★ Hero product
Overview
Self-loosening is one of the most common causes of failure in machines and plants. Vibration and transverse loads overcome the natural friction in a thread, and spring washers, toothed washers and nylon nuts often cannot stop it. HEICO-LOCK® Wedge Lock Washers solve this with geometry instead of friction.
Each pair has radial teeth on the outer faces and wedge-shaped cams on the inner faces. When the bolt is tightened, the hardened teeth bite into the bolt head (or nut) and the joint surface. Any later movement can only happen between the cams. Because the cam angle is steeper than the thread pitch, the washers spread apart faster than the bolt can unwind: the bolt is stretched, the clamp load rises and the joint locks itself.
The system is certified to DIN 25201-4 and proven in vibration tests to DIN 65151, NASM 1312-7 and ISO 16130. It works at low and high preload, with lubricated bolts, and with property classes 8.8, 10.9 and 12.9. Pairs are supplied bonded together, so they cannot be fitted the wrong way round, and they can be re-used.
We supply four materials: zinc-flake-coated steel for general use, 316L stainless for corrosive media, 254 SMO® for sea water and chlorides, and Alloy 718 for temperatures up to 700 °C. Each comes with a narrow (HLS) or wide (HLB) bearing face.
Specifications
| Brand | HEICO-LOCK® (HEICO Befestigungstechnik GmbH, Ense, Germany) |
|---|---|
| Metric sizes | M3 to M76 |
| Inch sizes | #5 to 3″ (UNC) |
| Types | HLS narrow bearing face; HLB wide bearing face |
| Materials | Steel 1.1191 zinc flake coated; stainless 1.4404 (A4); 254 SMO® 1.4547; Alloy 718 2.4668 |
| Hardness | Steel 485 ± 25 HV0.3; stainless > 520 HV0.1 |
| Corrosion protection (steel) | Zinc flake flZnnc, 720 h salt spray (ISO 10683) |
| Temperature | Steel −40 to 200 °C; stainless / 254 SMO® −200 to 500 °C; Alloy 718 up to 700 °C |
| Bolt classes | 8.8, 10.9, 12.9; A2-70, A4-80 |
| Certification | DIN 25201-4; tested DIN 65151, NASM 1312-7, ISO 16130; selected sizes ETA approved |
| Supply | Pre-assembled (bonded) pairs, box qty 200 down to 1 pair |
| Special sizes / materials | On request |
| Supplied by | Kantilal & Brothers, authorised HEICO distributor |
Sizes and item numbers
Steel, narrow bearing face (HLS) · 35 sizes
| M | UNC | Steel Item No. | Inner Ø d (mm) | Outer Ø D (mm) | Box qty (pairs) |
|---|---|---|---|---|---|
| M3 | #5 | HLS-3 | 3.4 | 7.0 | 200 |
| M3.5 | #6 | HLS-3.5 | 3.9 | 7.6 | 200 |
| M4 | #8 | HLS-4 | 4.4 | 7.6 | 200 |
| M5* | #10 | HLS-5 | 5.4 | 9.0 | 200 |
| M6* | — | HLS-6 | 6.5 | 10.8 | 200 |
| — | 1/4″ | HLS-1/4″ | 7.2 | 11.5 | 200 |
| M8* | 5/16″ | HLS-8 | 8.6 | 13.5 | 200 |
| — | 3/8″ | HLS-3/8″ | 10.3 | 16.0 | 200 |
| M10* | — | HLS-10 | 10.7 | 16.6 | 200 |
| M11 | 7/16″ | HLS-11 | 11.4 | 18.5 | 200 |
| M12* | — | HLS-12 | 13.0 | 19.5 | 200 |
| — | 1/2″ | HLS-1/2″ | 13.5 | 19.5 | 200 |
| M14* | 9/16″ | HLS-14 | 15.2 | 23.0 | 100 |
