NF E 25-514 Washer

AFNOR Flat Washer, Grade A

Series Z · M · L · LL · M1.6 to M36 · SS 304 & SS 316

The NF E 25-514 washer is a plain round flat washer made to the French AFNOR standard NF E 25-514, in product grade A, the precision grade. It sits under a bolt head or nut to spread the clamping load, protect the surface and bridge slotted or oversize holes. For each thread size the standard defines one bore and one thickness, and up to four outer diameters, called series Z, M, L and LL, from narrow to extra large. That makes it easy to choose exactly how much bearing area a joint needs. Excel Trading Corporation supplies NF E 25-514 washers in SS 304 and SS 316 stainless steel.

Specifications

Standard

NF E 25-514 (AFNOR, France)

Product Grade

Grade A (precision grade)

Series

Z (narrow) · M (medium) · L (large) · LL (extra large)

Thread Range

M1.6 to M36

Z and L: M1.6 to M30 · M: M1.6 to M36 · LL: M3 to M30

Materials

SS 304 (A2) · SS 316 (A4)

Dimensions

Inner diameter d1 · Outer diameter d2 · Thickness s

Full tables below

NF E 25-514 washer, AFNOR flat washer grade A in stainless steel SS 304 and SS 316 - Excel Trading Corporation India

Available In

SS 304 (A2)

General use

SS 316 (A4)

Marine & chemical

Four Series: Z, M, L and LL

For every thread size the bore and the thickness stay the same; only the outer diameter changes with the series. The rings below show an M8 washer in each series, drawn to scale.

Narrow

Example: M8: 8.4 × 16 × 1.5 mm

The slimmest outer diameter, for tight spaces, small heads and close-pitched bolt patterns.

Medium

Example: M8: 8.4 × 18 × 1.5 mm

The everyday general-purpose series, a good match for standard hex bolts and nuts.

Large

Example: M8: 8.4 × 22 × 1.5 mm

A wider bearing face for sheet metal, slotted holes and softer materials.

Extra Large

Example: M8: 8.4 × 30 × 1.5 mm

The widest series, spreading load over thin sheet, plastics, wood and oversize holes.

Dimension Tables

Nominal dimensions of NF E 25-514 washers for each series. Pick a series to see its full table. The bore (d1) and thickness (s) are the same in every series for a given thread; the outer diameter (d2) is what changes.

NF E 25-514 · Series Z (Narrow)

Thread	Inner Dia d1 (mm)	Outer Dia d2 (mm)	Thickness s (mm)
M1.6	1.7	3.5	0.5
M2	2.2	4	0.5
M2.5	2.7	5	0.5
M3	3.2	6	0.8
M4	4.3	8	0.8
M5	5.3	10	1
M6	6.4	12	1.2
M7	7.4	14	1.5
M8	8.4	16	1.5
M10	10.5	20	2
M12	13	24	2.5
M14	15	27	2.5
M16	17	30	3
M18	19	32	3
M20	21	36	3
M22	23	40	3
M24	25	45	4
M27	28	48	4
M30	31	52	4

NF E 25-514 · Series M (Medium)

Thread	Inner Dia d1 (mm)	Outer Dia d2 (mm)	Thickness s (mm)
M1.6	1.7	5	0.5
M2	2.2	5.5	0.5
M2.5	2.7	7	0.5
M3	3.2	8	0.8
M4	4.3	10	0.8
M5	5.3	12	1
M6	6.4	14	1.2
M7	7.4	16	1.5
M8	8.4	18	1.5
M10	10.5	22	2
M12	13	27	2.5
M14	15	30	2.5
M16	17	32	3
M18	19	36	3
M20	21	40	3
M22	23	45	3
M24	25	50	4
M27	28	55	4
M30	31	60	4
M33	34	65	5
M36	37	70	5

NF E 25-514 · Series L (Large)

Thread	Inner Dia d1 (mm)	Outer Dia d2 (mm)	Thickness s (mm)
M1.6	1.7	6	0.5
M2	2.2	7	0.5
M2.5	2.7	10	0.5
M3	3.2	12	0.8
M4	4.3	14	0.8
M5	5.3	16	1
M6	6.4	18	1.2
M7	7.4	20	1.5
M8	8.4	22	1.5
M10	10.5	27	2
M12	13	32	2.5
M14	15	36	2.5
M16	17	40	3
M18	19	45	3
M20	21	50	3
M22	23	55	3
M24	25	60	4
M27	28	65	4
M30	31	70	4

NF E 25-514 · Series LL (Extra Large)

Thread	Inner Dia d1 (mm)	Outer Dia d2 (mm)	Thickness s (mm)
M3	3.2	14	0.8
M4	4.3	16	0.8
M5	5.3	20	1
M6	6.4	24	1.2
M7	7.4	27	1.5
M8	8.4	30	1.5
M10	10.5	36	2
M12	13	40	2.5
M14	15	45	2.5
M16	17	50	3
M18	19	55	3
M20	21	60	3
M22	23	65	3
M24	25	70	4
M27	28	75	4
M30	31	80	4

Nominal dimensions in millimetres. Tell us the thread and series you need when you enquire.

Grade C or Grade A?

