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Euro DIN 15237 Elevator Bolts

Euro DIN 15237 elevator bolts have a concave head and two lugs on the underside to help prevent rotation when tightening. Popular throughout Europe for the last 30 years, this fastening system is intended for the attachment of pressed steel elevator buckets incorporating recessed bolt holes. The recessed area surrounding the bolt hole is intended to accommodate the similarly domed surface under the bolt head. Because of this domed area under the bolt head, these bolts are not recommended for flat back plastic buckets, especially on thinner belts.

Euro DIN 15237 Elevator Bolt

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Material:

Zinc Plated Steel or Stainless Steel (304)

Features:

• ISO Grade 5.8 Steel (Exceeds DIN 15237)

• Concave Head & 2 Lugs Help Prevent Rotation During Tightening

• POZIDRIV® Bolt Head Available for Steel Web Belts

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Size (mm)	Head Diameter Ø (mm)	Max. Torque (ft. lbs.) / (Nm)	Package Quantity	Package Weight (kg)
M6 x 20*	21	6 / 8	100	0.97
M6 x 25*	21	6 / 8	100	1.04
M6 x 30*	21	6 / 8	100	1.07
M7 x 20*	23	10 / 13	100	1.34
M7 x 25	23	10 / 13	100	1.47
M7 x 30	23	10 / 13	100	1.61
M7 x 35*	23	10 / 13	100	1.75
M8 x 20*	30	14 / 19	100	2.17
M8 x 25	30	14 / 19	100	2.26
M8 x 30	30	14 / 19	100	2.46
M8 x 35	30	14 / 19	100	2.59
M8 x 40	30	14 / 19	100	2.73
M8 x 45*	30	14 / 19	100	2.86
M8 x 50	30	14 / 19	100	2.98
M10 x 25*	35	28 / 38	100	3.76
M10 x 30	35	28 / 38	100	3.99
M10 x 35	35	28 / 38	100	4.20
M10 x 40	35	28 / 38	100	4.45
M10 x 45	35	28 / 38	100	4.74
M10 x 50	35	28 / 38	100	5.03
M12 x 40*	42	49 / 66	100	6.68
M12 x 50*	42	49 / 66	100	7.47
M12 x 60*	42	49 / 66	100	8.30
M12 x 70*	42	49 / 66	100	9.26

* Stainless Steel Not Available
- Not Recommended for Flat Back Plastic Elevator Buckets
- Installed Bolt Torque Rating Dependent on Bucket and Belt Size



			Elevator Bolt Hardware - Nuts, Washers & Spacers

			Along with the various types and sizes of elevator bolts, 4B offers
			all of the hardware required for each fastener.

			For more information on all elevator bolt hardware specifications,
			see page 44 of our full line catalog by clicking the link below.

			More Info


			Elevator Buckets 4B manufacturers plastic, steel and stainless steel elevator buckets and cups for agricultural and industrial applications. With over 400 different sizes and styles, 4B can supply the right product for your bucket elevator. More Info









			Elevator Belting Rubber, PVC and FDA food quality belts are available. Belts vary by style and include: anti-static, high temperature, oil resistant, and flame retardant types. More Info









			Elevator Belt Splices & Fasteners A range of mechanical splices and fasteners for use on most PVC, rubber and steel web elevator belts. More Info

How long of an elevator bolt do I need?

When installing buckets on an elevator belt, use this simple formula:

(belt thickness + bucket back thickness + washer thickness + nut thickness + 1/4 inch)

What grade are 4B elevator bolts?

4B elevator bolts meet or exceed SAE Grade 2 / ISO Grade 5.8 standards. The bolt grade guide below is for bolt

diameters of 1/4" (6 mm) to 1/2" (12 mm):

BOLT GRADE GUIDE
SAE Grade	ISO Grade	Min. Tensile Strength (psi)
2	5.8	74,000
5	8.8	120,000
8	10.9	150,000

What torque setting should I use?