| M16* | 5/8″ | HLS-16 | 17.0 | 25.4 | 100 |
| M18 | — | HLS-18 | 19.5 | 29.0 | 100 |
| — | 3/4″ | HLS-3/4″ | 20.0 | 30.7 | 100 |
| M20* | — | HLS-20 | 21.4 | 30.7 | 100 |
| M22* | 7/8″ | HLS-22 | 23.4 | 34.5 | 100 |
| M24* | — | HLS-24 | 25.3 | 39.0 | 100 |
| — | 1″ | HLS-1″ | 27.9 | 39.0 | 100 |
| M27* | — | HLS-27 | 28.4 | 42.0 | 50 |
| M30* | 1 1/8″ | HLS-30 | 31.4 | 47.0 | 50 |
| M33* | 1 1/4″ | HLS-33 | 34.4 | 48.5 | 25 |
| M36* | 1 3/8″ | HLS-36 | 37.4 | 55.0 | 25 |
| M39* | 1 1/2″ | HLS-39 | 40.4 | 58.5 | 25 |
| M42 | — | HLS-42 | 43.2 | 63.0 | 25 |
| M45 | 1 3/4″ | HLS-45 | 46.2 | 70.0 | 25 |
| M48 | — | HLS-48 | 49.6 | 75.0 | 25 |
| M52 | 2″ | HLS-52 | 53.6 | 80.0 | 1 |
| M56 | 2 1/4″ | HLS-56 | 59.1 | 85.0 | 1 |
| M60 | — | HLS-60 | 63.1 | 90.0 | 1 |
| M64 | 2 1/2″ | HLS-64 | 67.1 | 95.0 | 1 |
| M68 | — | HLS-68 | 71.1 | 100.0 | 1 |
| M72 | — | HLS-72 | 75.1 | 105.0 | 1 |
| M76 | 3″ | HLS-76 | 79.1 | 110.0 | 1 |
Steel, wide bearing face (HLB) · 23 sizes
| M | UNC | Steel Item No. | Inner Ø d (mm) | Outer Ø D (mm) | Box qty (pairs) |
|---|---|---|---|---|---|
| M3.5 | #6 | HLB-3.5 | 3.9 | 9.0 | 200 |
| M4 | #8 | HLB-4 | 4.4 | 9.0 | 200 |
| M5* | #10 | HLB-5 | 5.4 | 10.8 | 200 |
| M6* | — | HLB-6 | 6.5 | 13.5 | 200 |
| — | 1/4″ | HLB-1/4″ | 7.2 | 13.5 | 200 |
| M8* | 5/16″ | HLB-8 | 8.6 | 16.6 | 200 |
| — | 3/8″ | HLB-3/8″ | 10.3 | 21.0 | 200 |
| M10* | — | HLB-10 | 10.7 | 21.0 | 200 |
| M12* | — | HLB-12 | 13.0 | 25.4 | 100 |
| — | 1/2″ | HLB-1/2″ | 13.5 | 25.4 | 100 |
| M14* | 9/16″ | HLB-14 | 15.2 | 30.7 | 100 |
| M16* | 5/8″ | HLB-16 | 17.0 | 30.7 | 100 |
| M18 | — | HLB-18 | 19.5 | 34.5 | 100 |
| — | 3/4″ | HLB-3/4″ | 20.0 | 39.0 | 100 |
| M20* | — | HLB-20 | 21.4 | 39.0 | 100 |
| M22* | 7/8″ | HLB-22 | 23.4 | 42.0 | 50 |
| M24* | — | HLB-24 | 25.3 | 48.5 | 50 |
| — | 1″ | HLB-1″ | 27.9 | 48.5 | 50 |
| M27* | — | HLB-27 | 28.4 | 48.5 | 25 |
| M30* | 1 1/8″ | HLB-30 | 31.4 | 58.5 | 25 |
| M33* | 1 1/4″ | HLB-33 | 34.4 | 58.5 | 25 |
| M36* | 1 3/8″ | HLB-36 | 37.4 | 63.0 | 25 |
| M39* | 1 1/2″ | HLB-39 | 40.4 | 75.5 | 25 |
Stainless steel A4, narrow (HLS-…S) · 34 sizes
| M | UNC | Stainless Steel Item No. | Inner Ø d (mm) | Outer Ø D (mm) | Box qty (pairs) |
|---|---|---|---|---|---|
| M3 | #5 | HLS-3S | 3.4 | 7.0 | 200 |
| M3.5 | #6 | HLS-3.5S | 3.9 | 7.6 | 200 |
| M4 | #8 | HLS-4S | 4.4 | 7.6 | 200 |
| M5 | #10 | HLS-5S | 5.4 | 9.0 | 200 |
| M6 | — | HLS-6S | 6.5 | 10.8 | 200 |
| — | 1/4″ | HLS-1/4″S | 7.2 | 11.5 | 200 |
| M8 | 5/16″ | HLS-8S | 8.6 | 13.5 | 200 |
| M10 | — | HLS-10S | 10.7 | 16.6 | 200 |
| M11 | 7/16″ | HLS-11S | 11.4 | 18.5 | 200 |
| M12 | — | HLS-12S | 13.0 | 19.5 | 200 |
| — | 1/2″ | HLS-1/2″S | 13.5 | 19.5 | 200 |
| M14 | 9/16″ | HLS-14S | 15.2 | 23.0 | 100 |
| M16 | 5/8″ | HLS-16S | 17.0 | 25.4 | 100 |
| M18 | — | HLS-18S | 19.5 | 29.0 | 100 |
| — | 3/4″ | HLS-18S | 19.5 | 29.0 | 100 |
| M20 | — | HLS-20S | 21.4 | 30.7 | 100 |
| M22 | 7/8″ | HLS-22S | 23.4 | 34.5 | 100 |
