TECHNICAL DOCUMENTATION

Transcription

1 vargal Self-locking nut TECHNICAL DOCUMENTATION

2 PROPERTIES 2 A) MATERIALS AND MARKING The Vargal nuts are prouce by turning. This prouction process allows more accurate tolerances an better finishing. Vargal nuts in class 10 an 05 are machine with not harene an tempere steel for technical reasons. TABLE 1 PROPERTY CLASS HARDNESS HV 30 Material ø Low Min Max Free machining steel Carbon steel Stainless steel M3-M M3-M M27-M M27-M M5-M M27-M The marking on the nut means its property class. The fitting has to be carrie out with screws belonging to the same corresponing property class: Property class 8 or 04 nuts must be screwe on 8.8 screws Property class 10 or 05 nuts must be screwe on 10.9 screws; nuts must be screwe on or A4 70/80 screws or on high strength screws (minimum 10.9); B) PROOF LOAD The vargal nuts surpass the proof loa require by the stanar EN ISO 2320, talbe below. TABLE 2 (EXTRACT FROM EN ISO AND EN ISO 898-6) PROOF LOAD VALUES (STANDARD PITCH) PROOF LOAD VALUES (FINE PITCH) ø Pitch mm Prüfkraft (N) M3 0, M4 0, M5 0, M M8 1, M10 1, M12 1, M M M18 2, M20 2, M22 2, M M M30 3, M33 3, M ø Pitch mm Prüfkraft (N) M M10 1, M12 1, M12 1, M14 1, M16 1, M18 1, M20 1, M22 1, M M M M M C) PART NUMBER VARGAL Part numbers for Vargal nuts are shown on the tables 3-4 on next page, an consist of at least six characters with the following meanings: -1 V = Vargal -2 un 3 Threa iameter -4 M = metric threa stanar other letter = metric threa fine -5 Y = stanar height B = low height (LOW) -6 1 = 8 or 04 steel 2 = 10 or 05 steel 3 = stainless steel In aition to these six characters, furhter tow characters can be ae: -7 G = GEOMET 500B coating V = olive green zinc plating W = white zinc plating P = passivation -8 A = high precailing torque L = low prevailing torque Part number example V12MY2GA = Vargal nut M 12, class 10 GEOMET, high prevailing torque V16MY1W = Vargal nut M16, class 8, V20PB3L Cr3 white zinc plating, meium prevailing torque = Vargal Mutter M20x1,5 LOW, stainless steel, low prevailing torque V24MY2VL = Vargal Mutter M24, class 10, olive green zinc plating, low prevailing torque

3 PROPERTIES 3 D) DIMENSIONS Technical information regaring locknut imensions is liste on tables 3 an 4. h s h m m TABLE 3 AND 4 VARGAL STANDARD VARGAL LOW Fine s h (max) m (min) weight (g) Fine s h (max) m (min) weight (g) 3 0,5-5,5 4,2 2,3 0,4 4 0,7-7 5,5 3, ,8-8 6,3 3,9 1, , ,2 4,4 2,8 8 1, ,8 6,6 6,6 10 1,5 1, ,6 7, ,75 1, , , , , , , ,6 13, ,5 1, ,5 14, ,5 1, ,5 16, ,5 1, ,8 19, , ,7 23, , ,3 2,5 1,9 8 1, ,1 3,9 4,4 10 1,5 1, ,6 4,9 8,8 12 1,75 1, ,4 5, , ,4 5, , , , ,6 7, ,5 1, ,5 8, ,5 1, ,1 9, ,5 1, ,1 10, ,7 10, ,2 11, , ,7 14, , ,2 15, , , , , ,5 28, ,2 31,2 472 The final coe number ientifies the material: 1 = class 8 or 04 steel; 2 = class 10 or 05 steel; 3 = stainless steel Diameters higher than M36 an Imperial measurements are available upon request.

