AS 1275 Cup Head Bolt Long Square Neck Gal With ISO4032 HEX NUTS Carriage Bolt HDG
Process flow
Cold forging
Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ thread rolling ➨make heat treatment(if need) ➨ Finish ➨ Packing
Hot forging
Cutting material ➨ hot forging ➨ turning ➨ shrink diameter(half thread) ➨thread rolling ➨ make heat treatment(if need) ➨ Finish ➨ Packing
Product Grade
Class4.8 Class5.8 Class6.8 Class8.8 Class10.9 Class12.9
| NO. | Mechanical or
physical property | Property class |
| 4.6 | 4.8 | 5.6 | 5.8 | 6.8 | 8.8 | 9.8 | 10.9 | 12.9/12.9 |
| D≤16mma | d＞16mmb | d≤16mm |
| 1 | Tensile strength
Rm,Mpa | nom.c | 400 | 500 | 600 | 800 | 900 | 1000 | 1200 |
| max. | 400 | 420 | 500 | 520 | 600 | 800 | 830 | 900 | 1040 | 1220 |
| 2 | Lower yield strength
ReL,Mpa | nom.c | 240 | —— | 300 | —— | —— | —— | —— | —— | —— | —— |
| max. | 240 | —— | 300 | —— | —— | —— | —— | —— | —— | —— |
| 3 | Stress at 0,2 % nonproportional elongation
Rp0.2,Mpa | nom.c | —— | —— | —— | —— | —— | 640 | 640 | 720 | 900 | 1080 |
| max. | —— | —— | —— | —— | —— | 640 | 660 | 720 | 940 | 1100 |
| 4 | Stress at 0,0048 d non-proportional elongation for
full-size fasteners
Rpf,Mpa | nom.c | —— | 320 | —— | 400 | 480 | —— | —— | —— | —— | —— |
| max. | —— | 340e | —— | 420e | 480e | —— | —— | —— | —— | —— |
| 5 | Stress under proof load
Spf,Mpa | nom. | 225 | 310 | 280 | 380 | 440 | 580 | 600 | 650 | 830 | 970 |
Proof Sp,nom/ReL min Or
strength Sp,nom/Rp0.2min Or
rati Sp,nom/Rpf min
| 0.94 | 0.91 | 0.93 | 0.9 | 0.92 | 0.91 | 0.91 | 0.9 | 0.88 | 0.88 |
| 6 | Percentage elongation
after fracture for
machined test pieces,A,% | min. | 22 | -— | 20 | —— | —— | 12 | 12 | 10 | 9 | 8 |
| 7 | Percentage reduction of area after
fracture for machined test pieces,Z,% | min. | —— | 52 | 48 | 48 | 44 |
| 8 | Elongation after fracture for full-size
fasteners,Af | min. | —— | 0.24 | —— | 0.22 | 0.2 | —— | —— | —— | —— | —— |
| 9 | Head soundness | No fracture |
| 10 | Vickers hardness, HV,
F≥98N | min. | 120 | 130 | 155 | 160 | 190 | 250 | 255 | 290 | 320 | 385 |
| max. | 220g | 250 | 320 | 335 | 360 | 380 | 435 |
| 11 | Brinell hardness, HBW
,F=30D² | min. | 114 | 124 | 147 | 152 | 181 | 238 | 242 | 276 | 304 | 366 |
| max. | 209g | 238 | 304 | 318 | 342 | 361 | 414 |
| 12 | Rockwell hardness,HRB ,
HRB | min. | 67 | 71 | 79 | 82 | 89 | |
| max. | 95g | 99.5 | |
Rockwell hardness,
HRC | min. | —— | 22 | 23 | 28 | 32 | 39 |
| max. | —— | 32 | 34 | 37 | 39 | 44 |
| 13 | Surface hardness
HV 0.3 | max. | —— | h | h,j | h,j |
| 14 | Height of non-decarburized thread zone,E,mm | min. | —— | 1/2H1 | 2/3H1 | 3/4H1 |
Depth of complete decarburization in the
thread,G,mm | max. | —— | 0.015 |
| 15 | Reduction of hardness after retempering,HV | max. | —— | 20 |
| 16 | Breaking torque,
MB,N·m | min. | —— | in accordance with ISO 898-7 |
| 17 | Impact strength,
KVK,I,J | min. | —— | 27 | —— | 27 | 27 | 27 | 27 | m |
| 18 | Surface integrity in accordance with | ISO 6157-1n | ISO 6157-3 |
| a Values do not apply for structural bolting.
b For structural bolting d W M12.
c Nominal values are specified only for the purpose of the designation system for property classes.See Clause 5.
d In cases where the lower yield strength ReL cannot be determined, it is permissible to measure the stress at 0,2 % non-proportional elongation Rp0,2.