| M24 | — | HLS-24S | 25.3 | 39.0 | 100 |
| — | 1″ | HLS-1″S | 27.9 | 39.0 | 100 |
| M27 | — | HLS-27S | 28.4 | 42.0 | 50 |
| M30 | 1 1/8″ | HLS-30S | 31.4 | 47.0 | 50 |
| M33 | 1 1/4″ | HLS-33S | 34.4 | 48.5 | 25 |
| M36 | 1 3/8″ | HLS-36S | 37.4 | 55.0 | 25 |
| M39 | 1 1/2″ | HLS-39S | 40.4 | 58.5 | 25 |
| M42 | — | HLS-42S | 43.2 | 63.0 | 25 |
| M45 | 1 3/4″ | HLS-45S | 46.2 | 70.0 | 25 |
| M48 | — | HLS-48S | 49.6 | 75.0 | 25 |
| M52 | 2″ | HLS-52S | 53.6 | 80.0 | 1 |
| M56 | 2 1/4″ | HLS-56S | 59.1 | 85.0 | 1 |
| M60 | — | HLS-60S | 63.1 | 90.0 | 1 |
| M64 | 2 1/2″ | HLS-64S | 67.1 | 95.0 | 1 |
| M68 | — | HLS-68S | 71.1 | 100.0 | 1 |
| M72 | — | HLS-72S | 75.1 | 105.0 | 1 |
| M76 | 3″ | HLS-76S | 79.1 | 110.0 | 1 |
Stainless steel A4, wide (HLB-…S) · 22 sizes
| M | UNC | Stainless Steel Item No. | Inner Ø d (mm) | Outer Ø D (mm) | Box qty (pairs) |
|---|---|---|---|---|---|
| M3.5 | #6 | HLB-3.5S | 3.9 | 9.0 | 200 |
| M4 | #8 | HLB-4S | 4.4 | 9.0 | 200 |
| M5 | #10 | HLB-5S | 5.4 | 10.8 | 200 |
| M6 | — | HLB-6S | 6.5 | 13.5 | 200 |
| — | 1/4″ | HLB-6S | 6.5 | 13.5 | 200 |
| M8 | 5/16″ | HLB-8S | 8.6 | 16.6 | 200 |
| M10 | — | HLB-10S | 10.7 | 21.0 | 200 |
| M12 | — | HLB-12S | 13.0 | 25.4 | 100 |
| — | 1/2″ | HLB-1/2″S | 13.5 | 25.4 | 100 |
| M14 | 9/16″ | HLB-14S | 15.2 | 30.7 | 100 |
| M16 | 5/8″ | HLB-16S | 17.0 | 30.7 | 100 |
| M18 | — | HLB-18S | 19.5 | 34.5 | 100 |
| — | 3/4″ | HLB-3/4″S | 20.0 | 39.0 | 100 |
| M20 | — | HLB-20S | 21.4 | 39.0 | 100 |
| M22 | 7/8″ | HLB-22S | 23.4 | 42.0 | 50 |
| M24 | — | HLB-24S | 25.3 | 48.5 | 50 |
| — | 1″ | HLB-1″S | 27.9 | 48.5 | 50 |
| M27 | — | HLB-27S | 28.4 | 48.5 | 25 |
| M30 | 1 1/8″ | HLB-30S | 31.4 | 58.5 | 25 |
| M33 | 1 1/4″ | HLB-33S | 34.4 | 58.5 | 25 |
| M36 | 1 3/8″ | HLB-36S | 37.4 | 63.0 | 25 |
| M39 | 1 1/2″ | HLB-39S | 40.4 | 75.5 | 25 |
254 SMO®, narrow · 24 sizes
| M | UNC | 254 SMO® Item No. | Inner Ø d (mm) | Outer Ø D (mm) | Box qty (pairs) |
|---|---|---|---|---|---|
| M3 | — | HLS-3SMO254 | 3.4 | 7.0 | 200 |
| M3.5 | — | HLS-3.5SMO254 | 3.9 | 7.6 | 200 |
| M4 | — | HLS-4SMO254 | 4.4 | 7.6 | 200 |
| M5 | — | HLS-5SMO254 | 5.4 | 9.0 | 200 |
| M6 | — | HLS-6SMO254 | 6.5 | 10.8 | 200 |
| — | 1/4″ | HLS-1/4″SMO254 | 7.2 | 11.5 | 200 |
| M8 | — | HLS-8SMO254 | 8.6 | 13.5 | 200 |
| — | 3/8″ | HLS-3/8″SMO254 | 10.0 | 16.0 | 200 |
| M10 | — | HLS-10SMO254 | 10.7 | 16.6 | 200 |
| M11 | — | HLS-11SMO254 | 11.4 | 18.5 | 200 |
| M12 | — | HLS-12SMO254 | 13.0 | 19.5 | 200 |
| — | 1/2″ | HLS-1/2″SMO254 | 13.5 | 19.5 | 200 |
| M14 | — | HLS-14SMO254 | 15.2 | 23.0 | 100 |
| M16 | — | HLS-16SMO254 | 17.0 | 25.4 | 100 |
| M18 | — | HLS-18SMO254 | 19.5 | 29.0 | 100 |
| — | 3/4″ | HLS-3/4″SMO254 | 20.0 | 30.7 | 100 |
| M20 | — | HLS-20SMO254 | 21.4 | 30.7 | 100 |
| M22 | — | HLS-22SMO254 | 23.4 | 34.5 | 100 |
| M24 | — | HLS-24SMO254 | 25.3 | 39.0 | 100 |
| — | 1″ | HLS-1″SMO254 | 27.9 | 39.0 | 100 |
| M27 | — | HLS-27SMO254 | 28.4 | 42.0 | 50 |