4 PROPERTIES 4 E) SCREWING PROCEDURES The tightening torques liste on tables 6 an 7 are referre to zinc plate or GEOMET 500B coate nuts, an are applie to assembling without aition of lubricant. The Vargal nuts are supplie with a light film of lubricant necessary an sufficient for the tightening. A light lubrication on the screw is recommene in case of extene screwing (more than tow screw s iameters). At least a three screw threas projection is require for the best fit. For assembling an isassembling with automatic screwrivers, the recommene rotation spee must not excee 25 Revolutions per minute. The seizure tenency which coul occur especially with stainless steel locknuts, ue to the higher than recommene rotations spee, coul be limite by coating the screw threas with a light film of Molykote G-N PLUS. F) TIGHTENING TORQUE The clamping force values require by EN ISO 2320 for the corresponing property class are guarantee. Accoring to the test conitions efine by EN ISO 2320 Vargal nuts isplay an average friction coefficient of µm 0.09 up to iameter M 24 inclue, µm 0.12 for higher sizes. The tow friction coefficients etermine the suggeste values of tightening torque shown on the following tables (6 an 7). The use of a higher tightening torque than the suggeste one, coul cause an exceeing axial stress with consequent reuction of the removal prevailing torque an, on exceptional cases, failure of the screw an the nut. G) ACTUAL TIGHTENING TORQUE Accoring to his knowlege, the final customer must ecie the actual tightening torque for every single assembling. In any case, the tightening torque have to be calculate consiering the total assemble components: screws: surface, coating, possible lubrication; washers: material, treatment, surface coating nut: specifie coating (possible n Tension or similar) temperature screwing tools type of assemling H) PREVAILING TORQUES The new concept springs allow to ajust the values of prevailing torque in function of the requeste resistance to vibration. Vargal nuts are available with three ifferent prevailing torque levels: meium prevailing torque, which is supplie, if others are not specifie by the final customer low prevailing torque high prevailing torque TABLE 5 AVAILABLE PREVAILING TORQUES Metric threa stanar - fine On table 5 the values of prevailing torque at the first unscrewing Prevailing Prevailing Prevailing 1 st for each iameter are shown, effective for nuts ø- nut LOW high Assembling Coe L meium Coe A Max Nm in class 8, 10 an Stainless Steel, in STANDARD an Nm Nm Nm EN ISO 2320 LOW version, as well as the values of the max screwing prevailing torque for nuts in class 8 steel. To request High or Low prevailing torque the customer must a at the en of the part number: A for HIGH PREVAILING TORQUE L for LOW PREVAILING TORQUE M6 M8 M10 M12 M14 M16 0,1-0,5 0,3-1 0,5-1,7 1-2,5 1,2-3 1,5-4 0,3-0,8 0, ,8 1,6-4 2, , ,5-8 4, ,5 15, M , The prevailing torque of the 5th unscrewing foreseen M , by EN ISO 2320 has been taken as lower tolerance M22 3,5-9 6,5-13 8, limit of the meium prevailing torque. M M M M M

5 PROPERTIES 5 TABLE 6 AND 7 SUGGESTED TIGHTENING - VARGAL 10 STANDARD Dimension 8 10 Stainless steel High strength steel screws (10.9) -70 stainless steel screws Fine Fine Fine Fine Fine Fine Fine Fine Fine 3 0,5-0,9-2, ,7-2,2-3, ,8-4,5-6,2-7,2-8,9-6,4-7,9-3,6-4, ,75 7,5 7,8 8,7 9, ,7 12,5 13, ,6 11,3 12,3 6 6,5 6,6 7,4 8 1, , ,8 24, ,5 21, , ,9 10 1, ,3 26, ,1 38, ,75 1, ,7 38, ,5 54, ,8 53, ,4 30,2 12-1, , , , , , ,4 70, ,2 43, , ,2 72, ,5 104, , , ,5 1, ,3 97, ,3 134, ,5 129, ,8 73,8 20 2,5 1, ,3 122, ,3 169, ,4 165, ,6 95,2 22 2,5 1, , , , ,8 239, ,9 231, ,4 134, ,3 223, , , ,8 279, ,5 386, , , ,5 389, ,5 538, SUGGESTED TIGHTENING - VARGAL 10 LOW Dimension 8 10 Stainless steel High strength steel screws (10.9) -70 stainless steel screws Fine Fine Fine Fine Fine Fine Fine Fine Fine 6 1 0,75 5 5,3 5,7 5,8 5,6 6,1 7,5 7,8 6 6,2 5 5,5 4 4,2 3,3 3,6 8 1, ,6 10,4 11, ,7 13,7 14, ,6 14, ,4 7,6 8,2 10 1, ,5 17, , ,2 24, ,7 13,6 14,4 12 1,75 1, , , ,9 37,7 33,5 36,3 19,5 21,5 12-1, , , , ,8 35, ,1 46, ,8 45, ,8 30,5 30, , ,8 47, ,9 62, , ,6 33,4 33,4 18 2,5 1, ,7 61, , ,3 76, ,6 44,2 44,2 20 2,5 1, ,8 77, , ,4 98, ,5 1, ,3 94, ,6 124, ,5 62, ,6 109, , ,7 119, ,3 69, ,8 141, , , , ,4 232, , ,7 216, ,3 285, ,9 246, ,4 324,

