Supertech 5mm (5.0mm) 7 Degree Valve Keeper/Collet/Lock KPR-5.0/7S - Single Groove Split Cotter for BMW N54, Ford 1.5/1.6 (ST SE Turbo), Vauxhall/Opel A18XER Z16LER Z18XER - Valve Stem Lock Retainer Wedges

Precision 5.0 mm 7 degree valve cotters for BMW, Ford and Vauxhall or Opel engines

Built for reliability in hard‑worked performance builds and everyday road cars, these Supertech valve lock halves give rock‑solid valve stem retention under high RPM, boost and track day abuse. Part number KPR-5.0/7S is the proven 5.0 mm single groove wedge that enthusiasts and engine builders trust for BMW N54, Ford 1.5 and 1.6 four‑cyl applications, plus Vauxhall or Opel A18XER, Z16LER and Z18XER powerplants.

Also known as valve cotters, wedges, collet halves or spring lock halves, this 7 degree single slot design delivers consistent clamping on 5.0 mm stems for a stable valvetrain at sustained high engine speeds. We run these in our own builds at MJ Modifications and our customers rate the fit, finish and durability.

Why enthusiasts choose this 5.0 mm 7 degree lock

• Single groove 7 degree interface for repeatable, precise stem grip
• Made to exacting tolerances for dependable valve control at high RPM
• Ideal for head refreshes, cam and spring upgrades, turbo builds and track cars
• Works with compatible Supertech retainers and springs using 5.0 mm stems
• Reliable choice for tuned and remapped set‑ups seeking longevity

Part details

• Manufacturer: Supertech
• Part number: KPR-5.0/7S
• Type: 7 degree single groove keeper or collet half
• Sold individually, order the quantity required
• Guide: 2 halves per valve, typical 16‑valve head uses 32 pieces

Confirmed engine applications using 5.0 mm single groove locks

• BMW 3.0 turbo N54B30A
• Ford 4‑cyl 1.6 Base
• Ford 4‑cyl 1.6 S
• Ford 4‑cyl 1.6 SE
• Ford 4‑cyl 1.6 SE Turbo
• Ford 4‑cyl 1.5 SE Turbo
• Ford 4‑cyl 1.6 SEL
• Ford 4‑cyl 1.6 SES
• Ford 4‑cyl 1.6 ST Turbo
• Ford 4‑cyl 1.6 Titanium
• Opel or Vauxhall A18XER 1.8
• Opel or Vauxhall Z16LER 1.6
• Opel or Vauxhall Z18XER 1.8

Fitting and support

Professional fitting is recommended. MJ Modifications offers installation and cylinder head services in Warwickshire. For a fitting or build quote, email info@mjmodifications.co.uk.

Always confirm your cylinder head uses 5.0 mm valve stems and a 7 degree single groove arrangement. If pairing with aftermarket springs and retainers, check component compatibility before purchase.

What you receive

1 x Supertech 5.0 mm 7 degree single groove valve lock half

Also searched as

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Why buy from MJ Modifications

Performance parts specialists with hands‑on build experience. We use these Supertech locks in our own engines and customer projects, with excellent feedback on fitment and long‑term reliability. Order KPR-5.0/7S with confidence and get expert advice when you need it.