| M30 | — | HLS-30SMO254 | 31.4 | 47.0 | 50 |
| M33 | — | HLS-33SMO254 | 34.4 | 48.5 | 25 |
| M36 | — | HLS-36SMO254 | 37.4 | 55.0 | 25 |
254 SMO®, wide · 23 sizes
| M | UNC | 254 SMO® Item No. | Inner Ø d (mm) | Outer Ø D (mm) | Box qty (pairs) |
|---|---|---|---|---|---|
| M3.5 | — | HLB-3.5SMO254 | 3.9 | 9.0 | 200 |
| M4 | — | HLB-4SMO254 | 4.4 | 9.0 | 200 |
| M5 | — | HLB-5SMO254 | 5.4 | 10.8 | 200 |
| M6 | — | HLB-6SMO254 | 6.5 | 13.5 | 200 |
| — | 1/4″ | HLB-1/4″SMO254 | 7.2 | 13.5 | 200 |
| M8 | — | HLB-8SMO254 | 8.6 | 16.6 | 200 |
| — | 3/8″ | HLB-3/8″SMO254 | 10.3 | 21.0 | 200 |
| M10 | — | HLB-10SMO254 | 10.7 | 21.0 | 200 |
| M12 | — | HLB-12SMO254 | 13.0 | 25.4 | 100 |
| — | 1/2″ | HLB-1/2″SMO254 | 13.5 | 25.4 | 100 |
| M14 | — | HLB-14SMO254 | 15.2 | 30.7 | 100 |
| M16 | — | HLB-16SMO254 | 17.0 | 30.7 | 100 |
| M18 | — | HLB-18SMO254 | 19.5 | 34.5 | 100 |
| — | 3/4″ | HLB-3/4″SMO254 | 20.0 | 39.0 | 100 |
| M20 | — | HLB-20SMO254 | 21.4 | 39.0 | 100 |
| M22 | — | HLB-22SMO254 | 23.4 | 42.0 | 50 |
| M24 | — | HLB-24SMO254 | 25.5 | 47.5 | 50 |
| — | 1″ | HLB-1″SMO254 | 27.9 | 48.5 | 50 |
| M27 | — | HLB-27SMO254 | 28.4 | 48.5 | 25 |
| M30 | — | HLB-30SMO254 | 31.4 | 58.5 | 25 |
| M33 | — | HLB-33SMO254 | 34.4 | 58.5 | 25 |
| M36 | — | HLB-36SMO254 | 37.4 | 63.0 | 25 |
| M39 | — | HLB-39SMO254 | 40.4 | 75.5 | 25 |
Alloy 718, narrow · 13 sizes
| M | Alloy 718 Item No. | Inner Ø d (mm) | Outer Ø D (mm) | Box qty (pairs) |
|---|---|---|---|---|
| M3 | HLS-3ALL718 | 3.4 | 7.0 | 200 |
| M3.5 | HLS-3.5ALL718 | 3.9 | 7.6 | 200 |
| M4 | HLS-4ALL718 | 4.4 | 7.6 | 200 |
| M5 | HLS-5ALL718 | 5.4 | 9.0 | 200 |
| M6 | HLS-6ALL718 | 6.5 | 10.8 | 200 |
| M8 | HLS-8ALL718 | 8.6 | 13.5 | 200 |
| M10 | HLS-10ALL718 | 10.7 | 16.6 | 200 |
| M12 | HLS-12ALL718 | 13.0 | 19.5 | 200 |
| M14 | HLS-14ALL718 | 15.2 | 23.0 | 100 |
| M16 | HLS-16ALL718 | 17.0 | 25.4 | 100 |
| M18 | HLS-18ALL718 | 19.5 | 29.0 | 100 |
| M20 | HLS-20ALL718 | 21.4 | 30.7 | 100 |
| M22 | HLS-22ALL718 | 23.4 | 34.5 | 100 |
Alloy 718, wide · 14 sizes
| M | Alloy 718 Item No. | Inner Ø d (mm) | Outer Ø D (mm) | Box qty (pairs) |
|---|---|---|---|---|
| M3 | HLS-3ALL718 | 3.4 | 7.0 | 200 |
| M3.5 | HLS-3.5ALL718 | 3.9 | 7.6 | 200 |
| M4 | HLS-4ALL718 | 4.4 | 7.6 | 200 |
| M5 | HLS-5ALL718 | 5.4 | 9.0 | 200 |
| M6 | HLS-6ALL718 | 6.5 | 10.8 | 200 |
| M8 | HLS-8ALL718 | 8.6 | 13.5 | 200 |
| M10 | HLS-10ALL718 | 10.7 | 16.6 | 200 |
| M12 | HLS-12ALL718 | 13.0 | 19.5 | 200 |
| M14 | HLS-14ALL718 | 15.2 | 23.0 | 100 |
| M16 | HLS-16ALL718 | 17.0 | 25.4 | 100 |
| M18 | HLS-18ALL718 | 19.5 | 29.0 | 100 |
| M20 | HLS-20ALL718 | 21.4 | 30.7 | 100 |
| M22 | HLS-22ALL718 | 23.4 | 34.5 | 100 |
| M24 | HLS-24ALL718 | 25.3 | 39.0 | 100 |
HLS = narrow (standard) bearing face, HLB = wide bearing face for soft materials, slotted or oversized holes. * Sizes marked with an asterisk are ETA approved. Non-standard sizes and other materials on request.