6 PROPERTIES 6 The liste tightening torques are referre to zinc plate or GEOMET 500B coate nuts an are applie to assemblies without aition of lubricant. The locknuts are supplie with alight film of lubricant necessary an sufficient for the tightening. A light lubrication is recommene in case of extene screwing (more than two screw iameters). The tightening torque must be ecie by the final customer, which is the only one who knows the real area applications. At least a three screw threas projection is require for the best fit. For assembling an isassembling with automatic screw rivers, the recommene rotation spee must not excee 25 revolutions per minute. The seizure tenency which coul occur specially with stainless steel locknuts, ue to the higher than recommene rotation spee, coul be limite by coating the screw threas with a light film of Molykote G-N PLUS!. I) MARKING OFT HE NUTS The ifferent Prevailing torque level is stampe next to the mark as follows: low torque: ot on the left sie of the V (figure 1) meium torque: no ots (figure 2) high torque: ot on the right sie of the V (figure 3) figure 1 Marking Vargal class 8 Low prevailing torque (coe L) figure 2 Marking Vargal class 8 Meium prevailing torque figure 3 Marking Vargal class 8 High prevailing torque (coe A) J) RESISTANCE TO VIBRATIONS Vargal nuts show a strong resistance to vibrations, 3 4 times higher in comparison to insert or eforme locknuts, as vibrations ai the spring sliing on the collar, improving the prevailing torque action, an avoiing the nut loss. In fact the removal prevailing torque of the nut uner vibrations is much higher than the removal prevailing torque in static conitions. Vibration tests carrie out on Vargal nuts, accoring to the stanar UNI : no assembling tension frequenca 50Hz amplitue 4 mm acceleration 20g excitation time 30min to 10h epening on the consiere iameter have given positive results without showing any rupture, loss or more than 30 rotation of the locknut. The increasing of prevailing torque ratio 2, uring the test, kept the Vargal on the starting position. In the eprecate case of failure by one or more sectors of the collar, the elastic pressure exerte by the spring allows to keep the locknut on the original position. Security function by the locknut is guarantee. K) UTILIZATION no clamping force Vargal nuts can be use in applications without any tightening torques. Vargal nuts keep the esire position because the prevailing torque is not in relation with the clamping force. Such purpose allows the movement of the assemble elements, unrelate to the clamping of the joint, avoiing the loss of the parts. Vargal nuts can be use as ajustable limit stop in ifferent mechanical fiels. after the first tightening Vargal nuts can be use several times before starting the application. After starting the application, they can be re-use after been properly cleane an having checke the functional characteristics of the locknuts. Vargal nuts guarantee a constan prevailing torque, even after several isassembling (see graph2). This feature is ue to the fact that the elastic locking element oes not irectly act on the threas an consequently is not subject to wear. The effectiveness of the locking action of the Vargal nuts is not reuce in the presence of paint or other substances that coul wege themselves in the collar sectors uring the use as the istance between the sectors ensure their mobility anyhow. NOTE will not assume any responsibility in case of locknut reuse, without precautionary check of the locknut performances (prevailing torque/clamping force) with satisfactory results.

7 EIGENSCHAFTEN 7 ANZAHL DER WIEDERVERWENDUNGEN Die nachfolgene Grafik zeigt en Vergleich er Wieerverwenungsmöglichkeiten bei Muttern mit metallischem un nichtmetallischem Klemmteil sowie er Vargal Mutter. GRAFIK 2 vargal (konstantes Klemmrehmoment wieerverwenbar ohne Klemmkraftverlust) > 30 Muttern mit metallischem Klemmteil (Klemmrehmoment nimmt ab beingt wieerverwenbar mit Klemmkraftverlust) Muttern mit nichtmetallischem Klemmteil (Klemmrehmoment nimmt stark ab sollte nicht wieerverwenet weren!) 5-10 L) KORROSIONSBESTÄNDIGKEIT Die Vargal Muttern stehen in verschieenen Ausführungen zur Verfügung, ie bestänig sin gegen unterschielichste Korrosionsstufen, je nach Art es Verwenungszwecks: Zinkpassivierung weiß Cr3 GEOMET 500B oer Nichtrostener Stahl (Mutter un Feer). M) VERWENDUNG BEI HOHEN TEMPERATUREN Die Vargal Muttern halten Temperaturen von -50 C bis+ 300 C stan. Die erreichbaren Höchststemperaturen hängen von en spezifischen Anwenungsbeingungen ab un weren urch verschieene Faktoren beeinflusst (Wärmequelle, Lüftung, Feuchtigkeit usw.). Beim Einsatz unter aneren Temperaturen als oben angegeben wir empfohlen, Prüfungen bei reellen Anwenungsbeingungen urchzuführen. KPO Schrauben un Normteile GmbH Köbbingser Mühle Iserlohn T: (0) F: (0) M: anfragen@schrauben.e