Selection Guides

January 19, 2026

P-Clip Sizing Chart: All Standard Diameters and Fixing Holes

Complete P-clip sizing chart covering all standard diameters from 5 mm to 90 mm, fixing hole sizes, band widths, and how to match clip to cable or pipe OD.

This page gives you the complete size reference for our British-made rubber-lined P-clips — from 5 mm up to 90 mm nominal diameter, across both our standard and heavy-duty ranges. Use the tables below to match your cable or pipe outer diameter to the correct clip, band width, and fixing hole.

How to Read This Chart

The nominal diameter is the internal diameter of the clip at full closure — it should match or fractionally exceed the outer diameter (OD) of the item being secured. The band width is the height of the metal band. The fixing hole is the bolt size the clip is designed for.

Sizing rule If your pipe or cable OD falls between two sizes in the chart, always select the next size up. A clip that is slightly oversized will still close; one that is undersized will not. See our full guide on how to choose the right P-clip size.

Standard P-Clip Size Chart

Our standard P-clips cover the majority of cable, pipe, and hose applications in automotive, HVAC, marine, and general industrial use. All are EPDM rubber-lined and available in zinc-coated mild steel and stainless steel.

Nominal Ø (mm)	Band Width (mm)	Fixing Hole	Typical Application
5	12	M4/M5	Small cable looms, instrument wiring
6	12	M4/M5	Small cable looms, instrument wiring
8	12	M4/M5	Automotive body loom, brake lines
10	12	M6	General cable management, small bore hose
12	12	M6	Hydraulic pilot lines, fuel hose
15	12	M6	Copper pipe (15 mm), general hose
16	12	M6	Copper pipe, flexible conduit
19	12	M6	3/4" hose, compressed air lines
22	12	M6	22 mm copper pipe, HVAC
25	12	M6	1" hose, general pipework
28	12	M6	28 mm copper pipe
30	12	M6	General industrial hose
32	12	M8	1.25" hose, HVAC ducting
35	12	M8	General pipework, cable bundles
38	12	M8	1.5" hose, compressed air

Heavy-Duty P-Clip Size Chart

Our heavy-duty P-clips use a wider, thicker band for applications with larger diameters, higher loads, or sustained vibration. They are the correct specification for hydraulic hoses, industrial pipework, and off-road or rail installations. For a full breakdown of when to specify heavy-duty over standard, see our standard vs heavy-duty guide.

Nominal Ø (mm)	Band Width (mm)	Fixing Hole	Typical Application
12.7	19–20	M10	Hydraulic pilot lines, high-pressure hose
15.7	19–20	M10	Medium hydraulic hose
21	19–20	M10	Hydraulic return lines
24	19–20	M10	Industrial hose, off-road vehicle
33.3	19–20	M10	Large hydraulic hose, rail applications
34.8	19–20	M10	Industrial hose bundles
38	19–25	M10	1.5" high-pressure hose
44.5	19–25	M10	Large bore hydraulic hose
50.8	25	M12/M14	2" hose, major industrial pipework
53.9	25	M12/M14	Large bore industrial hose
57	25	M12/M14	Large bore hose, structural runs
63.5	25	M12/M14	2.5" hose
70	25	M12/M14	Very large bore hose, industrial
90.4	25	M12/M14	Largest industrial pipework runs

Fixing Hole Reference

If you already know your fixing hole requirement, use these links to go directly to the filtered range:

M4 / M5

Small-diameter clips, light-duty, automotive body panels and instrument panels.

M6

The most common size. General-purpose across standard range 10–38 mm.

M8

Higher-load applications, larger diameters in the standard range.

M10

Heavy-duty range, off-road, rail, and marine mounting points.

M12 / M14

Structural fixing points and the largest heavy-duty diameters.

How to Measure Your Cable or Pipe

Use digital vernier calipers across the widest point of the item being secured — including any insulation, sleeving, or protective jacketing. Do not measure the inner bore or conductor. The resulting measurement is your target nominal diameter. If your measurement doesn't correspond exactly to a size in the chart above, round up to the next available size.

For detailed guidance including common mistakes and borderline-size decisions, see our complete guide: How to Choose the Right P-Clip Size.

Next Steps

Once you have your nominal diameter, band width, and fixing hole confirmed:

Choose zinc-coated mild steel for indoor and general industrial applications
Choose stainless steel for marine, food processing, or chemically aggressive environments
Browse the full shop and use the filters to narrow down by size, material, and fixing hole

FAQs

What does the nominal diameter on a P-clip mean?

The nominal diameter is the internal diameter of the clip at the point of full closure — it corresponds to the outer diameter of the cable, pipe, or hose the clip is designed to secure.

Are P-clip sizes standardised across manufacturers?

Common sizes broadly follow DIN 3016, but not all manufacturers stock every size, and band widths and fixing hole sizes vary. Always check the specific product data for the clips you are ordering.

What if my pipe diameter falls between two standard clip sizes?

Always size up, never down. A clip that is slightly too large will still close and distribute load, though clamping force is reduced. A clip that is too small will not close properly and will fail to secure the item.

Can I use one clip size for a range of pipe diameters?

No. The EPDM liner provides a small amount of compliance (typically 0.5–1 mm), but beyond that the clip will not close correctly. Each clip is designed for one nominal diameter.

Find Your Clip

Filter our full range by diameter, material, and fixing hole — all British-made and in stock.

Browse All P-Clips