Technical data
| Locking principle | Wedge locking by preload (tension), not friction. Certified to DIN 25201-4; tested to DIN 65151, NASM 1312-7 and ISO 16130 |
|---|---|
| Steel washers | C45E (1.1191), through-hardened, zinc flake coated (flZnnc); hardness 485 ± 25 HV0.3; −40 °C to 200 °C |
| Stainless washers | 1.4404 (316L), surface-hardened, > 520 HV0.1; corrosive non-acidic media; −200 °C to 500 °C |
| 254 SMO® washers | 1.4547; chlorides, sea water, offshore and acidic media; −200 °C to 500 °C |
| Alloy 718 washers | INCONEL® / 2.4668; high temperatures above 500 °C up to 700 °C; down to −200 °C |
| Bolt grades | Property classes 8.8, 10.9, 12.9 (and lower) with matching nuts; stainless A2-70 / A4-80 with stainless washers |
| Threads | ISO metric coarse thread and UNC. For fine threads ask us: special washers may be needed |
| Mating surface hardness | Must be softer than the washer: max. approx. 430–460 HV (44–46 HRC) for steel washers, 520 HV for stainless |
| Coatings / paint | Fit before painting where possible. Paint or coating thicker than 250 µm must be verified by test |
| Re-use | Re-usable when teeth and cams are undamaged |
| 3D CAD data | Available for all HEICO-LOCK® products (CADENAS PARTcommunity) |
Choosing and fitting the right washer
| Joint | Recommendation |
|---|---|
| Bolt and nut (through-hole) | One pair under the bolt head and one pair under the nut. Hold one side while tightening the other |
| Tapped (blind) hole | One pair under the bolt head is enough; no thread adhesive needed |
| Stud or threaded rod | Pair under the nut(s) |
| Round or countersunk hole | Narrow bearing face (HLS) |
| Slotted or oversized hole, soft material | Wide bearing face (HLB), with flange bolts or flange nuts if needed |
| Plain washers | Not recommended. If unavoidable, the plain washer must be fixed so it cannot rotate |
| Extra thread locking | Not needed and not recommended: it works against the wedge function |
| Lubrication | Lubricate thread and the turning bearing face; always with stainless parts (galling) |
| Tightening | Calibrated torque wrench; never “by feel”. Use new bolts for first assembly |
Torque recommendations (ISO metric coarse thread)
Steel washers with property class 8.8 bolts
| Thread | Washer | Preload FM (kN), paste | Torque MA (Nm), paste | Preload FM (kN), dry | Torque MA (Nm), dry |
|---|---|---|---|---|---|
| M3x0.5 | HL-3 | 2.4 | 1.3 | 2.0 | 1.3 |
| M3.5x0.6 | HL-3.5 | 3.3 | 2.1 | 2.7 | 2.1 |
| M4x0.7 | HL-4 | 4.2 | 3.1 | 3.5 | 3.1 |
| M5x0.8 | HL-5 | 6.8 | 6.0 | 5.6 | 6.0 |
| M6x1 | HL-6 | 9.7 | 10.5 | 8.0 | 10.5 |
| M8x1.25 | HL-8 | 17.6 | 25.1 | 14.5 | 25.3 |
| M10x1.5 | HL-10 | 27.8 | 49.5 | 23.0 | 49.9 |
| M12x1.75 | HL-12 | 40.4 | 84.8 | 33.4 | 85.7 |
| M14x2 | HL-14 | 55.4 | 135.8 | 45.8 | 137.3 |
| M16x2 | HL-16 | 75.2 | 207.0 | 62.2 | 210.2 |
| M18x2.5 | HL-18 | 95 | 300 | 79 | 303 |
| M20x2.5 | HL-20 | 121 | 418 | 100 | 424 |
| M22x2.5 | HL-22 | 150 | 569 | 124 | 578 |
| M24x3 | HL-24 | 174 | 732 | 144 | 742 |
| M27x3 | HL-27 | 227 | 1 062 | 188 | 1 079 |
| M30x3.5 | HL-30 | 277 | 1 447 | 229 | 1 469 |
| M33x3.5 | HL-33 | 343 | 1 943 | 284 | 1 978 |
| M36x4 | HL-36 | 404 | 2 505 | 334 | 2 549 |
| M39x4 | HL-39 | 483 | 3 226 | 399 | 3 288 |
| M42x4.5 | HL-42 | 555 | 3 990 | 459 | 4 063 |
| M45x4.5 | HL-45 | 646 | 4 961 | 534 | 5 059 |
| M48x5 | HL-48 | 729 | 6 005 | 603 | 6 117 |
| M52x5 | HL-52 | 870 | 7 671 | 719 | 7 831 |
| M56x5.5 | HL-56 | 1 005 | 9 554 | 831 | 9 749 |
| M60x5.5 | HL-60 | 1 169 | 11 795 | 967 | 12 059 |
| M64x6 | HL-64 | 1 325 | 14 215 | 1 095 | 14 532 |
| M68x6 | HL-68 | 1 512 | 17 538 | 1 250 | 17 915 |
| M72x6 | HL-72 | 1 713 | 20 874 | 1 416 | 21 353 |
| M76x6 | HL-76 | 1 925 | 24 600 | 1 592 | 25 197 |
| M85x6 | HL-85 | 2 449 | 33 448 | 2 025 | 34 451 |
Bolt ISO 4017, phosphated. With assembly paste: µthread 0.10, µhead 0.16, 75% yield utilisation. Dry (as delivered): µthread 0.15, µhead 0.18, 62% utilisation.
