-hole CF flanges |
| Compatible Flange ODs | 3.38″, 4.5″, 6″, 8″, 10″, 12″ (and others with same spec) |
| Mounting Method | Through flange hole, secured from backside |
| Tip Geometry | Rounded, tapered point |
| Recommended Quantity | Minimum 2 per flange pair |
| Mechanical Properties | Wear and galling resistant |
| Use Case | Vacuum system assembly & maintenance |
Features & Gallery
1Precision Alignment
- Fits standard 5/16″ CF flange through-holes — no modification required
- Compatible with 3.38″, 4.5″, 6″, 8″, 10″, and 12″ CF flanges
- Ensures accurate, repeatable flange positioning every time
- Backside threaded fastener locks the pin firmly in place
- Two-pin minimum provides stable, non-rotational alignment
2Stainless Steel Construction
- High-strength stainless steel resists deformation under repeated use
- Excellent wear and galling resistance for long service life
- Withstands repeated mechanical loading during flange cycling
- Corrosion resistant — safe for cleanroom and lab environments
- Maintains dimensional accuracy across hundreds of uses
3Tapered Tip Design
- Rounded, tapered point guides the mating flange smoothly into position
- Reduces risk of scratching or binding flange surfaces during engagement
- Makes single-operator reassembly faster and safer
- Prevents flange from catching or skewing during closure
- Protects precision-machined sealing surfaces from contact damage
4Gasket & Seal Protection
- Prevents gasket damage caused by misalignment during flange closure
- Extends gasket service life by ensuring concentric seating every time
- Reduces leak-check failures caused by installation errors
- Critical for systems requiring leak-free, high-vacuum performance
- Particularly valuable when using expensive copper or aluminum gaskets