Snapper 3912 manual Hardware Identification & Torque Specifications

Hardware Identification & Torque Specifications

Common Hardware Types

Hex Head Capscrew	Washer
	Lockwasher
Carriage Bolt
	Hex Nut

Standard Hardware Sizing

When a washer or nut is identified as 1/2”, this is the Nominal size, meaning the inside diameter is 1/2 inch; if a second number is present it represent the threads per inch

When bolt or capscrew is identified as 1/2 - 16 x 2”, this means the Nominal size, or body diameter is 1/2 inch; the second number represents the threads per inch (16 in this example, and the final number is the body length of the bolt or screw (in this example 2 inches long).

The guides and ruler furnished below are designed to help you select the appropriate hardware and tools.

0
1/4	Nut, 1/2”
1/2	Inside
	Diameter
3/4
1
1/4
1/2
3/4	Screw, 1/2 x 2
2	Body
1/4	Diameter
1/2	Body
	Length
3/4
3
1/4
1/2
3/4
4

Torque Specification Chart

FOR STANDARD MACHINE HARDWARE (Tolerance ± 20%)

	Hardware		No
		Marks
	Grade	SAE Grade 2			SAE Grade 5		SAE Grade 8
	Size Of	in/lbs			in/lbs		in/lbs
	Hardware	ft/lbs		Nm.	ft/lbs	Nm.	ft/lbs		Nm.
8-32		19		2.1	30	3.4	41	4.6
8-36		20		2.3	31	3.5	43	4.9
10-24		27		3.1	43	4.9	60	6.8
10-32		31		3.5	49	5.5	68		7.7
1/4-20		66		7.6	8	10.9	12	16.3
1/4-28		76		8.6	10	13.6	14	19.0
5/16-18		11		15.0	17	23.1	25	34.0
5/16-24		12		16.3	19	25.8	27	34.0
3/8-16		20		27.2	30	40.8	45	61.2
3/8-24		23		31.3	35	47.6	50	68.0
7/16-14		30		40.8	50	68.0	70	95.2
7/16-20		35		47.6	55	74.8	80	108.8
1/2-13		50		68.0	75	102.0	110	149.6
1/2-20		55		74.8	90	122.4	120	163.2
9/16-12		65		88.4	110	149.6	150	204.0
9/16-18		75		102.0	120	163.2	170	231.2
5/8-11		90		122.4	150	204.0	220	299.2
5/8-18		100		136	180	244.8	240	326.4
3/4-10		160		217.6	260	353.6	386	525.0
3/4-16		180		244.8	300	408.0	420	571.2
7/8-9		140		190.4	400	544.0	600	816.0
7/8-14		155		210.8	440	598.4	660	897.6
1-8		220		299.2	580	788.8	900	1,244.0
1-12		240		326.4	640	870.4	1,000	1,360.0

NOTES

1.These torque values are to be used for all hardware excluding: locknuts, self-tapping screws, thread forming screws, sheet metal screws and socket head setscrews.

2.Recommended seating torque values for locknuts:

a.for prevailing torque locknuts - use 65% of grade 5 torques.

b.for flange whizlock nuts and screws - use 135% of grade 5 torques.

3.Unless otherwise noted on assembly drawings, all torque values must meet this specification.

Wrench & Fastener Size Guide

			7/16	1/2
		3/8		DIA.
1/4	5/16		DIA.
1/4” Bolt or Nut	5/16” Bolt or Nut	3/8” Bolt or Nut	7/16” Bolt or Nut	1/2” Bolt or Nut
Wrench—7/16”	Wrench—1/2”	Wrench—9/16”	Wrench (Bolt)—5/8”	Wrench—3/4”
			Wrench (Nut)—11/16”