e For the property classes 4.8, 5.8 and 6.8 the values for Rpf min are under investigation. The present values are given for calculation of the proof stress ratio only. They are not test values.
f Proof loads are specified in Tables 5 and 7.
g Hardness determined at the end of a fastener shall be 250 HV, 238 HB or 99,5 HRB maximum.
h Surface hardness shall not be more than 30 Vickers points above the measured core hardness of the fastener when determination of both surface hardness and core hardness are carried out with HV 0,3.
i Any increase in hardness at the surface which indicates that the surface hardness exceeds 390 HV is not acceptable.
j Any increase in hardness at the surface which indicates that the surface hardness exceeds 435 HV is not acceptable.
k Values are determined at a test temperature of −20 °C, see 9.14.
l Applies to d W 16 mm. m Value for KV is under investigation.
n Instead of ISO 6157-1, ISO 6157-3 may apply by agreement between the manufacturer and the purchaser. |
Materials and Chemical compstition
1008
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu | Al |
| 0.06 | 0.06 | 0.33 | 0.013 | 0.003 | 0.01 | 0 | 0.01 | 0.028 |
1035
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.34 | 0.13 | 0.73 | 0.012 | 0.002 | 0.02 | 0.01 | 0.02 |
10B21
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | B |
| 0.2 | 0.04 | 0.81 | 0.017 | 0.007 | 0.017 | 0.0021 |
1045
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.45 | 0.23 | 0.58 | 0.014 | 0.006 | 0.057 | 0.008 | 0.016 |
40CR
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.4 | 0.21 | 0.54 | 0.015 | 0.008 | 0.95 | 0.02 | 0.02 |
35CRMO
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
| 0.35 | 0.22 | 0.59 | 0.01 | 0.003 | 0.93 | 0.01 | 0.01 | 0.21 |
42CRMO
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
| 0.42 | 0.27 | 0.92 | 0.013 | 0.004 | 1.01 | 0.03 | 0.04 | 0.2 |
Finish
PLAIN ZP YZP BLACK HDG DACROMET GEOMET CHROME NICKEL AND SO ON
PACKING
QBH BULK
20-25KG/CTN,36CTNS/PALLET
20-30KG/BAGS,36BAGS/PALLET
ONE TON/BOXES
50KG/ IRON DRUM,12 IRON DRUMS/PALLET
QBH SMALL PACKING
Packing in small boxes according to customer’s requirements
Packing in plastic bag according to customer’s requirements
QBH PALLET TYPE
SOLID WOOD FUMIGATION PALLET
EURO Pallet
THREE SPLINT PALLET
WOODEN BOX
The advantages of QBH
- QBH brand sales to the main quality assurance.
- Years of export trade management, excellent service, word-of-mouth guarantee.
- By working with TUV,escort for quality.
- Customization of non-standard parts can be made according to customer's requirements and drawings.
- For quality customers,we can provide a certain credit period.
FAQ
1. How do you let me trust you.
Jiaxing City Qunbang Hardware Co.,ltd hs its own right of import and export,QBH trademark in China,United States,European Union have been registered.At the same time,you can also check the registration information of our company in the China industry and Commerce system.
2. How about your price.
We will be based on different markets,for different quality and quantity,tailor-made prices for customers,in order to achieve win-win goal.
3. How do you control your quality.
Incoming quality contral( IQC)→Process Quality control(PQC)→Output quality control(OQC),and the random samples is sent to TUV for testing.If the customer received the goods and found quality problems,QBH company promises to be responsible for returning money or replenishing the goods
4. Could you provide free samples?
For new customer, We can provide free samples for standard fastener, But the clients will pay the express
charges. For old customer, We will send you free samples and pay express charges by ourself.
5. Do you accept small order?
QBH company can accept small orders if we have them in stock.Generally speaking,the stock probability of stainless steel fasteners is higher than that of carbon steel fasteners.
6. How about your delivery time
What we pursure is the high efficiency movement pattern,the stainless steel fastener delivery time about 15days,the carbon steel fastener will it about 30days
7. What is your packing.
Usually 25KG/carbon,36CTNS on the pallets,or 20-30kg/Bags,then on the pallet,QBH company personalized packagingis also available,like 10PCS/plastic bag or 10pcs/box,it can print some information
such as LOGO and pattern of customers.
8. What is your payment term
Normally,our terms of payment are TT and L/C,if we cooperate for a long time,we can reach the point of mutual trust,and fully support our customers to become bigger and stronger in the local market.
Not only in the price concessions,but also in the payment can also be made on credit,Specific credit sales time needs to be negotiated separately
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Hexagon Cup Head Bolt Long Square Neck Gal With ISO4032 HDG Finish Images
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