An ideal installation will result in the elevator bolt head fitting snuggly just below the surface of the belt after tightening

(Image B). However, never exceed the maximum recommended torque as shown in the tables below:

MAXIMUM RECOMMENDED TORQUE FOR 4B ELEVATOR BOLTS SAE GRADE 2 OR 302 STAINLESS STEEL
Bolt Diameter	in. lbs.	ft. lbs.	Nm
1/4"	72	6	8
5/16"	156	13	18
3/8"	276	23	31
1/2"	684	57	77

MAXIMUM RECOMMENDED TORQUE FOR 4B ELEVATOR BOLTS METRIC ISO GRADE 5.8
Bolt Diameter	in. lbs.	ft. lbs.	Nm
M6	72	6	8
M7	115	10	13
M8	168	14	19
M10	336	28	38
M12	588	49	66

What if the tolerance on bolt length?

See table below for specific tolerances.

TOLERANCE ON BOLT LENGHT
Nominal Length	No. 10 thru 3/8"	7/16 and 1/2"	9/16" thru 3/4"	7/8" and 1"	1-1/8" thru 1-1/2"
Up to 1"	+0.02 -0.03	+0.02 -0.03	+0.02 -0.03	---- ----	---- ----
Over 1" to 2-1/2"	+0.02 -0.04	+0.04 -0.05	+0.06 -0.08	+0.08 -0.10	+0.12 -0.12
Over 2-1/2" to 4"	+0.04 -0.06	+0.06 -0.08	+0.08 -0.10	+0.10 -0.14	+0.16 -0.16
Over 4" to 6"	+0.06 -0.10	+0.08 -0.10	+0.10 -0.10	+0.12 -0.16	+0.18 -0.18
Over 6"	+0.10 -0.18	+0.12 -0.18	+0.14 -0.18	+0.16 -0.20	+0.22 -0.22

How do you install an elevator bolt?

The head of the elevator bolt should lie against the inside surface of the elevator belt with the nuts and washers on

the inside of the elevator bucket (Image A). An ideal installation will result in the elevator bolt head fitting snuggly

just below the surface of the elevator belt (Image B).

IMAGE A

IMAGE B

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My elevator bucket has recessed (curved) holes, can I use a flat washer?

Domed washers are recommended for recessed holes.

Can nylon threaded lock nuts (nylock) be used more than once?

It is not recommended to re-use nylock nuts. Also, if temperatures reach 250° F or higher, nylock nuts should not

be used.

How can I prevent stainless steel bolts and nuts from locking up (galling)?

Stainless steel fasteners are susceptible to freezing up or locking up (galling). During the tightening process, pressure

builds between the two contacting thread surfaces and breaks down the protective oxide coatings. Without the oxide

coating, there is an increase in friction between the threads which can generate enough heat to fuse the nut and bolt

together. The following actions can help prevent galling -

1 - Slow down installation RPM speed

2 - Use thread lubrication such as PTFE based coatings

3 - Use different stainless alloy grades for the bolt and nut

4 - Use regular hex nuts and lock washers instead of nylon insert lock nuts

Do you have any maintenance recommendations?

After initial installation, it is recommended that the bucket elevator be run for approximately four hours. After which the

bolts should be re-tightened to ensure that there are no loose parts. Periodic inspections are always recommended to

check for any issues that may occur during the life of the elevator, including checks for loose or damaged elevator bolts.

What is the maximum temperature for zinc plated bolts and nylon threaded lock nuts (nylock)?

Zinc plated bolts can be used on applications where the temperature is less than 390° F (200° C). Zinc plated nylon

threaded lock nuts (nylock) have a maximum service temperature of 250° F (120° C).









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	At 4B we have designed hundreds of bucket elevators for many different industries from animal feed, grain storage and processing, flour milling, malting and brewing through to biomass, cement, coal, frac sand and other heavy industries. We can provide preliminary design information for upgrading your existing elevator or help with designing a new elevator. Take advantage of 4B’s FREE worldwide technical support from a team of engineers specializing in the design of bucket elevators. Using your key technical data, our engineers will provide the preliminary design and component details so that your elevator performs as expected and achieves required capacities and discharge characteristics. To get a recommendation from our engineers, CLICK HERE to fill out our online form.

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