Steel washers with property class 10.9 bolts
| Thread | Washer | Preload FM (kN), paste | Torque MA (Nm), paste | Preload FM (kN), dry | Torque MA (Nm), dry |
|---|---|---|---|---|---|
| M3x0.5 | HL-3 | 3.5 | 2.0 | 2.9 | 2.0 |
| M3.5x0.6 | HL-3.5 | 4.8 | 3.0 | 3.9 | 3.0 |
| M4x0.7 | HL-4 | 6.2 | 4.5 | 5.1 | 4.5 |
| M5x0.8 | HL-5 | 10.0 | 8.8 | 8.3 | 8.9 |
| M6x1 | HL-6 | 14.2 | 15.4 | 11.7 | 15.5 |
| M8x1.25 | HL-8 | 25.8 | 36.8 | 21.3 | 37.1 |
| M10x1.5 | HL-10 | 40.9 | 72.7 | 33.8 | 73.3 |
| M12x1.75 | HL-12 | 59.4 | 124.5 | 49.1 | 125.9 |
| M14x2 | HL-14 | 81.4 | 199.5 | 67.3 | 201.7 |
| M16x2 | HL-16 | 110.4 | 304.0 | 91.3 | 308.7 |
| M18x2.5 | HL-18 | 136 | 427 | 112 | 432 |
| M20x2.5 | HL-20 | 173 | 595 | 143 | 604 |
| M22x2.5 | HL-22 | 214 | 810 | 177 | 823 |
| M24x3 | HL-24 | 249 | 1 043 | 205 | 1 057 |
| M27x3 | HL-27 | 324 | 1 512 | 268 | 1 537 |
| M30x3.5 | HL-30 | 395 | 2 061 | 327 | 2 093 |
| M33x3.5 | HL-33 | 489 | 2 767 | 404 | 2 818 |
| M36x4 | HL-36 | 576 | 3 568 | 476 | 3 630 |
| M39x4 | HL-39 | 688 | 4 595 | 569 | 4 682 |
| M42x4.5 | HL-42 | 790 | 5 683 | 653 | 5 787 |
| M45x4.5 | HL-45 | 921 | 7 066 | 761 | 7 205 |
| M48x5 | HL-48 | 1 039 | 8 553 | 859 | 8 712 |
| M52x5 | HL-52 | 1 239 | 10 926 | 1 024 | 11 154 |
| M56x5.5 | HL-56 | 1 431 | 13 607 | 1 183 | 13 885 |
| M60x5.5 | HL-60 | 1 665 | 16 800 | 1 377 | 17 175 |
| M64x6 | HL-64 | 1 887 | 20 246 | 1 560 | 20 697 |
| M68x6 | HL-68 | 2 154 | 24 978 | 1 781 | 25 516 |
| M72x6 | HL-72 | 2 439 | 29 729 | 2 016 | 30 412 |
| M76x6 | HL-76 | 2 742 | 35 036 | 2 267 | 35 886 |
| M85x6 | HL-85 | 3 448 | 47 638 | 2 884 | 49 067 |
Bolt ISO 4017, phosphated. With assembly paste: µthread 0.10, µhead 0.16, 75% yield utilisation. Dry (as delivered): µthread 0.15, µhead 0.18, 62% utilisation.
Steel washers with property class 12.9 bolts
| Thread | Washer | Preload FM (kN), paste | Torque MA (Nm), paste | Preload FM (kN), dry | Torque MA (Nm), dry |
|---|---|---|---|---|---|
| M3x0.5 | HL-3 | 4.2 | 2.3 | 3.4 | 2.3 |
| M3.5x0.6 | HL-3.5 | 5.6 | 3.6 | 4.6 | 3.6 |
| M4x0.7 | HL-4 | 7.2 | 5.3 | 6.0 | 5.3 |
| M5x0.8 | HL-5 | 11.7 | 10.3 | 9.7 | 10.4 |
| M6x1 | HL-6 | 16.6 | 18.0 | 13.7 | 18.1 |
| M8x1.25 | HL-8 | 30.2 | 43.1 | 25.0 | 43.4 |
| M10x1.5 | HL-10 | 47.8 | 85.1 | 39.6 | 85.8 |
| M12x1.75 | HL-12 | 69.5 | 145.7 | 57.5 | 147.3 |
| M14x2 | HL-14 | 95.2 | 233.5 | 78.7 | 236.1 |
| M16x2 | HL-16 | 129.2 | 355.8 | 106.8 | 361.2 |
| M18x2.5 | HL-18 | 159 | 499 | 131 | 505 |
| M20x2.5 | HL-20 | 202 | 697 | 167 | 707 |
| M22x2.5 | HL-22 | 250 | 948 | 207 | 964 |
| M24x3 | HL-24 | 291 | 1 220 | 240 | 1 237 |
| M27x3 | HL-27 | 379 | 1 769 | 313 | 1 799 |
| M30x3.5 | HL-30 | 462 | 2 411 | 382 | 2 449 |
| M33x3.5 | HL-33 | 572 | 3 238 | 473 | 3 297 |
| M36x4 | HL-36 | 674 | 4 175 | 557 | 4 248 |
| M39x4 | HL-39 | 805 | 5 377 | 665 | 5 479 |
| M42x4.5 | HL-42 | 925 | 6 650 | 764 | 6 772 |
| M45x4.5 | HL-45 | 1 077 | 8 268 | 891 | 8 432 |
| M48x5 | HL-48 | 1 215 | 10 009 | 1 005 | 10 195 |
| M52x5 | HL-52 | 1 450 | 12 785 | 1 199 | 13 052 |
| M56x5.5 | HL-56 | 1 675 | 15 923 | 1 384 | 16 249 |
| M60x5.5 | HL-60 | 1 949 | 19 659 | 1 611 | 20 098 |
| M64x6 | HL-64 | 2 208 | 23 692 | 1 825 | 24 220 |
| M68x6 | HL-68 | 2 521 | 29 229 | 2 084 | 29 859 |
| M72x6 | HL-72 | 2 854 | 34 789 | 2 360 | 35 588 |
| M76x6 | HL-76 | 3 209 | 40 999 | 2 653 | 41 995 |
| M85x6 | HL-85 | 4.081.9 | 55 746 | 3 374 | 57 418 |
Bolt ISO 4017, phosphated. With assembly paste: µthread 0.10, µhead 0.16, 75% yield utilisation. Dry (as delivered): µthread 0.15, µhead 0.18, 62% utilisation.
