Phosphor Bronze Strip

CuSn5, CuSn6 and CuSn8 phosphor bronze coil and strip. Thin gauges for the manufacture of springs and contacts, supplied from 320 mm wide stock coils or as slit strip in custom widths.

Grades and sizes

CuSn5 · CW451K

CuSn5

A wrought phosphor bronze with about 5 % tin and a small phosphorus content. It has good cold formability and develops spring properties when hardened by cold rolling. Its electrical conductivity is slightly higher than that of CuSn6 and CuSn8. Used for spring contacts, connectors, diaphragms and bent electrical parts.

INTERNATIONAL EQUIVALENTS

EN CW451K · UNS C51000 · BS PB102
Strip standards: EN 1652 · EN 1654 · ASTM B103

CuSn6 · CW452K

CuSn6

The most widely used wrought phosphor bronze, with about 6 % tin and a small phosphorus content. It offers a balanced combination of strength, spring properties, fatigue strength and formability, and resists atmospheric corrosion and marine air. Used for springs, electrical contacts and connectors, diaphragms, bushes and sliding parts.

INTERNATIONAL EQUIVALENTS

EN CW452K · DIN 2.1020 · UNS C51900 · BS PB103
Strip standards: EN 1652 · EN 1654 · ASTM B103

CuSn8 · CW453K

CuSn8

A wrought phosphor bronze with about 8 % tin and a small phosphorus content. The higher tin content gives better strength, wear resistance and sliding properties than CuSn6, at the cost of somewhat lower formability. Used for wrapped bushes and plain bearings, wear plates, highly loaded springs and contact parts.

INTERNATIONAL EQUIVALENTS

EN CW453K · DIN 2.1030 · UNS C52100 · BS PB104
Strip standards: EN 1652 · EN 1654 · ASTM B103

THICKNESS: 0.10–1.00 mm
STOCK COIL WIDTH: 320 mm
TEMPER: CuSn6 R420–R720 (EN 1654) · CuSn5 / CuSn8: EN 1652 material conditions
ORDERING: Stock coil (320 mm): minimum 5 kg. Strip narrower than 320 mm or in custom widths: lead time approx. 1 week, minimum 60 kg.

For large-quantity orders, other cut sizes are possible.

Request a quote on WhatsApp Calculate weight ↓Request technical data

Chemical composition, mechanical properties and material certificates are available on request.

Phosphor bronze strip weight calculator

Calculate the weight from the length, or the length from a given weight. Your selections are added to the quote message automatically.

GRADE

ThicknessmmWidthmmLengthm

CuSn5: calculated with a density of 8.8 g/cm³.

TOTAL THEORETICAL WEIGHT

42.24 kg

0.84 kg/m · 50.00 m

Order terms: Stock coil: minimum 5 kg; custom-width strip: minimum 60 kg (lead time approx. 1 week). This is a theoretical weight; we invoice on the actual weight as weighed.

YOUR MESSAGE

Hello, I would like a quote for Phosphor Bronze Strip (CuSn5).
Size: 0.3 × 320 mm, 50.00 m (theoretical ~42.24 kg)

Request a quote for this size on WhatsApp or send by e-mail →

For other bronze sizes, weight-per-metre tables and densities, see the Bronze weight calculator →

Applications

Springs and spring contacts
Connectors and terminals
Relay and switch parts
Membranes and diaphragms

Frequently asked questions

What are the designations for CuSn5, CuSn6 and CuSn8?

CuSn5: EN CW451K, UNS C51000, BS PB102. CuSn6: EN CW452K, DIN 2.1020, UNS C51900, BS PB103. CuSn8: EN CW453K, DIN 2.1030, UNS C52100, BS PB104. Any of these designations can be used in your enquiry; we will match the correct material.

Why can the invoiced weight differ from the calculated weight?

The calculator gives the theoretical weight. The actual weight varies with dimensional tolerances and cutting allowance; we invoice on the actual weight as weighed.

What information should I send for a quote?

We only need the grade, size (thickness × width), total weight in kg and delivery location. If you fill in the calculator above, these details are added to the WhatsApp message automatically.