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VÒNG ĐỆM KHÓA NORD LOCK / VÒNG ĐỆM CHỐNG XOAY NORD LOCK/ LONG ĐỀN CHỐNG XOAY NORD LOCK
Nord-Lock Steel Washers |
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| Applications | General steel applications | |||
| Material standard | EN 1.7182 | |||
| Size range | M3-M130 #5 to 5″ |
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| Corrosion resistance | Minimum 1,000 hours in salt spray test (according to ISO 9227) | |||
| Hardening | Through hardened | |||
| Washer hardness* | ≥ 465HV1 | |||
| Coating | Delta Protekt® KL100 zinc flake coating | |||
| Bolt grades | Up to 12.9 | |||
| Temperature range*** | -50°C to 200°C | |||
| Product designation | NL NLsp |
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| Laser marking type code | flZn | |||
* Washer hardness must be greater than the hardness of the mating surfaces in order to assure its mechanical function.
*** Temperature recommendations are based on information from the raw material supplier and testing. The locking function is not affected within the specified range.
Selection Guide
| Application parameter | ||||
| Steel | Stainless steel (ss) |
254 SMO® | ALLOY C-276 |
ALLOY 718 |
| Steel type | ||||
| EN 1.7182 | EN 1.4404 | EN 1.4547 | EN 2.4819 or equivalent | EN 2.4668 or equivalent |
| Examples of applications | ||||
| General steel applications | General stainless steel applications. Non chlorine / acid environments | General salt water applications, pumps, chloride applications, heat exchangers, nuclear, desalination, food processing & medical equipment | General acidic environments, process and chemical industry, evaporators, offshore downhole tooling | Applications with high temperatures, gas turbines, turbo charges, incinerators |
| Available for bolt sizes | ||||
| M3-M130
#5 to 5″ |
M3-M80
#5 to 3 1/8″ |
M3-M39
#5 to 1 1/2″ |
M3-M39 available on request
#5 to 1 1/2″ available on request |
M3-M39 available on request
#5 to 1 1/2″ available on request |
| Washer types | ||||
| Regular outer diameter (NL3 – NL130)
Enlarged outer diameter (NL3,5sp – NL36sp) |
Regular outer diameter (NL3ss-NL80ss)
Enlarged outer diameter (NL3,5spss – NL30spss) |
Regular outer diameter (NL3ss-254 – NL39ss-254)
Enlarged outer diameter (NL3,5spss-254 – NL27spss-254) |
Regular outer diameter (NL3ss-276 – NL39ss-276)
Enlarged outer diameter (NL3,5spss-276 – NL27spss-276) |
Regular outer diameter (NL3ss-718 – NL39ss-718)
Enlarged outer diameter (NL3,5spss-718 – NL27spss-718) |
| Treatment surface coating | ||||
| Through hardened Delta Protekt® base coat (KL100) and top coat (VH302GZ) | Surface hardened | Surface hardened | Surface hardened | Surface hardened |
| Washer hardness* | ||||
| ≥ 465HV1 | ≥ 520HV0,05 | ≥ 600HV0,05 | ≥ 520HV0,05 | ≥ 620HV0,05 |
| Corrosion resistance | ||||
| Minimum 1,000 hours in salt spray test (according to IS09227) | PREN 26** | PREN 45** | PREN 68** | PREN 29** |
| Bolt grades | ||||
| Up to 12.9 | Up to A4-80 | Up to A4-80 | Up to A4-80 | Up to A4-80 |
| Temperature range*** | ||||
| -50°C to 200°C | -160°C to 500°C | -160°C to 500°C | -160°C to 500°C | -160°C to 700°C |
* In order to assure the unique mechanical locking function of the Nord-Lock washers, the hardness of the mating surfaces must be lower than the hardness of the Nord-Lock washers.
** PREN (Pitting Resistance Equivalent Number) = %Cr + 3,3x%Mo + 16x%N. Figures in table valid for base material.
*** Temperature recommendations based on information from the raw material supplier and from tests. Locking function not affected within the specification.
Hardness Conversion Table
| Vickers HV |
Brinell HB |
Rockwell HRC | Rockwell HRA | 8.8 bolt |
10.9 bolt | 12.9 bolt |
| 300 | 285 | 29,8 | 65,5 | | | ||
| 310 | 295 | 31,0 | 65,8 | | | ||
| 320 | 304 | 32,2 | 66,4 | | | 320 HV | |
| 330 | 314 | 33,3 | 67,0 | | | | | |
| 335 | 319 | 33,9 | 67,3 | 335 HV | | | |
| 340 | 325 | 34,4 | 67,6 | | | ||
| 350 | 333 | 35,5 | 68,1 | | | ||
| 360 | 342 | 36,6 | 68,7 | | | ||
| 370 | 352 | 37,7 | 69,2 | | | ||
| 380 | 361 | 38,8 | 69,8 | 380 HV | ||
| 385 | 366 | 39,3 | 70,1 | 385 HV | ||
| 390 | 371 | 39,8 | 70,3 | | | ||
| 400 | 380 | 40,8 | 70,8 | | | ||
| 410 | 390 | 41,8 | 71,4 | | | ||
| 420 | 399 | 42,7 | 71,8 | | | ||
| 430 | 409 | 43,6 | 72,3 | | | ||
| 435 | 414 | 44,1 | 72,5 | 435 HV | ||
| 440 | 418 | 44,5 | 72,8 | |||
| 460 | 437 | 46,1 | 73,6 | |||
| 480 | (456) | 47,7 | 74,5 | |||
| 500 | (475) | 49,1 | 75,3 | |||
| 520 | (494) | 50,5 | 76,1 | |||
| 540 | (513) | 51,7 | 76,7 |
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