Stainless steel washers with A2-70 bolts
| Thread | Washer | Preload FM (kN) | Torque MA (Nm) |
|---|---|---|---|
| M3x0.5 | HL-3S | 1.5 | 0.9 |
| M3.5x0.6 | HL-3.5S | 2.0 | 1.4 |
| M4x0.7 | HL-4S | 2.6 | 2.0 |
| M5x0.8 | HL-5S | 4.1 | 4.0 |
| M6x1 | HL-6S | 5.9 | 6.9 |
| M8x1.25 | HL-8S | 10.7 | 16.5 |
| M10x1.5 | HL-10S | 17.0 | 32.7 |
| M12x1.75 | HL-12S | 24.6 | 56.1 |
| M14x2 | HL-14S | 33.8 | 89.9 |
| M16x2 | HL-16S | 45.8 | 137.4 |
| M18x2.5 | HL-18S | 56 | 192 |
| M20x2.5 | HL-20S | 72 | 269 |
| M22x2.5 | HL-22S | 89 | 366 |
| M24x3 | HL-24S | 103 | 470 |
| M27x3 | HL-27S | 134 | 683 |
| M30x3.5 | HL-30S | 164 | 930 |
| M33x3.5 | HL-33S | 203 | 1 252 |
| M36x4 | HL-36S | 239 | 1 613 |
| M39x4 | HL-39S | 285 | 2 079 |
| M42x4.5 | HL-42S | 328 | 2 571 |
| M45x4.5 | HL-45S | 382 | 3 199 |
| M48x5 | HL-48S | 431 | 3 869 |
| M52x5 | HL-52S | 514 | 4 951 |
| M56x5.5 | HL-56S | 594 | 6 165 |
| M60x5.5 | HL-60S | 691 | 7 623 |
| M64x6 | HL-64S | 783 | 9 189 |
| M68x6 | HL-68S | 894 | 11 312 |
| M72x6 | HL-72S | 1 012 | 13 479 |
| M76x6 | HL-76S | 1 138 | 15 902 |
| M80x6 | HL-80S | 1 271 | 18 363 |
Stainless washers 1.4404, blank bolts lubricated with MoS2: µthread 0.14, µhead 0.15, 65% yield utilisation.
Stainless steel washers with A4-80 bolts
| Thread | Washer | Preload FM (kN) | Torque MA (Nm) |
|---|---|---|---|
| M3x0.5 | HL-3S | 2.0 | 1.2 |
| M3.5x0.6 | HL-3.5S | 2.6 | 1.8 |
| M4x0.7 | HL-4S | 3.4 | 2.7 |
| M5x0.8 | HL-5S | 5.5 | 5.3 |
| M6x1 | HL-6S | 7.8 | 9.2 |
| M8x1.25 | HL-8S | 14.3 | 22.1 |
| M10x1.5 | HL-10S | 22.6 | 43.6 |
| M12x1.75 | HL-12S | 32.9 | 74.8 |
| M14x2 | HL-14S | 45.0 | 119.9 |
| M16x2 | HL-16S | 61.1 | 183.2 |
| M18x2.5 | HL-18S | 75 | 256 |
| M20x2.5 | HL-20S | 95 | 359 |
| M22x2.5 | HL-22S | 118 | 488 |
| M24x3 | HL-24S | 137 | 627 |
| M27x3 | HL-27S | 179 | 911 |
| M30x3.5 | HL-30S | 219 | 1 240 |
| M33x3.5 | HL-33S | 270 | 1 669 |
| M36x4 | HL-36S | 319 | 2 150 |
| M39x4 | HL-39S | 381 | 2 772 |
| M42x4.5 | HL-42S | 437 | 3 428 |
| M45x4.5 | HL-45S | 509 | 4 265 |
| M48x5 | HL-48S | 575 | 5 158 |
| M52x5 | HL-52S | 686 | 6 601 |
| M56x5.5 | HL-56S | 792 | 8 219 |
| M60x5.5 | HL-60S | 921 | 10 163 |
| M64x6 | HL-64S | 1 044 | 12 253 |
| M68x6 | HL-68S | 1 192 | 15 082 |
| M72x6 | HL-72S | 1 349 | 17 972 |
| M76x6 | HL-76S | 1 517 | 21 203 |
| M80x6 | HL-80S | 1 694 | 24 484 |
Stainless washers 1.4404, blank bolts lubricated with MoS2: µthread 0.14, µhead 0.15, 65% yield utilisation.
