Why leader pins matter
Leader pins — also called guide pins — keep the two mold halves aligned as the press closes. If the halves shift, you get parting-line mismatch, uneven wear, and parts that come out out-of-tolerance. The leader pin and its bushing are the first thing to check when a mold starts producing inconsistent parts.
What to look for in a leader pin
- Case-hardened steel: A hard, wear-resistant surface (typically 58-62 HRC) over a tough core that resists bending under the closing load.
- Ground finish: The pin body must be precision-ground so it slides in the bushing without binding or galling.
- Head style: The head seats in the plate and carries the closing load; match the head diameter and thickness to your plate.
- Length: The pin must engage the bushing before the mold halves meet, and stay engaged through the full stroke.
PCS F.I.T.S. leader pins
PCS Company makes F.I.T.S. leader pins for use with F.I.T.S. insert assemblies. They are manufactured from case-hardened steel with a surface hardness of 58-62 HRC, and are available in a range of diameters and lengths — for example, the FL-50-17 designation identifies a 1/2-inch nominal pin at a specific overall length. Matching F.I.T.S. shoulder bushings complete the alignment set.
Sizing checklist
- Measure the pin body diameter and the bore it runs in.
- Confirm the head diameter and thickness seat correctly in the plate.
- Verify the pin length engages the bushing before the mold halves contact.
- Match the leader pin to its bushing — they are designed as a set.
Catalog item plug: Tooling Components sells leader pins from PCS and Progressive Components, case hardened to 58-62 HRC and ground for smooth travel — sized by diameter and length for your mold base. Call (814) 438-7657 or email sales@toolingcomponent.com for same-day pricing.