NF E 25-514 · Grade A (this page)

Precision grade · Mechanical assemblies

✓Closer dimensional tolerances for precise, repeatable assemblies
✓Preferred for machinery, instruments and mechanical joints
✓Same four series and nominal sizes as grade C

NF E 25-513 · Grade C

Commercial grade · General fastening

✓General-purpose grade for structural and sheet metal work
✓Economical where close tolerances are not needed

View NF E 25-513 washers →

NF E 25-514 and NF E 25-513 share the same nominal dimensions for each series. The difference is the product grade, so choose the one your drawing or customer specifies.

Where Is It Used?

Click an industry to see how these washers are used.

SS 304 or SS 316 — Which to Choose?

SS 304 (A2)

General purpose stainless

✓Good corrosion resistance indoors and in normal outdoor conditions
✓The standard choice for panels, enclosures, machinery and sheet metal work
✓Pairs with A2 stainless bolts and nuts

SS 316 (A4)

Molybdenum-alloyed stainless

✓Higher resistance to chlorides, salt spray and chemicals
✓Preferred for marine, coastal, food, pharma and chemical plants
✓Pairs with A4 stainless bolts and nuts

Quick Reference

4 Series

Z · M · L · LL

M1.6–M36

Thread Range

Grade A

Product Grade

SS 304 · 316

Materials

Selection & Fitting Tips

▸ Choose the series by the bearing surface: Z or M under standard heads on solid metal, L or LL on thin sheet, soft materials and slotted or oversize holes.
▸ Match the washer to the fastener material: SS 304 (A2) washers with A2 bolts, SS 316 (A4) with A4, to avoid galvanic corrosion.
▸ Place the washer under the part that turns during tightening, usually the nut, so the bearing surface is protected.
▸ On drawings and orders, state the standard, thread and series together, for example "Washer NF E 25-514, M8, series L, SS 304".
▸ Check that the outer diameter clears nearby edges, flanges and fillets, especially with the L and LL series.

Frequently Asked Questions

What is an NF E 25-514 washer?

An NF E 25-514 washer is a plain round flat washer made to the French AFNOR standard NF E 25-514, in product grade A, the precision grade. It is placed under a bolt head or nut to spread the clamping load, protect the surface and bridge slotted or oversize holes. The standard covers four series, Z, M, L and LL, with the same bore and thickness for each thread size and different outer diameters. Excel Trading Corporation supplies NF E 25-514 washers in SS 304 and SS 316 stainless steel.

What does product grade A mean on a washer?

Product grade describes how closely a washer is made to its nominal dimensions. Grade A is the precision grade, with closer tolerances on the bore, outer diameter and thickness, which gives more consistent fit and clamping in mechanical assemblies. Grade C is the commercial grade with wider tolerances, used for general fastening. NF E 25-514 washers are grade A, while NF E 25-513 washers are grade C with the same nominal sizes.

What is the difference between NF E 25-514 and NF E 25-513?

Both are French AFNOR standards for plain flat washers with the same four series (Z, M, L and LL) and the same nominal dimensions. NF E 25-514 is product grade A, the precision grade, and NF E 25-513 is product grade C, the commercial grade. Choose NF E 25-514 for machinery, instruments and precision assemblies, or whenever your drawing calls for it, and NF E 25-513 for general structural, sheet metal and panel work.

What are series Z, M, L and LL in NF E 25-514?

The series letter sets the outer diameter. Z is the narrow series, M the medium series, L the large series and LL the extra-large series. For a given thread, all four share the same inner diameter and thickness, so only the bearing area changes. An M10 washer, for example, has a 10.5 mm bore and 2 mm thickness in every series, with an outer diameter of 20 mm in Z, 22 mm in M, 27 mm in L and 36 mm in LL.

Is NF E 25-514 still a valid standard?

AFNOR has withdrawn NF E 25-514 in favour of the NF EN ISO plain washer standards. Even so, many French and European drawings, catalogues and specifications still call up washers as NF E 25-514 with a series letter, and parts are still ordered that way. Supplying washers to the NF E 25-514 dimensions keeps the assembly exactly as the drawing intends.

How do I specify an NF E 25-514 washer when ordering?

Give the standard, the thread size, the series and the material, for example "Washer NF E 25-514, M8, series L, SS 316". That washer measures 8.4 × 22 × 1.5 mm (inner diameter × outer diameter × thickness). Always include the series letter Z, M, L or LL, because it is what fixes the outer diameter.

Should I choose SS 304 or SS 316 NF E 25-514 washers?

SS 304 (A2) suits most indoor and normal outdoor uses, such as panels, enclosures and machinery. SS 316 (A4) contains molybdenum for better resistance to chlorides, salt spray and chemicals, so it is preferred in marine, coastal, food, pharmaceutical and chemical environments. Match the washer to the bolt material, A2 with A2 and A4 with A4, to avoid galvanic corrosion between different metals.

Where can I buy NF E 25-514 washers in Bangalore or India?

Excel Trading Corporation supplies NF E 25-514 AFNOR flat washers, grade A, in series Z, M, L and LL, in SS 304 and SS 316, from Bengaluru to customers across India. Use the Request a Quote button on this page, call +91 7204435253 or email info@exceltrading.in with the thread size, series, material and quantity you need.