Calculated guide values based on assumed friction coefficients. Friction strongly affects the torque–preload ratio, so for critical joints a torque/preload test (e.g. ISO 16047) is recommended. 1 Nm = 0.738 lb ft. UNC values on request.
How wedge locking works
α > β
The cam angle α is steeper than the thread pitch β. To turn loose, the bolt would have to stretch further, so it cannot.
Proof under vibration
Typical result of a transverse vibration (Junker) test, DIN 65151: preload (kN) against load cycles. Illustrative curves.
- Wedge lock washer pair
- Nylon insert nut
- Spring washer
- Plain nut and bolt
Which HEICO product for your joint?
Vibrating machines and vehiclesBolts that work loose under vibration or dynamic loadHEICO-LOCK® Wedge Lock Washers →Frequent maintenanceWashers fitted by hand again and againRing Lock Washers →Large bolts with power toolsNo room or no safe point for a reaction armReaction Washers →Far side out of reachTighten through-bolts from one side onlyHEICO-ONE® Safety Washer →Fewer parts on the lineNut and washer as one partWedge Lock Nuts / PLUS →Truck and trailer wheelsSteel disc wheels that must stay tightWheel Nuts →Bridges and steelworkPreloaded HV sets to EN 14399HLK-Washers →Very large bolts, M20 to M160High preload with a hand torque wrenchHEICO-TEC® Tension Nuts →
The HEICO range at a glance
| Product | Sizes | Material / class | Key point |
|---|---|---|---|
| Wedge Lock Washers | M3–M76 · #5–3″ | Steel, A4, 254 SMO®, Alloy 718 | Narrow (HLS) or wide (HLB); bolts 8.8–12.9 |
| Ring Lock Washers | M4–M24 | Steel, A4 | Pair held by a PA ring |
| Reaction Washers | M12–M48 · ½″–1⅞″ | Steel, black zinc flake | Gear rim, dual socket, pre-glued pairs |
| HEICO-ONE® Safety Washer | M16–M48 | Steel, black zinc flake | Wave ribs, passive side |
| Wedge Lock Nuts | M6–M27 · M14×1.5–M24×1.5 | Class 10 nut | Nut and washer pair in one |
| Wheel Nuts | M14×1.5–M24×1.5 · 7/8″-11 BSF | Class 10, zinc flake | Captive washers, steel disc wheels |
| HLK-Washers | M12–M36 | Zinc flake coated | EN 14399, DIBt and EBA approved |
| Combi-Washers | M8–M20 | Steel, stainless | Inset tabs, standard bolts |
| HEICO-LOCK® PLUS | M6–M24 | Steel, stainless | ISO 4032 nut + wedge washer |
| HEICO-TEC® Tension Nuts | M20–M160 (cl. 8) · M20–M100 (cl. 10) | ISO 898-2 | Torque wrench only, axial preload |
Where wedge lock washers are not the right choice
- When the clamped parts can move against each other
- When the mating surfaces are harder than the washers
- On very soft surfaces such as wood and plastic
- Where settlement is extremely large
Fitting in four steps
1 · Fit the pairPut the washer pair under the part you will turn, teeth facing the bolt head and the joint. Use a pair under both head and nut for through-holes.
2 · LubricateLubricate the thread and under the turning part. Wedge locking works with lubrication, and it gives a more accurate preload.
3 · Tighten to torqueUse a calibrated torque wrench or power tool to the torque for your bolt grade and lubricant. Ask us for values for your joint.
4 · Re-use when servicedWedge lock washers can be re-used if the teeth and cams are not damaged.
Key features
- Locks by preload, not friction
- Works with lubricated bolts
- Certified to DIN 25201-4
- Bonded pairs: cannot be fitted wrongly
- Re-usable
- Four materials for every environment
- Narrow and wide bearing faces
- Metric and UNC sizes
Applications
Agricultural and construction machineryMechanical and plant engineeringOffshore, marine and desalinationWind turbines and power plantsRailway vehiclesMining, crushers and screensChemical and process plants
Need a size, grade or finish not listed? We also make special and non-standard parts to drawing. Ask us →
Related products
All products →You may also need
HEICO-LOCK® Ring Lock WashersWedge lock washer pairs held in a polyamide ring: always in the right position, ideal for repeated fitting. M4 to M24.View details →
HEICO-LOCK® Reaction WashersWedge lock washers with a gear-shaped rim: tighten M12 to M48 bolts with power tools and no reaction arm, then stay locked.View details →
HEICO-ONE® Safety WasherSingle back-up washer with wave-shaped ribs on both faces: holds the passive side so large bolts can be tightened from one side. M16 to M48.View details →
HEICO-LOCK® Wedge Lock NutsClass 10 nut with a captive, rotating wedge lock washer pair in one part. M6 to M27 and fine thread M14×1.5 to M24×1.5.View details →